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* [Bug c++/87437] New: g++ ICE Segfault initializing implicitly sized array in template with enum index
@ 2018-09-25 23:16 james at albanarts dot com
0 siblings, 0 replies; only message in thread
From: james at albanarts dot com @ 2018-09-25 23:16 UTC (permalink / raw)
To: gcc-bugs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87437
Bug ID: 87437
Summary: g++ ICE Segfault initializing implicitly sized array
in template with enum index
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: james at albanarts dot com
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Build: x86_64-pc-linux-gnu
Created attachment 44751
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44751&action=edit
segfault.cpp - Really simple test case
I hit an internal compiler error in g++. Reduced test case attached and pasted
here:
enum E { ENUM };
template <typename T>
void foo()
{
int arr[] = { [ENUM] = 0 };
}
Compiled like this on Gentoo (sys-devel/gcc-7.3.0-r3):
$ g++ -c -o segfault.o segfault.cpp
segfault.cpp: In function ‘void foo()’:
segfault.cpp:6:27: internal compiler error: Segmentation fault
int arr[] = { [ENUM] = 0 };
^
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://bugs.gentoo.org/> for instructions.
It works if the template line is removed.
It works if ENUM is replaced with integer literal (i.e. "[0] = 0").
It works if an explicit size is given (i.e. "int arr[1]").
I'm not able to test on a newer version right now, but its a trivial test case,
maybe somebody else can check if its already fixed?
$ g++ -v
Using built-in specs.
COLLECT_GCC=/usr/x86_64-pc-linux-gnu/gcc-bin/7.3.0/g++
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-7.3.0-r3/work/gcc-7.3.0/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/7.3.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.3.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.3.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.3.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/include/g++-v7
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/7.3.0/python
--enable-languages=c,c++,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --enable-nls --without-included-gettext
--enable-checking=release --with-bugurl=https://bugs.gentoo.org/
--with-pkgversion='Gentoo 7.3.0-r3 p1.4' --disable-esp --enable-libstdcxx-time
--enable-shared --enable-threads=posix --enable-__cxa_atexit
--enable-clocale=gnu --enable-multilib --with-multilib-list=m32,m64
--disable-altivec --disable-fixed-point --enable-targets=all --disable-libgcj
--enable-libgomp --disable-libmudflap --disable-libssp --disable-libcilkrts
--disable-libmpx --enable-vtable-verify --enable-libvtv --enable-lto
--without-isl --enable-libsanitizer --enable-default-pie --enable-default-ssp
Thread model: posix
gcc version 7.3.0 (Gentoo 7.3.0-r3 p1.4)
>From gcc-bugs-return-616323-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Sep 25 23:16:03 2018
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87437] g++ ICE Segfault initializing implicitly sized array in template with enum index
Date: Wed, 26 Sep 2018 02:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87437
Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |mpolacek at gcc dot gnu.org
Resolution|--- |FIXED
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Fixed by
commit a463ca37a357dc17181918ceaf4294409c6e6d70
Author: jason <jason@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Thu Apr 5 19:43:39 2018 +0000
PR c++/85136 - ICE with designated init in template.
* decl.c (maybe_deduce_size_from_array_init): Handle dependent
designated initializer.
(check_array_designated_initializer): Update ce->index with the
constant value.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@259152
138bc75d-0d04-0410-961f-82ee72b054a4
>From gcc-bugs-return-616324-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 02:12:31 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/71625] missing strlen optimization on different array initialization style
Date: Wed, 26 Sep 2018 03:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71625
--- Comment #22 from Martin Sebor <msebor at gcc dot gnu.org> ---
The failures were discussed here:
https://gcc.gnu.org/ml/gcc-patches/2018-08/msg00863.html
I'm afraid I'm not at all familiar with the details of these tests or even
sufficiently versed in aarch64 assembly to change them as James suggested. I
also don't have ready access to an aarch64 machine to verify changes to them
(they are runtime tests and without ARM headers don't compile with a
cross-compiler). If what it takes to avoid the failures is to disable inlining
it should be easy enough to do but I have no way of validating the change.
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/87428] "Missed" inline instances cause bogus DWARF to be emitted
Date: Wed, 26 Sep 2018 07:05:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Sep 26 07:05:01 2018
New Revision: 264594
URL: https://gcc.gnu.org/viewcvs?rev=264594&root=gcc&view=rev
Log:
2018-09-26 Richard Biener <rguenther@suse.de>
PR debug/87428
PR debug/87362
* tree-inline.c (expand_call_inline): When the location
of the call is UNKNOWN_LOCATION use DECL_SOURCE_LOCATION
or BUILTINS_LOCATION for the BLOCK_SOURCE_LOCATION of
the inserted BLOCK to make inlined_function_outer_scope_p
recognize it.
* dwarf2out.c (add_call_src_coords_attributes): Do not add
coords for reserved locations.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/dwarf2out.c
trunk/gcc/tree-inline.c
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From: "me at zv dot io" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/87438] New: ICE building gfortran for MicroBlaze target
Date: Wed, 26 Sep 2018 07:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87438
Bug ID: 87438
Summary: ICE building gfortran for MicroBlaze target
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: me at zv dot io
Target Milestone: ---
Created attachment 44752
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44752&action=edit
Build log with -j1 for clarity.
Attempting to build GCC 8.2.0 with the following flags for the MicroBlaze
target:
--enable-languages=c,c++,fortran --disable-libquadmath
--disable-libquadmath-support --disable-decimal-float --disable-multilib
Results in the following ICE:
mv -f .deps/bessel_r4.Tpo .deps/bessel_r4.Plo
/bin/sh ./libtool --tag=CC --mode=compile
/kale/musl-cross-make/build/local/microblaze-linux-musl/obj_gcc/./gcc/xgcc
-B/kale/musl-cross-make/build/local/microblaze-linux-musl/obj_gcc/./gcc/
-B/microblaze-linux-musl/bin/ -B/microblaze-linux-musl/lib/ -isystem
/microblaze-linux-musl/include -isystem /microblaze-linux-musl/sys-include
--sysroot=/kale/musl-cross-make/build/local/microblaze-linux-musl/obj_sysroot
-fdebug-prefix-map=/kale/musl-cross-make/build/local/microblaze-linux-musl=
-DHAVE_CONFIG_H -I. -I../../../src_gcc/libgfortran
-iquote../../../src_gcc/libgfortran/io -I../../../src_gcc/libgfortran/../gcc
-I../../../src_gcc/libgfortran/../gcc/config -I../.././gcc
-I../../../src_gcc/libgfortran/../libgcc -I../libgcc
-I../../../src_gcc/libgfortran/../libbacktrace -I../libbacktrace
-I../libbacktrace -std=gnu11 -Wall -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition -Wextra -Wwrite-strings
-Werror=implicit-function-declaration -Werror=vla -fcx-fortran-rules
-ffunction-sections -fdata-sections -g -O2 -MT bessel_r8.lo -MD -MP -MF
.deps/bessel_r8.Tpo -c -o bessel_r8.lo `test -f
'../../../src_gcc/libgfortran/generated/bessel_r8.c' || echo
'../../../src_gcc/libgfortran/'`../../../src_gcc/libgfortran/generated/bessel_r8.c
libtool: compile:
/kale/musl-cross-make/build/local/microblaze-linux-musl/obj_gcc/./gcc/xgcc
-B/kale/musl-cross-make/build/local/microblaze-linux-musl/obj_gcc/./gcc/
-B/microblaze-linux-musl/bin/ -B/microblaze-linux-musl/lib/ -isystem
/microblaze-linux-musl/include -isystem /microblaze-linux-musl/sys-include
--sysroot=/kale/musl-cross-make/build/local/microblaze-linux-musl/obj_sysroot
-fdebug-prefix-map=/kale/musl-cross-make/build/local/microblaze-linux-musl=
-DHAVE_CONFIG_H -I. -I../../../src_gcc/libgfortran
-iquote../../../src_gcc/libgfortran/io -I../../../src_gcc/libgfortran/../gcc
-I../../../src_gcc/libgfortran/../gcc/config -I../.././gcc
-I../../../src_gcc/libgfortran/../libgcc -I../libgcc
-I../../../src_gcc/libgfortran/../libbacktrace -I../libbacktrace
-I../libbacktrace -std=gnu11 -Wall -Wstrict-prototypes -Wmissing-prototypes
-Wold-style-definition -Wextra -Wwrite-strings
-Werror=implicit-function-declaration -Werror=vla -fcx-fortran-rules
-ffunction-sections -fdata-sections -g -O2 -MT bessel_r8.lo -MD -MP -MF
.deps/bessel_r8.Tpo -c ../../../src_gcc/libgfortran/generated/bessel_r8.c
-fPIC -DPIC -o .libs/bessel_r8.o
during RTL pass: reload
../../../src_gcc/libgfortran/generated/bessel_r8.c: In function 'bessel_yn_r8':
../../../src_gcc/libgfortran/generated/bessel_r8.c:178:1: internal compiler
error: in gen_reg_rtx, at emit-rtl.c:1155
}
^
Please submit a full bug report,
with preprocessed source if appropriate.
Host compiler flags:
$ gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-foxkit-linux-musl/6.4.0/lto-wrapper
Target: x86_64-foxkit-linux-musl
Configured with: /usr/src/packages/system/gcc/src/gcc-6.4.0/configure
--prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info
--build=x86_64-foxkit-linux-musl --host=x86_64-foxkit-linux-musl
--target=x86_64-foxkit-linux-musl --with-pkgversion='Adelie 6.4.0'
--with-bugurl=http://bts.adelielinux.org/ --enable-checking=release
--disable-fixed-point --disable-libstdcxx-pch --disable-multilib
--disable-werror --disable-symvers --enable-__cxa_atexit --enable-default-pie
--enable-cloog-backend --enable-languages=c,c++,objc,java,go,fortran
--disable-libmpx --disable-libmudflap --disable-libsanitizer --enable-shared
--enable-threads --enable-tls --with-system-zlib --with-linker-hash-style=gnu
Thread model: posix
gcc version 6.4.0 (Adelie 6.4.0)
Intermediate compiler flags:
$ ./xgcc -v
Using built-in specs.
COLLECT_GCC=./xgcc
Target: microblaze-linux-musl
Configured with: ../src_gcc/configure --enable-languages=c,c++ CC='gcc -static
--static' CXX='g++ -static --static' FC='gfortran -static --static' CFLAGS='-g0
-Os' CXXFLAGS='-g0 -Os' FFLAGS='-g0 -Os' LDFLAGS='-s -static --static'
--disable-nls MAKEINFO=/bin/false
--with-debug-prefix-map=/kale/musl-cross-make/build/local/microblaze-linux-musl=
--enable-languages=c,c++,fortran --disable-libquadmath
--disable-libquadmath-support --disable-decimal-float --disable-multilib
--disable-werror --target=microblaze-linux-musl --prefix= --libdir=/lib
--disable-multilib --with-sysroot=/microblaze-linux-musl --enable-tls
--disable-libmudflap --disable-libsanitizer --disable-gnu-indirect-function
--disable-libmpx --enable-deterministic-archives --enable-libstdcxx-time
--with-build-sysroot=/kale/musl-cross-make/build/local/microblaze-linux-musl/obj_sysroot
AR_FOR_TARGET=/kale/musl-cross-make/build/local/microblaze-linux-musl/obj_binutils/binutils/ar
AS_FOR_TARGET=/kale/musl-cross-make/build/local/microblaze-linux-musl/obj_binutils/gas/as-new
LD_FOR_TARGET=/kale/musl-cross-make/build/local/microblaze-linux-musl/obj_binutils/ld/ld-new
NM_FOR_TARGET=/kale/musl-cross-make/build/local/microblaze-linux-musl/obj_binutils/binutils/nm-new
OBJCOPY_FOR_TARGET=/kale/musl-cross-make/build/local/microblaze-linux-musl/obj_binutils/binutils/objcopy
OBJDUMP_FOR_TARGET=/kale/musl-cross-make/build/local/microblaze-linux-musl/obj_binutils/binutils/objdump
RANLIB_FOR_TARGET=/kale/musl-cross-make/build/local/microblaze-linux-musl/obj_binutils/binutils/ranlib
READELF_FOR_TARGET=/kale/musl-cross-make/build/local/microblaze-linux-musl/obj_binutils/binutils/readelf
STRIP_FOR_TARGET=/kale/musl-cross-make/build/local/microblaze-linux-musl/obj_binutils/binutils/strip-new
Thread model: posix
gcc version 8.2.0 (GCC)
The full build log (-j1) is attached.
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/87362] GCC produces with LTO debug info with which gdb is not happy about
Date: Wed, 26 Sep 2018 07:34:00 -0000
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--- Comment #17 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Sep 26 07:05:01 2018
New Revision: 264594
URL: https://gcc.gnu.org/viewcvs?rev=264594&root=gcc&view=rev
Log:
2018-09-26 Richard Biener <rguenther@suse.de>
PR debug/87428
PR debug/87362
* tree-inline.c (expand_call_inline): When the location
of the call is UNKNOWN_LOCATION use DECL_SOURCE_LOCATION
or BUILTINS_LOCATION for the BLOCK_SOURCE_LOCATION of
the inserted BLOCK to make inlined_function_outer_scope_p
recognize it.
* dwarf2out.c (add_call_src_coords_attributes): Do not add
coords for reserved locations.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/dwarf2out.c
trunk/gcc/tree-inline.c
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Subject: [Bug ada/81878] --disable-bootstrap --enable-languagesa fails
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--- Comment #31 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
> It seems that some paths are properly translated though, for example the library paths. Do you know why? It would be nice to have the gnatlink command line that gave rise to the invocation quoted in the dump screen.
Full build log is here
https://mistuke.blob.core.windows.net/binaries/logs/build.log
from that it looks like the command preceding it is
../../gnatbind -I../rts -I.
-IE:/msys64-2.6.0/home/Tamar/MINGW-packages/mingw-w64-gcc/src/gcc-8.2.0/gcc/ada
-I- -I../rts -I.
-IE:/msys64-2.6.0/home/Tamar/MINGW-packages/mingw-w64-gcc/src/gcc-8.2.0/gcc/ada
-static -x -x
E:\msys64-2.6.0\home\Tamar\MINGW-packages\mingw-w64-gcc\src\build-x86_64-w64-mingw32\gcc\ada\tools\gnatclean.ali^M
../../gnatlink -v gnatcmd -o ../../gnat.exe \
--GCC="../../xgcc -B../../ -I- -I../rts -I.
-I/home/Tamar/MINGW-packages/mingw-w64-gcc/src/gcc-8.2.0/gcc/ada"
--LINK="/home/Tamar/MINGW-packages/mingw-w64-gcc/src/build-x86_64-w64-mingw32/./gcc/xg++
-B/home/Tamar/MINGW-packages/mingw-w64-gcc/src/build-x86_64-w64-mingw32/./gcc/
-nostdinc++ -nostdinc++
-I/home/Tamar/MINGW-packages/mingw-w64-gcc/src/build-x86_64-w64-mingw32/x86_64-w64-mingw32/libstdc++-v3/include/x86_64-w64-mingw32
-I/home/Tamar/MINGW-packages/mingw-w64-gcc/src/build-x86_64-w64-mingw32/x86_64-w64-mingw32/libstdc++-v3/include
-I/home/Tamar/MINGW-packages/mingw-w64-gcc/src/gcc-8.2.0/libstdc++-v3/libsupc++
-I/home/Tamar/MINGW-packages/mingw-w64-gcc/src/gcc-8.2.0/libstdc++-v3/include/backward
-I/home/Tamar/MINGW-packages/mingw-w64-gcc/src/gcc-8.2.0/libstdc++-v3/testsuite/util
-L/home/Tamar/MINGW-packages/mingw-w64-gcc/src/build-x86_64-w64-mingw32/x86_64-w64-mingw32/libstdc++-v3/src
-L/home/Tamar/MINGW-packages/mingw-w64-gcc/src/build-x86_64-w64-mingw32/x86_64-w64-mingw32/libstdc++-v3/src/.libs
-L/home/Tamar/MINGW-packages/mingw-w64-gcc/src/build-x86_64-w64-mingw32/x86_64-w64-mingw32/libstdc++-v3/libsupc++/.libs
-B/home/Tamar/MINGW-packages/mingw-w64-gcc/src/build-x86_64-w64-mingw32/x86_64-w64-mingw32/libstdc++-v3/src/.libs
-B/home/Tamar/MINGW-packages/mingw-w64-gcc/src/build-x86_64-w64-mingw32/x86_64-w64-mingw32/libstdc++-v3/libsupc++/.libs
-L/mingw64/x86_64-w64-mingw32/lib -L/mingw64/lib -isystem
/mingw64/x86_64-w64-mingw32/include -isystem /mingw64/include
-B/mingw64/x86_64-w64-mingw32/bin/ -B/mingw64/x86_64-w64-mingw32/lib/ -isystem
/mingw64/x86_64-w64-mingw32/include -isystem
/mingw64/x86_64-w64-mingw32/sys-include -static-libstdc++ -static-libgcc
-static-libstdc++ -static-libgcc " ../link.o ../targext.o ../../ggc-none.o
../../libcommon-target.a ../../libcommon.a ../../../libcpp/libcpp.a
../rts/libgnat.a /mingw64/lib/libiconv.a
../../../libbacktrace/.libs/libbacktrace.a ../../../libiberty/libiberty.a
-no-pie
It may be the quoting around the options for --LINK that's causing the shell
not to convert the paths. The unquoted ones are fine.
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Subject: [Bug ada/81878] --disable-bootstrap --enable-languagesa fails
Date: Wed, 26 Sep 2018 08:41:00 -0000
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--- Comment #32 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> Full build log is here
> https://mistuke.blob.core.windows.net/binaries/logs/build.log
Thanks.
> It may be the quoting around the options for --LINK that's causing the shell
> not to convert the paths. The unquoted ones are fine.
Do you know whether it would be possible to force the conversion by applying
some trick to GCC_LINK in ada/gcc-interface/Makefile.in?
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Subject: [Bug ada/81878] --disable-bootstrap --enable-languagesa fails
Date: Wed, 26 Sep 2018 09:03:00 -0000
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--- Comment #33 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
> Do you know whether it would be possible to force the conversion by applying some trick to GCC_LINK in ada/gcc-interface/Makefile.in?
Yeah usually, cygpath -w would convert a path, seems we alias that to
`fix_srcfile_path` in the gcc build system and use that often. I don't think
that works in this case because the string contains more than just a path.
But I think I may have a workaround, I'll give it a try tonight once I'm back
at the Windows machine.
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Subject: [Bug middle-end/63155] [6/7/8 Regression] memory hog
Date: Wed, 26 Sep 2018 09:09:00 -0000
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--- Comment #34 from David <david at pgmasters dot net> ---
My primary concern in 87316 was about memory usage and this patch definitely
helps a lot with that. Thanks!
Using -ftree-coalesce-vars helps on >= 4.9 versions and does not seem to have
an adverse effect on test coverage.
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Subject: [Bug c++/67656] [concepts] matched variadics in expression constraint report as unmatched
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--- Comment #1 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Wed Sep 26 09:08:24 2018
New Revision: 264596
URL: https://gcc.gnu.org/viewcvs?rev=264596&root=gcc&view=rev
Log:
2018-09-26 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/67656
* g++.dg/concepts/pr67656.C: New.
Added:
trunk/gcc/testsuite/g++.dg/concepts/pr67656.C
Modified:
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/67656] [concepts] matched variadics in expression constraint report as unmatched
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |8.0
--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed in 8.1.0
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Subject: [Bug c++/67491] [meta-bug] concepts issues
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Bug 67491 depends on bug 67656, which changed state.
Bug 67656 Summary: [concepts] matched variadics in expression constraint report as unmatched
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67656
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
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From: "ro at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87439] New: [9 regression] ICE in ix86_mode_needed, at config/i386/i386.c:18907
Date: Wed, 26 Sep 2018 09:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87439
Bug ID: 87439
Summary: [9 regression] ICE in ix86_mode_needed, at
config/i386/i386.c:18907
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: ro at gcc dot gnu.org
CC: ubizjak at gmail dot com
Target Milestone: ---
Host: i386-pc-solaris2.11
Target: i386-pc-solaris2.11
Build: i386-pc-solaris2.11
Between 20180924 (r264536) and 20180925 (r264580), two testcases started to
FAIL
on 32-bit Solaris/x86:
+FAIL: gcc.target/i386/avx-vzeroupper-16.c (internal compiler error)
+FAIL: gcc.target/i386/avx-vzeroupper-16.c (test for excess errors)
+UNRESOLVED: gcc.target/i386/avx-vzeroupper-16.c scan-assembler-times
avx_vzeroupper 1
+FAIL: gcc.target/i386/avx-vzeroupper-17.c (internal compiler error)
+FAIL: gcc.target/i386/avx-vzeroupper-17.c (test for excess errors)
+UNRESOLVED: gcc.target/i386/avx-vzeroupper-17.c scan-assembler-times
avx_vzeroupper 1
Excess errors:
during RTL pass: vzeroupper
/vol/gcc/src/hg/trunk/local/gcc/testsuite/gcc.target/i386/avx-vzeroupper-16.c:14:1:
internal compiler error: in ix86_mode_needed, at config/i386/i386.c:18907
0x9372f22 ix86_mode_needed
/vol/gcc/src/hg/trunk/local/gcc/config/i386/i386.c:18907
0x992c83f optimize_mode_switching
/vol/gcc/src/hg/trunk/local/gcc/mode-switching.c:604
0x992c83f execute
/vol/gcc/src/hg/trunk/local/gcc/mode-switching.c:892
0x8ef162a gcc::pass_manager::execute_pass_mode_switching()
/vol/gcc/src/hg/trunk/local/gcc/passes.c:126
0x935b949 rest_of_handle_insert_vzeroupper
/vol/gcc/src/hg/trunk/local/gcc/config/i386/i386.c:888
0x935b949 execute
/vol/gcc/src/hg/trunk/local/gcc/config/i386/i386.c:2508
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Subject: [Bug target/87439] [9 regression] ICE in ix86_mode_needed, at config/i386/i386.c:18907
Date: Wed, 26 Sep 2018 09:13:00 -0000
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Rainer Orth <ro at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.0
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From: "aldyh at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87415] [9 Regression] wrong code at -O1 and above on x86_64-linux-gnu
Date: Wed, 26 Sep 2018 09:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87415
--- Comment #3 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Created attachment 44753
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44753&action=edit
untested patch
1-bit signed fields are weird in that 0 - (-MIN) is still -MIN. In any other
world, it is an impossible result. For instance, in an 8-bit signed world, 0 -
(-128) is invalid.
One option would be to treat signed bit fields as TYPE_OVERFLOW wraps, since
they seem to have wrapping properties, but I'm afraid such a heavy handed
approach would yield latent bugs across the compiler. What VRP seems to
currently be doing in set_and_canonicalize_value_range(), is just special
casing the wrapping of 1-bit fields:
/* Wrong order for min and max, to swap them and the VR type we need
to adjust them. */
if (tree_int_cst_lt (max, min))
{
tree one, tmp;
/* For one bit precision if max < min, then the swapped
range covers all values, so for VR_RANGE it is varying and
for VR_ANTI_RANGE empty range, so drop to varying as well. */
if (TYPE_PRECISION (TREE_TYPE (min)) == 1)
{
set_value_range_to_varying (vr);
return;
}
...
}
I've done the same in set_value_range_with_overflow(). The attached untested
patch fixes the problem on my end.
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From: "paolo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/67655] [concepts] expression constraints and variadic expansions
Date: Wed, 26 Sep 2018 09:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67655
--- Comment #1 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Wed Sep 26 09:23:00 2018
New Revision: 264638
URL: https://gcc.gnu.org/viewcvs?rev=264638&root=gcc&view=rev
Log:
2018-09-26 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/67655
* g++.dg/concepts/pr67655.C: New.
Added:
trunk/gcc/testsuite/g++.dg/concepts/pr67655.C
Modified:
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/67655] [concepts] expression constraints and variadic expansions
Date: Wed, 26 Sep 2018 09:25:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |8.0
--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed in 8.1.0.
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/67491] [meta-bug] concepts issues
Date: Wed, 26 Sep 2018 09:27:00 -0000
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Bug 67491 depends on bug 67655, which changed state.
Bug 67655 Summary: [concepts] expression constraints and variadic expansions
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67655
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87436] [6/7/8/9 Regression] G++ produces >300MB .rodata section to initialize struct with big array
Date: Wed, 26 Sep 2018 09:30:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-26
Known to work| |4.8.5
Version|5.4.0 |8.2.1
Target Milestone|--- |6.5
Summary|G++ produces >300MB .rodata |[6/7/8/9 Regression] G++
|section to initialize |produces >300MB .rodata
|struct with big array |section to initialize
| |struct with big array
Ever confirmed|0 |1
Known to fail| |8.2.1
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed with GCC 8. I think the issue is that FooGrid::FooGrid _is_
constexpr as can be seen in dumps:
;; Function constexpr FooGrid::FooGrid() (null)
;; enabled by -tree-original
{
<<cleanup_point <<< Unknown tree: expr_stmt
(void) (((struct FooGrid *) this)->arr = <<< Unknown tree: vec_init_expr
D.2204
>>>) >>>>>;
}
and that we lower this VEC_INIT_EXPR to just
FooGrid::FooGrid (struct FooGrid * const this)
{
this->arr = *.LC0;
}
GCC 4.8 compiles this instantanously.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87439] [9 regression] ICE in ix86_mode_needed, at config/i386/i386.c:18907
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87439
Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-09-26
Assignee|unassigned at gcc dot gnu.org |ubizjak at gmail dot com
Ever confirmed|0 |1
--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
Following patch should fix the problem:
--cut here--
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index b68fc801718..f96f864b810 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -2499,7 +2499,7 @@ enum avx_u128_state
#define NUM_MODES_FOR_MODE_SWITCHING \
{ X86_DIRFLAG_ANY, AVX_U128_ANY, \
- I387_CW_ANY, I387_CW_ANY, I387_CW_ANY, I387_CW_ANY }
+ I387_CW_ANY, I387_CW_ANY, I387_CW_ANY }
/* Avoid renaming of stack registers, as doing so in combination with
--cut here--
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Subject: [Bug debug/87428] "Missed" inline instances cause bogus DWARF to be emitted
Date: Wed, 26 Sep 2018 09:39:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk.
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Subject: [Bug c++/71130] [concepts] Ill-formed code declaring a variable with a non-type concept not rejected
Date: Wed, 26 Sep 2018 09:40:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed in trunk.
*** This bug has been marked as a duplicate of bug 85065 ***
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Subject: [Bug c++/85065] [concepts] ICE with invalid use of a concept
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
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----------------------------------------------------------------------------
CC| |tom at honermann dot net
--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> ---
*** Bug 71130 has been marked as a duplicate of this bug. ***
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Subject: [Bug debug/87362] GCC produces with LTO debug info with which gdb is not happy about
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Bug 87362 depends on bug 87428, which changed state.
Bug 87428 Summary: "Missed" inline instances cause bogus DWARF to be emitted
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87428
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
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Subject: [Bug c++/71126] [concepts] ICE on ill-formed code declaring a variable with a non-type concept
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
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--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed in trunk.
*** This bug has been marked as a duplicate of bug 85065 ***
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Subject: [Bug c++/67491] [meta-bug] concepts issues
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
Bug 67491 depends on bug 71130, which changed state.
Bug 71130 Summary: [concepts] Ill-formed code declaring a variable with a non-type concept not rejected
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71130
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
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Subject: [Bug c++/67491] [meta-bug] concepts issues
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Bug 67491 depends on bug 71126, which changed state.
Bug 71126 Summary: [concepts] ICE on ill-formed code declaring a variable with a non-type concept
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71126
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Subject: [Bug c++/85065] [concepts] ICE with invalid use of a concept
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--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
*** Bug 71126 has been marked as a duplicate of this bug. ***
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug debug/87440] New: GCC creates debug that confuses gdb
Date: Wed, 26 Sep 2018 09:58:00 -0000
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Bug ID: 87440
Summary: GCC creates debug that confuses gdb
Product: gcc
Version: 8.2.1
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Priority: P3
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static int foo (int i)
{
volatile int j = i + 3;
return j - 2;
}
int main()
{
volatile int z = foo (-1);
return z;
}
> gcc t.c -O -g
> gdb ./a,out
(gdb) start
(gdb) s
foo (i=-1) at t.c:7
7 {
(gdb) info locals
j = 0
j = <optimized out>
we get 'j' two times (this is with gdb 8.2) because we emit a stray lexical
block for the DW_TAG_inlined_subroutine:
<2><128>: Abbrev Number: 4 (DW_TAG_inlined_subroutine)
<129> DW_AT_abstract_origin: <0x170>
<12d> DW_AT_low_pc : 0x4004d7
<135> DW_AT_high_pc : 0xf
<13d> DW_AT_call_file : 1
<13e> DW_AT_call_line : 8
<3><13f>: Abbrev Number: 5 (DW_TAG_formal_parameter)
<140> DW_AT_abstract_origin: <0x17c>
<144> DW_AT_location : 0x0 (location list)
<3><148>: Abbrev Number: 6 (DW_TAG_lexical_block)
<149> DW_AT_low_pc : 0x4004d7
<151> DW_AT_high_pc : 0xf
<4><159>: Abbrev Number: 7 (DW_TAG_variable)
<15a> DW_AT_abstract_origin: <0x185>
<15e> DW_AT_location : 2 byte block: 91 70 (DW_OP_fbreg: -16)
vs. the abstract origin which has:
<1><170>: Abbrev Number: 10 (DW_TAG_subprogram)
<171> DW_AT_name : foo
<175> DW_AT_decl_file : 1
<176> DW_AT_decl_line : 1
<177> DW_AT_prototyped : 1
<177> DW_AT_type : <0x164>
<17b> DW_AT_inline : 1 (inlined)
<2><17c>: Abbrev Number: 11 (DW_TAG_formal_parameter)
<17d> DW_AT_name : i
<17f> DW_AT_decl_file : 1
<180> DW_AT_decl_line : 1
<181> DW_AT_type : <0x164>
<2><185>: Abbrev Number: 12 (DW_TAG_variable)
<186> DW_AT_name : j
<188> DW_AT_decl_file : 1
<189> DW_AT_decl_line : 3
<18a> DW_AT_type : <0x16b>
note how there's no outermost lexical block there.
This is because gen_subprogram_die calls decls_for_scope on DECL_INITIAL
rather than gen_lexical_block_die. gen_inlined_subroutine_die tries to do
the same but fails to merge the "fake" block the inliner generates for
the parameter replacements with the actual outer scope of the function.
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-09-26
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
We seem to never got this right, GCC 3.4 did
(gdb) info locals
j = 2
i = <optimized out>
j = <optimized out>
z = 0
eh.
I have a patch.
>From gcc-bugs-return-616353-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 10:01:16 2018
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Subject: [Bug c++/71127] [concepts] ICE on ill-formed code declaring a variable with a template concept
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--- Comment #1 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Wed Sep 26 09:59:56 2018
New Revision: 264639
URL: https://gcc.gnu.org/viewcvs?rev=264639&root=gcc&view=rev
Log:
2018-09-26 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/71131
* g++.dg/concepts/pr71131.C: New.
2018-09-26 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/71127
* g++.dg/concepts/pr71127.C: New.
Added:
trunk/gcc/testsuite/g++.dg/concepts/pr71127.C
trunk/gcc/testsuite/g++.dg/concepts/pr71131.C
Modified:
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-616357-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 10:02:08 2018
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Subject: [Bug c++/67491] [meta-bug] concepts issues
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
Bug 67491 depends on bug 71127, which changed state.
Bug 71127 Summary: [concepts] ICE on ill-formed code declaring a variable with a template concept
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71127
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
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Subject: [Bug c++/71131] [concepts] Ill-formed code declaring a variable with a template concept not rejected
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed in trunk.
*** This bug has been marked as a duplicate of bug 85065 ***
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Subject: [Bug c++/67491] [meta-bug] concepts issues
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Bug 67491 depends on bug 71131, which changed state.
Bug 71131 Summary: [concepts] Ill-formed code declaring a variable with a template concept not rejected
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71131
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
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Subject: [Bug c++/71131] [concepts] Ill-formed code declaring a variable with a template concept not rejected
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--- Comment #1 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Wed Sep 26 09:59:56 2018
New Revision: 264639
URL: https://gcc.gnu.org/viewcvs?rev=264639&root=gcc&view=rev
Log:
2018-09-26 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/71131
* g++.dg/concepts/pr71131.C: New.
2018-09-26 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/71127
* g++.dg/concepts/pr71127.C: New.
Added:
trunk/gcc/testsuite/g++.dg/concepts/pr71127.C
trunk/gcc/testsuite/g++.dg/concepts/pr71131.C
Modified:
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/85065] [concepts] ICE with invalid use of a concept
Date: Wed, 26 Sep 2018 10:02:00 -0000
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--- Comment #6 from Paolo Carlini <paolo.carlini at oracle dot com> ---
*** Bug 71127 has been marked as a duplicate of this bug. ***
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Subject: [Bug c++/71127] [concepts] ICE on ill-formed code declaring a variable with a template concept
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed in trunk.
*** This bug has been marked as a duplicate of bug 85065 ***
>From gcc-bugs-return-616359-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 10:02:50 2018
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/85065] [concepts] ICE with invalid use of a concept
Date: Wed, 26 Sep 2018 10:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85065
--- Comment #7 from Paolo Carlini <paolo.carlini at oracle dot com> ---
*** Bug 71131 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-616361-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 10:12:30 2018
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/67970] [concepts] variable template bug
Date: Wed, 26 Sep 2018 10:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67970
Paolo Carlini <paolo.carlini at oracle dot com> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
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--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed a while ago, in 6.2.0.
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/67491] [meta-bug] concepts issues
Date: Wed, 26 Sep 2018 10:13:00 -0000
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Bug 67491 depends on bug 67970, which changed state.
Bug 67970 Summary: [concepts] variable template bug
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67970
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>From gcc-bugs-return-616363-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 10:13:36 2018
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From: "harald at gigawatt dot nl" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/77314] Allows C++11 POD types in anonymous structures.
Date: Wed, 26 Sep 2018 10:20:00 -0000
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--- Comment #2 from Harald van Dijk <harald at gigawatt dot nl> ---
(In reply to Harald van Dijk from comment #1)
> A workaround for current GCC versions is to use an array of size 1.
That, by the way, shows an existing code generation problem:
struct S { S(); };
struct T { struct { S s[1]; }; } t;
does not call S's constructor when compiled with GCC, but does call it when
compiled with clang. In my opinion, this should be accepted as an extension and
call the constructor. Similarly, if GCC is changed to accept
struct S { S(); };
struct T { struct { S s; }; } t;
it should also call the constructor. And errors should be generated for
struct S { S(); };
union U { struct { S s; }; } u;
and
struct S { S(); };
union U { struct { S s[1]; }; } u; // currently accepted
while
struct S { S(); };
union U { struct { S s; }; } *pu;
should be okay.
>From gcc-bugs-return-616365-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 10:30:31 2018
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Subject: [Bug c++/68437] [concepts] fold expression, pack expansion, and deduced constraint requirement
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
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--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed long time ago, in 6.2.0.
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Subject: [Bug c++/68510] [concepts] ICE: in gimplify_var_or_parm_decl, at gimplify.c:1827
Date: Wed, 26 Sep 2018 10:30:00 -0000
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--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Can't reproduce with the active branches or the released 6.1.0 for that matter.
Marek, can you double check?
>From gcc-bugs-return-616366-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 10:30:32 2018
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Subject: [Bug c++/67491] [meta-bug] concepts issues
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Bug 67491 depends on bug 68437, which changed state.
Bug 68437 Summary: [concepts] fold expression, pack expansion, and deduced constraint requirement
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68437
What |Removed |Added
----------------------------------------------------------------------------
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Resolution|--- |FIXED
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Subject: [Bug c++/77314] Allows C++11 POD types in anonymous structures.
Date: Wed, 26 Sep 2018 11:01:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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Subject: [Bug debug/87440] GCC creates debug that confuses gdb
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 44754
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44754&action=edit
not working patch
Simply merging the single subblock of an inline block runs afoul several
issues:
- dead block removal can make it multiple subblocks (the assert in the patch
fires)
- dead block removal can make us elide "real" scopes which isn't a problem for
live variables but it will hide optimized out ones.
So one could call the block eliding premature optimization... but it's
somewhat hardwired as we do not emit begin/end labels for that block.
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Subject: [Bug c++/87441] New: Found compiler internal error: in tsubst at cp/pt.c:13657
Date: Wed, 26 Sep 2018 11:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87441
Bug ID: 87441
Summary: Found compiler internal error: in tsubst at
cp/pt.c:13657
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: auttasak.lapapirojn at hotmail dot com
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Created attachment 44755
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44755&action=edit
Source file that causes the problem.
--------------------------------------------------------------------------------
-- Error messages
--------------------------------------------------------------------------------
18:09:55$ g++ -fconcepts main.cpp
main.cpp:19:11: internal compiler error: in tsubst, at cp/pt.c:13657
void proc(HasBinaryAdd x, HasBinaryAdd y)
^~~~~~~~~~~~
Please submit a full bug report,
with preprocessed source if appropriate.
See <file:///usr/share/doc/gcc-7/README.Bugs> for instructions.
--------------------------------------------------------------------------------
-- Compiler info
--------------------------------------------------------------------------------
17:46:04$ g++ -v
Using built-in specs.
COLLECT_GCC=g++
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu 7.3.0-16ubuntu3'
--with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --with-as=/usr/bin/x86_64-linux-gnu-as
--with-ld=/usr/bin/x86_64-linux-gnu-ld --program-suffix=-7
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --enable-default-pie
--with-system-zlib --with-target-system-zlib --enable-objc-gc=auto
--enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 7.3.0 (Ubuntu 7.3.0-16ubuntu3)
>From gcc-bugs-return-616370-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 11:19:18 2018
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From: "cdenizet at mozilla dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug gcov-profile/87442] New: Add options to filter files we want to instrument for code coverage
Date: Wed, 26 Sep 2018 11:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87442
Bug ID: 87442
Summary: Add options to filter files we want to instrument for
code coverage
Product: gcc
Version: unknown
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The idea is to add two options to easily include/exclude some files from being
instrumented.
Here are two use cases:
1) -coverage-exclude=/usr/include/*: typically we remove the data for such
files when post-processing the gcno/gcda so we don't need to instrument them
and so we could reduce the overhead due to instrumentation.
2) -coverage-filter=.*/foo.cpp:.*/bar.cpp: here we want to only instrument
these two files (for example, to display code coverage data for files appearing
in a patch at review phase)
These options could take regular expressions separated by colon to give more
flexibility in the choice of the files.
When the user is using both options only the files which match a regex in
filter and don't match all of the regex in exclude are instrumented.
I already proposed such a feature for clang:
https://reviews.llvm.org/D52033
https://reviews.llvm.org/D52034
It would be nice to have the same feature for gcc (if it doesn't exist off
course) with the same option names.
What do you think ?
>From gcc-bugs-return-616371-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 11:39:27 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/87443] New: GCC mixes abstract and concrete instances in abstract origins for inlines
Date: Wed, 26 Sep 2018 11:43:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87443
Bug ID: 87443
Summary: GCC mixes abstract and concrete instances in abstract
origins for inlines
Product: gcc
Version: 8.2.1
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For
int foo (int i)
{
{
volatile int j = i + 3;
return j - 2;
}
}
int main()
{
volatile int z = foo (-1);
return z;
}
we create
<2><12a>: Abbrev Number: 4 (DW_TAG_inlined_subroutine)
<12b> DW_AT_abstract_origin: <0x177>
<12f> DW_AT_low_pc : 0x4004e1
<137> DW_AT_high_pc : 0xf
<13f> DW_AT_call_file : 1
<140> DW_AT_call_line : 10
<141> DW_AT_call_column : 20
<3><142>: Abbrev Number: 5 (DW_TAG_formal_parameter)
<143> DW_AT_abstract_origin: <0x188>
<147> DW_AT_location : 0x0 (location list)
<3><14b>: Abbrev Number: 6 (DW_TAG_lexical_block)
<14c> DW_AT_abstract_origin: <0x1bf>
<150> DW_AT_low_pc : 0x4004e1
<158> DW_AT_high_pc : 0xf
<4><160>: Abbrev Number: 7 (DW_TAG_variable)
<161> DW_AT_abstract_origin: <0x193>
<165> DW_AT_location : 2 byte block: 91 70 (DW_OP_fbreg: -16)
<4><168>: Abbrev Number: 0
<3><169>: Abbrev Number: 0
...
<1><19f>: Abbrev Number: 14 (DW_TAG_subprogram)
<1a0> DW_AT_abstract_origin: <0x177>
<1a4> DW_AT_low_pc : 0x4004d2
<1ac> DW_AT_high_pc : 0xf
<1b4> DW_AT_frame_base : 1 byte block: 9c (DW_OP_call_frame_cfa)
<1b6> DW_AT_GNU_all_call_sites: 1
<2><1b6>: Abbrev Number: 5 (DW_TAG_formal_parameter)
<1b7> DW_AT_abstract_origin: <0x188>
<1bb> DW_AT_location : 0x25 (location list)
<2><1bf>: Abbrev Number: 15 (DW_TAG_lexical_block)
<1c0> DW_AT_low_pc : 0x4004d2
<1c8> DW_AT_high_pc : 0xe
<3><1d0>: Abbrev Number: 7 (DW_TAG_variable)
<1d1> DW_AT_abstract_origin: <0x193>
<1d5> DW_AT_location : 2 byte block: 91 74 (DW_OP_fbreg: -12)
<3><1d8>: Abbrev Number: 0
note how the DW_TAG_inlined_subroutine abstract origin points to the
abstract instance (likewise the formal parameter) but the DW_AT_lexcial_block
and points to the concrete instance. Note how the concrete instance
fails to point to the abstract instance for its DW_AT_lexical_block.
I fixed that for the DW_TAG_variable (GCC 7 is still broken) so a similar
fix is probably needed for DW_TAG_lexical_block ...
>From gcc-bugs-return-616372-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 11:43:32 2018
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Subject: [Bug debug/87443] GCC mixes abstract and concrete instances in abstract origins for inlines
Date: Wed, 26 Sep 2018 11:44:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-09-26
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Created attachment 44756
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44756&action=edit
patch I am testing
Patch for both issues. We shouldn't equate the BLOCK to concrete instance DIEs
we create. And we should attach abstract origins to the concrete instance
BLOCKs (origin == stmt, see set_decl_origin_self - which I hoped to get rid of
at some point).
Slightly nicer solution would be to go for TREE_DIE_REF in DECL_ABSTRACT_ORIGIN
refering to the abstract DIEs we created for a decl. I'll give that a try
anyways.
>From gcc-bugs-return-616373-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 11:44:42 2018
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Subject: [Bug gcov-profile/87442] Add options to filter files we want to instrument for code coverage
Date: Wed, 26 Sep 2018 11:46:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
In general, I like the idea and I understand your motivation to reduce the
overhead. I can probably work on that, but I'm not promising to deliver that to
GCC 9.1.
>From gcc-bugs-return-616374-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 11:46:40 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/81715] asan-stack=1 redzone allocation is too inflexible
Date: Wed, 26 Sep 2018 11:58:00 -0000
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--- Comment #34 from Martin Liška <marxin at gcc dot gnu.org> ---
For the next version of the patch:
https://gcc.gnu.org/ml/gcc-patches/2018-09/msg01529.html
I seen even better results:
TOTAL warnings: 23
drivers/net/wireless/ralink/rt2x00/rt2800lib.c:5653:1: 11800
drivers/net/wireless/ralink/rt2x00/rt2800lib.c:4518:1: 6352
lib/atomic64_test.c:250:1: 5640
drivers/net/wireless/ralink/rt2x00/rt2800lib.c:3882:1: 4256
drivers/net/wireless/ralink/rt2x00/rt2500pci.c:1047:1: 3888
drivers/net/wireless/ralink/rt2x00/rt73usb.c:1294:1: 3720
mm/vmscan.c:1497:1: 3408
drivers/net/wireless/ralink/rt2x00/rt61pci.c:1647:1: 2928
drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c:16563:1: 2816
lib/atomic64_test.c:148:1: 2656
drivers/scsi/fnic/fnic_trace.c:451:1: 2624
drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c:16905:1: 2552
net/sched/cls_flower.c:1286:1: 2376
fs/btrfs/relocation.c:1149:1: 2352
drivers/acpi/nfit/core.c:3213:1: 2304
net/core/ethtool.c:2872:1: 2272
fs/jbd2/commit.c:1129:1: 2192
fs/ocfs2/namei.c:1691:1: 2120
drivers/net/wireless/ralink/rt2x00/rt2400pci.c:909:1: 2096
drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c:26034:1: 2080
drivers/iio/common/ssp_sensors/ssp_spi.c:449:1: 2064
drivers/media/dvb-frontends/stv0910.c:1547:1: 2064
drivers/net/wireless/ralink/rt2x00/rt61pci.c:1963:1: 2064
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Subject: [Bug c/87347] ICE in warn_for_abs at gcc/c/c-parser.c:9226 since r264368
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--- Comment #4 from Martin Jambor <jamborm at gcc dot gnu.org> ---
Author: jamborm
Date: Wed Sep 26 11:58:18 2018
New Revision: 264640
URL: https://gcc.gnu.org/viewcvs?rev=264640&root=gcc&view=rev
Log:
[PR 87347] Prevent segfaults if TYPE_ARG_TYPES is NULL
2018-09-26 Martin Jambor <mjambor@suse.cz>
PR c/87347
c/
* c-parser.c (warn_for_abs): Bail out if TYPE_ARG_TYPES is NULL. Fix
comment.
testsuite/
* gcc.dg/pr87347.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr87347.c
Modified:
trunk/gcc/c/ChangeLog
trunk/gcc/c/c-parser.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-616376-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 12:01:11 2018
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Subject: [Bug c/87347] ICE in warn_for_abs at gcc/c/c-parser.c:9226 since r264368
Date: Wed, 26 Sep 2018 12:10:00 -0000
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Martin Jambor <jamborm at gcc dot gnu.org> changed:
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--- Comment #5 from Martin Jambor <jamborm at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-616377-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 12:10:22 2018
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From: "vincent-gcc at vinc17 dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Wed, 26 Sep 2018 12:36:00 -0000
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--- Comment #4 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to joseph@codesourcery.com from comment #3)
> I believe this is correct for C99 (see the discussions in bug 82071): [...]
Bug 82071 has no discussions. The main reference is N1531, which one can find
at: http://www.open-std.org/jtc1/sc22/wg14/www/docs/n1531.pdf
but this is actually a clarification of potentially ambiguous text in C99. C99
6.3.1.8p2 says: "The values of floating operands and of the results of floating
expressions may be represented in greater precision and range than that
required by the type; the types are not changed thereby." Thus, in the example,
even though one has an implicit conversion of unsigned long long to double, the
result may be represented in greater precision, and this is where
FLT_EVAL_METHOD is taken into account.
Note that there is an error in N1531, which says "6.3.1.8 (Usual arithmetic
conversions) refers to conversions of operands of a floating type to another
floating type." This is wrong! 6.3.1.8 also covers integer types; it actually
uses the term "real type", and C99 defines it as "The integer and real floating
types are collectively called real types." i.e. this includes integer types.
There must have been a confusion by the authors of N1531.
Then, the issue is whether 6.3.1.8 covers semantic types or evaluation types
when considering the values. Considering the semantic types would defeat the
purpose of the possibility to have an intermediate greater precision. Indeed,
consider a, b and c of type double, and the floating-point expression
(a + b) + c
The result of a + b has semantic type double, like c. Using 6.3.1.8p1
"Otherwise, if the corresponding real type of either operand is double, the
other operand is converted, without change of type domain, to a type whose
corresponding real type is double.", the result of a + b would have to be
converted to double, thus removing the extra precision and range.
In short, either you should always do the conversion of the value to the
semantic type for each implicit conversion (though this is clearly not the
intent), or you should do the conversion to the evaluation type. But be
consistent.
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Subject: [Bug gcov-profile/87442] Add options to filter files we want to instrument for code coverage
Date: Wed, 26 Sep 2018 12:46:00 -0000
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calixte <cdenizet at mozilla dot com> changed:
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CC| |mcastelluccio at mozilla dot com,
| |sylvestre at debian dot org
--- Comment #2 from calixte <cdenizet at mozilla dot com> ---
About the name of the options -coverage-exclude & -coverage-filter, I took my
inspiration from the gcovr (-gcov-exclude & -gcov-filter):
https://manpages.debian.org/jessie/gcovr/gcovr.1.en.html
@martin, are you ok with that or do you have other ideas ?
>From gcc-bugs-return-616379-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 12:46:12 2018
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Subject: [Bug gcov-profile/87442] Add options to filter files we want to instrument for code coverage
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Well, in case of GCC, the option can be also used for -fprofile-{generate,use}
in order to train and optimize just part of a program. I like names 'filter'
and 'exclude', so maybe -fprofile-files-filter and -fprofile-files-exclude.
I would like to ask Honza (profile use maintainer) what he's thinking about it?
>From gcc-bugs-return-616380-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 12:54:16 2018
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Subject: [Bug tree-optimization/58774] tree-switch-conversion doesn't optimize with content in default scase
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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CC| |marxin at gcc dot gnu.org
Known to work| |8.2.0, 9.0
Resolution|--- |FIXED
--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed on trunk in r247538, which means Jakub JelÃnek should be given $100.
Closing as fixed.
>From gcc-bugs-return-616381-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 12:57:00 2018
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From: "ro at CeBiTec dot Uni-Bielefeld.DE" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87439] [9 regression] ICE in ix86_mode_needed, at config/i386/i386.c:18907
Date: Wed, 26 Sep 2018 13:50:00 -0000
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--- Comment #2 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
> Following patch should fix the problem:
[...]
It did indeed: bootstrapped without regressions on i386-pc-solaris2.11.
Thanks.
Rainer
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Subject: [Bug other/87444] New: 'gcc -marc=native' sets L2 cache size equal to L3 cache size on i7 and i5 CPU
Date: Wed, 26 Sep 2018 13:56:00 -0000
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Bug ID: 87444
Summary: 'gcc -marc=native' sets L2 cache size equal to L3
cache size on i7 and i5 CPU
Product: gcc
Version: 7.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
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STR:
gcc -### -march=native /usr/include/stdlib.h
lscpu | grep -i cache
OS: openSUSE Leap 15.0
EXPECTED:
gcc's output should show --param "l2-cache-size=<the same L2 cache which lscpu
shows>"
ACTUAL:
gcc outputs:
... --param "l2-cache-size=8192" ...
[~]: lscpu | grep -i cache
L1d cache: 32K
L1i cache: 32K
L2 cache: 256K
L3 cache: 8192K
The architecture is properly detected (ivybridge) but it seems l2-cache-size
equals the L3 cache, which is incorrect. The CPU model is "Intel(R) Core(TM)
i7-3770 CPU @ 3.40GHz"
A fellow openSUSE Leap 15.0 user shared that the same happens on "Intel(R)
Core(TM) i5-3210M CPU @ 2.50GHz" but not on AMD.
My own test on other machines shows that on "Intel(R) Xeon(TM) CPU 2.80GHz"
(nocona) and on "Intel(R) Celeron(R) M processor 1.50GHz" (pentium-m)
l2-cache-size is detected correctly. The nocona is running openSUSE Leap 15.0
and the pentium-m is running openSUSE Tumbleweed (32 bit).
>From gcc-bugs-return-616383-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 13:56:56 2018
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Subject: [Bug other/87444] 'gcc -marc=native' sets L2 cache size equal to L3 cache size on i7 and i5 CPU
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--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
This is by design.
A comment in driver-i386.c says:
/* Let the L3 replace the L2. This assumes inclusive caches
and single threaded program for now. */
if (level3.sizekb)
level2 = level3;
>From gcc-bugs-return-616384-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 14:06:11 2018
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Subject: [Bug other/87444] 'gcc -marc=native' sets L2 cache size equal to L3 cache size on i7 and i5 CPU
Date: Wed, 26 Sep 2018 14:11:00 -0000
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--- Comment #2 from George <studio at anchev dot net> ---
Forgive me, I am not a developer and I am not aware how this was designed. But
may I ask: why was it designed to be wrong and why only on particular CPUs?
Also: what happens when a wrong l2-cache-size is used? Won't that casue issues
with the final binary? (e.g. instability, crashing, I don't know...)
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Subject: [Bug target/87444] 'gcc -marc=native' sets L2 cache size equal to L3 cache size on i7 and i5 CPU
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |x86_64-*-*, i?86-*-*
Status|UNCONFIRMED |RESOLVED
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
cache size only drives heuristics. Currently there's no L3 cache heuristics.
Probably the --param should be renamed to last-level-cache.
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Subject: [Bug lto/87434] LTO corrupts code
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
+ rtx new_mem = gen_rtx_MEM (GET_MODE (mem), derived_ptr_reg);
+ MEM_COPY_ATTRIBUTES (new_mem, mem);
I think it's dangerous to use old MEMs attributes this way, esp. MEM_EXPR
and friends. You might also run into existing issues with RTL alias analysis
(find-baseterm and friends, just search bugzilla)
Obviously LTO has nothing to do with this, you are simply "unlucky".
>From gcc-bugs-return-616387-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 14:26:47 2018
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Subject: [Bug target/87444] 'gcc -marc=native' sets L2 cache size equal to L3 cache size on i7 and i5 CPU
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--- Comment #4 from George <studio at anchev dot net> ---
Richard Biener,
Thanks for the reply. Unfortunately I don't understand what it means - whether
I should set explicitly the correct l2-cache-size or if that has any effect on
the final binary.
But I realise this may not be the place for questions. In which particular
mailing list may I get reply to my question please?
>From gcc-bugs-return-616388-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 14:31:32 2018
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Subject: [Bug libstdc++/59439] std::locale uses atomic instructions on construction
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Attachment #31405|0 |1
is obsolete| |
--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Created attachment 44757
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44757&action=edit
Better benchmark.
This fixes a couple of bugs in the benchmark and simplifies it so the overhead
of dynamically allocating std::thread objects and adding them to a vector is
not measured.
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Subject: [Bug lto/87434] LTO corrupts code
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--- Comment #2 from kelvin at gcc dot gnu.org ---
Thanks for this suggestion. I'll investigate further.
(My intent was to advise the compiler that this new memory address expression
computes the same memory location as the original memory address expression. I
am thinking this is important to facilitate CSE and aliasing analysis.)
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Subject: [Bug debug/87443] GCC mixes abstract and concrete instances in abstract origins for inlines
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk.
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Wed Sep 26 14:35:48 2018
New Revision: 264643
URL: https://gcc.gnu.org/viewcvs?rev=264643&root=gcc&view=rev
Log:
2018-09-26 Richard Biener <rguenther@suse.de>
PR debug/87443
* dwarf2out.c (gen_lexical_block_die): Do not equate inline
or concrete instance DIE to the tree. Create abstract origin
attributes also for concrete instances.
* gcc.dg/debug/dwarf2/inline5.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/debug/dwarf2/inline5.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/dwarf2out.c
trunk/gcc/testsuite/ChangeLog
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--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Using current trunk and -O2 to compile the benchmark in comment 8 I get:
snprintf
1 threads took 11 ms
2 threads took 6 ms
3 threads took 6 ms
4 threads took 7 ms
5 threads took 15 ms
6 threads took 16 ms
7 threads took 16 ms
8 threads took 16 ms
9 threads took 19 ms
10 threads took 23 ms
11 threads took 25 ms
12 threads took 24 ms
13 threads took 30 ms
14 threads took 28 ms
15 threads took 30 ms
16 threads took 32 ms
17 threads took 35 ms
18 threads took 37 ms
19 threads took 40 ms
20 threads took 41 ms
21 threads took 43 ms
22 threads took 44 ms
23 threads took 48 ms
24 threads took 49 ms
25 threads took 51 ms
26 threads took 56 ms
27 threads took 58 ms
28 threads took 56 ms
29 threads took 58 ms
30 threads took 62 ms
31 threads took 62 ms
iostream
1 threads took 35 ms
2 threads took 87 ms
3 threads took 130 ms
4 threads took 176 ms
5 threads took 217 ms
6 threads took 243 ms
7 threads took 282 ms
8 threads took 322 ms
9 threads took 365 ms
10 threads took 404 ms
11 threads took 446 ms
12 threads took 481 ms
13 threads took 517 ms
14 threads took 557 ms
15 threads took 595 ms
16 threads took 638 ms
17 threads took 680 ms
18 threads took 717 ms
19 threads took 759 ms
20 threads took 796 ms
21 threads took 831 ms
22 threads took 872 ms
23 threads took 917 ms
24 threads took 954 ms
25 threads took 994 ms
26 threads took 1032 ms
27 threads took 1071 ms
28 threads took 1115 ms
29 threads took 1150 ms
30 threads took 1186 ms
31 threads took 1229 ms
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Subject: [Bug libstdc++/59439] std::locale uses atomic instructions on construction
Date: Wed, 26 Sep 2018 14:56:00 -0000
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--- Comment #10 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I have a patch that gets that down to:
snprintf
1 threads took 7 ms
2 threads took 7 ms
3 threads took 7 ms
4 threads took 7 ms
5 threads took 15 ms
6 threads took 16 ms
7 threads took 16 ms
8 threads took 16 ms
9 threads took 21 ms
10 threads took 22 ms
11 threads took 28 ms
12 threads took 23 ms
13 threads took 30 ms
14 threads took 30 ms
15 threads took 32 ms
16 threads took 32 ms
17 threads took 35 ms
18 threads took 38 ms
19 threads took 41 ms
20 threads took 40 ms
21 threads took 44 ms
22 threads took 48 ms
23 threads took 49 ms
24 threads took 50 ms
25 threads took 51 ms
26 threads took 54 ms
27 threads took 54 ms
28 threads took 56 ms
29 threads took 59 ms
30 threads took 60 ms
31 threads took 63 ms
iostream
1 threads took 29 ms
2 threads took 30 ms
3 threads took 31 ms
4 threads took 31 ms
5 threads took 59 ms
6 threads took 63 ms
7 threads took 64 ms
8 threads took 64 ms
9 threads took 82 ms
10 threads took 83 ms
11 threads took 99 ms
12 threads took 105 ms
13 threads took 112 ms
14 threads took 118 ms
15 threads took 123 ms
16 threads took 132 ms
17 threads took 140 ms
18 threads took 148 ms
19 threads took 162 ms
20 threads took 164 ms
21 threads took 174 ms
22 threads took 182 ms
23 threads took 194 ms
24 threads took 196 ms
25 threads took 210 ms
26 threads took 209 ms
27 threads took 220 ms
28 threads took 226 ms
29 threads took 234 ms
30 threads took 243 ms
31 threads took 252 ms
That's for 8 HT cores on Intel(R) Core(TM) i7-6700 CPU @ 3.40GHz
For 4 HT cores on Intel(R) Core(TM) i7-3520M CPU @ 2.90GHz the improvement is a
lot less impressive, going from current trunk's:
snprintf
1 threads took 17 ms
2 threads took 15 ms
...
31 threads took 186 ms
iostream
1 threads took 52 ms
2 threads took 105 ms
31 threads took 1430 ms
to:
snprintf
1 threads took 15 ms
2 threads took 12 ms
...
31 threads took 168 ms
iostream
1 threads took 47 ms
2 threads took 48 ms
...
31 threads took 675 ms
But that's still a significant improvement.
I'll finish testing and post to the mailing list.
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Subject: [Bug target/87439] [9 regression] ICE in ix86_mode_needed, at config/i386/i386.c:18907
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--- Comment #3 from uros at gcc dot gnu.org ---
Author: uros
Date: Wed Sep 26 14:55:59 2018
New Revision: 264645
URL: https://gcc.gnu.org/viewcvs?rev=264645&root=gcc&view=rev
Log:
PR target/87439
* config/i386/i386.h (NUM_MODES_FOR_MODE_SWITCHING): Update
for removed I387_MASK_PM entity.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.h
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Subject: [Bug target/71278] Inline nearbyint for SSE4.1
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--- Comment #1 from Uroš Bizjak <ubizjak at gmail dot com> ---
Author: uros
Date: Tue Sep 25 14:26:11 2018
New Revision: 264571
URL: https://gcc.gnu.org/viewcvs?rev=264571&root=gcc&view=rev
Log:
PR target/71278
* config/i386/i386.md (frndintxf2_mask_pm): Remove.
(frndintxf2_mask_pm_i387): Ditto.
(nearbyintxf2): Rewrite expander pattern to match rintxf2.
Enable for !flag_trapping_math.
(nearbyint<mode>2): Enable x87 modes for !flag_trapping_math.
Enable SSE modes for TARGET_SSE4_1 and expand them with round insn.
Change operand 1 predicate to nonimmediate_operand.
(attr "i387_cw"): Remove mask_pm.
* config/i386/i386.h (enum ix86_stack_slot): Remove SLOT_CW_MASK_PM.
(enum ix86_entity): Remove I387_MASK_PM.
* config/i386/i386.c (ix86_i387_mode_needed): Do not
handle I387_MASK_PM.
(ix86_mode_needed): Ditto.
(ix86_mode_after): Ditto.
(ix86_mode_entry): Ditto.
(ix86_mode_exit): Ditto.
(emit_i387_cw_initialization): Do not handle I387_CW_MASK_PM.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.c
trunk/gcc/config/i386/i386.h
trunk/gcc/config/i386/i386.md
trunk/gcc/reg-stack.c
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Subject: [Bug libstdc++/59439] std::locale uses atomic instructions on construction
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Patch posted to https://gcc.gnu.org/ml/gcc-patches/2018-09/msg01577.html
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Subject: [Bug target/71278] Inline nearbyint for SSE4.1
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Uroš Bizjak <ubizjak at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
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Target Milestone|--- |9.0
--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> ---
Fixed for gcc-9.
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Subject: [Bug fortran/64120] [F03] Wrong handling of allocatable character string
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--- Comment #9 from Paul Thomas <pault at gcc dot gnu.org> ---
(In reply to Francois-Xavier Coudert from comment #0)
> The following code shows allocatable character does not work as it should:
>
> call g(1)
> contains
> subroutine g(x)
> integer :: x
> character(len=x), allocatable :: s
> allocate(s)
> write(*,*) x, len(s)
> end subroutine
> end
>
>
> It should output "1 1" but outputs "1 0". The tree dump shows that the
> argument x is never used in the string allocation.
>
>
> A longer testcase, including SAVE (which seems also mishandled, but it is
> probably linked to this issue):
>
> program test
> logical :: L
> L = g(1)
> write(*,*) L
> L = g(2)
> write(*,*) L
> contains
> logical function g(x)
> integer :: x
> character(len=x), allocatable :: s
> save
> if(.NOT.allocated(s)) then
> allocate(s)
> g = .FALSE.
> else
> g = .TRUE.
> end if
> write(*,*) len(s)
> end function g
> end
What is the expected result in the second case? That both the allocation and
the string length be saved? Or should the string length be updated to 'x' with
every call? At the moment, the latter is implemented but the former would be no
problem.
Paul
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Subject: [Bug c++/87441] [concepts] Found compiler internal error: in tsubst at cp/pt.c:13657
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-26
CC| |mpolacek at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Confirmed with -fconcepts with trunk.
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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Wed, 26 Sep 2018 17:02:00 -0000
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--- Comment #5 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
It's 6.3.1.4 for conversions between real floating and integer types that,
in C99 but not C11, I think requires the resulting value to be
representable in the resulting real floating type.
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87414] -mindirect-branch=thunk produces thunk with incorrect CFI on x86_64
Date: Wed, 26 Sep 2018 18:45:00 -0000
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Wed Sep 26 17:00:49 2018
New Revision: 264651
URL: https://gcc.gnu.org/viewcvs?rev=264651&root=gcc&view=rev
Log:
PR target/87414
* config/i386/i386.c: Include debug.h and dwarf2out.h.
(output_indirect_thunk): Emit DW_CFA_def_cfa_offset after the
call.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.c
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From: "vincent-gcc at vinc17 dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Wed, 26 Sep 2018 19:33:00 -0000
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--- Comment #6 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to joseph@codesourcery.com from comment #5)
> It's 6.3.1.4 for conversions between real floating and integer types that,
> in C99 but not C11, I think requires the resulting value to be
> representable in the resulting real floating type.
No, it just requires the value to be in the range of values that can be
represented (which is always the case in practice, even though the C standard
does not forbid very long integers). Anyway, this is unrelated to the use of
extra precision and range.
Note that:
* 6.3.1.4 is about the behavior of conversion between real floating and
integer, for given types.
* 6.3.1.5 is about the behavior of conversion between real floating types, for
given types.
* 6.3.1.8 is about the selection of the arithmetic types (implicit
conversions).
Neither 6.3.1.4, nor 6.3.1.5 deals with semantic vs evaluation type (6.3.1.5
mentions "greater precision and range than required by its semantic type", but
*only* for the other direction, in an *explicit* conversion). It is 6.3.1.8
that deals with the rules about extra precision and range.
BTW, note 52 of 6.3.1.8 says "The cast and assignment operators are still
required to perform their specified conversions as described in 6.3.1.4 and
6.3.1.5." i.e. mentioning both 6.3.1.4 and 6.3.1.5, thus confirming that
implicit conversions of integer to real floating is also covered by the extra
precision and range (otherwise referencing 6.3.1.4 would be pointless). That
is, if d has type double,
d + (1ULL << 63)
and
d + (double) (1ULL << 63)
are handled differently.
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87445] New: missing null test optimization for a pointer member
Date: Wed, 26 Sep 2018 19:36:00 -0000
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Bug ID: 87445
Summary: missing null test optimization for a pointer member
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
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Because f() is declared nonnull, GCC successfully eliminates the unnecessary
null pointer test in function g below. However, it fails to perform the same
simplification in function h().
I noticed this after adding attribute nonnull to a few GCC functions in tree.h
didn't have the effect on the emitted object code that I expected. For
example, in something as simple as the following, GCC doesn't eliminate the
unnecessary test:
extern HOST_WIDE_INT tree_to_shwi (const_tree) ATTRIBUTE_NONNULL (1);
HOST_WIDE_INT foobar (tree t)
{
HOST_WIDE_INT x = tree_to_shwi (TYPE_SIZE (t));
if (!TYPE_SIZE (t))
__builtin_abort ();
return x;
}
$ cat t.c && gcc -O2 -S -Wall -fdump-tree-optimized=/dev/stdout t.c
__attribute__ ((nonnull)) int f (void*);
struct S { void *p; };
int g (void *p)
{
int i = f (p);
if (!p) // folded to false
__builtin_abort (); // eliminated
return i;
}
int h (struct S *p)
{
int i = f (p->p);
if (!p->p) // not folded but could be
__builtin_abort (); // not eliminated
return i;
}
;; Function g (g, funcdef_no=0, decl_uid=1910, cgraph_uid=1, symbol_order=0)
g (void * p)
{
int i;
<bb 2> [local count: 1073741824]:
i_4 = f (p_2(D)); [tail call]
return i_4;
}
;; Function h (h, funcdef_no=1, decl_uid=1914, cgraph_uid=2, symbol_order=1)
h (struct S * p)
{
int i;
void * _1;
void * _2;
<bb 2> [local count: 1073741824]:
_1 = p_4(D)->p;
i_6 = f (_1);
_2 = p_4(D)->p;
if (_2 == 0B)
goto <bb 3>; [0.00%]
else
goto <bb 4>; [99.96%]
<bb 3> [count: 0]:
__builtin_abort ();
<bb 4> [local count: 1073312328]:
return i_6;
}
>From gcc-bugs-return-616404-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 19:36:55 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87445] missing null test optimization for a pointer member
Date: Wed, 26 Sep 2018 19:43:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Martin Sebor <msebor at gcc dot gnu.org> ---
Never mind, I keep forgetting that GCC assumes that in the p->p case the
nonnull function can clobber the value of the first p. Adding attribute pure
to the called function lets it optimize the check away.
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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Wed, 26 Sep 2018 20:35:00 -0000
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--- Comment #7 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Wed, 26 Sep 2018, vincent-gcc at vinc17 dot net wrote:
> > It's 6.3.1.4 for conversions between real floating and integer types that,
> > in C99 but not C11, I think requires the resulting value to be
> > representable in the resulting real floating type.
>
> No, it just requires the value to be in the range of values that can be
> represented (which is always the case in practice, even though the C standard
> does not forbid very long integers). Anyway, this is unrelated to the use of
> extra precision and range.
It's the "If the value being converted is in the range of values that can
be represented but cannot be represented exactly" bit I'm concerned with,
in the absence of anything there in C99 (as opposed to in C11) to allow
for a wider evaluation format to be used for that purpose - together with
the cast operand being integer, not floating-point (see the notes on
ambiguous issues in
<https://gcc.gnu.org/ml/gcc-patches/2008-11/msg00105.html>).
> * 6.3.1.5 is about the behavior of conversion between real floating types, for
> given types.
(As clarified in C99 TC3 for DR#318.)
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From: "vincent-gcc at vinc17 dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Wed, 26 Sep 2018 20:42:00 -0000
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--- Comment #8 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to joseph@codesourcery.com from comment #7)
> It's the "If the value being converted is in the range of values that can
> be represented but cannot be represented exactly" bit I'm concerned with,
Note that 6.3.1.5 has the same thing for floating type to floating type.
>From gcc-bugs-return-616407-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 20:42:16 2018
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Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87390
--- Comment #9 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Wed, 26 Sep 2018, vincent-gcc at vinc17 dot net wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87390
>
> --- Comment #8 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
> (In reply to joseph@codesourcery.com from comment #7)
> > It's the "If the value being converted is in the range of values that can
> > be represented but cannot be represented exactly" bit I'm concerned with,
>
> Note that 6.3.1.5 has the same thing for floating type to floating type.
6.3.1.5 in C99 has a clear division between promotions (no change to
value) and demotions + explicit conversions (remove excess precision).
(DR#318 / TC3 dealt with the case where explicit conversion from float to
double acts like a demotion because the float was represented in long
double format.)
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Subject: [Bug libstdc++/51785] gets not anymore declared
Date: Wed, 26 Sep 2018 21:14:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |WAITING
--- Comment #30 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Is there anything still broken in supported releases? (i.e. gcc-6 or later)
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Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Wed, 26 Sep 2018 21:17:00 -0000
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--- Comment #10 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
Author: jsm28
Date: Wed Sep 26 21:14:16 2018
New Revision: 264656
URL: https://gcc.gnu.org/viewcvs?rev=264656&root=gcc&view=rev
Log:
Support excess precision for integer / floating-point comparisons (PR c/87390).
In C11, implicit conversions from integer to floating-point types
produce results with the range and precision of the corresponding
evaluation format rather than only those of the type implicitly
converted to. This patch implements that case of C11 excess precision
semantics in the case of a comparison between integer and
floating-point types, previously missed when implementing other cases
of excess precision for such implicit conversions. As with other such
fixes, this patch conservatively follows the reading of C99 where
conversions from integer to floating-point do not produce results with
excess precision and so the change is made for C11 mode only.
Bootstrapped with no regressions on x86_64-pc-linux-gnu.
gcc/c:
PR c/87390
* c-typeck.c (build_binary_op): Use excess precision for
comparisons of integers and floating-point for C11 and later.
gcc/testsuite:
PR c/87390
* gcc.target/i386/excess-precision-9.c,
gcc.target/i386/excess-precision-10.c: New tests.
Added:
trunk/gcc/testsuite/gcc.target/i386/excess-precision-10.c
trunk/gcc/testsuite/gcc.target/i386/excess-precision-9.c
Modified:
trunk/gcc/c/ChangeLog
trunk/gcc/c/c-typeck.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Wed, 26 Sep 2018 21:18:00 -0000
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Joseph S. Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #11 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
Fixed for GCC 9 to behave as you expect with -std=c11 (and deliberately not for
-std=c99, keeping existing behavior in that case).
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Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Wed, 26 Sep 2018 21:26:00 -0000
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Vincent Lefèvre <vincent-gcc at vinc17 dot net> changed:
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----------------------------------------------------------------------------
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--- Comment #12 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to joseph@codesourcery.com from comment #9)
> 6.3.1.5 in C99 has a clear division between promotions (no change to
> value) and demotions + explicit conversions (remove excess precision).
But there are no differences with 6.3.1.4 (when converting to a floating type):
in both cases, either the value can be represented exactly, in which case it is
unchanged, or it cannot, in which case it is rounded. When doing a conversion
to some given type, the C standard does not care of the origin type of the
value.
In any case, this is orthogonal to the rules given by 6.3.1.8 (which cover
extra precision and range).
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Wed, 26 Sep 2018 21:35:00 -0000
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--- Comment #13 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Wed, 26 Sep 2018, vincent-gcc at vinc17 dot net wrote:
> But there are no differences with 6.3.1.4 (when converting to a floating type):
> in both cases, either the value can be represented exactly, in which case it is
> unchanged, or it cannot, in which case it is rounded. When doing a conversion
> to some given type, the C standard does not care of the origin type of the
> value.
In 6.3.1.5 in C99, that distinction is only applied in the case of
demotions and explicit conversions (second paragraph); it does not apply
in the first paragraph (implicit promotions). I.e., the 6.3.1.4 handling
of conversions from integer to floating-point is analogous to the 6.3.1.5
second paragraph handling of demotions and explicit conversions from
floating-point to floating-point (not to the first paragraph handling of
implicit promotions).
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From: "vincent-gcc at vinc17 dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Wed, 26 Sep 2018 21:41:00 -0000
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--- Comment #14 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to joseph@codesourcery.com from comment #13)
> On Wed, 26 Sep 2018, vincent-gcc at vinc17 dot net wrote:
>
> > But there are no differences with 6.3.1.4 (when converting to a floating type):
> > in both cases, either the value can be represented exactly, in which case it is
> > unchanged, or it cannot, in which case it is rounded. When doing a conversion
> > to some given type, the C standard does not care of the origin type of the
> > value.
>
> In 6.3.1.5 in C99, that distinction is only applied in the case of
which distinction?
> demotions and explicit conversions (second paragraph); it does not apply
> in the first paragraph (implicit promotions). I.e., the 6.3.1.4 handling
> of conversions from integer to floating-point is analogous to the 6.3.1.5
> second paragraph handling of demotions and explicit conversions from
> floating-point to floating-point (not to the first paragraph handling of
> implicit promotions).
Analogous? Where does the C standard say that?
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Wed, 26 Sep 2018 21:47:00 -0000
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--- Comment #15 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
Note also that 6.3.1.5p2 occurs in case of explicit conversions or function
calls, not in typical floating-point expressions, in which types can be
promoted, but never demoted. So, I don't see really what you mean.
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Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
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--- Comment #16 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Wed, 26 Sep 2018, vincent-gcc at vinc17 dot net wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87390
>
> --- Comment #14 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
> (In reply to joseph@codesourcery.com from comment #13)
> > On Wed, 26 Sep 2018, vincent-gcc at vinc17 dot net wrote:
> >
> > > But there are no differences with 6.3.1.4 (when converting to a floating type):
> > > in both cases, either the value can be represented exactly, in which case it is
> > > unchanged, or it cannot, in which case it is rounded. When doing a conversion
> > > to some given type, the C standard does not care of the origin type of the
> > > value.
> >
> > In 6.3.1.5 in C99, that distinction is only applied in the case of
>
> which distinction?
The one you made above, between values that can be represented in the
target type, and those that cannot and are thus rounded.
> > demotions and explicit conversions (second paragraph); it does not apply
> > in the first paragraph (implicit promotions). I.e., the 6.3.1.4 handling
> > of conversions from integer to floating-point is analogous to the 6.3.1.5
> > second paragraph handling of demotions and explicit conversions from
> > floating-point to floating-point (not to the first paragraph handling of
> > implicit promotions).
>
> Analogous? Where does the C standard say that?
It doesn't say so directly. Rather, if you apply your comparison
(comment#12) of 6.3.1.4 and 6.3.1.5 ("in both cases, either the value can
be represented exactly, in which case it is unchanged, or it cannot, in
which case it is rounded"), I think it has to be one of 6.3.1.4 with
6.3.1.5 paragraph 2, and in 6.3.1.5 paragraph 2 there is no excess
precision in the result of the conversion.
I see no reason here, if someone has explicitly chosen an old standard
mode (-std=c99), to deviate from the interpretations of ambiguities used
since excess precision support was first added, given that the changes in
C11 did not results from the Defect Report process but from a separate
paper outside of that process.
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From: "vincent-gcc at vinc17 dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Wed, 26 Sep 2018 22:26:00 -0000
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--- Comment #17 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to joseph@codesourcery.com from comment #16)
> On Wed, 26 Sep 2018, vincent-gcc at vinc17 dot net wrote:
> > which distinction?
>
> The one you made above, between values that can be represented in the
> target type, and those that cannot and are thus rounded.
Then this distinction is also applied in the first paragraph: that's why there
is a parenthesis "(if the source value is represented in the precision and
range of its type)", meaning that the value can also change (and the full
description is in the second paragraph). The way it is specified is a bit ugly,
but I assume that this comes from the modification for TC3, and they didn't
want to rewrite everything at this point.
Note also that...
> > > demotions and explicit conversions (second paragraph); it does not apply
> > > in the first paragraph (implicit promotions).
This is wrong. The first paragraph does not concern only implicit promotions.
If you cast a float expression to double, this is an explicit conversion, and
there are still 2 cases: If the value is exactly representable, it is
unchanged; if the value is not exactly representable, it is rounded (that part
is actually described in the second paragraph, as I've just said above).
> > Analogous? Where does the C standard say that?
>
> It doesn't say so directly. Rather, if you apply your comparison
> (comment#12) of 6.3.1.4 and 6.3.1.5 ("in both cases, either the value can
> be represented exactly, in which case it is unchanged, or it cannot, in
> which case it is rounded"), I think it has to be one of 6.3.1.4 with
> 6.3.1.5 paragraph 2, and in 6.3.1.5 paragraph 2 there is no excess
> precision in the result of the conversion.
6.3.1.5p2 is only about explicit conversions and function calls (otherwise,
types are not demoted magically). But in my example, d == i + 1, no demotion is
involved.
> I see no reason here, if someone has explicitly chosen an old standard
> mode (-std=c99), to deviate from the interpretations of ambiguities used
> since excess precision support was first added, given that the changes in
> C11 did not results from the Defect Report process but from a separate
> paper outside of that process.
I think that C11 just clarified. There hasn't been a defect report against C99,
AFAIK. If you think that 6.3.1.5 implies a conversion to the semantic type,
then this should not be done just for values of integer source, but also for
those of floating-point source. But as I've said, this somewhat defeats the
purpose of extra precision and range.
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From: "vincent-gcc at vinc17 dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Wed, 26 Sep 2018 22:30:00 -0000
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--- Comment #18 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
Anyway, I recall that the behavior related to extra precision and range is
described by 6.3.1.8. Thus I really don't see why 6.3.1.4 and 6.3.1.5 would
come into play here (except in case of explicit conversion).
>From gcc-bugs-return-616418-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 22:31:07 2018
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Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Wed, 26 Sep 2018 22:31:00 -0000
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--- Comment #19 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Wed, 26 Sep 2018, vincent-gcc at vinc17 dot net wrote:
> 6.3.1.5p2 is only about explicit conversions and function calls (otherwise,
> types are not demoted magically). But in my example, d == i + 1, no demotion is
> involved.
Assignments and function return can also demote types. As explained in my
message adding the feature in the first place, I chose to treat all of
(assignment, initialization, cast, function call, function return,
increment and decrement as variants of assignment) the same (removing
excess precision in all cases), as a practical ABI matter when function
calls and return are involved (and including when the calls is to an
unprototyped or variadic function).
> I think that C11 just clarified. There hasn't been a defect report against C99,
Whereas I consider this an actual semantic change in C11, with no
allowance in C99 for any kind of conversion from integer to floating-point
to have a result with excess precision and such an allowance explicitly
added in C11.
>From gcc-bugs-return-616419-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 22:31:16 2018
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Subject: [Bug gcov-profile/86957] gcc should warn about missing profiles for a compilation unit or a new function with -fprofile-use
Date: Wed, 26 Sep 2018 22:38:00 -0000
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--- Comment #6 from qinzhao at gcc dot gnu.org ---
Author: qinzhao
Date: Wed Sep 26 22:29:54 2018
New Revision: 264657
URL: https://gcc.gnu.org/viewcvs?rev=264657&root=gcc&view=rev
Log:
2018-09-26 Indu Bhagat <indu.bhagat@oracle.com>
PR gcov-profile/86957
* common.opt: New warning option -Wmissing-profile.
* coverage.c (get_coverage_counts): Add warning for missing .gcda file.
* doc/invoke.texi: Document -Wmissing-profile.
Added:
trunk/gcc/testsuite/gcc.dg/Wmissing-profile.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/common.opt
trunk/gcc/coverage.c
trunk/gcc/doc/invoke.texi
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-616420-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 22:38:49 2018
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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Wed, 26 Sep 2018 22:49:00 -0000
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--- Comment #20 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
I think the statement in 6.3.1.8 is only observing a consequence of
specifications elsewhere, and stating that this excess range and precision
does not affect semantic types; it does not, by itself, result in any
expression having excess range and precision for a given value of
FLT_EVAL_METHOD, because it's the specification elsewhere that has those
results.
>From gcc-bugs-return-616421-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Sep 26 22:49:34 2018
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Subject: [Bug c++/87364] Pretty print of enumerator never prints the id, always falls back to C-style cast output
Date: Wed, 26 Sep 2018 23:02:00 -0000
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--- Comment #4 from Will Wray <wjwray at gmail dot com> ---
Thanks Martin,
I investigated enum template args with GCC bug 81932 test code,
repeating its GDB Python-debug-print test case for enum args.
Conclusion:
This change to enum printing does not cause GDB to fail to look up
non-type template specializations for enum type arguments;
the lookup succeeds and there's no missing-type Python Exception.
However, GDB still produces a warning for an RTTI lookup failure.
The warning is not serious; the type must be found some other way.
I reckon that demangling is the cause of the spurious warning.
It seems that demangle continues to output enums with C-style cast:
template type TreeVector<int, E::a>::Tree
demangles as TreeVector<int, (E)0>::Tree
Is this demangle angle a red-herring?
Is the C-style cast mandated by Itanium CXXABI for enum output?
Is demangler code even able to look up enumerators?
(I mean, does it have access to sufficient type information).
FYI I'm using #include <cxxabi.h> and abi::__cxa_demangle(name,...)
and compiling with my enum-patched-g++
(perhaps I'm picking up the system version of the abi library).
Same with clang, which has output enumerator ids for a long time
(and would normally output non-enumerated values as plain digits):
clang++ -stdlib=libc++ -lc++abi ...
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Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
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--- Comment #21 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to joseph@codesourcery.com from comment #20)
> I think the statement in 6.3.1.8 is only observing a consequence of
> specifications elsewhere,
No, 6.3.1.8 gives a specification about the choices of the types for the
operations. It is not an informative part of the standard. And in it, there is
nothing that differentiates integer sources from floating-point sources. This
is just an operand converted to (here) a floating-point type. Note: at this
point, the precision and range are unspecified, and that's why 6.3.1.4 and
6.3.1.5 do not come into play and are currently unrelated. It is only when
considering 5.2.4.2.2p8 (about FLT_EVAL_METHOD) that a specification can be
given using 6.3.1.4 and 6.3.1.5: with FLT_EVAL_METHOD = 2, "evaluate all
operations and constants to the range and precision of the long double type",
so that 6.3.1.4 and 6.3.1.5 are applied with long double as the target type for
conversions.
> and stating that this excess range and precision
> does not affect semantic types;
Note that the reason this is described like that may be that the expression
needs to have a type, which cannot necessarily be expressed by the range and
precision (think of FLT_EVAL_METHOD = -1, for instance).
> it does not, by itself, result in any
> expression having excess range and precision for a given value of
> FLT_EVAL_METHOD, because it's the specification elsewhere that has those
> results.
5.2.4.2.2p8 (about FLT_EVAL_METHOD) just gives *additional* information about
the range and precision when FLT_EVAL_METHOD is not -1.
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Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Wed, 26 Sep 2018 23:41:00 -0000
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--- Comment #22 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
6.3.1.8 specifies *types*. It only gives some partial information about
*evaluation formats*, which is essentially a consequence of information
elsewhere (it states the possibility of wider evaluation formats, while
never requiring them to be used, and states that when they are used they
don't affect the types). I think 5.2.4.2.2 has the main specification of
when wider evaluation formats are used. I think the combined effect of
5.2.4.2.2 and 6.3.1.5 is that the particular form of implicit conversion
involved in the usual arithmetic conversions does not *remove* excess
range and precision from an operand to an operator that applies the usual
arithmetic conversions, but that this does not result in excess precision
being *introduced* by such an implicit conversion when the argument was of
integer type, in the absence of any explicit wording providing for such
conversions to result in a value with excess precision.
There are places where it is unspecified even in C11 whether an implicit
conversion does or does not result in a value with excess range and
precision. For example, for function return in the absence of Annex F
(when Annex F is implemented, function return is required to remove excess
range and precision).
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87392] UBSAN behavior on left-shifting 1 into the sign bit is dependent on C standard
Date: Wed, 26 Sep 2018 23:46:00 -0000
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--- Comment #8 from Eugeniu Rosca <roscaeugeniu at gmail dot com> ---
On 2018-09-25 at 08:53:34 UTC, Jonathan Wakely wrote in comment #6:
> He already did. Comment 1 quotes the GCC manual which references
> the relevant sections of the standards.
Comment 1 does indeed reference "(C90 6.3, C99 and C11 6.5)". But if you check
my first post again, you'll see that neither C89->"3.3.7 Bitwise shift
operators" [18] nor its C90 [19] counterpart C90->"6.3.7 Bitwise shift
operators" says a word about signed integers in the definition of the '<<'
operator. This is in contrast with later C standards which supplement the
definition of "E1 << E2" by "If E1 has a signed type ...". It is simply not
possible to conclude from C89->3.3.7 or from C90->6.3.7 that "left-shifting of
signed integer into the sign bit" is implementation-defined behavior. The
C89/C90 sections conveying this message are:
- C89: "A.6.3 Implementation-defined behavior" -> "A.6.3.4 Integers"
- C90: "G.3 Implementation-defined behavior" -> "G.3.5 Integers"
The latter is referenced by you in Comment 6, but not in Comment 1.
> > - Since U-Boot is compiled using '-std=gnu11' and since UBSAN reports
> > (1 << 31) as undefined behavior and since C11 standard says that
> > encountering an UB the compiler may "ignore the situation completely
> > with unpredictable results",
> It may do that, or it may do other things (like print a UBsan error).
I wish there was an "and" relationship between the two, i.e. the error to be
dependent on the UB, with no false positives.
> > what are there real-life issues expected from shifting signed
> > integers into (*not past*) the sign bit? What to expect in the worst case?
> I think with GCC the worst that will happen is you get a UBsan error (which
> might make the program abort, depending on the options used to compile it).
In U-Boot/Linux kernel execution goes on, so the latter is not of concern.
I am quite surprised that, in spite of no harm expected from shifting a signed
integer into the sign bit, GCC (std=c99, std=c11) still decides to fire a
warning. It seems like the idea behind UBSAN is to inform the user about what C
standard says on paper rather than how it is implemented. This is quite
unfortunate.
> You've already been given the link to the GCC documentation which says
> that GCC doesn't treat it as undefined in C99 and C11, even though the
> standards (and UBsan) say it's undefined.
Ok, let's come back to it. Here is what you refer to:
-----8<-----
As an extension to the C language, GCC does not use the latitude given in C99
and C11 only to treat certain aspects of signed ‘<<’ as undefined. However,
-fsanitize=shift (and -fsanitize=undefined) will diagnose such cases.
-----8<-----
I am not sure if you or anybody else cares, but this sounds pretty similar to
"Some children study too hard to succeed" [20]. I can understand the above
excerpt in two ways:
1. As an extension to the C language, GCC does not use the latitude given in
C99 and C11 in order to treat only certain aspects of signed ‘<<’ as undefined.
[..]
2. As an extension to the C language, GCC does not use the latitude given in
C99 and C11 of only treating certain aspects of signed ‘<<’ as undefined. [..]
Regardless of the variant I pick, without GCC community support I'm still
clueless about:
- what kind of latitude is provided by C99/C11 standards.
- which gcc aspects of signed ‘<<’ diverge from the C99/C11 standards and which
do not.
> There is no bug here. It's correct for UBsan to depend on the C standard chosen,
> because what is and isn't undefined depends on the standard.
As expressed above, my expectation was that UBSAN reflects how compiler
implements the standard rather than what standard itself says. I am still
surprised that this expectation is broken, but I will just accept it and keep
going. It's also unfortunate that, as a user, I can't disable the UBSAN warning
of shifting into (not past) the sign bit. Enabling either
-fsanitize=shift-exponent or -fsanitize=shift-base alone would disable other
precious UBSAN warnings as a side effect, which is not acceptable.
All in all, the summary which I take from this discussion is "don't be
concerned about left shifting into the sign bit, even if UBSAN annoys you with
a warning".
If there is no way GCC folks can support communities like U-Boot/coreboot to at
least individually turn off benign UBSAN warnings, I have no choice but to
finally agree with the status of this bug report.
Thanks and regards,
Eugeniu.
[18] http://port70.net/~nsz/c/c89/c89-draft.html
[19]
http://read.pudn.com/downloads133/doc/565041/ANSI_ISO%2B9899-1990%2B[1].pdf
[20]
https://guinlist.wordpress.com/2016/02/08/124-structures-with-a-double-meaning/
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Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
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--- Comment #23 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to joseph@codesourcery.com from comment #22)
> 6.3.1.8 specifies *types*. It only gives some partial information about
> *evaluation formats*, which is essentially a consequence of information
> elsewhere (it states the possibility of wider evaluation formats, while
> never requiring them to be used, and states that when they are used they
> don't affect the types).
No, this does not reflect the historical practice. Information in 6.3.1.8
predates information you can find elsewhere. You can see a C89 draft here:
https://port70.net/~nsz/c/c89/c89-draft.html
3.2.1.5 Usual arithmetic conversions[*]
(which was the old 6.3.1.8) already has: "The values of operands and of the
results of expressions may be represented in greater precision and range than
that required by the type; the types are not changed thereby." but information
you can now find in 5.2.4.2.2 is not present (in particular, FLT_EVAL_METHOD
does not exist).
[*] https://port70.net/~nsz/c/c89/c89-draft.html#3.2.1.5
> I think 5.2.4.2.2 has the main specification of
> when wider evaluation formats are used.
It completes information from 6.3.1.8. But if FLT_EVAL_METHOD = -1, this is
just like old C89 behavior and its clause 3.2.1.5 (corresponding to 6.3.1.8 in
C99).
> I think the combined effect of
> 5.2.4.2.2 and 6.3.1.5 is that the particular form of implicit conversion
> involved in the usual arithmetic conversions does not *remove* excess
> range and precision from an operand to an operator that applies the usual
> arithmetic conversions, but that this does not result in excess precision
> being *introduced* by such an implicit conversion when the argument was of
> integer type, in the absence of any explicit wording providing for such
> conversions to result in a value with excess precision.
5.2.4.2.2p8 does not have specific rules for integer types. It says "[...]
values subject to the usual arithmetic conversions [...] are evaluated to a
format whose range and precision may be greater than required by the type."
This is quite clear: values subject to the usual arithmetic conversions can
either be floating-point values or integer values, as described in "6.3.1.8
Usual arithmetic conversions". And for FLT_EVAL_METHOD = 2, the format in
question is long double.
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Subject: [Bug c/87392] UBSAN behavior on left-shifting 1 into the sign bit is dependent on C standard
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--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Eugeniu Rosca from comment #8)
> On 2018-09-25 at 08:53:34 UTC, Jonathan Wakely wrote in comment #6:
>
> > He already did. Comment 1 quotes the GCC manual which references
> > the relevant sections of the standards.
>
> Comment 1 does indeed reference "(C90 6.3, C99 and C11 6.5)". But if you
> check my first post again, you'll see that neither C89->"3.3.7 Bitwise shift
> operators" [18] nor its C90 [19] counterpart C90->"6.3.7 Bitwise shift
> operators" says a word about signed integers in the definition of the '<<'
> operator. This is in contrast with later C standards which supplement the
> definition of "E1 << E2" by "If E1 has a signed type ...". It is simply not
> possible to conclude from C89->3.3.7 or from C90->6.3.7 that "left-shifting
> of signed integer into the sign bit" is implementation-defined behavior. The
> C89/C90 sections conveying this message are:
> - C89: "A.6.3 Implementation-defined behavior" -> "A.6.3.4 Integers"
> - C90: "G.3 Implementation-defined behavior" -> "G.3.5 Integers"
But then there is a defect report against C90 which takes exclitly about this:
http://www.open-std.org/jtc1/sc22/wg14/www/docs/dr_081.html
So there is still no bug. The C90 and C99 standards differ here and that is
plain and simple with that defect report showing their intent for C90 and all.
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Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
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Joseph S. Myers <jsm28 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #24 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
You note that "values subject to the usual arithmetic conversions can either be
floating-point values or integer values". Only in the floating-point case is
excess range and precision applicable to them; there is no such concept for
values with integer types (values *resulting* from the usual arithmetic
conversions are a separate matter, where the rules for implicit conversions
must apply to determine when there is excess range and precision). (I don't
think 5.2.4.2.2 is that well phrased, but I don't think in C99 it requires
excess precision for the results of such conversions from floating-point to
integer.)
The interpretation of C99 rules for excess precision used in GCC has been
explained at length from 2008 onwards. In case of doubt about whether some
change reflects a defect, or about whether the resolution of a DR against one
standard should be considered also to apply to a previous version, we
deliberately keep compatibility with the existing interpretation for previous
standard versions and only apply the change to newer ones, on the basis that
users of -std= options for old standards should get stability and there is no
way to get a DR resolution for what something "should" mean in an old standard
version (even for features within the current standard but obsolescent, such as
unprototyped functions, in practice you have to come up with your own
reasonable interpretations and stick to them because WG14 doesn't want to
clarify how things should work there).
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Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Thu, 27 Sep 2018 01:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87390
--- Comment #25 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to Joseph S. Myers from comment #24)
> You note that "values subject to the usual arithmetic conversions can either
> be floating-point values or integer values". Only in the floating-point
> case is excess range and precision applicable to them; there is no such
> concept for values with integer types (values *resulting* from the usual
> arithmetic conversions are a separate matter, where the rules for implicit
> conversions must apply to determine when there is excess range and
> precision). (I don't think 5.2.4.2.2 is that well phrased, but I don't
> think in C99 it requires excess precision for the results of such
> conversions from floating-point to integer.)
Yes, 5.2.4.2.2 is not well-written, but I think that it is something that is
only on top of other clauses. For instance, 6.3.1.8p2 is more explicit: "The
values of floating operands [...]", and 6.3.1.8 itself is applied only in the
context of each particular operation that are based on these usual arithmetic
conversions, as said at the beginning of 6.3: "The list in 6.3.1.8 summarizes
the conversions performed by most ordinary operators; it is supplemented as
required by the discussion of each operator in 6.5."
For instance, in my example, I was using "==", and "6.5.9 Equality operators"
says: "If both of the operands have arithmetic type, the usual arithmetic
conversions are performed. [...]", i.e. it refers to 6.3.1.8. And for an
operation with floating-point operands (which was the case for "==" in my
example), additional information is given by 5.2.4.2.2.
> The interpretation of C99 rules for excess precision used in GCC has been
> explained at length from 2008 onwards.
Could you cite where this bug is documented in GCC?
Even if this was an old, incorrect interpretation in GCC, saying that the bug
is fixed is misleading.
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From: "chrisj at rtems dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/81797] gcc 7.1.0 fails to build on macOS 10.13 (High Sierra):
Date: Thu, 27 Sep 2018 02:07:00 -0000
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--- Comment #65 from Chris Johns <chrisj at rtems dot org> ---
I am still seeing this issue with the patch
https://gcc.gnu.org/ml/gcc-patches/2018-02/msg00933.html applied to gcc-7.3.0
(RTEMS 5 [master]) tool builds. This is on Mojave and an fully updated Xcode.
The ARM tools built but the SPARC tools do not and it currently seem
repeatable. This is on a 2.6GHz i7 with an internal 1T SSD.
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From: "asolokha at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/87446] New: [7/8/9 Regression] ICE in expand_LOOP_VECTORIZED, at internal-fn.c:2431
Date: Thu, 27 Sep 2018 02:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87446
Bug ID: 87446
Summary: [7/8/9 Regression] ICE in expand_LOOP_VECTORIZED, at
internal-fn.c:2431
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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gcc-9.0.0-alpha20180923 snapshot (r264518) ICEs when compiling the following
snippet w/ -O3 (-Ofast) -fno-code-hoisting -fno-expensive-optimizations
-fno-tree-ccp -fno-tree-copy-prop -fno-tree-dce -fno-tree-dominator-opts
-fno-tree-forwprop -fno-tree-pre -fno-tree-scev-cprop:
int
kg (int fs)
{
int ij;
unsigned int jt;
for (jt = 0; jt < 1; ++jt)
{
++fs;
ij = fs;
}
return ij;
}
% gcc-9.0.0-alpha20180923 -O3 -fno-code-hoisting -fno-expensive-optimizations
-fno-tree-ccp -fno-tree-copy-prop -fno-tree-dce -fno-tree-dominator-opts
-fno-tree-forwprop -fno-tree-pre -fno-tree-scev-cprop -c kj92n7c0.c
during RTL pass: expand
kj92n7c0.c: In function 'kg':
kj92n7c0.c:2:1: internal compiler error: in expand_LOOP_VECTORIZED, at
internal-fn.c:2431
2 | kg (int fs)
| ^~
0x625c4a expand_LOOP_VECTORIZED
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/internal-fn.c:2431
0x89c1d7 expand_call_stmt
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/cfgexpand.c:2603
0x89c1d7 expand_gimple_stmt_1
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/cfgexpand.c:3582
0x89c1d7 expand_gimple_stmt
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/cfgexpand.c:3741
0x89d1e1 expand_gimple_basic_block
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/cfgexpand.c:5777
0x8a1fe7 execute
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/cfgexpand.c:6382
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From: "vincent-gcc at vinc17 dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87447] New: Missing -Wconversion warning in implicit conversion of unsigned long long to double
Date: Thu, 27 Sep 2018 04:45:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87447
Bug ID: 87447
Summary: Missing -Wconversion warning in implicit conversion of
unsigned long long to double
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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With -Wconversion, gcc does not warn on the following program, at least on
x86_64.
int foo (double x)
{
return x == (1ULL << 63) + 1;
}
Here, (1ULL << 63) + 1 is implicitly converted to double, thus with a change of
value (since double has only a 53-bit significand and (1ULL << 63) + 1 needs 64
bits). Therefore, a -Wconversion warning is expected.
Tested with:
gcc (Debian 20180822-1) 9.0.0 20180822 (experimental) [trunk revision 263760]
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Subject: [Bug fortran/87448] New: ICE at trans-expr:3417 in allocate statement with type signature using an associated variable
Date: Thu, 27 Sep 2018 06:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87448
Bug ID: 87448
Summary: ICE at trans-expr:3417 in allocate statement with type
signature using an associated variable
Product: gcc
Version: 8.1.0
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The following code triggers an ICE (also seen in some gfortran-7 version):
module mod
implicit none
public
contains
function fun(cs) result(rs)
character(len=:), allocatable :: rs
character(len=*), intent(in) :: cs
associate(l => len(cs))
allocate(character(len=1+l) :: rs)
end associate
end function fun
end module mod
gfortran -c assoc_len.f90 gives
assoc_len.f90:13:0:
allocate(character(len=1+l) :: rs)
internal compiler error: in gfc_conv_expr_op, at fortran/trans-expr.c:3417
0x5b156d gfc_conv_expr_op
../.././gcc/fortran/trans-expr.c:3417
0x5b156d gfc_conv_expr(gfc_se*, gfc_expr*)
../.././gcc/fortran/trans-expr.c:7918
0x72bfb9 gfc_trans_allocate(gfc_code*)
../.././gcc/fortran/trans-stmt.c:6115
0x6bc4b7 trans_code
../.././gcc/fortran/trans.c:1996
0x72858f gfc_trans_block_construct(gfc_code*)
../.././gcc/fortran/trans-stmt.c:2058
0x6bc527 trans_code
../.././gcc/fortran/trans.c:1924
0x6e293b gfc_generate_function_code(gfc_namespace*)
../.././gcc/fortran/trans-decl.c:6507
0x6bfec9 gfc_generate_module_code(gfc_namespace*)
../.././gcc/fortran/trans.c:2222
0x6734f4 translate_all_program_units
../.././gcc/fortran/parse.c:6108
0x6734f4 gfc_parse_file()
../.././gcc/fortran/parse.c:6324
0x6b991f gfc_be_parse_file
../.././gcc/fortran/f95-lang.c:204
The problem is triggered by the combination of using associate in conjunction
with the allocate. With a local variable instead of the associate for l, or
with another statement instead of an allocate (i.e. "print *,l), gfortran
compiles.
Also when simplifying the length expression in the allocate from "len=1+l" to
just "len=l" the ICE disappears.
>From gcc-bugs-return-616433-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 06:58:46 2018
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Subject: [Bug gcov-profile/86957] gcc should warn about missing profiles for a compilation unit or a new function with -fprofile-use
Date: Thu, 27 Sep 2018 07:34:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
Thanks for working on that. Implemented.
>From gcc-bugs-return-616434-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 07:34:32 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/87446] [7/8/9 Regression] ICE in expand_LOOP_VECTORIZED, at internal-fn.c:2431
Date: Thu, 27 Sep 2018 07:35:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-27
CC| |marxin at gcc dot gnu.org,
| |rguenth at gcc dot gnu.org,
| |wschmidt at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r242550, but maybe it just exposed a latent bug?
>From gcc-bugs-return-616435-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 07:35:10 2018
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Subject: [Bug gcov-profile/87442] Add options to filter files we want to instrument for code coverage
Date: Thu, 27 Sep 2018 07:47:00 -0000
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Maybe the other way around:
-fprofile-filter-files
-fprofile-exclude-files
>From gcc-bugs-return-616436-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 07:47:05 2018
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Subject: [Bug libstdc++/81797] gcc 7.1.0 fails to build on macOS 10.13 (High Sierra):
Date: Thu, 27 Sep 2018 07:53:00 -0000
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--- Comment #66 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes, I was afraid the RTEMS failures might be a different problem.
Are the symptoms the same? i.e. missing C++ standard library headers?
Comment 17 suggests you're seeing missing libgcc headers, which is created by a
different makefile. Maybe a similar kluge is needed in libgcc/Makefile for
build=*darwin*
What are your build, host and target triplets?
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/87444] 'gcc -marc=native' sets L2 cache size equal to L3 cache size on i7 and i5 CPU
Date: Thu, 27 Sep 2018 07:58:00 -0000
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to George from comment #4)
> Richard Biener,
>
> Thanks for the reply. Unfortunately I don't understand what it means -
> whether I should set explicitly the correct l2-cache-size or if that has any
> effect on the final binary.
>
> But I realise this may not be the place for questions. In which particular
> mailing list may I get reply to my question please?
For prefetching (the only thing that uses the L2 numbers) the L3 size (last
level cache) is more appropriate here. As said that could be probably better
reflected in the code.
IIRC there's even CPUs with L4 cache. And with CPUs with SMT even L1 isn't
exclusive to a thread. Modeling the memory subsystem with main memory, L2 and
L1 isn't really state of the art any more.
You can ask on gcc-help@gcc.gnu.org
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Subject: [Bug fortran/87448] ICE at trans-expr:3417 in allocate statement with type signature using an associated variable
Date: Thu, 27 Sep 2018 08:14:00 -0000
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janus at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-27
CC| |janus at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from janus at gcc dot gnu.org ---
Confirmed. The ICE is present since version 6. gfortran 5.5 rejects the example
with this bogus error:
associate(l => len(cs))
1
Error: Symbol ‘l’ at (1) has no IMPLICIT type
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Subject: [Bug fortran/87449] New: -Wunused-variable and associate
Date: Thu, 27 Sep 2018 08:14:00 -0000
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Bug ID: 87449
Summary: -Wunused-variable and associate
Product: gcc
Version: 8.2.1
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: fortran
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Target: x86_64-pc-linux-gnu
Warning messages about unused variables (-Wunused-variable) appear wrongly when
associate is used (false positive):
pprogram test
implicit none
real :: a = 5
real :: b
associate(b => a)
write(6,*) b
end associate
end program
gives
Warning: Unused variable ‘b’ declared at (1) [-Wunused-variable]
when complied with -Wunused-variable
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Subject: [Bug target/87444] 'gcc -marc=native' sets L2 cache size equal to L3 cache size on i7 and i5 CPU
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--- Comment #6 from George <studio at anchev dot net> ---
Thanks!
>From gcc-bugs-return-616441-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 08:14:54 2018
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Subject: [Bug fortran/87448] ICE at trans-expr:3417 in allocate statement with type signature using an associated variable
Date: Thu, 27 Sep 2018 08:19:00 -0000
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--- Comment #2 from martin <mscfd at gmx dot net> ---
Originally I came across this problem in a large module with a slightly more
complex function with gfortran-7.3.0 (standard version from ubuntu 18.4). I got
the same bogus error, which Janus has seen for this reduced testcase with
gfortran-5.5. Taking out the function and related class I got the ICE, but was
not able to reproduce this error.
In short: I think that the bogus error is still present in recent gfortran
versions (or is just another symptom of this problem).
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Subject: [Bug fortran/87450] New: -Wunused-variable: false positive for associate
Date: Thu, 27 Sep 2018 08:30:00 -0000
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Bug ID: 87450
Summary: -Wunused-variable: false positive for associate
Product: gcc
Version: 8.2.1
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
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Warning messages about unused variables (-Wunused-variable) appear wrongly when
associate is used (false positive):
pprogram test
implicit none
real :: a = 5
real :: b
associate(b => a)
write(6,*) b
end associate
end program
gives
Warning: Unused variable ‘b’ declared at (1) [-Wunused-variable]
when complied with -Wunused-variable
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Subject: [Bug libstdc++/81797] gcc 7.1.0 fails to build on macOS 10.13 (High Sierra):
Date: Thu, 27 Sep 2018 08:33:00 -0000
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--- Comment #67 from Chris Johns <chrisj at rtems dot org> ---
(In reply to Jonathan Wakely from comment #66)
> Yes, I was afraid the RTEMS failures might be a different problem.
>
> Are the symptoms the same? i.e. missing C++ standard library headers?
>
Yes it seems to be the same issue I was seeing when we first looked into the
problem.
> Comment 17 suggests you're seeing missing libgcc headers, which is created
> by a different makefile. Maybe a similar kluge is needed in libgcc/Makefile
> for build=*darwin*
Is it? I think that file is being installed in the same way. Could it be the
RTEMS target config has a different list?
> What are your build, host and target triplets?
They are:
--build=x86_64-apple-darwin18.0.0
--target=sparc-rtems5
--host=x86_64-apple-darwin18.0.0
The configure command line is ...
../gcc-7.3.0/configure --prefix=/Users/chris/development/rtems/5
--bindir=/Users/chris/development/rtems/5/bin
--exec_prefix=/Users/chris/development/rtems/5
--includedir=/Users/chris/development/rtems/5/include
--libdir=/Users/chris/development/rtems/5/lib
--libexecdir=/Users/chris/development/rt
ems/5/libexec --mandir=/Users/chris/development/rtems/5/share/man
--infodir=/Users/chris/development/rtems/5/share/info
--datadir=/Users/chris/development/rtems/5/share
--build=x86_64-apple-darwin18.0.0 --host=x86_64-apple-darwin18.0.0
--target=sparc-rtems5 --disable-libstdcxx-pch --with-gnu-as --with-gnu-ld
--verbose --with-newlib --disable-nls --without-included-gettext
--disable-win32-registry --enable-version-specific-runtime-libs --disable-lto
--enable-newlib-io-c99-formats --enable-newlib-iconv
--enable-newlib-iconv-encodings=big5,cp775,cp850,cp852,cp855,cp866,euc_jp,euc_kr,euc_tw,iso_88
59_1,iso_8859_10,iso_8859_11,iso_8859_13,iso_8859_14,iso_8859_15,iso_8859_2,iso_8859_3,iso_8859_4,iso_8859_5,iso_8859_6,iso_8859_7,iso_8859_8,iso_8859_9,iso_ir_111,koi8_r,koi8_ru,koi8_u,koi8_uni,ucs_2,ucs_2_internal,ucs_2be,ucs_2le,ucs_4,ucs_4_internal,ucs_4be,ucs_4le,us_ascii,utf_16,utf_16be,utf_16
le,utf_8,win_1250,win_1251,win_1252,win_1253,win_1254,win_1255,win_1256,win_1257,win_1258
--enable-threads --disable-plugin --enable-libgomp --enable-languages=c,c++
>From gcc-bugs-return-616444-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 08:33:50 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/87446] [7/8/9 Regression] ICE in expand_LOOP_VECTORIZED, at internal-fn.c:2431
Date: Thu, 27 Sep 2018 08:34:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |7.4
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
OK, so the issue is that there's a missed CFG cleanup run somewhere (eventually
done by one of the passes you disable). We have
# j = PHI<1>
if (j == 0)
loop!
else
loop exit
and we happily if-convert single-argument PHIs (boo). if-conversion then
will do the CFG cleanup and that scraps the fallback loop while the
if-converted loop now looks like
j = 1;
if (j == 0)
....
which CFG cleanup doesn't "handle".
-> Kaboom.
I'd say "doctor it hurts", but of course we should cleanup the CFG properly.
This time the offender is VRP which performs jump-threading and then
CFG cleanup but with SSA not updated. This then runs into
gimple_can_merge_blocks_p (a=<basic_block 0x7ffff68986e8 (7)>,
b=<basic_block 0x7ffff6898340 (4)>) at /tmp/trunk/gcc/tree-cfg.c:1883
1939 for (gphi_iterator gsi = gsi_start_phis (b); !gsi_end_p (gsi);
1940 gsi_next (&gsi))
1941 {
1942 gphi *phi = gsi.phi ();
1943 /* Technically only new names matter. */
1944 if (name_registered_for_update_p (PHI_RESULT (phi)))
1945 return false;
1946 }
and so not merging two blocks which would propagate out the single-arg PHI.
I also believe the comment is wrong and we cannot propagate the PHI out.
But we could in theory simply create a copy (which of course wouldn't solve
the issue at hand).
So one solution might be to force a phi-only-cprop pass before
tree-if-conversion but then if you disable that manually you're screwed again
;)
Or try re-organizing TODO processing to "interleave" update-SSA and
cleanup-CFG. We basically need cleanup_control_flow_pre () be performed
first, then update-SSA if required and then continue.
static void
execute_function_todo (function *fn, void *data)
{
bool from_ipa_pass = (cfun == NULL);
unsigned int flags = (size_t)data;
flags &= ~fn->last_verified;
if (!flags)
return;
push_cfun (fn);
/* Always cleanup the CFG before trying to update SSA. */
if (flags & TODO_cleanup_cfg)
{
cleanup_tree_cfg ();
...
if (flags & TODO_update_ssa_any)
{
unsigned update_flags = flags & TODO_update_ssa_any;
update_ssa (update_flags);
anyhow this seems low-priority and certainly I don't think CFG cleanup
(or loop fixup) should in any way be forced to kill LOOP_VECTORIZED IFN calls.
>From gcc-bugs-return-616445-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 08:34:29 2018
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Subject: [Bug c++/84940] [7/8/9 Regression] internal compiler error: in build_value_init_noctor, at cp/init.c:465
Date: Thu, 27 Sep 2018 09:08:00 -0000
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--- Comment #6 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Thu Sep 27 08:33:41 2018
New Revision: 264664
URL: https://gcc.gnu.org/viewcvs?rev=264664&root=gcc&view=rev
Log:
/cp
2018-09-27 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84940
* semantics.c (finish_unary_op_expr): Check return value of
build_x_unary_op for error_mark_node.
/testsuite
2018-09-27 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/84940
* g++.dg/expr/unary4.C: New.
Added:
trunk/gcc/testsuite/g++.dg/expr/unary4.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/semantics.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-616446-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 09:08:04 2018
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Subject: [Bug c++/85908] Internal error with concepts and polymorphic lambdas
Date: Thu, 27 Sep 2018 09:13:00 -0000
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--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> ---
I can't reproduce the issue with the released 8.1.0
>From gcc-bugs-return-616447-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 09:13:54 2018
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Subject: [Bug c++/85241] Requires-expressions, fold expressions, and member function templates with dependent parameters don't play nicely
Date: Thu, 27 Sep 2018 09:14:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks| |67491
--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Closely related to PR68812
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
[Bug 67491] [meta-bug] concepts issues
>From gcc-bugs-return-616448-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 09:14:38 2018
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Subject: [Bug c++/85229] .[concepts] ICE with local class in lambda
Date: Thu, 27 Sep 2018 09:16:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-27
Ever confirmed|0 |1
>From gcc-bugs-return-616449-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 09:16:19 2018
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Subject: [Bug c++/84810] [concepts][c++20] constraints of lambdas with explicit template parameters are not checked
Date: Thu, 27 Sep 2018 09:18:00 -0000
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-27
Blocks| |67491
Ever confirmed|0 |1
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
[Bug 67491] [meta-bug] concepts issues
>From gcc-bugs-return-616450-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 09:18:39 2018
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Subject: [Bug c++/86000] ICE with requires statement in a non constexpr if
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-27
Blocks| |67491
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Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
[Bug 67491] [meta-bug] concepts issues
>From gcc-bugs-return-616451-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 09:20:22 2018
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Subject: [Bug c++/86269] [concepts] ICE with intermediate concepts notation
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-27
Blocks| |67491
Ever confirmed|0 |1
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491
[Bug 67491] [meta-bug] concepts issues
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Subject: [Bug debug/87451] New: [9 Regression] FAIL: gcc.dg/debug/dwarf2/inline5.c on aarch64 and arm
Date: Thu, 27 Sep 2018 09:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87451
Bug ID: 87451
Summary: [9 Regression] FAIL: gcc.dg/debug/dwarf2/inline5.c on
aarch64 and arm
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: debug
Assignee: unassigned at gcc dot gnu.org
Reporter: ktkachov at gcc dot gnu.org
CC: rguenth at gcc dot gnu.org
Target Milestone: ---
Target: aarch64, arm
The new test fails on aarch64 and arm:
FAIL: gcc.dg/debug/dwarf2/inline5.c scan-assembler-times
DW_TAG_lexical_block\\)[^#]*# DW_AT_abstract_origin 2
FAIL: gcc.dg/debug/dwarf2/inline5.c scan-assembler-times
DW_TAG_lexical_block\\)[^#]*# \\(DIE \\(0x[0-9a-f]*\\) DW_TAG_variable 1
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Subject: [Bug debug/87451] FAIL: gcc.dg/debug/dwarf2/inline5.c on aarch64 and arm
Date: Thu, 27 Sep 2018 09:53:00 -0000
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ktkachov at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.0
Summary|[9 Regression] FAIL: |FAIL:
|gcc.dg/debug/dwarf2/inline5 |gcc.dg/debug/dwarf2/inline5
|.c on aarch64 and arm |.c on aarch64 and arm
Known to fail| |9.0
--- Comment #1 from ktkachov at gcc dot gnu.org ---
Not a regression I guess since it's a new test.
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Subject: [Bug c++/67544] ICE: SIGSEGV in tree_check3 (tree.h:2896) with -fconcepts
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--- Comment #1 from paolo at gcc dot gnu.org <paolo at gcc dot gnu.org> ---
Author: paolo
Date: Thu Sep 27 09:53:08 2018
New Revision: 264665
URL: https://gcc.gnu.org/viewcvs?rev=264665&root=gcc&view=rev
Log:
2018-09-27 Paolo Carlini <paolo.carlini@oracle.com>
PR c++/67544
* g++.dg/concepts/pr67544.C: New.
Added:
trunk/gcc/testsuite/g++.dg/concepts/pr67544.C
Modified:
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/67544] ICE: SIGSEGV in tree_check3 (tree.h:2896) with -fconcepts
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |7.0
--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Fixed long time ago.
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/67491] [meta-bug] concepts issues
Date: Thu, 27 Sep 2018 10:13:00 -0000
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Bug 67491 depends on bug 67544, which changed state.
Bug 67544 Summary: ICE: SIGSEGV in tree_check3 (tree.h:2896) with -fconcepts
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67544
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/81797] gcc 7.1.0 fails to build on macOS 10.13 (High Sierra):
Date: Thu, 27 Sep 2018 11:02:00 -0000
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--- Comment #68 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Chris Johns from comment #67)
> (In reply to Jonathan Wakely from comment #66)
> > Yes, I was afraid the RTEMS failures might be a different problem.
> >
> > Are the symptoms the same? i.e. missing C++ standard library headers?
> >
>
> Yes it seems to be the same issue I was seeing when we first looked into the
> problem.
So not failing on "bits/gthr.h" then? I'm still not clear exactly what part
fails for you now.
> > Comment 17 suggests you're seeing missing libgcc headers, which is created
> > by a different makefile. Maybe a similar kluge is needed in libgcc/Makefile
> > for build=*darwin*
>
> Is it? I think that file is being installed in the same way. Could it be the
> RTEMS target config has a different list?
Ah yes, my mistake, libstdc++ creates
$target/include/x86_64-pc-linux-gnu/bits/gthr.h
I thought we found that in $target/libgcc/ instead, but in fact we process the
libgcc/gthr.h header using sed and create our own version.
That means it's definitely *not* the same way as the other headers, because the
others are symlinks into the source tree.
Please clarify exactly what your current failure is.
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/87451] FAIL: gcc.dg/debug/dwarf2/inline5.c on aarch64 and arm
Date: Thu, 27 Sep 2018 11:16:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-09-27
Version|unknown |9.0
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, looks like the test depends on the fix for PR87440 to go in. So let's
just wait until Jason approves that. As you can see the testcase is named
inline5.c
and the mentioned adds inline4.c which means I expected to install them in the
other way around ...
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Subject: [Bug middle-end/82089] emit_cstore sign-extends BImode result for STORE_FLAG_VALUE == 1
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--- Comment #7 from Andrew Stubbs <ams at gcc dot gnu.org> ---
Author: ams
Date: Thu Sep 27 11:15:48 2018
New Revision: 264666
URL: https://gcc.gnu.org/viewcvs?rev=264666&root=gcc&view=rev
Log:
[pr82089] Don't sign-extend SFV 1 in BImode
This is an update of the patch posted to PR82089 long ago. We ran into the
same bug on GCN, so we need this fixed as part of this series.
2018-09-27 Andrew Stubbs <ams@codesourcery.com>
Tom de Vries <tom@codesourcery.com>
PR 82089
gcc/
* expmed.c (emit_cstore): Fix handling of result_mode == BImode and
STORE_FLAG_VALUE == 1.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/expmed.c
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Subject: [Bug middle-end/82089] emit_cstore sign-extends BImode result for STORE_FLAG_VALUE == 1
Date: Thu, 27 Sep 2018 11:51:00 -0000
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Andrew Stubbs <ams at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #8 from Andrew Stubbs <ams at gcc dot gnu.org> ---
Patch committed. This is now fixed on the trunk.
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From: "chrisj at rtems dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/81797] gcc 7.1.0 fails to build on macOS 10.13 (High Sierra):
Date: Thu, 27 Sep 2018 12:03:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81797
--- Comment #69 from Chris Johns <chrisj at rtems dot org> ---
(In reply to Jonathan Wakely from comment #68)
> (In reply to Chris Johns from comment #67)
> > (In reply to Jonathan Wakely from comment #66)
> > > Yes, I was afraid the RTEMS failures might be a different problem.
> > >
> > > Are the symptoms the same? i.e. missing C++ standard library headers?
> > >
> >
> > Yes it seems to be the same issue I was seeing when we first looked into the
> > problem.
>
> So not failing on "bits/gthr.h" then? I'm still not clear exactly what part
> fails for you now.
>
> > > Comment 17 suggests you're seeing missing libgcc headers, which is created
> > > by a different makefile. Maybe a similar kluge is needed in libgcc/Makefile
> > > for build=*darwin*
> >
> > Is it? I think that file is being installed in the same way. Could it be the
> > RTEMS target config has a different list?
>
> Ah yes, my mistake, libstdc++ creates
> $target/include/x86_64-pc-linux-gnu/bits/gthr.h
>
> I thought we found that in $target/libgcc/ instead, but in fact we process
> the libgcc/gthr.h header using sed and create our own version.
>
> That means it's definitely *not* the same way as the other headers, because
> the others are symlinks into the source tree.
>
> Please clarify exactly what your current failure is.
This is the current failure, it varies on the file that it fails on:
In file included from
/Users/chris/development/rtems/rsb/rtems-source-builder.git/rtems/build/sparc-rtems5-gcc-7.3.0-newlib-d13c84eb07e35984bf7a974cd786a6cdac29e6b9-x86_64-apple-darwin18.0.0-1/gcc-7.3.0/libstdc++-v3/libsupc++/exception:143:0,
from ../../../../gcc-7.3.0/libstdc++-v3/libsupc++/new:40,
from
../../../../gcc-7.3.0/libstdc++-v3/libsupc++/bad_alloc.cc:26:
/Users/chris/development/rtems/rsb/rtems-source-builder.git/rtems/build/sparc-rtems5-gcc-7.3.0-newlib-d13c84eb07e35984bf7a974cd786a6cdac29e6b9-x86_64-apple-darwin18.0.0-1/build/sparc-rtems5/libstdc++-v3/include/bits/nested_exception.h:40:10:
fatal error: bits/move.h: No such file or directory
#include <bits/move.h>
^~~~~~~~~~~~~
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Subject: [Bug libstdc++/81797] gcc 7.1.0 fails to build on macOS 10.13 (High Sierra):
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--- Comment #70 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Drat, that is one of the symlinked files.
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From: "schuchart at hlrs dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87452] New: decltype ignores namespace in trailing return type
Date: Thu, 27 Sep 2018 13:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87452
Bug ID: 87452
Summary: decltype ignores namespace in trailing return type
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
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Priority: P3
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Created attachment 44758
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44758&action=edit
Test case
It appears that GCC does not include the namespace in the evaluations of
expressions passed to decltype() in trailing return type definitions.
The attached test-case compiled with GCC 8.2.0 produces the following output:
$ g++-8 gcc_decltype_ret.cc
$ ./a.out
10
fall-back
$ g++-8 --version
g++-8 (Ubuntu 8.2.0-1ubuntu2~18.04) 8.2.0
]]
Compiling with Clang 6.0.1 on the other hand gives the following output:
$ clang++-6.0 gcc_decltype_ret.cc
$ ./a.out
10
0 0 0 0 0 0 0 0 0 0
In other parts of the code, the same decltype() statement that is used in the
trailing return type definition yields the expected type (line 26).
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Subject: [Bug sanitizer/87453] New: Maybe implement -fsanitize=float-cast-overflow and -fsanitize=float-divide-by-zero
Date: Thu, 27 Sep 2018 13:26:00 -0000
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Bug ID: 87453
Summary: Maybe implement -fsanitize=float-cast-overflow and
-fsanitize=float-divide-by-zero
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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Priority: P3
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Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
jakub at gcc dot gnu.org, kcc at gcc dot gnu.org,
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That are UBSAN features that LLVM can instrument.
What do you think about it?
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Subject: [Bug sanitizer/80998] Implement -fsanitize=pointer-overflow
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--- Comment #8 from Martin Liška <marxin at gcc dot gnu.org> ---
Jakub, can we close this?
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Subject: [Bug sanitizer/87453] Maybe implement -fsanitize=float-cast-overflow and -fsanitize=float-divide-by-zero
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Explanation of the options.
- ``-fsanitize=float-cast-overflow``: Conversion to, from, or
between floating-point types which would overflow the
destination.
- ``-fsanitize=float-divide-by-zero``: Floating point division by
zero.
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Subject: [Bug sanitizer/87454] New: Maybe implement -fsanitize=implicit-integer-truncation
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87454
Bug ID: 87454
Summary: Maybe implement -fsanitize=implicit-integer-truncation
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: sanitizer
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
jakub at gcc dot gnu.org, kcc at gcc dot gnu.org,
marxin at gcc dot gnu.org, mpolacek at gcc dot gnu.org
Target Milestone: ---
It's new in LLVM 7.0.0:
- ``-fsanitize=implicit-integer-truncation``: Implicit conversion from
integer of larger bit width to smaller bit width, if that results in data
loss. That is, if the demoted value, after casting back to the original
width, is not equal to the original value before the downcast.
Issues caught by this sanitizer are not undefined behavior,
but are often unintentional.
Example:
unsigned char store = 0;
bool consume(unsigned int val);
void test(unsigned long val) {
if (consume(val)) // the value may have been silently truncated.
store = store + 768; // before addition, 'store' was promoted to int.
(void)consume((unsigned int)val); // OK, the truncation is explicit.
}
>From gcc-bugs-return-616468-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 13:59:13 2018
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Subject: [Bug c++/87452] decltype ignores namespace in trailing return type
Date: Thu, 27 Sep 2018 14:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87452
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-27
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced:
extern "C" int puts(const char*);
struct vector { };
namespace N {
/**
* Write range of random access iterators to output stream.
*/
void
operator+(const vector&)
{
puts("pass");
}
template<typename T>
auto
f(const T& t)
-> decltype(operator+(t)) // OK
{
return (+t);
}
template<typename T>
auto
g(const T& t)
-> decltype(+t) // fails to find operator defined in N::
{
return (+t);
}
} // namespace N
int main()
{
vector vec;
N::f(vec);
N::g(vec);
}
87452.cc: In function 'int main()':
87452.cc:38:11: error: no matching function for call to 'g(vector&)'
38 | N::g(vec);
| ^
87452.cc:26:1: note: candidate: 'template<class T> decltype (+ t) N::g(const
T&)'
26 | g(const T& t)
| ^
87452.cc:26:1: note: template argument deduction/substitution failed:
87452.cc: In substitution of 'template<class T> decltype (+ t) N::g(const T&)
[with T = vector]':
87452.cc:38:11: required from here
87452.cc:27:13: error: no match for 'operator+' (operand type is 'const
vector')
27 | -> decltype(+t) // fails to find operator defined in N::
| ^~
As the call to N::f(t) shows, the decltype in the trailing-return-type works OK
if using function call syntax (to call either a named function or the
operator-function-id). It only fails to find the overloaded operator in the
enclosing namespace for operator syntax, i.e. decltype(+t).
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Subject: [Bug c++/87452] decltype ignores namespace in trailing return type
Date: Thu, 27 Sep 2018 14:05:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87452
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced a bit more:
struct vector { };
namespace N {
void operator+(const vector&) { }
template<typename T>
auto
f(const T& t)
-> decltype(operator+(t)) // OK
{
return (+t);
}
template<typename T>
auto
g(const T& t)
-> decltype(+t) // fails to find operator defined in N::
{
return (+t);
}
} // namespace N
int main()
{
vector vec;
N::f(vec);
N::g(vec);
}
It works if struct vector and the operator+ overload are in the same namespace,
suggesting the operator can found via ADL, but normal lookup seems to not
consider namespace N.
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Subject: [Bug debug/87451] FAIL: gcc.dg/debug/dwarf2/inline5.c
Date: Thu, 27 Sep 2018 14:11:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug debug/87440] GCC creates debug that confuses gdb
Date: Thu, 27 Sep 2018 14:11:00 -0000
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Sep 27 14:10:45 2018
New Revision: 264667
URL: https://gcc.gnu.org/viewcvs?rev=264667&root=gcc&view=rev
Log:
2018-09-27 Richard Biener <rguenther@suse.de>
PR debug/37801
PR debug/87440
* dwarf2out.c (set_block_origin_self): Do not mark outermost
block as we do not output that.
(gen_inlined_subroutine_die): Elide the originally outermost
block, matching what we do for concrete instances.
(decls_for_scope): Add parameter specifying whether to recurse
to subblocks.
* gcc.dg/debug/dwarf2/inline2.c: Adjust.
* gcc.dg/debug/dwarf2/inline4.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/debug/dwarf2/inline4.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/dwarf2out.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/debug/dwarf2/inline2.c
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Subject: [Bug debug/87451] FAIL: gcc.dg/debug/dwarf2/inline5.c
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Rainer Orth <ro at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|aarch64, arm |aarch64,
| |arm,sparc-sun-solaris2.*,i3
| |86-pc-solaris2.*
CC| |ro at gcc dot gnu.org
Summary|FAIL: |FAIL:
|gcc.dg/debug/dwarf2/inline5 |gcc.dg/debug/dwarf2/inline5
|.c on aarch64 and arm |.c
--- Comment #3 from Rainer Orth <ro at gcc dot gnu.org> ---
The test also FAILs on Solaris/SPARC and x86 with /bin/as, which have different
comment signs:
x86:
.byte 0x6 / uleb128 0x6; (DIE (0x160) DW_TAG_lexical_block)
.byte 0xc / uleb128 0xc; (DIE (0x19f) DW_TAG_lexical_block)
.byte 0x6 / uleb128 0x6; (DIE (0x1c3) DW_TAG_lexical_block)
.byte 0xb / uleb128 0xb; (TAG: DW_TAG_lexical_block)
.byte 0xb / uleb128 0xb; (TAG: DW_TAG_lexical_block)
sparc:
.byte 0x6 ! uleb128 0x6; (DIE (0x14c) DW_TAG_lexical_block)
.byte 0xc ! uleb128 0xc; (DIE (0x18b) DW_TAG_lexical_block)
.byte 0x6 ! uleb128 0x6; (DIE (0x1b0) DW_TAG_lexical_block)
.byte 0xb ! uleb128 0xb; (TAG: DW_TAG_lexical_block)
.byte 0xb ! uleb128 0xb; (TAG: DW_TAG_lexical_block)
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Subject: [Bug debug/37801] DWARF output for inlined functions doesn't always use DW_TAG_inlined_subroutine
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--- Comment #14 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Sep 27 14:10:45 2018
New Revision: 264667
URL: https://gcc.gnu.org/viewcvs?rev=264667&root=gcc&view=rev
Log:
2018-09-27 Richard Biener <rguenther@suse.de>
PR debug/37801
PR debug/87440
* dwarf2out.c (set_block_origin_self): Do not mark outermost
block as we do not output that.
(gen_inlined_subroutine_die): Elide the originally outermost
block, matching what we do for concrete instances.
(decls_for_scope): Add parameter specifying whether to recurse
to subblocks.
* gcc.dg/debug/dwarf2/inline2.c: Adjust.
* gcc.dg/debug/dwarf2/inline4.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/debug/dwarf2/inline4.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/dwarf2out.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/debug/dwarf2/inline2.c
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Subject: [Bug debug/87451] FAIL: gcc.dg/debug/dwarf2/inline5.c
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--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Thu Sep 27 14:17:52 2018
New Revision: 264668
URL: https://gcc.gnu.org/viewcvs?rev=264668&root=gcc&view=rev
Log:
2018-09-27 Richard Biener <rguenther@suse.de>
PR testsuite/87451
* gcc.dg/debug/dwarf2/inline5.c: Deal with different comment
characters.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/debug/dwarf2/inline5.c
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Subject: [Bug debug/87440] GCC creates debug that confuses gdb
Date: Thu, 27 Sep 2018 14:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87440
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Known to work| |9.0
Resolution|--- |FIXED
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk.
>From gcc-bugs-return-616476-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 14:56:39 2018
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From: "amonakov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/87453] Maybe implement -fsanitize=float-cast-overflow and -fsanitize=float-divide-by-zero
Date: Thu, 27 Sep 2018 15:34:00 -0000
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |amonakov at gcc dot gnu.org
--- Comment #2 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
These two seem a bit too specific. They are also not undefined behavior (just
like unsigned integer overflow is not).
I imagine what people would rather want is a way to detect floating point
operations resulting in a NaN or infinity, i.e.
- -fsanitize=float-nan-result
- -fsanitize=float-nonfinite-result
Doing that via instrumentation would have some overhead though. Today people
can partially achieve that with zero overhead by enabling FPU exceptions, but
it's not so trivial when some exceptions are produced in third-party code (but
you don't want to trap on them).
Is there information on why Clang implemented those two options, was there
significant demand for those kinds specifically?
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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Thu, 27 Sep 2018 15:57:00 -0000
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--- Comment #26 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
On Thu, 27 Sep 2018, vincent-gcc at vinc17 dot net wrote:
> > The interpretation of C99 rules for excess precision used in GCC has been
> > explained at length from 2008 onwards.
>
> Could you cite where this bug is documented in GCC?
The general explanation of the choices made in the cases where C99 was
less than optimally clear is in
<https://gcc.gnu.org/ml/gcc-patches/2008-11/msg00105.html>, the original
addition of support for -fexcess-precision=standard.
The part of this issue that I consider a bug (i.e. the case of C11 and
later modes, the default being -std=gnu17, so if someone just uses
-fexcess-precision=standard in the default mode they'll get the C11
semantics) is fixed for GCC 9.
>From gcc-bugs-return-616478-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 15:57:41 2018
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From: "fanael4 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87455] New: sse_packed_single_insn_optimal is suboptimal on Zen
Date: Thu, 27 Sep 2018 15:59:00 -0000
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Bug ID: 87455
Summary: sse_packed_single_insn_optimal is suboptimal on Zen
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GCC by default enables -mtune-ctrl=sse_packed_single_insn_optimal on
-mtune=znver1, even though that microarchitecture doesn't like it for the same
reason Intel's microarchitectures don't: there's additional latency for domain
crossing operations, using e.g. xorps for integer data costs one cycle more
than using pxor.
Example code:
#include <immintrin.h>
int main() {
auto x = _mm_setr_epi32(1, 2, 3, 4);
auto y = _mm_setr_epi32(5, 6, 7, 8);
auto z = _mm_setr_epi32(9, 10, 11, 12);
for(int i = 0; i < 1000000000; ++i) {
x = _mm_add_epi32(x, y);
y = _mm_xor_si128(y, z);
z = _mm_add_epi32(z, x);
x = _mm_xor_si128(x, y);
y = _mm_add_epi32(y, z);
z = _mm_xor_si128(z, x);
}
asm volatile("" :: "m"(x), "m"(y), "m"(z));
}
Compiled with GCC 8.2, with -O3 -mtune=znver1 running it yields the following
perf counters:
$ perf stat -e task-clock,cycles,instructions ./a.out
Performance counter stats for './a.out':
1 193,69 msec task-clock:u # 0,989 CPUs utilized
4 040 330 384 cycles:u # 3386697,723 GHz
10 002 005 027 instructions:u # 2,48 insn per cycle
1,206801245 seconds time elapsed
1,190625000 seconds user
0,003995000 seconds sys
However, the code compiled with -O3 -mtune=znver1
-mtune-ctrl=^sse_packed_single_insn_optimal is significantly faster:
$ perf stat -e task-clock,cycles,instructions ./a.out
Performance counter stats for './a.out':
894,08 msec task-clock:u # 0,998 CPUs utilized
3 012 492 242 cycles:u # 3369678,123 GHz
10 002 004 492 instructions:u # 3,32 insn per cycle
0,895728255 seconds time elapsed
0,894688000 seconds user
0,000000000 seconds sys
This is on a Ryzen 5 2500U.
>From gcc-bugs-return-616479-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 15:59:06 2018
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From: "dcb314 at hotmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/86946] ice: canonical types differ for identical types
Date: Thu, 27 Sep 2018 16:00:00 -0000
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--- Comment #3 from David Binderman <dcb314 at hotmail dot com> ---
Problem seems to exist sometime before revision 247000,
dated 2017-04-19.
>From gcc-bugs-return-616480-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 16:00:04 2018
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From: "fanael4 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87455] sse_packed_single_insn_optimal is suboptimal on Zen
Date: Thu, 27 Sep 2018 16:27:00 -0000
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--- Comment #1 from Fanael <fanael4 at gmail dot com> ---
Assembly diff between the two:
--- /dev/fd/63 2018-09-27 17:59:06.120507763 +0200
+++ /dev/fd/62 2018-09-27 17:59:06.120507763 +0200
@@ -7,21 +7,21 @@
main:
.LFB5179:
.cfi_startproc
- movaps .LC0(%rip), %xmm0
- movaps .LC1(%rip), %xmm1
+ movdqa .LC0(%rip), %xmm0
+ movdqa .LC1(%rip), %xmm1
movl $1000000000, %eax
- movaps .LC2(%rip), %xmm2
+ movdqa .LC2(%rip), %xmm2
.p2align 4,,15
.L2:
paddd %xmm2, %xmm1
- xorps %xmm0, %xmm2
+ pxor %xmm0, %xmm2
decl %eax
paddd %xmm1, %xmm0
- movaps %xmm2, %xmm3
- xorps %xmm2, %xmm1
+ movdqa %xmm2, %xmm3
+ pxor %xmm2, %xmm1
paddd %xmm0, %xmm3
- xorps %xmm1, %xmm0
- movaps %xmm3, %xmm2
+ pxor %xmm1, %xmm0
+ movdqa %xmm3, %xmm2
jne .L2
movaps %xmm3, -40(%rsp)
movaps %xmm1, -56(%rsp)
>From gcc-bugs-return-616481-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 16:27:44 2018
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From: "vincent-gcc at vinc17 dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Thu, 27 Sep 2018 17:24:00 -0000
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--- Comment #27 from Vincent Lefèvre <vincent-gcc at vinc17 dot net> ---
(In reply to joseph@codesourcery.com from comment #26)
> The general explanation of the choices made in the cases where C99 was
> less than optimally clear is in
> <https://gcc.gnu.org/ml/gcc-patches/2008-11/msg00105.html>, the original
> addition of support for -fexcess-precision=standard.
This is not visible by the end user. The decision made for -std=c99 should
really be documented in the GCC manual (in Section 4.6 Floating Point), in
particular as this is the only exception and yields different results for
similar code (e.g. the last two cases in my example). This is made worse by the
fact that -Wfloat-conversion does not warn (bug 87447).
>From gcc-bugs-return-616482-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 17:24:57 2018
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From: "aaron.ballman+gcc at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87456] New: Attributes on a global empty statement
Date: Thu, 27 Sep 2018 17:49:00 -0000
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Bug ID: 87456
Summary: Attributes on a global empty statement
Product: gcc
Version: 9.0
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Severity: normal
Priority: P3
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GCC rejects the following valid program:
```
[[]];
int main() {}
```
with the error "declaration does not declare anything" on the attribute.
However, this is a valid attribute-declaration and should be accepted.
https://godbolt.org/z/I_7mIg
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Subject: [Bug c/87435] "Duplicate const" warning NOT emitted from typedef in -stdÉ0
Date: Thu, 27 Sep 2018 18:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87435
Nick Desaulniers <ndesaulniers at google dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #2 from Nick Desaulniers <ndesaulniers at google dot com> ---
Ok, looks like this can be a -pedantic warning.
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From: "SebastiansPublicAddress at googlemail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87457] New: thread sanitizer false positive on virtual destructor
Date: Thu, 27 Sep 2018 18:40:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87457
Bug ID: 87457
Summary: thread sanitizer false positive on virtual destructor
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: SebastiansPublicAddress at googlemail dot com
Target Milestone: ---
Created attachment 44759
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44759&action=edit
source code to reproduce the bug
reproduce like this:
$ g++ -g -fno-omit-frame-pointer -fsanitize=undefined -fsanitize=thread -o
tsan_reproduce tsan_reproduce.cpp
$ ./tsan_reproduce
==================
WARNING: ThreadSanitizer: data race (pid=19509)
Write of size 8 at 0x7b0400000800 by thread T2:
#0 pipe <null> (libtsan.so.0+0x2f079)
#1 <null> <null> (libubsan.so.1+0x1aaed)
#2 void std::__invoke_impl<void, void (*)()>(std::__invoke_other, void
(*&&)()) /usr/include/c++/8/bits/invoke.h:60 (tsan_reproduce+0x3efc)
#3 std::__invoke_result<void (*)()>::type std::__invoke<void (*)()>(void
(*&&)()) /usr/include/c++/8/bits/invoke.h:95 (tsan_reproduce+0x38e4)
#4 decltype (__invoke((_S_declval<0ul>)()))
std::thread::_Invoker<std::tuple<void (*)()>
>::_M_invoke<0ul>(std::_Index_tuple<0ul>) /usr/include/c++/8/thread:244
(tsan_reproduce+0x569f)
#5 std::thread::_Invoker<std::tuple<void (*)()> >::operator()()
/usr/include/c++/8/thread:253 (tsan_reproduce+0x55b7)
#6 std::thread::_State_impl<std::thread::_Invoker<std::tuple<void (*)()> >
>::_M_run() /usr/include/c++/8/thread:196 (tsan_reproduce+0x554c)
#7 <null> <null> (libstdc++.so.6+0xbbafe)
Previous write of size 8 at 0x7b0400000800 by thread T1:
#0 pipe <null> (libtsan.so.0+0x2f079)
#1 <null> <null> (libubsan.so.1+0x1aaed)
#2 std::thread::_State_impl<std::thread::_Invoker<std::tuple<void (*)()> >
>::~_State_impl() /usr/include/c++/8/thread:188 (tsan_reproduce+0x54a3)
#3 <null> <null> (libstdc++.so.6+0xbbb07)
Thread T2 (tid=19512, running) created by main thread at:
#0 pthread_create <null> (libtsan.so.0+0x2be2b)
#1 std::thread::_M_start_thread(std::unique_ptr<std::thread::_State,
std::default_delete<std::thread::_State> >, void (*)()) <null>
(libstdc++.so.6+0xbbd84)
#2 main
/home/sebastian/projects/photoalbum/lib/sqdbcpp/tsan_reproduce.cpp:18
(tsan_reproduce+0x346f)
Thread T1 (tid=19511, finished) created by main thread at:
#0 pthread_create <null> (libtsan.so.0+0x2be2b)
#1 std::thread::_M_start_thread(std::unique_ptr<std::thread::_State,
std::default_delete<std::thread::_State> >, void (*)()) <null>
(libstdc++.so.6+0xbbd84)
#2 main
/home/sebastian/projects/photoalbum/lib/sqdbcpp/tsan_reproduce.cpp:17
(tsan_reproduce+0x345c)
SUMMARY: ThreadSanitizer: data race
(/usr/lib/x86_64-linux-gnu/libtsan.so.0+0x2f079) in pipe
==================
ThreadSanitizer: reported 1 warnings
My system:
$ uname -a
Linux roc-lin 4.18.0-1-amd64 #1 SMP Debian 4.18.8-1 (2018-09-18) x86_64
GNU/Linux
$ g++ --version
g++ (Debian 8.2.0-7) 8.2.0
Copyright (C) 2018 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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Subject: [Bug c++/87456] Attributes on a global empty statement
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-27
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Subject: [Bug c++/87457] thread sanitizer false positive on virtual destructor
Date: Thu, 27 Sep 2018 19:16:00 -0000
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
I think the problem is that the std::thread code in libstdc++.so isn't built
with ThreadSanitizer.
>From gcc-bugs-return-616487-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 19:16:06 2018
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Subject: [Bug c++/84423] [6/7/8/9 Regression] [concepts] ICE with invalid using declaration
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |paolo.carlini at oracle dot com
--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Mine.
>From gcc-bugs-return-616488-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 19:54:49 2018
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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/87149] ICE in extract_insn, at recog.c:2305 on ppc64le
Date: Thu, 27 Sep 2018 20:42:00 -0000
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--- Comment #9 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Thu Sep 27 19:54:09 2018
New Revision: 264675
URL: https://gcc.gnu.org/viewcvs?rev=264675&root=gcc&view=rev
Log:
rs6000: Delete many HAVE_AS_* (PR87149)
This deletes most HAVE_AS_* that determine if the assembler supports
some ISA level (and also HAVE_AS_MFPGPR and HAVE_AS_DFP).
These are not useful: we will only generate an instruction that requires
some newer ISA if the user specifically asked for it (with -mcpu=, say).
If the assembler cannot handle that, it is fine if it gives an error.
They also hurt: it increases the number of possible situations that all
need handling and all need testing. We do not handle all cases, and
obviously do not test all either.
This patch removes:
HAVE_AS_POPCNTB (power5, 2.02)
HAVE_AS_FPRND (power5+, 2.04)
HAVE_AS_CMPB (power6, 2.05)
HAVE_AS_POPCNTD (power7, 2.06)
HAVE_AS_POWER8 (power8, 2.07)
HAVE_AS_POWER9 (power9, 3.0)
HAVE_AS_DFP (power6, 2.05, server)
HAVE_AS_MFPGPR (power6x but not later, not arch)
PR target/87149
* config.in (HAVE_AS_CMPB, HAVE_AS_DFP, HAVE_AS_FPRND, HAVE_AS_MFPGPR,
HAVE_AS_POPCNTB, HAVE_AS_POPCNTD, HAVE_AS_POWER8, HAVE_AS_POWER9):
Delete, always treat as true.
* config/powerpcspe/powerpcspe.c (rs6000_option_override_internal):
Ditto. Simplify remaining code.
* config/powerpcspe/powerpcspe.h: Ditto.
* config/rs6000/rs6000.c (rs6000_option_override_internal): Ditto.
Simplify remaining code.
(rs6000_expand_builtin): Ditto.
* config/rs6000/rs6000.h: Ditto.
* configure.ac: Ditto.
* configure: Regenerate.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config.in
trunk/gcc/config/powerpcspe/powerpcspe.c
trunk/gcc/config/powerpcspe/powerpcspe.h
trunk/gcc/config/rs6000/rs6000.c
trunk/gcc/config/rs6000/rs6000.h
trunk/gcc/configure
trunk/gcc/configure.ac
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From: "mattwi at fysik dot dtu.dk" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87458] New: fma and -O3 wrong result
Date: Thu, 27 Sep 2018 20:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87458
Bug ID: 87458
Summary: fma and -O3 wrong result
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: mattwi at fysik dot dtu.dk
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Created attachment 44760
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44760&action=edit
preprocessed source
Dear developers,
I have an issue when I combine std::fma with -O3. It leads to wrong output.
I apologize if this has already been addressed somewhere.
Best regards
Matthias
COMMAND LIND
g++-7 -O3 -Wall -Wextra -mfma test.cpp -o test
OUTPUT
Need to output x to reproduce error 100
In dot u is 200 (Correct value is 93)
80000 (Correct value is 17298)
OUTPUT COMPILED WITH -O2 INSTEAD OF -O3
Need to output x to reproduce error 100
In dot u is 93 (Correct value is 93)
17298 (Correct value is 17298)
GCC INFO:
Using built-in specs.
COLLECT_GCC=g++-7
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
7.3.0-21ubuntu1~16.04' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-7
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib
--with-target-system-zlib --enable-objc-gc=auto --enable-multiarch
--disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 7.3.0 (Ubuntu 7.3.0-21ubuntu1~16.04)
PROGRAM: test.cpp
#include <iostream>
#include <array>
#include <cmath>
std::array<double, 2> create(double x)
{
std::cout << "Need to output x to reproduce error ";
std::cout << x << std::endl;
return {x,x};
}
void axpby( double alpha, const std::array<double,2>& x, double beta,
std::array<double,2>& y)
{
double tmp = beta*y[0];
y[0] = std::fma( alpha,x[0],tmp);
tmp = beta*y[1];
y[1] = std::fma( alpha,x[1],tmp);
}
double dot( const std::array<double,2>& u)
{
//we also need this output to reproduce error
std::cout << "In dot u is "<<u[0] << " (Correct value is 93)\n";
return u[0]*u[0]+u[1]*u[1];
}
int main()
{
std::array<double,2> u = {{7,7}};
axpby( 1., create(100), -1., u); //100 - 7 , 100 - 7
std::cout << dot( u)<<" (Correct value is 17298)" << std::endl;
return 0;
}
>From gcc-bugs-return-616490-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 20:54:17 2018
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Subject: [Bug tree-optimization/87458] fma and -O3 wrong result
Date: Thu, 27 Sep 2018 21:01:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Target| |aarch64-linux-gnu
| |x86_64-linux-gnu
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-27
Component|c++ |tree-optimization
Ever confirmed|0 |1
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
A negate has gone missing ...
Confirmed happens on aarch64-linux-gnu also.
>From gcc-bugs-return-616491-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 21:01:23 2018
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Subject: [Bug tree-optimization/87458] fma and -O3 wrong result
Date: Thu, 27 Sep 2018 21:31:00 -0000
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--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
- u._M_elems[0] = 7.0e+0;
- u._M_elems[1] = 7.0e+0;
+ MEM[(double *)&u] = { 7.0e+0, 7.0e+0 };
D.41349 = create (1.0e+2);
- _9 = MEM[(value_type &)&u];
- tmp_10 = -_9;
_11 = MEM[(const value_type &)&D.41349];
- _12 = _11 * 1.0e+0 + tmp_10;
- MEM[(value_type &)&u] = _12;
- _13 = MEM[(value_type &)&u + 8];
- tmp_14 = -_13;
+ vect__11.38_25 = MEM[(const value_type &)&D.41349];
_15 = MEM[(const value_type &)&D.41349 + 8];
- _16 = _15 * 1.0e+0 + tmp_14;
- MEM[(value_type &)&u + 8] = _16;
+ vect_cst__29 = {_11, _15};
+ vect__12.43_30 = vect__11.38_25 * { 1.0e+0, 1.0e+0 } + vect_cst__29;
+ MEM[(value_type &)&u] = vect__12.43_30;
It is worse, notice how _11 * 1.0e+0 + tmp_10; and _15 * 1.0e+0 + tmp_14; are
combined into:
vect_cst__29 = {_11, _15};
vect__11.38_25 * { 1.0e+0, 1.0e+0 } + vect_cst__29;
But vect_cst__29 is not {tmp_10, tmp_14} or -{_9, _13} or rather
-MEM[(value_type &)&u];
Looks like the SLP vectorizer is using operand 0 for the operand 2 which is
incorrect.
>From gcc-bugs-return-616492-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Sep 27 21:31:54 2018
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Subject: [Bug target/87033] The compiler does not generate the LWAX instruction
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--- Comment #5 from Michael Meissner <meissner at gcc dot gnu.org> ---
Author: meissner
Date: Thu Sep 27 21:31:04 2018
New Revision: 264679
URL: https://gcc.gnu.org/viewcvs?rev=264679&root=gcc&view=rev
Log:
Backport PR 87033
Added:
branches/gcc-8-branch/gcc/testsuite/gcc.target/powerpc/pr87033.c
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/config/rs6000/rs6000.md
branches/gcc-8-branch/gcc/testsuite/ChangeLog
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Subject: =?UTF-8?B?W0J1ZyBjKysvODY0NjVdIEMrKzE3IDxvcHRpb25hbD4gdHJpZ2dlcnM6IA==?= =?UTF-8?B?4oCYPGFub255bW91cz7igJkgbWF5IGJlIHVzZWQgdW5pbml0aWFsaXplZCBp?= =?UTF-8?B?biB0aGlzIGZ1bmN0aW9u?Date: Thu, 27 Sep 2018 21:53:00 -0000
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--- Comment #2 from Pavel Roskin <proski at gnu dot org> ---
Created attachment 44761
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44761&action=edit
Heavily simplified example, g++-5 compatible
I'm attaching a dumbed down version of the previous example, which compiles
with gcc 5.5.0 and newer.
gcc 5.5.0 and gcc 6.4.0 don't produce any warning. gcc 7.3.0, 8.1.0 and the
today's gcc from the git master branch all produce the warning.
That suggests that the issue is indeed related to the one described in bug
#86485.
The implementation of optional in libstdc++ 7 doesn't trigger a warning, it's
the changes in libstdc++ 8 that started triggering it. However, gcc 7 appears
to have the same compiler issue.
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Subject: [Bug target/87033] The compiler does not generate the LWAX instruction
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |7.4
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Subject: [Bug c/70477] -Wtautological-compare too aggressive?
Date: Thu, 27 Sep 2018 23:08:00 -0000
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Petr Vandrovec <petr at vandrovec dot name> changed:
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----------------------------------------------------------------------------
CC| |petr at vandrovec dot name
--- Comment #7 from Petr Vandrovec <petr at vandrovec dot name> ---
Would it be possible to special-case parameter for _Static_assert, as whole
purpose of _Static_assert is to have constant value that is non-zero?
We have in our code base code that ends up calling _Static_assert() with really
complicated constant expression.
When regular gcc is used, code compiles fine with all optimization levels, as
gcc recognizes there are complicated macros involved, and backs off. When
ccache is used, it preprocesses source in separate step, and gcc will complain
about tautological compare inside _Static_assert :-(
Would it be possible to either suppress warning when used as parameter for
_Static_assert, or remove tautological-compare warnings if -fpreprocessed is
passed to the compiler, as macro heuristics are subverted by doing
preprocessing in separate step?
Example (our code is more complicated, this is simplest example I came up
with):
$ cat test.c
#define A &a
int a;
void test(void) {
_Static_assert(&a == A, "&a must be A");
}
$ gcc -c -Wall -Werror test.c
$ gcc -c -Wall -Werror test.c -no-integrated-cpp
x.c: In function 'test':
x.c.:5:22: error: self-comparison always evaluates to true
[-Werror=tautological-compare]
_Static_assert(&a == A, "&a must be A");
cc1: all warnings being treated as errors
It happens with 8.2.0, as well as with 6.4.0.
$ gcc --version
gcc (Debian 8.2.0-6) 8.2.0
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Subject: [Bug target/87149] ICE in extract_insn, at recog.c:2305 on ppc64le
Date: Thu, 27 Sep 2018 23:11:00 -0000
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--- Comment #10 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Should be fixed on trunk now.
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Subject: [Bug target/87133] ICE in aggregate_value_p with -frounding-math on ppc64le
Date: Thu, 27 Sep 2018 23:16:00 -0000
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--- Comment #11 from Segher Boessenkool <segher at gcc dot gnu.org> ---
This should be fixed on trunk now. Martin, can you please check that?
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Subject: [Bug c++/87364] Pretty print of enumerator never prints the id, always falls back to C-style cast output
Date: Thu, 27 Sep 2018 23:46:00 -0000
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--- Comment #5 from Will Wray <wjwray at gmail dot com> ---
re: https://gcc.gnu.org/ml/gcc/2018-02/msg00009.html
discussion on removing literal suffixes from Integral constants
(part a bigger conversation I'll pick up on below).
That change brought GCC into line with clang and MSVC which both
currently output plain digits with no distinguishing type info.
Unfortunately, plain digits output fails to distinguish non-type
template Args with same values but different Integral types.
To see how this discussion relates to enumeration constants
we must distinguish non-enumerated from enumerated values.
For non-enumerated values clang and MSVC output plain digits
while GCC outputs a C-style cast* (unchanged by this patch).
For enumerated values the patch here brings GCC into line with
current clang and MSVC - all three now output enumerator ids*
(current MSVC outputs duplicate-value ids as-if non-enumerated).
(*ids and cast type are output with nested-specifier sequence.)
Clang & MSVC discussion
-----------------------
I started a thread with Clang devs about adding type info to enums:
__PRETTY_FUNCTION__ output loses enum type info for non-enumerated values
http://lists.llvm.org/pipermail/cfe-dev/2018-September/059229.html
(I also submitted a broader request to MSVC
https://developercommunity.visualstudio.com/content/problem/339663/improve-pretty-print-of-integral-non-type-template.html)
Richard Smith is open to the idea of Clang adding type info where needed.
He points out that the type info is only needed for deduced arguments,
which I interpret to mean 'auto' in C++17 but can be concept in C++20.
He singles out enum printing as a case where it may be OK to always print
the type, arguing that implicit conversion from integer is not allowed.
Mr Smith expanded the thread to cover -
General non-type template arguments: Integral constants and more
-----------------------------------
Picking up here on the bigger conversation, which really belongs elsewhere.
In the linked thread https://gcc.gnu.org/ml/gcc/2018-02/msg00030.html
Martin Sebor:
For auto, since it's new, a viable alternative might be to
standardize the debug info format so that eventually all
producers will converge on it. But even that approach won't
help users of existing compilers.
C++20 generalises template non-type arguments to include LiteralType
https://en.cppreference.com/w/cpp/language/template_parameters
I doubt anyone considered yet what this means for debug info.
How do you pretty-print a general non-scalar non-type Arg constant?
Implementations will have to deal with this somehow (or ignore it).
Without consensus we'll get greater divergence.
This provides motivation NOW to discuss a general standard format.
While this is outside the remit of the C++ standards process
requirements for debug info / pretty-print should feed back to it.
For instance, it'd be useful for non-type Args to have a unique,
canonical constructor, akin to aggregate initialization perhaps.
Where best to pick up this discussion towards standard debug info?
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Subject: [Bug c/70477] -Wtautological-compare too aggressive?
Date: Thu, 27 Sep 2018 23:49:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |msebor at gcc dot gnu.org
--- Comment #8 from Martin Sebor <msebor at gcc dot gnu.org> ---
A cast suppresses the warning so that might be a solution (or a workaround) in
the _Static_assert case:
_Static_assert ((void*)&a == (void*)A, "&a must be A");
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Subject: [Bug target/87033] The compiler does not generate the LWAX instruction
Date: Fri, 28 Sep 2018 00:33:00 -0000
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--- Comment #6 from Michael Meissner <meissner at gcc dot gnu.org> ---
Author: meissner
Date: Fri Sep 28 00:32:46 2018
New Revision: 264686
URL: https://gcc.gnu.org/viewcvs?rev=264686&root=gcc&view=rev
Log:
Backport pr 87033 to gcc 7
Added:
branches/gcc-7-branch/gcc/testsuite/gcc.target/powerpc/pr87033.c
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/config/rs6000/rs6000.md
branches/gcc-7-branch/gcc/testsuite/ChangeLog
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Subject: [Bug c/87447] Missing -Wconversion warning in implicit conversion of unsigned long long to double
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Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-27
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--- Comment #1 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
C++ warns:
<source>:5:3: warning: conversion from 'long long unsigned int' to 'double'
changes value from '9223372036854775809' to '9.2233720368547758e+18'
[-Wfloat-conversion]
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Subject: [Bug target/87195] ICE in simplify_binary_operation_1, at simplify-rtx.c:3637
Date: Fri, 28 Sep 2018 00:46:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Fixed with r264584.
*** This bug has been marked as a duplicate of bug 86987 ***
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Subject: [Bug target/87033] The compiler does not generate the LWAX instruction
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Michael Meissner <meissner at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #7 from Michael Meissner <meissner at gcc dot gnu.org> ---
Fixed in the trunk, gcc 8, and gcc 7 branches.
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Subject: [Bug target/86987] ICE in simplify_binary_operation_1, at simplify-rtx.c:3515 on ppc64le
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--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
*** Bug 87195 has been marked as a duplicate of this bug. ***
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Subject: [Bug target/86684] ICE in extract_insn, at recog.c:2304 on ppc64le
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86684
Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #14 from Segher Boessenkool <segher at gcc dot gnu.org> ---
I'm closing this as fixed. Please reopen if you want a backport (of the
#c13 part). Thanks!
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From: "m.diehl at mpie dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/87459] New: -Wunused-variable: False positive for associated variables
Date: Fri, 28 Sep 2018 06:24:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87459
Bug ID: 87459
Summary: -Wunused-variable: False positive for associated
variables
Product: gcc
Version: 8.2.1
Status: UNCONFIRMED
Keywords: diagnostic
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: m.diehl at mpie dot de
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: x86_64-pc-linux-gnu
Warning messages about unused variables (-Wunused-variable) appear wrongly when
associate is used (false positive):
pprogram test
implicit none
real :: a = 5
real :: b
associate(b => a)
write(6,*) b
end associate
end program
gives
Warning: Unused variable ‘b’ declared at (1) [-Wunused-variable]
when complied with -Wunused-variable
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Subject: [Bug fortran/71798] [OOP] failure to finalise temporary
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Jürgen Reuter <juergen.reuter at desy dot de> changed:
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--- Comment #2 from Jürgen Reuter <juergen.reuter at desy dot de> ---
Still present in actual trunk.
>From gcc-bugs-return-616508-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 28 06:27:39 2018
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Subject: [Bug fortran/65347] [F03] Final subroutine not called for function result
Date: Fri, 28 Sep 2018 06:33:00 -0000
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Jürgen Reuter <juergen.reuter at desy dot de> changed:
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--- Comment #2 from Jürgen Reuter <juergen.reuter at desy dot de> ---
Also still present in trunk.
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Subject: [Bug tree-optimization/87458] fma and -O3 wrong result
Date: Fri, 28 Sep 2018 06:51:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I suspect this has been fixed already and is a duplicate of bug 85597.
*** This bug has been marked as a duplicate of bug 85597 ***
>From gcc-bugs-return-616509-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 28 06:33:29 2018
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From: "juergen.reuter at desy dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/70863] [F03] Finalization of array of derived type causes segfault
Date: Fri, 28 Sep 2018 06:51:00 -0000
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Jürgen Reuter <juergen.reuter at desy dot de> changed:
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CC| |juergen.reuter at desy dot de
--- Comment #4 from Jürgen Reuter <juergen.reuter at desy dot de> ---
Is this code posted October 28 on c.l.f. another incarnation of the same
problem?
module third_party_library
type foo
integer, pointer :: f(:) => null()
contains
final :: foo_destroy
end type
contains
impure elemental subroutine foo_destroy(this)
type(foo), intent(inout) :: this
print *, "foo"
if (associated(this%f)) deallocate(this%f)
end subroutine
end module
module my_code
use third_party_library
type bar
type(foo) :: b(2)
end type
end module
program main
use my_code
type(bar) :: x
call sub(x)
contains
subroutine sub(x)
type(bar), intent(out) :: x
end subroutine
end program
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Subject: [Bug tree-optimization/85597] [6 Regression] internal compiler error: in compute_live_loop_exits, at tree-ssa-loop-manip.c:229
Date: Fri, 28 Sep 2018 07:08:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |mattwi at fysik dot dtu.dk
--- Comment #10 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 87458 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-616512-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 28 07:08:33 2018
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From: "janus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/87460] New: [F03] accepts-invalid bug with ASSOCIATE and array argument
Date: Fri, 28 Sep 2018 07:50:00 -0000
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Bug ID: 87460
Summary: [F03] accepts-invalid bug with ASSOCIATE and array
argument
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
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Target Milestone: ---
program p
implicit none
integer, dimension(1:9) :: nine
call sub(nine(1:6)) ! Error: Actual argument contains too few elements
associate(six => nine(1:6))
call sub(six) ! no error here
end associate
contains
subroutine sub(arg)
integer, dimension(1:9) :: arg
end subroutine
end
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Subject: [Bug fortran/86119] [8/9 Regression] Intrinsic len has wrong type if used within select type for a class(*) string
Date: Fri, 28 Sep 2018 08:31:00 -0000
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--- Comment #4 from Janne Blomqvist <jb at gcc dot gnu.org> ---
(In reply to janus from comment #3)
> (In reply to Dominique d'Humieres from comment #1)
> > Likely revision r256284.
>
> Certainly.
>
> For the code in comment 0, -fdump-tree-original shows:
>
> l2 = (integer(kind=4)) s._len;
>
> Apparently the _len component of the class container has kind=8.
>
> The following patch manages to remove the conversion warning:
>
>
> diff --git a/gcc/fortran/class.c b/gcc/fortran/class.c
> index 2eae7f0f351..cbc2c72ae3f 100644
> --- a/gcc/fortran/class.c
> +++ b/gcc/fortran/class.c
> @@ -709,7 +709,7 @@ gfc_build_class_symbol (gfc_typespec *ts,
> symbol_attribute *attr,
> if (!gfc_add_component (fclass, "_len", &c))
> return false;
> c->ts.type = BT_INTEGER;
> - c->ts.kind = gfc_charlen_int_kind;
> + c->ts.kind = gfc_default_integer_kind;
> c->attr.access = ACCESS_PRIVATE;
> c->attr.artificial = 1;
> }
This is, AFAICS, almost certainly wrong as it breaks the class layout ABI, as
well as handling of long strings.
> However, instead of this, we should rather insert an explicit conversion to
> get rid of the warning, I think.
Yes, LEN(s) is defined to return a value of default kind, so the right approach
is to figure out how to silence the warning.
(In reply to Dominique d'Humieres from comment #1)
> Likely revision r256284.
>
> kind(len(s)) is 8 in this context, but
To be clear, as mentioned above, without the optional KIND= argument, the LEN
intrinsic is defined to return a value of default kind. So the result of the
above expression should be 4. Now, you're correct (and perhaps that's what you
intended to say?) that the underlying length value is stored as a kind=C_SIZE_T
variable here.
> character(len=5) :: s
> print *, kind(len(s))
> end
>
> gives 4.
To clarify, in a situation like this, the length value associated with 's' is
the kind given. So here the length is stored as a default kind integer. For,
say,
character(len=5_16) :: s
the length value is stored as a kind=16 integer. When calling procedures, or
in class'es etc. where the kind matters for ABI reasons it's converted to
kind=C_SIZE_T
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Subject: [Bug debug/87451] FAIL: gcc.dg/debug/dwarf2/inline5.c
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Rainer Orth <ro at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |REOPENED
Resolution|FIXED |---
--- Comment #6 from Rainer Orth <ro at gcc dot gnu.org> ---
Unfortunately, while the previous failures are gone on Solaris, I've got two
new
ones now:
FAIL: gcc.dg/debug/dwarf2/inline5.c scan-assembler-not \\\\(DIE
\\\\(0x([0-9a-f]*)\\\\) DW_TAG_lexical_block\\\\)[^#/!]*[#/!]
[^(].*DW_TAG_lexical_block\\\\)[^#/!x]*x\\\\1[^#/!]*[#/!] DW_AT_abstract_origin
FAIL: gcc.dg/debug/dwarf2/inline5.c scan-assembler-times
DW_TAG_lexical_block\\\\)[^#/!]*[#/!] \\\\(DIE \\\\(0x[0-9a-f]*\\\\)
DW_TAG_variable 1
Again, both 32 and 64-bit sparc and x86.
The latter seems to be due to the fact that the Solaris assemblers don't
support
.uleb, so we have
x86:
.byte 0xc / uleb128 0xc; (DIE (0x19f) DW_TAG_lexical_block)
.byte 0xd / uleb128 0xd; (DIE (0x1a0) DW_TAG_variable)
sparc:
.byte 0xc ! uleb128 0xc; (DIE (0x18b) DW_TAG_lexical_block)
.byte 0xd ! uleb128 0xd; (DIE (0x18c) DW_TAG_variable)
which needs to be accounted for.
The former is probably caused by Tcl doing multiline matches by default, so
"." in a regex also matches newline.
I'm attaching the sparc and x86 assembler output for reference.
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Subject: [Bug libstdc++/78113] std::variant and std::visit's current implementations do not get optimized out (compared to "recursive visitation")
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Nir Friedman <quicknir at gmail dot com> changed:
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----------------------------------------------------------------------------
CC| |quicknir at gmail dot com
--- Comment #3 from Nir Friedman <quicknir at gmail dot com> ---
I noticed this issue independently recently, and in fact just mentioned it in
my cppcon presentation.
I think the optimal implementation is to do switch case on the index as a
special case when there is only one variant of up to N types (suggested value
N=10) passed to visit. Whatever the boost implementation is (someone mentioned
recursive if?), I do not think it is optimal. On the other hand, switch case
optimizes well: https://gcc.godbolt.org/z/ysKr5s. Note that clang with libc++
yields basically the same results. Also note the optimal assembly for Antony's
example.
I'm willing to write the implementation (basically, use a switch case for a
single visitor of up to 10 types and fall back to previous implementation
otherwise) if there's interest in this approach, or otherwise I'd be curious if
there are any objections to it. I also plan to approach clang and MSVC library
maintainers.
One final thing to note: even if gcc/clang get to the point that they can
inline the function pointers and get a jump table, that still won't really be
as fast as switch case. Switch case for instance won't typically turn into a
jump table for 2-3 options, presumably that's because the compiler thinks it's
actually faster to branch. It's unlikely that you'd see the same
transformations from an array of function pointers. Bottom line is that switch
case seems to give the compiler the most information, has the most man-years of
optimization behind it, so to me it makes a lot of sense to optimize variant by
using it for the common case.
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sparc-sun-solaris2.11 -m32 inline5.s
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Subject: [Bug libstdc++/78113] std::variant and std::visit's current implementations do not get optimized out (compared to "recursive visitation")
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-28
Ever confirmed|0 |1
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Subject: [Bug web/87461] New: Web site should use a responsive template
Date: Fri, 28 Sep 2018 09:33:00 -0000
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Bug ID: 87461
Summary: Web site should use a responsive template
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If the GCC website is viewed on a small screen device, such as a mobile phone,
then the entire page is scaled as-is until it will fit the width of the device.
This makes it unreadable.
Good modern web pages use responsive templates so that when the screen
real-estate is low, a simplified layout can be used that is more appropriate to
the size of the display.
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Subject: [Bug c++/87462] New: undefined reference error occurs when -g, -fdebug-types-section and -O2 are used at the same time
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Bug ID: 87462
Summary: undefined reference error occurs when -g,
-fdebug-types-section and -O2 are used at the same
time
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
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$ cat TestWrapper.cc
class Test1 {
public:
static int testFunc() { return 1; }
};
template <typename T,
T (*funcImpl)()>
class TestWrapper {
public:
static T func() { return (*funcImpl)(); }
};
int main() {
return TestWrapper<int, &Test1::testFunc>::func();
}
$
This error occurs when -g, -fdebug-types-section and -O2 are used at the same
time. It does not occur if one of them is unused.
$ gcc-7 -g -O2 -fdebug-types-section TestWrapper.cc
/tmp/ccu7NjIe.o:(.debug_types[wt.96b188ce15e36354]+0x53): undefined reference
to `Test1::testFunc()'
collect2: error: ld returned 1 exit status
$ gcc-7 -g -O2 TestWrapper.cc
$
$ gcc-7 -g -O2 -fdebug-types-section TestWrapper.cc -v -save-temps
Using built-in specs.
COLLECT_GCC=gcc-7
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
OFFLOAD_TARGET_NAMES=nvptx-none
OFFLOAD_TARGET_DEFAULT=1
Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Ubuntu
7.3.0-21ubuntu1~16.04' --with-bugurl=file:///usr/share/doc/gcc-7/README.Bugs
--enable-languages=c,ada,c++,go,brig,d,fortran,objc,obj-c++ --prefix=/usr
--with-gcc-major-version-only --program-suffix=-7
--program-prefix=x86_64-linux-gnu- --enable-shared --enable-linker-build-id
--libexecdir=/usr/lib --without-included-gettext --enable-threads=posix
--libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu
--enable-libstdcxx-debug --enable-libstdcxx-time=yes
--with-default-libstdcxx-abi=new --enable-gnu-unique-object
--disable-vtable-verify --enable-libmpx --enable-plugin --with-system-zlib
--with-target-system-zlib --enable-objc-gc=auto --enable-multiarch
--disable-werror --with-arch-32=i686 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-offload-targets=nvptx-none --without-cuda-driver
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 7.3.0 (Ubuntu 7.3.0-21ubuntu1~16.04)
COLLECT_GCC_OPTIONS='-g' '-O2' '-fdebug-types-section' '-v' '-save-temps'
'-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/7/cc1plus -E -quiet -v -imultiarch
x86_64-linux-gnu -D_GNU_SOURCE TestWrapper.cc -mtune=generic -march=x86-64
-fdebug-types-section -g -fworking-directory -O2 -fpch-preprocess
-fstack-protector-strong -Wformat -Wformat-security -o TestWrapper.ii
ignoring duplicate directory "/usr/include/x86_64-linux-gnu/c++/7"
ignoring nonexistent directory "/usr/local/include/x86_64-linux-gnu"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-linux-gnu/7/../../../../x86_64-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/include/c++/7
/usr/include/x86_64-linux-gnu/c++/7
/usr/include/c++/7/backward
/usr/lib/gcc/x86_64-linux-gnu/7/include
/usr/local/include
/usr/lib/gcc/x86_64-linux-gnu/7/include-fixed
/usr/include/x86_64-linux-gnu
/usr/include
End of search list.
COLLECT_GCC_OPTIONS='-g' '-O2' '-fdebug-types-section' '-v' '-save-temps'
'-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/7/cc1plus -fpreprocessed TestWrapper.ii -quiet
-dumpbase TestWrapper.cc -mtune=generic -march=x86-64 -auxbase TestWrapper -g
-O2 -version -fdebug-types-section -fstack-protector-strong -Wformat
-Wformat-security -o TestWrapper.s
GNU C++14 (Ubuntu 7.3.0-21ubuntu1~16.04) version 7.3.0 (x86_64-linux-gnu)
compiled by GNU C version 7.3.0, GMP version 6.1.0, MPFR version 3.1.4,
MPC version 1.0.3, isl version isl-0.16.1-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
GNU C++14 (Ubuntu 7.3.0-21ubuntu1~16.04) version 7.3.0 (x86_64-linux-gnu)
compiled by GNU C version 7.3.0, GMP version 6.1.0, MPFR version 3.1.4,
MPC version 1.0.3, isl version isl-0.16.1-GMP
GGC heuristics: --param ggc-min-expand=100 --param ggc-min-heapsize=131072
Compiler executable checksum: 612ffb48244e46eb953b6d77363adac8
COLLECT_GCC_OPTIONS='-g' '-O2' '-fdebug-types-section' '-v' '-save-temps'
'-mtune=generic' '-march=x86-64'
as -v --64 -o TestWrapper.o TestWrapper.s
GNU assembler version 2.26.1 (x86_64-linux-gnu) using BFD version (GNU Binutils
for Ubuntu) 2.26.1
COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/7/:/usr/lib/gcc/x86_64-linux-gnu/7/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/7/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/7/:/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/7/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/7/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-g' '-O2' '-fdebug-types-section' '-v' '-save-temps'
'-mtune=generic' '-march=x86-64'
/usr/lib/gcc/x86_64-linux-gnu/7/collect2 -plugin
/usr/lib/gcc/x86_64-linux-gnu/7/liblto_plugin.so
-plugin-opt=/usr/lib/gcc/x86_64-linux-gnu/7/lto-wrapper
-plugin-opt=-fresolution=TestWrapper.res -plugin-opt=-pass-through=-lgcc
-plugin-opt=-pass-through=-lgcc_s -plugin-opt=-pass-through=-lc
-plugin-opt=-pass-through=-lgcc -plugin-opt=-pass-through=-lgcc_s --sysroot=/
--build-id --eh-frame-hdr -m elf_x86_64 --hash-style=gnu --as-needed
-dynamic-linker /lib64/ld-linux-x86-64.so.2 -z relro
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/crt1.o
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/crti.o
/usr/lib/gcc/x86_64-linux-gnu/7/crtbegin.o -L/usr/lib/gcc/x86_64-linux-gnu/7
-L/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu
-L/usr/lib/gcc/x86_64-linux-gnu/7/../../../../lib -L/lib/x86_64-linux-gnu
-L/lib/../lib -L/usr/lib/x86_64-linux-gnu -L/usr/lib/../lib
-L/usr/lib/gcc/x86_64-linux-gnu/7/../../.. TestWrapper.o -lgcc --push-state
--as-needed -lgcc_s --pop-state -lc -lgcc --push-state --as-needed -lgcc_s
--pop-state /usr/lib/gcc/x86_64-linux-gnu/7/crtend.o
/usr/lib/gcc/x86_64-linux-gnu/7/../../../x86_64-linux-gnu/crtn.o
TestWrapper.o:(.debug_types[wt.96b188ce15e36354]+0x53): undefined reference to
`Test1::testFunc()'
collect2: error: ld returned 1 exit status
>From gcc-bugs-return-616522-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 28 10:00:59 2018
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From: "vekumar at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/87455] sse_packed_single_insn_optimal is suboptimal on Zen
Date: Fri, 28 Sep 2018 10:06:00 -0000
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--- Comment #2 from vekumar at gcc dot gnu.org ---
This tuning was intended to generate movups instead of movupd as movups is 1
byte lesser than movupd. May be we should remove xorps generation part.
>From gcc-bugs-return-616523-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 28 10:06:34 2018
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From: "thopre01 at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87156] [9 Regression] ICE building libstdc++ for mips64
Date: Fri, 28 Sep 2018 10:12:00 -0000
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Thomas Preud'homme <thopre01 at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2018-9-28
CC| |thopre01 at gcc dot gnu.org
--- Comment #2 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
Just hit it again with yesterday's trunk on the compile farm.
>From gcc-bugs-return-616524-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 28 10:12:08 2018
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Subject: [Bug target/87156] [9 Regression] ICE building libstdc++ for mips64
Date: Fri, 28 Sep 2018 10:13:00 -0000
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Jan Hubicka <hubicka at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Ever confirmed|0 |1
--- Comment #3 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Does the attached patch fix the bootstrap?
Index: cgraphclones.c
===================================================================
--- cgraphclones.c (revision 264180)
+++ cgraphclones.c (working copy)
@@ -967,6 +967,8 @@ cgraph_node::create_version_clone_with_b
SET_DECL_ASSEMBLER_NAME (new_decl, DECL_NAME (new_decl));
SET_DECL_RTL (new_decl, NULL);
+ DECL_VIRTUAL_P (new_decl) = 0;
+
/* When the old decl was a con-/destructor make sure the clone isn't. */
DECL_STATIC_CONSTRUCTOR (new_decl) = 0;
DECL_STATIC_DESTRUCTOR (new_decl) = 0;
>From gcc-bugs-return-616525-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 28 10:13:56 2018
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From: "juergen.reuter at desy dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/87359] [9 regression] pointer being freed was not allocated
Date: Fri, 28 Sep 2018 10:18:00 -0000
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--- Comment #43 from Jürgen Reuter <juergen.reuter at desy dot de> ---
I just checked that Paul's fix actually solves all problems that our code had
with the current trunk of gcc/gfortran as of r264501.
>From gcc-bugs-return-616526-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 28 10:18:53 2018
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/87462] [7/8/9 Regression] undefined reference error occurs when -g, -fdebug-types-section and -O2 are used at the same time
Date: Fri, 28 Sep 2018 10:26:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |x86_64-*-*
Priority|P3 |P2
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-28
Component|c++ |debug
Target Milestone|--- |7.4
Summary|undefined reference error |[7/8/9 Regression]
|occurs when -g, |undefined reference error
|-fdebug-types-section and |occurs when -g,
|-O2 are used at the same |-fdebug-types-section and
|time |-O2 are used at the same
| |time
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-616527-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 28 10:26:08 2018
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From: "pmatos at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug other/50582] Instruct GCC that added_clobbers_hard_reg_p shouldn't consider a specific register
Date: Fri, 28 Sep 2018 11:33:00 -0000
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pmatos at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |pmatos at gcc dot gnu.org
--- Comment #5 from pmatos at gcc dot gnu.org ---
(In reply to Eric Gallager from comment #4)
>
> Do these patches still apply against trunk? If so, please submit to
> gcc-patches for review.
They are 7 years old. Most likely they don't apply. Will have to have another
go at them.
>From gcc-bugs-return-616528-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 28 11:33:28 2018
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Subject: [Bug c++/87463] New: ICE in in tsubst_copy, at cp/pt.c:15513
Date: Fri, 28 Sep 2018 11:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87463
Bug ID: 87463
Summary: ICE in in tsubst_copy, at cp/pt.c:15513
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: larsbj at gullik dot net
Target Milestone: ---
Created attachment 44764
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44764&action=edit
Source file showing the problem
When I compile the attached code I get this ICE:
g++ -v
Using built-in specs.
COLLECT_GCC=/opt/gcc/gcc-9/bin/g++
COLLECT_LTO_WRAPPER=/opt/gcc/gcc-9/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/opt/gcc/gcc-9
--enable-checking=release --enable-languages=c,c++
Thread model: posix
gcc version 9.0.0 20180925 (experimental) (GCC)
g++ -c foo.cpp
foo.cpp: In instantiation of ‘void l() [with <template-parameter-1-1> = int]’:
foo.cpp:17:12: required from here
foo.cpp:12:5: internal compiler error: in tsubst_copy, at cp/pt.c:15513
12 | ""_a;
| ^~~~
0x59e988 tsubst_copy
../../gcc/gcc/cp/pt.c:15513
0x6d083f tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/gcc/cp/pt.c:19039
0x6cfa0c tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/gcc/cp/pt.c:18309
0x6c18dc tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:17455
0x6c1602 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16650
0x6c0bc2 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16939
0x6db708 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16621
0x6db708 instantiate_decl(tree_node*, bool, bool)
../../gcc/gcc/cp/pt.c:24099
0x6ddbd3 instantiate_pending_templates(int)
../../gcc/gcc/cp/pt.c:24215
0x63fd80 c_parse_final_cleanups()
../../gcc/gcc/cp/decl2.c:4709
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Subject: [Bug c++/87464] New: Gcc reports hard error instead of SFINAE out the related method
Date: Fri, 28 Sep 2018 12:38:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87464
Bug ID: 87464
Summary: Gcc reports hard error instead of SFINAE out the
related method
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: alexejfink at gmx dot net
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Created attachment 44765
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44765&action=edit
test code
The following code works with clang (7.x, 8.x) & VC (2015).
Trouble: GCC reports a hard error instead of SFINAE-drop the methods:
1. "tst.cpp:27:149: error: no type named ‘type’ in ‘struct
std::enable_if<false, int>’";
2. "tst.cpp:36:4: error: no type named ‘type’ in ‘struct std::enable_if<false,
SfinaeTest<int>&>’"
The clang and VC compilers do compile this places (besides the expected errors
in main())
//== sfinae_gcc_error.cpp =======================
#include <type_traits>
template<typename T>
class SfinaeTest
{
public:
SfinaeTest()
: dummy(nullptr)
{ }
SfinaeTest(const SfinaeTest& other)
: dummy(other.dummy)
{ }
SfinaeTest& operator =(const SfinaeTest& ot)
{
dummy= ot.dummy;
return *this;
}
public: // forbid non-const = const assignements
// gcc reports an error: "tst.cpp:27:149: error: no type named ‘type’ in
‘struct std::enable_if<false, int>’";
// Clang & VC do compile this constructor
template<typename TT, typename std::enable_if< std::is_same<T, const
TT>::value, int>::type = 0>
SfinaeTest(const SfinaeTest<TT>& other)
: dummy(other.dummy)
{ }
// gcc reports an error "tst.cpp:36:4: error: no type named ‘type’ in
‘struct std::enable_if<false, SfinaeTest<int>&>’"
// clang & VC do compile this method
template<typename TT>
typename std::enable_if< std::is_same<T, const TT>::value,
SfinaeTest&>::type
operator =(const SfinaeTest<TT>& ot)
{
dummy= ot.dummy;
return *this;
}
public:
T* dummy;
};
int main ()
{
typedef SfinaeTest<int> Ptr;
typedef SfinaeTest<const int> ConstPtr;
Ptr p;
ConstPtr c;
ConstPtr a_p( p); // good: non-const* -> const*
ConstPtr a_c( c); // good: const* -> const*
Ptr b_c( c); // expected error: const* -> non-const*; Extra
gcc-error: see L:25
ConstPtr c_p;
ConstPtr c_c;
Ptr d_p;
Ptr d_c;
c_p = p; // good: non-const* -> const*
c_c = c; // good: const* -> const*
d_p = p; // good: non-const* -> non-const*
d_c = c; // expected error: const* -> non-const*; Extra
gcc-error, see L:32
return 0;
}
//== GCC =======================
/tmp/sfinae_test$ /usr/bin/c++ --version
c++ (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0
Copyright (C) 2017 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
/tmp/sfinae_test$ /usr/bin/c++ -c sfinae_gcc_error.cpp
sfinae_gcc_error.cpp: In function ‘int main()’:
sfinae_gcc_error.cpp:58:20: error: no matching function for call to
‘SfinaeTest<int>::SfinaeTest(ConstPtr&)’
Ptr b_c( c); // expected error: const* -> non-const*; Extra
gcc-error: see L:25
^
sfinae_gcc_error.cpp:28:4: note: candidate: template<class TT, typename
std::enable_if<std::is_same<int, const TT>::value, int>::type <anonymous> >
SfinaeTest<T>::SfinaeTest(const SfinaeTest<TT>&)
SfinaeTest(const SfinaeTest<TT>& other)
^~~~~~~~~~
sfinae_gcc_error.cpp:28:4: note: template argument deduction/substitution
failed:
sfinae_gcc_error.cpp:27:98: error: no type named ‘type’ in ‘struct
std::enable_if<false, int>’
template<typename TT, typename std::enable_if< std::is_same<T, const
TT>::value, int>::type = 0>
^
sfinae_gcc_error.cpp:27:98: note: invalid template non-type parameter
sfinae_gcc_error.cpp:13:4: note: candidate: SfinaeTest<T>::SfinaeTest(const
SfinaeTest<T>&) [with T = int]
SfinaeTest(const SfinaeTest& other)
^~~~~~~~~~
sfinae_gcc_error.cpp:13:4: note: no known conversion for argument 1 from
‘ConstPtr {aka SfinaeTest<const int>}’ to ‘const SfinaeTest<int>&’
sfinae_gcc_error.cpp:9:4: note: candidate: SfinaeTest<T>::SfinaeTest() [with T
= int]
SfinaeTest()
^~~~~~~~~~
sfinae_gcc_error.cpp:9:4: note: candidate expects 0 arguments, 1 provided
sfinae_gcc_error.cpp:67:11: error: no match for ‘operator=’ (operand types are
‘Ptr {aka SfinaeTest<int>}’ and ‘ConstPtr {aka SfinaeTest<const int>}’)
d_c = c; // expected error: const* -> non-const*; Extra
gcc-error, see L:32
^
sfinae_gcc_error.cpp:17:16: note: candidate: SfinaeTest<T>&
SfinaeTest<T>::operator=(const SfinaeTest<T>&) [with T = int]
SfinaeTest& operator =(const SfinaeTest& ot)
^~~~~~~~
sfinae_gcc_error.cpp:17:16: note: no known conversion for argument 1 from
‘ConstPtr {aka SfinaeTest<const int>}’ to ‘const SfinaeTest<int>&’
sfinae_gcc_error.cpp:36:4: note: candidate: template<class TT> typename
std::enable_if<std::is_same<T, const TT>::value, SfinaeTest<T>&>::type
SfinaeTest<T>::operator=(const SfinaeTest<TT>&) [with TT = TT; T = int]
operator =(const SfinaeTest<TT>& ot)
^~~~~~~~
sfinae_gcc_error.cpp:36:4: note: template argument deduction/substitution
failed:
sfinae_gcc_error.cpp: In substitution of ‘template<class TT> typename
std::enable_if<std::is_same<int, const TT>::value, SfinaeTest<int>&>::type
SfinaeTest<int>::operator=<TT>(const SfinaeTest<TT>&) [with TT = const int]’:
sfinae_gcc_error.cpp:67:11: required from here
sfinae_gcc_error.cpp:36:4: error: no type named ‘type’ in ‘struct
std::enable_if<false, SfinaeTest<int>&>’
//== CLANG =======================
/tmp/sfinae_test$ /usr/bin/clang++ --version
clang version 6.0.0-1ubuntu2 (tags/RELEASE_600/final)
Target: x86_64-pc-linux-gnu
Thread model: posix
InstalledDir: /usr/bin
/tmp/sfinae_test$ /usr/bin/clang++ -c sfinae_gcc_error.cpp
sfinae_gcc_error.cpp:58:14: error: no matching constructor for initialization
of 'Ptr' (aka 'SfinaeTest<int>')
Ptr b_c( c); // expected error: const* -> non-const*; Extra
gcc-error: see L:25
^ ~
sfinae_gcc_error.cpp:13:4: note: candidate constructor not viable: no known
conversion from 'SfinaeTest<const int>' to 'const SfinaeTest<int>' for
1st argument
SfinaeTest(const SfinaeTest& other)
^
sfinae_gcc_error.cpp:28:4: note: candidate template ignored: requirement
'std::is_same<int, const const int>::value' was not satisfied
[with TT = const int]
SfinaeTest(const SfinaeTest<TT>& other)
^
sfinae_gcc_error.cpp:9:4: note: candidate constructor not viable: requires 0
arguments, but 1 was provided
SfinaeTest()
^
sfinae_gcc_error.cpp:67:9: error: no viable overloaded '='
d_c = c; // expected error: const* -> non-const*; Extra
gcc-error, see L:32
~~~ ^ ~
sfinae_gcc_error.cpp:17:16: note: candidate function not viable: no known
conversion from 'SfinaeTest<const int>' to 'const SfinaeTest<int>' for
1st argument
SfinaeTest& operator =(const SfinaeTest& ot)
^
sfinae_gcc_error.cpp:36:4: note: candidate template ignored: requirement
'std::is_same<int, const const int>::value' was not satisfied
[with TT = const int]
operator =(const SfinaeTest<TT>& ot)
^
2 errors generated.
/tmp/sfinae_test$
//== END =======================
>From gcc-bugs-return-616530-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 28 12:38:21 2018
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Subject: [Bug debug/87462] [7/8/9 Regression] undefined reference error occurs when -g, -fdebug-types-section and -O2 are used at the same time
Date: Fri, 28 Sep 2018 12:47:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |link-failure
CC| |rguenth at gcc dot gnu.org
Known to work| |6.4.0
Known to fail| |7.3.0, 8.2.0, 9.0
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Started with r240578
* dwarf2out.c (struct die_struct): Add removed flag.
(lookup_type_die): If the DIE is marked as removed, clear
TYPE_SYMTAB_DIE and return NULL.
(lookup_decl_die): If the DIE is marked as removed, remove it
from the hash and return NULL.
(mark_removed): New helper.
(prune_unused_types_prune): Call it for removed DIEs.
(gen_subprogram_die): Move the premark_used_types call to after
DIEs for the functions scopes are generated.
(process_scope_var): Do not re-create pruned types or type decls.
Make sure to also re-parent type decls.
(dwarf2out_finish): Move unused type pruning and debug_types
handling ...
(dwarf2out_early_finish): ... here.
>From gcc-bugs-return-616531-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 28 12:47:05 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87464] Gcc reports hard error instead of SFINAE out the related method
Date: Fri, 28 Sep 2018 12:49:00 -0000
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Alex from comment #0)
> Created attachment 44765 [details]
> test code
>
> The following code works with clang (7.x, 8.x) & VC (2015).
>
> Trouble: GCC reports a hard error instead of SFINAE-drop the methods:
No it doesn't. It reports a hard error as the reason for SFINAEing away those
functions.
> 1. "tst.cpp:27:149: error: no type named ‘type’ in ‘struct
> std::enable_if<false, int>’";
> 2. "tst.cpp:36:4: error: no type named ‘type’ in ‘struct
> std::enable_if<false, SfinaeTest<int>&>’"
>
> The clang and VC compilers do compile this places (besides the expected
> errors in main())
So they compile it, except that they don't.
GCC is telling you why the SFINAE constraint failed. If you add another
constructor that could be used instead you won't get errors.
>From gcc-bugs-return-616532-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 28 12:49:08 2018
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From: "fanael4 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87455] sse_packed_single_insn_optimal is suboptimal on Zen
Date: Fri, 28 Sep 2018 13:10:00 -0000
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--- Comment #3 from Fanael <fanael4 at gmail dot com> ---
> May be we should remove xorps generation part.
If it were up to me, I'd keep to for BDVER[1234] only, because xorps is still
one byte shorted than either xorpd or pxor and is as fast there, and introduce
a separate tune option for untyped vector *moves* specifically, which would
apply to BD, but also Zen, Pentium M, Core, Skylake (but not anything in
between, i.e. Nehalem to Broadwell (though my data on Ivy Bridge, Haswell and
Broadwell is not conclusive)) and other µarches where register-to-register
vector moves are renamed (as in Zen), untyped (as in Skylake) or always of the
same type (as in Core).
>From gcc-bugs-return-616533-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 28 13:10:16 2018
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Subject: [Bug target/87455] sse_packed_single_insn_optimal is suboptimal on Zen
Date: Fri, 28 Sep 2018 14:11:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87455
--- Comment #4 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
We already have TARGET_SSE_TYPELESS_STORES for stores, so perhaps we want
something like typeless reg-reg moves and loads flag?
Honza
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From: "neil.n.carlson at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/82996] ICE and segfault with derived type finalization
Date: Fri, 28 Sep 2018 14:28:00 -0000
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--- Comment #10 from Neil Carlson <neil.n.carlson at gmail dot com> ---
A reader on c.l.f suggested this workaround for the bug. I'm sharing it here
because I think it may help to isolate where the problem is. The suggestion
was to make the B array component allocatable and allocate it inside SUB. This
allows more control over when its finalizer is called. Here's a modified
version the runs without error (with -fsanitize=address,undefined) and valgrind
shows nothing amiss. (I'm using the 9.0 trunk)
module mod
type foo
integer, pointer :: f(:) => null()
contains
final :: foo_destroy
end type
type bar
type(foo), allocatable :: b(:)
end type
contains
elemental subroutine foo_destroy(this)
type(foo), intent(inout) :: this
if (associated(this%f)) deallocate(this%f)
end subroutine
end module
program main
use mod
type(bar) :: x
call sub(x) ! x%b not allocated
call sub(x) ! x%b is allocated
contains
subroutine sub(x)
type(bar), intent(out) :: x
allocate(x%b(2))
end subroutine
end program
The interesting thing is that the finalizer works just fine when the %B
component is allocatable and allocated (the second call to SUB), but not when
it is not allocatable.
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From: "michal.schulz at gmx dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86340] GCC 8.1 produces broken code for m68k with optimization levels above -O1
Date: Fri, 28 Sep 2018 14:42:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86340
Michal Schulz <michal.schulz at gmx dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |michal.schulz at gmx dot de
--- Comment #5 from Michal Schulz <michal.schulz at gmx dot de> ---
Created attachment 44766
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44766&action=edit
File with correctly used "register" keyword
The bug can be closed. The AROS macros were using "register" keyword in wrong
way. Putting register keyword at that place of the code was fully legit but did
not guarantee register reservation. The fact that in case of -O0 or -O1
optimizations the expected behavior was pure coincidence.
Section pointing to correct and incorrect use of "register" keyword:
https://gcc.gnu.org/onlinedocs/gcc/Local-Register-Variables.html#Local-Register-Variables
AROS macros will be adjusted accordingly to attached file. The variables
"extracted" from predefined registers will still be marked with the register
keyword, but additionally, an empty extended asm forcing the output operands
will be put into code, as shown in the file.
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Subject: [Bug testsuite/87433] [9 Regression] gcc.dg/zero_bits_compound-1.c and gcc.target/aarch64/ashltidisi.c tests fail after combine two to two instruction patch on aarch64
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--- Comment #5 from Steve Ellcey <sje at gcc dot gnu.org> ---
Author: sje
Date: Fri Sep 28 14:41:45 2018
New Revision: 264691
URL: https://gcc.gnu.org/viewcvs?rev=264691&root=gcc&view=rev
Log:
2018-09-28 Steve Ellcey <sellcey@cavium.com>
PR testsuite/87433
* gcc.dg/zero_bits_compound-1.c: Do not run on aarch64*-*-*.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/zero_bits_compound-1.c
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Subject: [Bug testsuite/87433] [9 Regression] gcc.dg/zero_bits_compound-1.c and gcc.target/aarch64/ashltidisi.c tests fail after combine two to two instruction patch on aarch64
Date: Fri, 28 Sep 2018 14:47:00 -0000
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--- Comment #6 from Steve Ellcey <sje at gcc dot gnu.org> ---
Author: sje
Date: Fri Sep 28 14:44:15 2018
New Revision: 264692
URL: https://gcc.gnu.org/viewcvs?rev=264692&root=gcc&view=rev
Log:
2018-09-28 Steve Ellcey <sellcey@cavium.com>
PR testsuite/87433
* gcc.target/aarch64/ashltidisi.c: Expect 3 asr instructions
instead of 4.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/aarch64/ashltidisi.c
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Subject: [Bug testsuite/87433] [9 Regression] gcc.dg/zero_bits_compound-1.c and gcc.target/aarch64/ashltidisi.c tests fail after combine two to two instruction patch on aarch64
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Steve Ellcey <sje at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #7 from Steve Ellcey <sje at gcc dot gnu.org> ---
Fixed the failures by updating the two tests.
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From: "webrown.cpp at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87463] New: ICE in in tsubst_copy, at cp/pt.c:15513
Date: Fri, 28 Sep 2018 15:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87463
Bug ID: 87463
Summary: ICE in in tsubst_copy, at cp/pt.c:15513
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: larsbj at gullik dot net
CC: webrown.cpp at gmail dot com
Target Milestone: ---
CC: webrown.cpp at gmail dot com
Created attachment 44764
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44764&action=edit
Source file showing the problem
When I compile the attached code I get this ICE:
g++ -v
Using built-in specs.
COLLECT_GCC=/opt/gcc/gcc-9/bin/g++
COLLECT_LTO_WRAPPER=/opt/gcc/gcc-9/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/opt/gcc/gcc-9
--enable-checking=release --enable-languages=c,c++
Thread model: posix
gcc version 9.0.0 20180925 (experimental) (GCC)
g++ -c foo.cpp
foo.cpp: In instantiation of ‘void l() [with <template-parameter-1-1> = int]’:
foo.cpp:17:12: required from here
foo.cpp:12:5: internal compiler error: in tsubst_copy, at cp/pt.c:15513
12 | ""_a;
| ^~~~
0x59e988 tsubst_copy
../../gcc/gcc/cp/pt.c:15513
0x6d083f tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/gcc/cp/pt.c:19039
0x6cfa0c tsubst_copy_and_build(tree_node*, tree_node*, int, tree_node*, bool,
bool)
../../gcc/gcc/cp/pt.c:18309
0x6c18dc tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:17455
0x6c1602 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16650
0x6c0bc2 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16939
0x6db708 tsubst_expr(tree_node*, tree_node*, int, tree_node*, bool)
../../gcc/gcc/cp/pt.c:16621
0x6db708 instantiate_decl(tree_node*, bool, bool)
../../gcc/gcc/cp/pt.c:24099
0x6ddbd3 instantiate_pending_templates(int)
../../gcc/gcc/cp/pt.c:24215
0x63fd80 c_parse_final_cleanups()
../../gcc/gcc/cp/decl2.c:4709
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87463] [9 Regression] ICE in in tsubst_copy, at cp/pt.c:15513
Date: Fri, 28 Sep 2018 15:46:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-28
CC| |mpolacek at gcc dot gnu.org
Target Milestone|--- |9.0
Summary|ICE in in tsubst_copy, at |[9 Regression] ICE in in
|cp/pt.c:15513 |tsubst_copy, at
| |cp/pt.c:15513
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Started with r261802.
>From gcc-bugs-return-616541-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 28 15:39:03 2018
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From: "paul.richard.thomas at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/87359] [9 regression] pointer being freed was not allocated
Date: Fri, 28 Sep 2018 16:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87359
--- Comment #44 from paul.richard.thomas at gmail dot com <paul.richard.thomas at gmail dot com> ---
Hi Jeurgen,
Thanks for the confirmation. I will take care of a composite fix over
the weeknd. (I get home tomorrow lunchtime.).
Cheers
Paul
On Fri, 28 Sep 2018 at 11:13, juergen.reuter at desy dot de
<gcc-bugzilla@gcc.gnu.org> wrote:
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87359
>
> --- Comment #43 from Jürgen Reuter <juergen.reuter at desy dot de> ---
> I just checked that Paul's fix actually solves all problems that our code had
> with the current trunk of gcc/gfortran as of r264501.
>
> --
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Subject: [Bug c/87390] [x86 32bit only] GCC does not honor FLT_EVAL_METHOD on implicit conversion of integer to floating point
Date: Fri, 28 Sep 2018 16:49:00 -0000
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--- Comment #28 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
Author: jsm28
Date: Fri Sep 28 15:45:51 2018
New Revision: 264696
URL: https://gcc.gnu.org/viewcvs?rev=264696&root=gcc&view=rev
Log:
Fix gcc.dg/torture/fp-int-convert.h for excess precision after PR c/87390.
As reported in
<https://gcc.gnu.org/ml/gcc-patches/2018-09/msg01684.html>, some
fp-int-convert tests fail after my fix for PR c/87390, in Arm /
AArch64 configurations where _Float16 uses excess precision by
default. The issue is comparisons of the results of a conversion by
assignment (compile-time or run-time) from integer to floating-point
with the original integer value; previously this would compare against
an implicit compile-time conversion to the target type, but now, for
C11 and later, it compares against an implicit compile-time conversion
to a possibly wider evaluation format. This is fixed by adding casts
to the test so that the comparison is with a value converted
explicitly to the target type at compile time, without any use of a
wider evaluation format.
PR c/87390
* gcc.dg/torture/fp-int-convert.h (TEST_I_F_VAL): Convert integer
values explicitly to target type for comparison.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.dg/torture/fp-int-convert.h
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Subject: [Bug fortran/87449] -Wunused-variable and associate
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--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
*** Bug 87450 has been marked as a duplicate of this bug. ***
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Subject: [Bug target/86340] GCC 8.1 produces broken code for m68k with optimization levels above -O1
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Andreas Schwab <schwab@linux-m68k.org> changed:
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----------------------------------------------------------------------------
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--- Comment #6 from Andreas Schwab <schwab@linux-m68k.org> ---
Not a bug.
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Subject: [Bug tree-optimization/86659] [9 regression] gnat.dg/sso/q[23].adb FAIL
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
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--- Comment #4 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Recategorizing.
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Subject: [Bug fortran/87450] -Wunused-variable: false positive for associate
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Dup.
*** This bug has been marked as a duplicate of bug 87449 ***
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Subject: [Bug fortran/87459] -Wunused-variable: False positive for associated variables
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Dup.
*** This bug has been marked as a duplicate of bug 87449 ***
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Subject: [Bug fortran/87449] -Wunused-variable and associate
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--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
*** Bug 87459 has been marked as a duplicate of this bug. ***
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Subject: [Bug fortran/87460] [F03] accepts-invalid bug with ASSOCIATE and array argument
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87460
Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-28
Ever confirmed|0 |1
--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Confirmed. From 4.8 up to 6.4 a warning is emitted instead of an error.
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From: "m.diehl at mpie dot de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/87449] -Wunused-variable and associate
Date: Fri, 28 Sep 2018 19:13:00 -0000
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--- Comment #3 from Martin Diehl <m.diehl at mpie dot de> ---
Dear Dominique,
sorry for the duplicated reports, I always got an server error and
assumed filing the report failed.
best regards,
Martin
On Fri, 2018-09-28 at 17:06 +0000, dominiq at lps dot ens.fr wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87449
>
> --- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr>
> ---
> *** Bug 87459 has been marked as a duplicate of this bug. ***
>
>From gcc-bugs-return-616551-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Sep 28 17:21:37 2018
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Subject: [Bug fortran/77900] Compile time errors/warning for IO statements appear wrong
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Jerry DeLisle <jvdelisle at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |WONTFIX
--- Comment #4 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
Not worth any effort at this point.
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From: "janus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/87460] [F03] accepts-invalid bug with ASSOCIATE and array argument
Date: Fri, 28 Sep 2018 20:33:00 -0000
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janus at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |accepts-invalid
--- Comment #2 from janus at gcc dot gnu.org ---
The problem seems to be that the associate symbol obtains a deferred array
spec, so that the number of elements cannot be determined.
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From: "david.bolvansky at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87465] New: Loop removal regression
Date: Sat, 29 Sep 2018 02:23:00 -0000
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Bug ID: 87465
Summary: Loop removal regression
Product: gcc
Version: 8.0
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void Test()
{
int c = 0;
int in[4] = {4,3,4,4};
for (unsigned i = 0; i < 4; i++) {
for (unsigned j = 0; j < i; j++) {
if (in[i] == in[j])
break;
else
++c;
}
}
printf("test %d", c);
}
GCC 7.3:
Test():
mov esi, 1
mov edi, OFFSET FLAT:.LC0
xor eax, eax
jmp printf
GCC 8+ is unable to simplify it as 7.3 (no loops are removed).
Godbolt:
https://godbolt.org/z/tDAuug
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Subject: [Bug target/16798] PowerPC - Opportunity to use recording form instruction.
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |segher at gcc dot gnu.org
--- Comment #7 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Combine starts with
insn_cost 4 for 11: {r122:DI=r126:DI>>0x34;clobber ca:DI;}
REG_DEAD r126:DI
REG_UNUSED ca:DI
insn_cost 8 for 12: r127:DI=[unspec[`*.LC1',%2:DI] 46]
REG_EQUAL `j'
insn_cost 4 for 13: [r127:DI]=r122:DI
REG_DEAD r127:DI
insn_cost 4 for 16: r128:CC=cmp(r122:DI,0)
REG_DEAD r122:DI
and we want 11 and 16 combined (later passes put 16 earlier btw).
But combine does not try to combine anything into 16: the first use of r122
as set in insn 11 is insn 13, not insn 16, and 11+13 does not combine.
But 11+13+16 is not tried. Maybe we should?
>From gcc-bugs-return-616555-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Sep 29 02:23:27 2018
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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/87466] New: IRA and LRA spill all pseudos that are live across setjmp calls
Date: Sat, 29 Sep 2018 02:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87466
Bug ID: 87466
Summary: IRA and LRA spill all pseudos that are live across
setjmp calls
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
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Target Milestone: ---
Currently, both IRA and LRA spill all pseudo regs that are live across a setjmp
call. If the target has a sane setjmp, then the compiler should not have to
treat the setjmp call any different to any other normal function call, namely,
just mark all pseudos that are live across the setjmp as conflicting with the
volatile registers.
This issue was discussed in the following gcc mailing list thread:
https://gcc.gnu.org/ml/gcc/2018-03/msg00014.html
Some people mentioned that some systems do not have sane setjmp implementations
and so need the spill all pseudos to get correct functionality. It was decided
that a target hook should be created that can allow targets to tell IRA and LRA
whether they have a sane setjmp implementation or not. This bugzilla entry is
being used to track that work.
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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/87466] IRA and LRA spill all pseudos that are live across setjmp calls
Date: Sat, 29 Sep 2018 07:50:00 -0000
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Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |bergner at gcc dot gnu.org
Target Milestone|--- |9.0
--- Comment #1 from Peter Bergner <bergner at gcc dot gnu.org> ---
I'm testing a patch.
>From gcc-bugs-return-616557-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Sep 29 02:27:10 2018
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From: "manodeep at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87467] New: Incorrect function parameter for _mm512_abs_pd in `include/avx512fintrin.h`
Date: Sat, 29 Sep 2018 08:13:00 -0000
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Bug ID: 87467
Summary: Incorrect function parameter for _mm512_abs_pd in
`include/avx512fintrin.h`
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: manodeep at gmail dot com
Target Milestone: ---
While trying to compile an AVX512F kernel containing vector intrinsics, I
encountered a warning from gcc 7.3.0:
----
/apps/skylake/software/core/gcccore/7.3.0/lib/gcc/x86_64-pc-linux-gnu/7.3.0/include/avx512fintrin.h:7301:1:
note: expected '__m512 {aka __vector(16) float}' but argument is of type
'__m512d {aka __vector(8) double}'
_mm512_abs_pd (__m512 __A)
----
`_mm512_abs_pd` refers to the double precision vector registers
(https://software.intel.com/sites/landingpage/IntrinsicsGuide/#text=_mm512_abs_pd&expand=5236,5298,54).
It looks like the bug is present in the new gcc-8 branch as well:
https://github.com/gcc-mirror/gcc/blob/gcc-8-branch/gcc/config/i386/avx512fintrin.h#L7730
Simply replacing `_mm512_abs_pd (__m512 __A)` with `_mm512_abs_pd (__m512d
__A)` should fix the problem.
Please let me know if you need any further info.
Cheers,
Dr. Manodeep Sinha,
Centre for Astrophysics & Supercomputing,
Swinburne University of Technology,
Hawthorn, VIC 3122.
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From: "paul.hua.gm at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87156] [9 Regression] ICE building libstdc++ for mips64
Date: Sat, 29 Sep 2018 08:21:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87156
--- Comment #4 from Paul Hua <paul.hua.gm at gmail dot com> ---
(In reply to Jan Hubicka from comment #3)
> Does the attached patch fix the bootstrap?
> Index: cgraphclones.c
> ===================================================================
> --- cgraphclones.c (revision 264180)
> +++ cgraphclones.c (working copy)
> @@ -967,6 +967,8 @@ cgraph_node::create_version_clone_with_b
> SET_DECL_ASSEMBLER_NAME (new_decl, DECL_NAME (new_decl));
> SET_DECL_RTL (new_decl, NULL);
>
> + DECL_VIRTUAL_P (new_decl) = 0;
> +
> /* When the old decl was a con-/destructor make sure the clone isn't. */
> DECL_STATIC_CONSTRUCTOR (new_decl) = 0;
> DECL_STATIC_DESTRUCTOR (new_decl) = 0;
Yes, fixed. Thanks.
>From gcc-bugs-return-616559-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Sep 29 08:13:53 2018
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Subject: [Bug tree-optimization/87465] [8/9 Regression] Loop removal regression
Date: Sat, 29 Sep 2018 08:36:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
Target Milestone|--- |9.0
Summary|Loop removal regression |[8/9 Regression] Loop
| |removal regression
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This changed with r255267, we don't peel/completely unroll the loop nest
anymore.
I'd say in this case it would be best done by a constexpr-like evaluation pass,
where we'd just at compile time try to evaluate a few (hundreds) iterations of
the loop at compile time and see if we can simply capture the whole outcome of
the loop (final values, maybe some simple array stores).
Until then, use C++14 constexpr evaluation if you want stuff to be evaluated at
compile time.
>From gcc-bugs-return-616560-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Sep 29 08:22:05 2018
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Subject: [Bug tree-optimization/87465] [8/9 Regression] Loop removal regression
Date: Sat, 29 Sep 2018 09:31:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-29
Target Milestone|9.0 |8.3
Ever confirmed|0 |1
>From gcc-bugs-return-616561-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Sep 29 08:36:08 2018
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Subject: [Bug target/87467] Incorrect function parameter for _mm512_abs_pd in `include/avx512fintrin.h`
Date: Sat, 29 Sep 2018 09:33:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-09-29
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 44768
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44768&action=edit
gcc9-pr87467.patch
Untested fix.
>From gcc-bugs-return-616562-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Sep 29 09:31:51 2018
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Subject: [Bug c/87468] New: ice "wrong amount of branch edges after conditional jump in bb"
Date: Sat, 29 Sep 2018 13:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87468
Bug ID: 87468
Summary: ice "wrong amount of branch edges after conditional
jump in bb"
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
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This C source code, when compiled by recent gcc trunk and flag -O2, does this:
bug465.c: In function ‘b’:
bug465.c:15:1: error: wrong amount of branch edges after conditional jump in bb
10
15 | }
| ^
bug465.c:15:1: error: wrong number of branch edges after unconditional jump in
bb 9
during RTL pass: outof_cfglayout
bug465.c:15:1: internal compiler error: verify_flow_info failed
0x8c9c27 verify_flow_info()
../../trunk/gcc/cfghooks.c:265
0x8e4711 checking_verify_flow_info
../../trunk/gcc/cfghooks.h:198
0x8e4711 cfg_layout_finalize()
../../trunk/gcc/cfgrtl.c:4350
0x8e4884 execute
../../trunk/gcc/cfgrtl.c:3606
The bug seems to occur somewhere between revisions 264595 and 264662.
>From gcc-bugs-return-616563-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Sep 29 09:33:01 2018
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Subject: [Bug c/87468] ice "wrong amount of branch edges after conditional jump in bb"
Date: Sat, 29 Sep 2018 13:57:00 -0000
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--- Comment #1 from David Binderman <dcb314 at hotmail dot com> ---
C source code is
a;
b() {
int c = 1;
for (; c <= 3;) {
int d = e() && !0;
switch (c)
case 1:
if (d)
case 2:
case 3:
f();
if (a)
c++;
}
}
>From gcc-bugs-return-616564-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Sep 29 13:12:36 2018
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Subject: [Bug c++/87469] New: ice in record_estimate, at tree-ssa-loop-niter.c:3271
Date: Sat, 29 Sep 2018 14:23:00 -0000
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Bug ID: 87469
Summary: ice in record_estimate, at tree-ssa-loop-niter.c:3271
Product: gcc
Version: 8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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Target Milestone: ---
For this C++ source code:
long a;
struct c {
void d(unsigned f) {
long e = f;
while (e & e - 1)
e &= e - 1;
a = e;
}
};
void g() {
c b;
b.d(4 + 2);
}
compiled by recent gcc trunk and compiler flag -O2, does this:
$ ~/gcc/results/bin/gcc -c -w -O2 bug466.cc
during GIMPLE pass: cunrolli
bug466.cc: In function ‘void g()’:
bug466.cc:10:6: internal compiler error: in record_estimate, at
tree-ssa-loop-niter.c:3271
10 | void g() {
| ^
0x10bc8da record_estimate
../../trunk/gcc/tree-ssa-loop-niter.c:3271
0x10c391b estimate_numbers_of_iterations(loop*)
../../trunk/gcc/tree-ssa-loop-niter.c:4122
0x10c4c0c estimate_numbers_of_iterations(function*)
../../trunk/gcc/tree-ssa-loop-niter.c:4342
0x109e88e tree_unroll_loops_completely
../../trunk/gcc/tree-ssa-loop-ivcanon.c:1424
The problem seems to first occur somewhere between revisions
261000 and 262000.
>From gcc-bugs-return-616565-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Sep 29 13:57:33 2018
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From: "murat.ursavas at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87373] Packed structs are not handled properly on ARM architecture even with misaligned access is enabled
Date: Sat, 29 Sep 2018 14:43:00 -0000
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Murat UrsavaÅŸ <murat.ursavas at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |UNCONFIRMED
Resolution|INVALID |---
--- Comment #28 from Murat UrsavaÅŸ <murat.ursavas at gmail dot com> ---
Hi,
I've created the time and added 7.3.1 to my toolchain list. (It is really
annoyingly hard to add a new toolchain in my configuration due to a bug in the
IDE).
Anyway right now I can compare 4.9.3 and 7.3.1 side by side and my application
is not working with the 7 series. That is exactly how it started at the
beginning.
I've cleared some issues that could interfere with this issue but now I can
reproduce the issue on my target.
I'm not sure this is due to packed structs or not but I've found a difference
which should not happen. Please bear with me on this.
Here's the disassembly of a problematic part:
4.9.3
121 NVM_SPI->ROUTE = USART_ROUTE_TXPEN | USART_ROUTE_RXPEN |
USART_ROUTE_CLKPEN | NVM_SPI_LOCATION;
00029e38: ldr r3,[pc,#0x4c] ; 0x29e84
00029e3a: ldr r2,[r3,#0x54]
00029e3c: movs r2,#0x0
00029e3e: orr r2,r2,#0xb
00029e42: str r2,[r3,#0x54]
7.3.1
121 NVM_SPI->ROUTE = USART_ROUTE_TXPEN | USART_ROUTE_RXPEN |
USART_ROUTE_CLKPEN | NVM_SPI_LOCATION;
0000572e: ldr r3,[pc,#0x70] ; 0x579c
00005730: ldrb.w r2,[r3,#0x54]
00005734: movs r2,#0x0
00005736: orr r2,r2,#0xb
0000573a: strb.w r2,[r3,#0x54]
0000573e: ldrb.w r2,[r3,#0x55]
00005742: movs r2,#0x0
00005744: strb.w r2,[r3,#0x55]
00005748: ldrb.w r2,[r3,#0x56]
0000574c: movs r2,#0x0
0000574e: strb.w r2,[r3,#0x56]
00005752: ldrb.w r2,[r3,#0x57]
00005756: movs r2,#0x0
00005758: strb.w r2,[r3,#0x57]
4.9.3 sets the ROUTE register as 0xB correctly. But 7.3.1 sets it as 0x30B. The
correct value is 0xB (calculated from the bit values). This maps the USART to
the wrong pins and makes the peripheral physically useless and also cripples
other pins.
Like I said, this may not be a bug, could be my error or vendor libraries but
something doesn't look right. Please let me know if you need further info. I
may need some guidance to collect more data.
P.S: I'm trying to improve GCC, otherwise I'm just fine with 4.9.3.
>From gcc-bugs-return-616566-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Sep 29 14:23:11 2018
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Subject: [Bug inline-asm/63900] memory constrains needlessly doing memory clobber
Date: Sat, 29 Sep 2018 15:05:00 -0000
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Christopher Head <headch at gmail dot com> changed:
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----------------------------------------------------------------------------
CC| |headch at gmail dot com
--- Comment #7 from Christopher Head <headch at gmail dot com> ---
It seems to me that this is fixed in 8.2.0?
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Subject: [Bug middle-end/87370] Regression in return struct code
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--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 44769
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44769&action=edit
I am testing this patch
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Subject: [Bug target/87370] [7/8/9 Regression] Inefficient return code of struct values
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H.J. Lu <hjl.tools at gmail dot com> changed:
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----------------------------------------------------------------------------
CC| |ubizjak at gmail dot com
Component|middle-end |target
Target Milestone|--- |9.0
Summary|Regression in return struct |[7/8/9 Regression]
|code |Inefficient return code of
| |struct values
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Subject: [Bug target/87467] Incorrect function parameter for _mm512_abs_pd in `include/avx512fintrin.h`
Date: Sat, 29 Sep 2018 16:29:00 -0000
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Sat Sep 29 16:04:09 2018
New Revision: 264711
URL: https://gcc.gnu.org/viewcvs?rev=264711&root=gcc&view=rev
Log:
PR target/87467
* config/i386/avx512fintrin.h (_mm512_abs_pd, _mm512_mask_abs_pd): Use
__m512d type for __A argument rather than __m512.
* gcc.target/i386/avx512f-abspd-1.c (SIZE): Divide by two.
(CALC): Use double instead of float.
(TEST): Adjust to test _mm512_abs_pd and _mm512_mask_abs_pd rather than
_mm512_abs_ps and _mm512_mask_abs_ps.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/avx512fintrin.h
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/i386/avx512f-abspd-1.c
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Subject: [Bug target/87467] Incorrect function parameter for _mm512_abs_pd in `include/avx512fintrin.h`
Date: Sat, 29 Sep 2018 17:17:00 -0000
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Sat Sep 29 16:09:59 2018
New Revision: 264713
URL: https://gcc.gnu.org/viewcvs?rev=264713&root=gcc&view=rev
Log:
PR target/87467
* config/i386/avx512fintrin.h (_mm512_abs_pd, _mm512_mask_abs_pd): Use
__m512d type for __A argument rather than __m512.
* gcc.target/i386/avx512f-abspd-1.c (SIZE): Divide by two.
(CALC): Use double instead of float.
(TEST): Adjust to test _mm512_abs_pd and _mm512_mask_abs_pd rather than
_mm512_abs_ps and _mm512_mask_abs_ps.
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/config/i386/avx512fintrin.h
branches/gcc-8-branch/gcc/testsuite/ChangeLog
branches/gcc-8-branch/gcc/testsuite/gcc.target/i386/avx512f-abspd-1.c
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Subject: [Bug target/87467] Incorrect function parameter for _mm512_abs_pd in `include/avx512fintrin.h`
Date: Sat, 29 Sep 2018 18:16:00 -0000
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--- Comment #4 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Sat Sep 29 16:28:53 2018
New Revision: 264714
URL: https://gcc.gnu.org/viewcvs?rev=264714&root=gcc&view=rev
Log:
PR target/87467
* config/i386/avx512fintrin.h (_mm512_abs_pd, _mm512_mask_abs_pd): Use
__m512d type for __A argument rather than __m512.
* gcc.target/i386/avx512f-abspd-1.c (SIZE): Divide by two.
(CALC): Use double instead of float.
(TEST): Adjust to test _mm512_abs_pd and _mm512_mask_abs_pd rather than
_mm512_abs_ps and _mm512_mask_abs_ps.
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/config/i386/avx512fintrin.h
branches/gcc-7-branch/gcc/testsuite/ChangeLog
branches/gcc-7-branch/gcc/testsuite/gcc.target/i386/avx512f-abspd-1.c
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Subject: [Bug c++/65667] [5 Regression] FAIL: g++.dg/cpp0x/pr57101.C -std=gnu++11 (test for excess errors)
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--- Comment #4 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Sat Sep 29 17:17:09 2018
New Revision: 264715
URL: https://gcc.gnu.org/viewcvs?rev=264715&root=gcc&view=rev
Log:
2018-09-29 Paul Thomas <pault@gcc.gnu.org>
PR fortran/65667
* trans-expr.c (gfc_trans_assignment_1): If there is dependency
fix the rse stringlength.
2018-09-29 Paul Thomas <pault@gcc.gnu.org>
PR fortran/65667
* gfortran.dg/dependency_52.f90 : New test.
Added:
trunk/gcc/testsuite/gfortran.dg/dependency_52.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/trans-expr.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/87467] Incorrect function parameter for _mm512_abs_pd in `include/avx512fintrin.h`
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87467
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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Resolution|--- |FIXED
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Fixed everywhere.
>From gcc-bugs-return-616574-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sat Sep 29 18:31:24 2018
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Subject: [Bug c++/87373] Packed structs are not handled properly on ARM architecture even with misaligned access is enabled
Date: Sat, 29 Sep 2018 18:56:00 -0000
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--- Comment #29 from Murat UrsavaÅŸ <murat.ursavas at gmail dot com> ---
And just out of curiosity, why the compiler loads zero to the register and then
OR's with the value?
00029e3c: movs r2,#0x0
00029e3e: orr r2,r2,#0xb
Why doesn't it load directly the necessary value? Like,
00029e3c: movs r2,#0xb
I know ARM arch needs load/store mechanism for the RAM but why this additional
task for a register?
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Subject: [Bug inline-asm/63900] memory constrains needlessly doing memory clobber
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--- Comment #8 from Segher Boessenkool <segher at gcc dot gnu.org> ---
It is not fixed in trunk, even. A better testcase removes the __volatile__:
if this is properly optimised the whole asm disappears then, but in the case
of MYSIZE 3 it does not with the current GCC.
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Subject: [Bug c++/87373] Packed structs are not handled properly on ARM architecture even with misaligned access is enabled
Date: Sat, 29 Sep 2018 20:16:00 -0000
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--- Comment #30 from Murat UrsavaÅŸ <murat.ursavas at gmail dot com> ---
OK, looks like it is possible like this:
ldr r2, =0x0000000b
Source:
https://stackoverflow.com/questions/38689886/loading-32-bit-values-to-a-register-in-arm-assembly
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Subject: [Bug c++/87373] Packed structs are not handled properly on ARM architecture even with misaligned access is enabled
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--- Comment #31 from Murat UrsavaÅŸ <murat.ursavas at gmail dot com> ---
(In reply to Murat UrsavaÅŸ from comment #28)
>
> Here's the disassembly of a problematic part:
>
> 4.9.3
>
> 121 NVM_SPI->ROUTE = USART_ROUTE_TXPEN | USART_ROUTE_RXPEN |
> USART_ROUTE_CLKPEN | NVM_SPI_LOCATION;
> 00029e38: ldr r3,[pc,#0x4c] ; 0x29e84
> 00029e3a: ldr r2,[r3,#0x54]
> 00029e3c: movs r2,#0x0
> 00029e3e: orr r2,r2,#0xb
> 00029e42: str r2,[r3,#0x54]
>
> 7.3.1
>
> 121 NVM_SPI->ROUTE = USART_ROUTE_TXPEN | USART_ROUTE_RXPEN |
> USART_ROUTE_CLKPEN | NVM_SPI_LOCATION;
> 0000572e: ldr r3,[pc,#0x70] ; 0x579c
> 00005730: ldrb.w r2,[r3,#0x54]
> 00005734: movs r2,#0x0
> 00005736: orr r2,r2,#0xb
> 0000573a: strb.w r2,[r3,#0x54]
> 0000573e: ldrb.w r2,[r3,#0x55]
> 00005742: movs r2,#0x0
> 00005744: strb.w r2,[r3,#0x55]
> 00005748: ldrb.w r2,[r3,#0x56]
> 0000574c: movs r2,#0x0
> 0000574e: strb.w r2,[r3,#0x56]
> 00005752: ldrb.w r2,[r3,#0x57]
> 00005756: movs r2,#0x0
> 00005758: strb.w r2,[r3,#0x57]
My limited assembler knowledge says new one is byte by byte access and should
set the register correctly, but somehow it's not.
Could actual object code be different than what I see in the disassembly? I'll
try to verify it via inspecting the code space.
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Subject: [Bug c++/87373] Packed structs are not handled properly on ARM architecture even with misaligned access is enabled
Date: Sat, 29 Sep 2018 22:01:00 -0000
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Murat UrsavaÅŸ <murat.ursavas at gmail dot com> changed:
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----------------------------------------------------------------------------
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Resolution|--- |INVALID
--- Comment #32 from Murat UrsavaÅŸ <murat.ursavas at gmail dot com> ---
OK, dug down into Thumb-2 reference manual and verified. The code space shows
correct instructions.
For this line;
strb.w r2,[r3,#0x54]
It shows;
0xF883 0x2054
If I've read correctly, this is exactly what the disassembly says.
I guess from GCC perspective, this is a perfectly valid situation and this
ticket should be closed.
If you have any additional ideas what could cause this, I'm all ears
(Peripheral, Core, GDB). Otherwise, thanks for your time. It was enlightening
for me to chase this issue.
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Subject: [Bug c++/87373] Packed structs are not handled properly on ARM architecture even with misaligned access is enabled
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--- Comment #33 from Murat UrsavaÅŸ <murat.ursavas at gmail dot com> ---
One thing though. Would you accept this a regression and get back to 4.9 style?
Yes, GCC is doing everything by the book but the result is not perfect (due to
other undocumented issues not related to GNU team).
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Subject: [Bug target/87370] [7/8/9 Regression] Inefficient return code of struct values
Date: Sat, 29 Sep 2018 22:17:00 -0000
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--- Comment #5 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Sat Sep 29 21:59:59 2018
New Revision: 264716
URL: https://gcc.gnu.org/viewcvs?rev=264716&root=gcc&view=rev
Log:
i386: Use TImode for BLKmode values in 2 integer registers
When passing and returning BLKmode values in 2 integer registers, use
1 TImode register instead of 2 DImode registers. Otherwise, V1TImode
may be used to move and store such BLKmode values, which prevent RTL
optimizations.
gcc/
PR target/87370
* config/i386/i386.c (construct_container): Use TImode for
BLKmode values in 2 integer registers.
gcc/testsuite/
PR target/87370
* gcc.target/i386/pr87370.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/pr87370.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/87370] [7/8/9 Regression] Inefficient return code of struct values
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H.J. Lu <hjl.tools at gmail dot com> changed:
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----------------------------------------------------------------------------
Target|x86_64-*-* i?86-*-* |x86_64-*-*
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Last reconfirmed| |2018-09-29
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--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed on trunk so far.
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/87468] [9 Regression] ice "wrong amount of branch edges after conditional jump in bb"
Date: Sun, 30 Sep 2018 00:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87468
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Component|c |rtl-optimization
Version|8.0 |9.0
Target Milestone|--- |9.0
Summary|ice "wrong amount of branch |[9 Regression] ice "wrong
|edges after conditional |amount of branch edges
|jump in bb" |after conditional jump in
| |bb"
>From gcc-bugs-return-616584-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Sep 30 00:44:21 2018
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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87403] [Meta-bug] Issues that suggest a new warning
Date: Sun, 30 Sep 2018 00:53:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87403
Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-30
CC| |egallager at gcc dot gnu.org
Depends on| |72789, 80151, 71482, 55077,
| |65213, 82100, 61864, 33715,
| |67479, 81159, 84203, 62181,
| |70065
Ever confirmed|0 |1
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #1)
> I think we should use a keyword for this one instead of a meta-bug as this
> bug will always be open.
Yeah, I mean, we already have the "diagnostic" keyword anyways, and this will
just be a subset of that... keywords aren't clickable, though, so I'm gonna
confirm this after all.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=33715
[Bug 33715] Suggest -Wmemleak warning for C++
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55077
[Bug 55077] implement and enable by default -Wliteral-conversion
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61864
[Bug 61864] -Wcovered-switch-default to identify "dead" default branch
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62181
[Bug 62181] [C/C++] Expected new warning: "adding 'char' to a string does not
append to the string" [-Wstring-plus-int]
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65213
[Bug 65213] Extend -Wmissing-declarations to variables [i.e. add
-Wmissing-variable-declarations]
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67479
[Bug 67479] Support for -Wformat-pedantic
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70065
[Bug 70065] Split -Wparentheses warnings about operators priority into a
separate warning flag, -Wprecedence
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71482
[Bug 71482] Add -Wglobal-constructors warning option
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72789
[Bug 72789] add -Wunused-private-field
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80151
[Bug 80151] Add a warning to catch implicit string to bool conversion
(-Wstring-conversion)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81159
[Bug 81159] New warning idea: -Wself-move
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82100
[Bug 82100] gcc does not warn about code that is unreachable due to conflicting
conditions [subset of reviving -Wunreachable-code]
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84203
[Bug 84203] add -Wsuggest-attribute=returns_nonnull
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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug go/87470] New: [9 Regression] libgo/go/runtime/malloc.go failed to build with -mx32
Date: Sun, 30 Sep 2018 00:53:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87470
Bug ID: 87470
Summary: [9 Regression] libgo/go/runtime/malloc.go failed to
build with -mx32
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: go
Assignee: ian at airs dot com
Reporter: hjl.tools at gmail dot com
CC: cmang at google dot com
Target Milestone: ---
Target: x86-64
On x86-64, r264546 caused:
libtool: compile:
/export/build/gnu/tools-build/gcc-x32-debug/build-x86_64-linux/./gcc/gccgo
-B/export/build/gnu/tools-build/gcc-x32-debug/build-x86_64-linux/./gcc/
-B/usr/gcc-9.0.0-x32/x86_64-pc-linux-gnu/bin/
-B/usr/gcc-9.0.0-x32/x86_64-pc-linux-gnu/lib/ -isystem
/usr/gcc-9.0.0-x32/x86_64-pc-linux-gnu/include -isystem
/usr/gcc-9.0.0-x32/x86_64-pc-linux-gnu/sys-include -minline-all-stringops -O2
-g -mx32 -I . -c -fgo-pkgpath=runtime -fgo-c-header=runtime.inc.raw
-fgo-compiling-runtime
/export/gnu/import/git/sources/gcc/libgo/go/runtime/alg.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/atomic_pointer.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/cgo_gccgo.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/cgocall.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/cgocheck.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/chan.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/compiler.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/cpuprof.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/cputicks.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/debug.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/env_posix.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/error.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/extern.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/fastlog2.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/fastlog2table.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/ffi.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/float.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/hash64.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/heapdump.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/iface.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/lfstack.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/lfstack_64bit.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/lock_futex.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/malloc.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/map.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/map_fast32.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/map_fast64.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/map_faststr.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mbarrier.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mbitmap.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mcache.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mcentral.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mem_gccgo.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mfinal.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mfixalloc.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mgc.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mgc_gccgo.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mgclarge.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mgcmark.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mgcsweep.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mgcsweepbuf.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mgcwork.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mheap.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mprof.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/msan0.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/msize.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mstats.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/mwbbuf.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/netpoll.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/netpoll_epoll.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/os_gccgo.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/os_linux.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/os_linux_noauxv.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/panic.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/print.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/proc.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/profbuf.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/proflabel.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/race0.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/rdebug.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/relax_stub.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/runtime.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/runtime1.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/runtime2.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/rwmutex.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/select.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/sema.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/signal_gccgo.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/signal_sighandler.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/signal_unix.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/sigqueue.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/sizeclasses.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/slice.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/string.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/stubs.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/stubs2.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/stubs3.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/stubs_linux.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/symtab.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/time.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/timestub.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/timestub2.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/trace.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/traceback_gccgo.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/type.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/typekind.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/unaligned1.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/utf8.go
/export/gnu/import/git/sources/gcc/libgo/go/runtime/write_err.go
runtime_sysinfo.go sigtab.go -fPIC -o .libs/runtime.o
/export/gnu/import/git/sources/gcc/libgo/go/runtime/malloc.go:309:44: error:
integer constant overflow
309 | arenaBaseOffset uintptr = sys.GoarchAmd64 * (1 << 47)
| ^
make[9]: *** [Makefile:2964: runtime.lo] Error 1
>From gcc-bugs-return-616585-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Sep 30 00:53:45 2018
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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87405] Implement -Wliteral-conversion
Date: Sun, 30 Sep 2018 00:53:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |egallager at gcc dot gnu.org
Resolution|--- |DUPLICATE
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
Dup of bug 55077
*** This bug has been marked as a duplicate of bug 55077 ***
>From gcc-bugs-return-616587-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Sep 30 00:53:47 2018
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Subject: [Bug c++/87403] [Meta-bug] Issues that suggest a new warning
Date: Sun, 30 Sep 2018 01:05:00 -0000
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Bug 87403 depends on bug 87405, which changed state.
Bug 87405 Summary: Implement -Wliteral-conversion
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87405
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/55077] implement and enable by default -Wliteral-conversion
Date: Sun, 30 Sep 2018 01:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=55077
Eric Gallager <egallager at gcc dot gnu.org> changed:
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CC| |marxin at gcc dot gnu.org
--- Comment #8 from Eric Gallager <egallager at gcc dot gnu.org> ---
*** Bug 87405 has been marked as a duplicate of this bug. ***
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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87404] Implement -Wenum-compare and -Wenum-compare-switch
Date: Sun, 30 Sep 2018 01:07:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=52763,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=78736,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=69672
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
There are lots of open bugs that this could be a dup of, see for example:
- bug 52763
- bug 78736
- bug 69672
>From gcc-bugs-return-616589-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Sep 30 01:07:18 2018
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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87409] Implement -Wunused-private-field
Date: Sun, 30 Sep 2018 01:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87409
Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #6 from Eric Gallager <egallager at gcc dot gnu.org> ---
Dup of bug 72789
*** This bug has been marked as a duplicate of bug 72789 ***
>From gcc-bugs-return-616590-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Sep 30 01:07:22 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/72789] add -Wunused-private-field
Date: Sun, 30 Sep 2018 01:14:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
*** Bug 87409 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-616591-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Sep 30 01:07:22 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87403] [Meta-bug] Issues that suggest a new warning
Date: Sun, 30 Sep 2018 01:32:00 -0000
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Bug 87403 depends on bug 87409, which changed state.
Bug 87409 Summary: Implement -Wunused-private-field
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87409
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>From gcc-bugs-return-616592-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Sep 30 01:14:19 2018
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Subject: [Bug c++/87407] Enhance -Wunused-function to handle also inline functions
Date: Sun, 30 Sep 2018 01:42:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #13 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #5)
> Test the warning out on clang from a header file and you will see you get
> the warning in the header too. As I said I actually ran into this while
> working on the vpp project and cursed clang for having this warning turned
> on.
I think something similar happened with the gdb project; I'll try to find it
later...
>From gcc-bugs-return-616593-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Sep 30 01:32:44 2018
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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87435] "Duplicate const" warning NOT emitted from typedef in -stdÉ0
Date: Sun, 30 Sep 2018 01:46:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
CC| |egallager at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=80868,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=53075,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=66505
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
Might also be related to bug 53075 and/or bug 66505
>From gcc-bugs-return-616594-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Sep 30 01:42:50 2018
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Subject: [Bug c/64743] minor issue with the location of -Wlong-long
Date: Sun, 30 Sep 2018 01:49:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #3)
> (In reply to Eric Gallager from comment #2)
> > Eh, I think gcc's current behavior makes sense, the 2nd long is the one that
> > makes it a long long rather than just a long, since people type left to
> > right. When typing in order, when you've typed just the 1st long, it won't
> > have triggered -Wlong-long yet.
>
> If anyone still wants to change this, I'm putting this bug in WAITING for 3
> months; if there's no reply after that I'll close it as WONTFIX.
No reply; closing as WONTFIX
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Subject: [Bug rtl-optimization/11261] Weak code generated for JPEG compression
Date: Sun, 30 Sep 2018 01:51:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |joern.rennecke at superh dot com
Assignee|joern.rennecke at superh dot com |unassigned at gcc dot gnu.org
--- Comment #8 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #7)
> (In reply to Jorn Wolfgang Rennecke from comment #5)
> > (In reply to comment #4)
> > > This bug hasn't been modified in more than 18 months. What is the
> > > current status of this bug? And is this not really a target specific
> > > issue for SH with its silly r0, or can other targets also have this
> > > problem??
> >
> > The sh-elf libraries won't build because of PR 22258.
> > Because we have sched1 enabled, the scheduling problem is currently
> > non-existant; the values that are needed in r0 can be calculated
> > in a different general purpose register, and moved into r0 in time for the
> > indexed addressing.
> > However, because of sched1 we now have too high register pressure for other
> > benchmarks. Vlad proposed at the summit to postpone scheduling after reload
> > to fix the register pressure issue. Unless his porposed register renaming
> > schedme can handle this case and snarf the required registers too, we'll
> > go back to square one.
>
> Are you still working on this?
Guess not, moving from assignee to cc
>From gcc-bugs-return-616596-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Sep 30 01:50:09 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/54640] arm_adjust_block_mem: signed/unsigned comparison [-Werror=sign-compare]
Date: Sun, 30 Sep 2018 01:54:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |build, diagnostic
CC| |rearnsha at gcc dot gnu.org
Assignee|rearnsha at gcc dot gnu.org |unassigned at gcc dot gnu.org
Summary|arm_adjust_block_mem: |arm_adjust_block_mem:
|signed/unsigned comparison |signed/unsigned comparison
| |[-Werror=sign-compare]
--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #3)
> (In reply to Jorn Wolfgang Rennecke from comment #2)
> > I have reverted my patch because of an objection by Richard Earnshaw
>
> Is he still working on this?
I guess not; moving from assignee to cc
>From gcc-bugs-return-616597-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Sep 30 01:51:38 2018
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Subject: [Bug tree-optimization/31178] VRP can infer a range for b in a >> b and a << b
Date: Sun, 30 Sep 2018 02:04:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Assignee|rguenth at gcc dot gnu.org |unassigned at gcc dot gnu.org
--- Comment #7 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #6)
> (In reply to Richard Biener from comment #3)
> > No, it's now possible to implement this optimization (but yes, nobody has
> > done so sofar). It's on my TODO (with tons of other stuff, of course).
> >
>
> Is that still the case?
>
Guess not.
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Subject: [Bug tree-optimization/36281] vector code is not parallelized
Date: Sun, 30 Sep 2018 02:07:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks| |53947
Assignee|spop at gcc dot gnu.org |unassigned at gcc dot gnu.org
--- Comment #5 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #4)
> (In reply to Sebastian Pop from comment #0)
> > The testcase of PR36181 should be parallelized after being vectorized.
> >
> > /* { dg-do compile } */
> > /* { dg-options "-O3 -ftree-parallelize-loops=2" } */
> >
> > int foo ()
> > {
> > int i, sum = 0, data[1024];
> >
> > for(i = 0; i<1024; i++)
> > sum += data[i];
> >
> > return sum;
> > }
> >
> > The fix for PR36181 was to disable the parallelization of a loop when
> > one of the phi nodes had a vector type. This testcase should also be
> > parallelized. See also the comments from the fix for PR36181:
> > http://gcc.gnu.org/ml/gcc-patches/2008-05/msg01217.html
>
> Are you still working on this?
Guess not.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53947
[Bug 53947] [meta-bug] vectorizer missed-optimizations
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Subject: [Bug tree-optimization/42970] Missed unused function return value elimination
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jamborm at gcc dot gnu.org
Assignee|jamborm at gcc dot gnu.org |unassigned at gcc dot gnu.org
--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #3)
> Should Martin Jambor remain the assignee for this?
No reply; moving from assignee to cc
>From gcc-bugs-return-616600-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Sep 30 02:07:13 2018
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Subject: [Bug c++/80496] missing diagnostic regarding noreturn mismatch in function pointer initialization
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org,
| |dodji at gcc dot gnu.org
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing diagnostics maintainers
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Subject: [Bug fortran/70149] [F08] Character pointer initialization causes ICE
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--- Comment #8 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Sun Sep 30 07:02:49 2018
New Revision: 264721
URL: https://gcc.gnu.org/viewcvs?rev=264721&root=gcc&view=rev
Log:
2018-09-30 Paul Thomas <pault@gcc.gnu.org>
PR fortran/70149
* trans-decl.c (gfc_get_symbol_decl): A deferred character
length pointer that is initialized needs the string length to
be initialized as well.
2018-09-30 Paul Thomas <pault@gcc.gnu.org>
PR fortran/70149
* gfortran.dg/deferred_character_24.f90 : New test.
Added:
trunk/gcc/testsuite/gfortran.dg/deferred_character_24.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/trans-decl.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug tree-optimization/57755] Improve fold_binary_op_with_conditional_arg
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--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #2)
> (In reply to Marc Glisse from comment #1)
> > This patch seems to help for the testcases in this PR and passes the
> > testsuite (with one XPASS). I'll add some testcases and post it to
> > gcc-patches later.
>
> ...how much later? (It's been 5 years...)
It was posted on the very same day:
https://gcc.gnu.org/ml/gcc-patches/2013-06/msg01624.html
To find the replies (not the same month), it seems easier to have a look at
https://patchwork.ozlabs.org/patch/255719/
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/70752] Incorrect LEN for ALLOCATABLE CHARACTER
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--- Comment #3 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Sun Sep 30 12:22:07 2018
New Revision: 264724
URL: https://gcc.gnu.org/viewcvs?rev=264724&root=gcc&view=rev
Log:
2018-09-30 Paul Thomas <pault@gcc.gnu.org>
PR fortran/70752
PR fortran/72709
* trans-array.c (gfc_conv_scalarized_array_ref): If this is a
deferred type and the info->descriptor is present, use the
info->descriptor
(gfc_conv_array_ref): Is the se expr is a descriptor type, pass
it as 'decl' rather than the symbol backend_decl.
(gfc_array_allocate): If the se string_length is a component
reference, fix it and use it for the expression string length
if the latter is not a variable type. If it is a variable do
an assignment. Make use of component ref string lengths to set
the descriptor 'span'.
(gfc_conv_expr_descriptor): For pointer assignment, do not set
the span field if gfc_get_array_span returns zero.
* trans.c (get_array_span): If the upper bound a character type
is zero, use the descriptor span if available.
2018-09-30 Paul Thomas <pault@gcc.gnu.org>
PR fortran/70752
PR fortran/72709
* gfortran.dg/deferred_character_25.f90 : New test.
* gfortran.dg/deferred_character_26.f90 : New test.
* gfortran.dg/deferred_character_27.f90 : New test to verify
that PR82617 remains fixed.
Added:
trunk/gcc/testsuite/gfortran.dg/deferred_character_25.f90
trunk/gcc/testsuite/gfortran.dg/deferred_character_26.f90
trunk/gcc/testsuite/gfortran.dg/deferred_character_27.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/trans-array.c
trunk/gcc/fortran/trans.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/72709] Incorrect assignment of allocatable character array used as component of derived type
Date: Sun, 30 Sep 2018 13:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72709
--- Comment #9 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Sun Sep 30 12:22:07 2018
New Revision: 264724
URL: https://gcc.gnu.org/viewcvs?rev=264724&root=gcc&view=rev
Log:
2018-09-30 Paul Thomas <pault@gcc.gnu.org>
PR fortran/70752
PR fortran/72709
* trans-array.c (gfc_conv_scalarized_array_ref): If this is a
deferred type and the info->descriptor is present, use the
info->descriptor
(gfc_conv_array_ref): Is the se expr is a descriptor type, pass
it as 'decl' rather than the symbol backend_decl.
(gfc_array_allocate): If the se string_length is a component
reference, fix it and use it for the expression string length
if the latter is not a variable type. If it is a variable do
an assignment. Make use of component ref string lengths to set
the descriptor 'span'.
(gfc_conv_expr_descriptor): For pointer assignment, do not set
the span field if gfc_get_array_span returns zero.
* trans.c (get_array_span): If the upper bound a character type
is zero, use the descriptor span if available.
2018-09-30 Paul Thomas <pault@gcc.gnu.org>
PR fortran/70752
PR fortran/72709
* gfortran.dg/deferred_character_25.f90 : New test.
* gfortran.dg/deferred_character_26.f90 : New test.
* gfortran.dg/deferred_character_27.f90 : New test to verify
that PR82617 remains fixed.
Added:
trunk/gcc/testsuite/gfortran.dg/deferred_character_25.f90
trunk/gcc/testsuite/gfortran.dg/deferred_character_26.f90
trunk/gcc/testsuite/gfortran.dg/deferred_character_27.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/trans-array.c
trunk/gcc/fortran/trans.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug debug/87472] New: Unknown macro opcode with -gsplit-dwarf -g3
Date: Sun, 30 Sep 2018 13:53:00 -0000
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Bug ID: 87472
Summary: Unknown macro opcode with -gsplit-dwarf -g3
Product: gcc
Version: 9.0
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Target Milestone: ---
[hjl@gnu-cfl-1 pr79342]$ cat foo.c
void
foo (void)
{
}
[hjl@gnu-cfl-1 pr79342]$
/export/build/gnu/tools-build/gcc-debug/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/tools-build/gcc-debug/build-x86_64-linux/gcc/ -O2
-fno-var-tracking-assignments -g3 -c foo.c -gsplit-dwarf
[hjl@gnu-cfl-1 pr79342]$ readelf -w foo.o > bad
readelf: Error: Unknown macro opcode 22 seen
readelf: Error: Unknown macro opcode d3 seen
[hjl@gnu-cfl-1 pr79342]$
/export/build/gnu/tools-build/gcc-debug/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/tools-build/gcc-debug/build-x86_64-linux/gcc/ -O2
-fno-var-tracking-assignments -g3 -c foo.c
[hjl@gnu-cfl-1 pr79342]$ readelf -w foo.o > good
[hjl@gnu-cfl-1 pr79342]$
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Subject: [Bug target/87471] New: AVX512F gather in Intel syntax is incompatible with binutils 2.32
Date: Sun, 30 Sep 2018 13:53:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87471
Bug ID: 87471
Summary: AVX512F gather in Intel syntax is incompatible with
binutils 2.32
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
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CC: jbeulich at novell dot com, ubizjak at gmail dot com
Target Milestone: ---
Target: i386,x86-64
With binutils commit:
commit 6ff00b5e12e7256738d9a4dac66e5a7745b771ea
Author: Jan Beulich <jbeulich@novell.com>
Date: Tue Jul 31 10:55:17 2018 +0200
x86/Intel: correct permitted operand sizes for AVX512 scatter/gather
AVX gather insns correctly allow the element size to be specified rather
than the full vector size. Make AVX512 ones match.
https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=6ff00b5e12e7256738d9a4dac66e5a7745b771ea
I got
$ /export/build/gnu/tools-build/gcc-8-debug/build-x86_64-linux/gcc/xgcc
-B/export/build/gnu/tools-build/gcc-8-debug/build-x86_64-linux/gcc/
-fno-diagnostics-show-caret -fdiagnostics-color=never -Ofast -mavx512vl
-masm=intel -c
/export/gnu/import/git/sources/gcc-release/gcc/testsuite/gcc.target/i386/avx512vl-pr79299-2.c
/tmp/ccOjp0RP.s: Assembler messages:
/tmp/ccOjp0RP.s:12: Error: operand size mismatch for `vgatherdps'
/tmp/ccOjp0RP.s:26: Error: operand size mismatch for `vgatherdps'
/tmp/ccOjp0RP.s:40: Error: operand size mismatch for `vgatherdpd'
/tmp/ccOjp0RP.s:54: Error: operand size mismatch for `vgatherdpd'
/tmp/ccOjp0RP.s:68: Error: operand size mismatch for `vgatherqps'
/tmp/ccOjp0RP.s:81: Error: operand size mismatch for `vgatherqps'
/tmp/ccOjp0RP.s:94: Error: operand size mismatch for `vgatherqpd'
/tmp/ccOjp0RP.s:108: Error: operand size mismatch for `vgatherqpd'
/tmp/ccOjp0RP.s:122: Error: operand size mismatch for `vpgatherdd'
/tmp/ccOjp0RP.s:136: Error: operand size mismatch for `vpgatherdd'
/tmp/ccOjp0RP.s:150: Error: operand size mismatch for `vpgatherdq'
/tmp/ccOjp0RP.s:164: Error: operand size mismatch for `vpgatherdq'
/tmp/ccOjp0RP.s:178: Error: operand size mismatch for `vpgatherqd'
/tmp/ccOjp0RP.s:191: Error: operand size mismatch for `vpgatherqd'
/tmp/ccOjp0RP.s:204: Error: operand size mismatch for `vpgatherqq'
/tmp/ccOjp0RP.s:218: Error: operand size mismatch for `vpgatherqq'
/tmp/ccOjp0RP.s:232: Error: operand size mismatch for `vgatherdps'
/tmp/ccOjp0RP.s:246: Error: operand size mismatch for `vgatherdps'
/tmp/ccOjp0RP.s:260: Error: operand size mismatch for `vgatherdpd'
/tmp/ccOjp0RP.s:274: Error: operand size mismatch for `vgatherdpd'
/tmp/ccOjp0RP.s:287: Error: operand size mismatch for `vgatherqps'
/tmp/ccOjp0RP.s:301: Error: operand size mismatch for `vgatherqps'
/tmp/ccOjp0RP.s:315: Error: operand size mismatch for `vgatherqpd'
/tmp/ccOjp0RP.s:329: Error: operand size mismatch for `vgatherqpd'
/tmp/ccOjp0RP.s:343: Error: operand size mismatch for `vpgatherdd'
/tmp/ccOjp0RP.s:357: Error: operand size mismatch for `vpgatherdd'
/tmp/ccOjp0RP.s:371: Error: operand size mismatch for `vpgatherdq'
/tmp/ccOjp0RP.s:385: Error: operand size mismatch for `vpgatherdq'
/tmp/ccOjp0RP.s:398: Error: operand size mismatch for `vpgatherqd'
/tmp/ccOjp0RP.s:412: Error: operand size mismatch for `vpgatherqd'
/tmp/ccOjp0RP.s:426: Error: operand size mismatch for `vpgatherqq'
/tmp/ccOjp0RP.s:440: Error: operand size mismatch for `vpgatherqq'
/tmp/ccOjp0RP.s:454: Error: operand size mismatch for `vgatherdps'
/tmp/ccOjp0RP.s:467: Error: operand size mismatch for `vgatherdps'
/tmp/ccOjp0RP.s:480: Error: operand size mismatch for `vgatherdpd'
/tmp/ccOjp0RP.s:493: Error: operand size mismatch for `vgatherdpd'
/tmp/ccOjp0RP.s:506: Error: operand size mismatch for `vgatherqps'
/tmp/ccOjp0RP.s:521: Error: operand size mismatch for `vgatherqps'
/tmp/ccOjp0RP.s:534: Error: operand size mismatch for `vgatherqpd'
/tmp/ccOjp0RP.s:547: Error: operand size mismatch for `vgatherqpd'
/tmp/ccOjp0RP.s:560: Error: operand size mismatch for `vpgatherdd'
/tmp/ccOjp0RP.s:573: Error: operand size mismatch for `vpgatherdd'
/tmp/ccOjp0RP.s:586: Error: operand size mismatch for `vpgatherdq'
/tmp/ccOjp0RP.s:599: Error: operand size mismatch for `vpgatherdq'
/tmp/ccOjp0RP.s:612: Error: operand size mismatch for `vpgatherqd'
/tmp/ccOjp0RP.s:627: Error: operand size mismatch for `vpgatherqd'
/tmp/ccOjp0RP.s:640: Error: operand size mismatch for `vpgatherqq'
/tmp/ccOjp0RP.s:653: Error: operand size mismatch for `vpgatherqq'
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Subject: [Bug fortran/87359] [9 regression] pointer being freed was not allocated
Date: Sun, 30 Sep 2018 13:55:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87359
--- Comment #45 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Sun Sep 30 13:52:55 2018
New Revision: 264725
URL: https://gcc.gnu.org/viewcvs?rev=264725&root=gcc&view=rev
Log:
2018-09-30 Paul Thomas <pault@gcc.gnu.org>
PR fortran/87359
* trans-array.c (gfc_is_reallocatable_lhs): Correct the problem
introduced by r264358, which prevented components of associate
names from being reallocated on assignment.
2018-09-30 Paul Thomas <pault@gcc.gnu.org>
PR fortran/87359
* gfortran.dg/associate_40.f90 : New test.
Added:
trunk/gcc/testsuite/gfortran.dg/associate_40.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/trans-array.c
trunk/gcc/testsuite/ChangeLog
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From: "matthijsvanduin at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/70792] Incorrect sequence point warning with uniform initializer syntax
Date: Sun, 30 Sep 2018 17:19:00 -0000
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Matthijs van Duin <matthijsvanduin at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |matthijsvanduin at gmail dot com
--- Comment #4 from Matthijs van Duin <matthijsvanduin at gmail dot com> ---
It seems bug 51253 previously addressed this, which means this is a regression.
Also bug 65866 exists for the warning itself.
I can confirm incorrect code generation using g++ 8.2.0 on this simpler
testcase:
#include <utility>
int main() {
int i = -1;
return std::pair{ ++i, ++i }.first;
}
$ g++ -Wall -std=c++17 -o list-init-sequence{,.cc}
list-init-sequence.cc: In function ‘int main()’:
list-init-sequence.cc:6:20: warning: operation on ‘i’ may be undefined
[-Wsequence-point]
return std::pair{ ++i, ++i }.first;
^~~
$ ./list-init-sequence || echo fail
fail
Interestingly, this variation does not produce a warning but still produces
incorrect code:
#include <utility>
int main() {
int i = 0;
return std::pair{ i, ++i }.first;
}
$ g++ -Wall -std=c++17 -o list-init-sequence{,.cc}
$ ./list-init-sequence || echo fail
fail
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/51253] [C++11][DR 1030] Evaluation order (sequenced-before relation) among initializer-clauses in braced-init-list
Date: Sun, 30 Sep 2018 17:20:00 -0000
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Matthijs van Duin <matthijsvanduin at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |matthijsvanduin at gmail dot com
--- Comment #23 from Matthijs van Duin <matthijsvanduin at gmail dot com> ---
There appears to be a regression of this bug. See bug 70792.
>From gcc-bugs-return-616610-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Sep 30 17:19:11 2018
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From: "janus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/87460] [F03] accepts-invalid bug with ASSOCIATE and array argument
Date: Sun, 30 Sep 2018 17:53:00 -0000
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janus at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
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--- Comment #3 from janus at gcc dot gnu.org ---
I have a patch that rejects the test case in comment #0 (which was not quite as
easy as I had hoped):
https://github.com/janusw/gcc/commit/3c61e2ba43df8f2087dac5baaa673d2a7cfbd1b3
Unfortunately it currently ICEs on several associate_* test cases in the
testsuite, and it's not quite clear to me why.
>From gcc-bugs-return-616611-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Sep 30 17:20:41 2018
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Subject: =?UTF-8?B?W0J1ZyBjKysvODY0NjVdIEMrKzE3IDxvcHRpb25hbD4gdHJpZ2dlcnM6IA==?= =?UTF-8?B?4oCYPGFub255bW91cz7igJkgbWF5IGJlIHVzZWQgdW5pbml0aWFsaXplZCBp?= =?UTF-8?B?biB0aGlzIGZ1bmN0aW9u?Date: Sun, 30 Sep 2018 18:46:00 -0000
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--- Comment #3 from Pavel Roskin <proski at gnu dot org> ---
Created attachment 44770
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44770&action=edit
Futher reduced example
I was able to reduce the example to just 55 lines, removing almost all the code
that came from the standard headers. The code complies with C++ standards all
the way back to C++03.
As I suspected, the implementation of std::optional in libstdc++ uses a trick
to avoid initializing the payload when the optional value default initialized,
and that code turns out to be essential for reproducing the issue.
Try uncommenting _empty_char, and the warning goes away.
>From gcc-bugs-return-616612-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Sep 30 17:53:35 2018
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Subject: [Bug c++/87407] Enhance -Wunused-function to handle also inline functions
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |howarth.at.gcc at gmail dot com,
| |palves at redhat dot com
See Also| |https://bugs.llvm.org/show_
| |bug.cgi?id=22712
--- Comment #14 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #13)
> (In reply to Andrew Pinski from comment #5)
> > Test the warning out on clang from a header file and you will see you get
> > the warning in the header too. As I said I actually ran into this while
> > working on the vpp project and cursed clang for having this warning turned
> > on.
>
> I think something similar happened with the gdb project; I'll try to find it
> later...
Right, found it, thread starting here:
https://sourceware.org/ml/gdb/2015-02/msg00045.html
cc-ing people from it.
Also, corresponding clang bug is here:
https://bugs.llvm.org/show_bug.cgi?id=22712
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Subject: [Bug fortran/87352] [7/8/9 Regression] Large stack usage with new gfortran
Date: Sun, 30 Sep 2018 19:35:00 -0000
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |compile-time-hog,
| |memory-hog
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-30
CC| |tkoenig at gcc dot gnu.org
Target Milestone|--- |9.0
Summary|Large stack usage with new |[7/8/9 Regression] Large
|gfortran |stack usage with new
| |gfortran
Ever confirmed|0 |1
--- Comment #1 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
4.8 is OK, 7, 8, and 9 all show the same kind of behavior.
Size of *.original with 4.8:
-rw-r--r-- 1 ig25 users 119187 30. Sep 20:40 big.f90.003t.original
Size of *.original with recent trunk:
-rw-r--r-- 1 ig25 users 17933202 30. Sep 20:41 big.f90.004t.original
so we are generating a factor of 15 more code.
>From gcc-bugs-return-616614-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Sep 30 18:47:12 2018
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Subject: [Bug fortran/87352] [7/8/9 Regression] Large stack usage with new gfortran
Date: Sun, 30 Sep 2018 19:46:00 -0000
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--- Comment #2 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
(In reply to Thomas Koenig from comment #1)
> so we are generating a factor of 15 more code.
I mean 150.
>From gcc-bugs-return-616615-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Sep 30 19:35:09 2018
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Subject: [Bug middle-end/41453] use INTENT(out) for optimization
Date: Sun, 30 Sep 2018 20:03:00 -0000
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--- Comment #5 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Still missing: To clobber
- ariables passed by reference to the caller
- saved variables
- associated variables (there are passed as pointers to
the associate blocsk)
- intent(out) variables on entry to the procedure.
>From gcc-bugs-return-616618-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 02:16:25 2018
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Subject: [Bug tree-optimization/87473] New: [7/8/9 Regression] ICE in create_add_on_incoming_edge, at gimple-ssa-strength-reduction.c:2344
Date: Mon, 01 Oct 2018 02:16:00 -0000
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Bug ID: 87473
Summary: [7/8/9 Regression] ICE in create_add_on_incoming_edge,
at gimple-ssa-strength-reduction.c:2344
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-on-invalid-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
gcc-9.0.0-alpha20180923 snapshot (r264518), 8.2, 7.3 ICE when compiling the
following snippet w/ -O3 -fno-tree-ch:
void
t6 (int qz, int wh)
{
int jl = wh;
while (1.0 / 0 < 1)
{
qz = wh * (wh + 2);
while (wh < 1)
jl = 0;
}
while (qz < 1)
qz = jl * wh;
}
% gcc-9.0.0-alpha20180923 -O3 -fno-tree-ch -w -c ufqwb34v.c
during GIMPLE pass: slsr
ufqwb34v.c: In function 't6':
ufqwb34v.c:2:1: internal compiler error: in create_add_on_incoming_edge, at
gimple-ssa-strength-reduction.c:2344
2 | t6 (int qz, int wh)
| ^~
0x14a2850 create_add_on_incoming_edge
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/gimple-ssa-strength-reduction.c:2344
0x14a2c53 create_phi_basis_1
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/gimple-ssa-strength-reduction.c:2447
0x14a3111 create_phi_basis
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/gimple-ssa-strength-reduction.c:2495
0x14a4a1d replace_profitable_candidates
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/gimple-ssa-strength-reduction.c:3844
0x14a8d7b analyze_candidates_and_replace
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/gimple-ssa-strength-reduction.c:3944
0x14a8d7b execute
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180923/work/gcc-9-20180923/gcc/gimple-ssa-strength-reduction.c:4022
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--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to bin cheng from comment #3)
> Oh I just applied patch changing warning into missed optimization message,
> but yes the issue still exist using -fopt-info-loop-missed.
David has been changing -fopt-info-* stuff lately; has that affected this at
all?
>From gcc-bugs-return-616620-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 04:14:05 2018
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Subject: [Bug c/87348] Implement -Watomic-implicit-seq-cst
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-01
CC| |egallager at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Eric Gallager <egallager at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-616621-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 04:22:11 2018
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Subject: [Bug c++/87408] Enhance -Wunused-value to catch more complex expressions
Date: Mon, 01 Oct 2018 04:22:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=66658,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=58950,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=64639
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
I thought this might be a dup of something, but the closest things I can find
are bug 66658, bug 58950, and bug 64639, but none of them are quite what I was
looking for and are only "related" at best...
>From gcc-bugs-return-616622-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 06:35:32 2018
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Subject: [Bug c++/87373] Packed structs are not handled properly on ARM architecture even with misaligned access is enabled
Date: Mon, 01 Oct 2018 06:35:00 -0000
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Murat UrsavaÅŸ <murat.ursavas at gmail dot com> changed:
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--- Comment #34 from Murat UrsavaÅŸ <murat.ursavas at gmail dot com> ---
I think I've got what's going on. (I know this case turned to a monologue, but
I would like to improve it for the future search references.
In ARM architecture we have one simple linear address space for everything,
flash, RAM and other hardware like peripherals. This makes many things quite
easy.
If you would like to setup a USART, you just write some information on this
address space and you get what you want, like in this case. But If you are like
me, trying to make everything deterministic, you may want to enable
packed-structs. No problem with that. GCC takes care of the rest. It can access
the RAM unaligned anyway as default.
But, one thing can stay under the radar. We see peripheral registers as usual
RAM addresses, but they are not. They may have limitations like no unaligned
access.
In this case with GCC 4.9.3, if I access to the register it uses this:
ldr r3,[pc,#0x4c]
ldr r2,[r3,#0x54]
movs r2,#0x0
orr r2,r2,#0xb
str r2,[r3,#0x54] ;<<<< Important instruction
This part easily sets a 32bit register and everything works as expected.
But after GCC 5+, It uses byte by byte access an uses the instructions below;
ldr r3,[pc,#0x70]
ldrb.w r2,[r3,#0x54]
movs r2,#0x0
orr r2,r2,#0xb
strb.w r2,[r3,#0x54] ;<<<< Important instruction
ldrb.w r2,[r3,#0x55]
movs r2,#0x0
strb.w r2,[r3,#0x55]
ldrb.w r2,[r3,#0x56]
movs r2,#0x0
strb.w r2,[r3,#0x56]
ldrb.w r2,[r3,#0x57]
movs r2,#0x0
strb.w r2,[r3,#0x57]
There is nothing wrong, if it was a normal RAM location. It would set the
register as 0x0000000b. But since this is a peripheral location, and has to be
accessed as aligned, it takes just the first strb.w instruction into
consideration, and leaves further ones useless. 0 - 7bits are OK, but 8-31 bits
are left to decide by entropy. In my case the entropy wants to move the
physical pins to a different location.
I'm not sure whether this is a GCC regression, or must be taken care by the
hardware manufacturer, but this is my conclusion at the end.
So what will be my workaround;
Project wide packed structs are dangerous, I'll remove it from the project
settings and limit it down to necessary structs, leaving others relaxed. This
should make the peripheral access aligned.
P.S: I'm reopening this record for one final evaluation by the GNU team. From
my perspective, this looks like a regression, but it's up to you guys.
>From gcc-bugs-return-616623-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 06:51:12 2018
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Subject: [Bug target/87474] New: ICE in extract_insn, at recog.c:2305
Date: Mon, 01 Oct 2018 06:51:00 -0000
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Bug ID: 87474
Summary: ICE in extract_insn, at recog.c:2305
Product: gcc
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Following causes ICE:
$ ppc64le-linux-gnu-gcc
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/tree-ssa/pr84969.c -c
-mno-power8-vector
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/tree-ssa/pr84969.c: In
function ‘foo’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/tree-ssa/pr84969.c:47:1:
error: unrecognizable insn:
47 | }
| ^
(insn 202 201 203 19 (set (reg:V16QI 237)
(ior:V16QI (not:V16QI (reg:V16QI 239))
(reg:V16QI 240)))
"/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/tree-ssa/pr84969.c":45 -1
(nil))
during RTL pass: vregs
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/tree-ssa/pr84969.c:47:1:
internal compiler error: in extract_insn, at recog.c:2305
0x5714f3 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/rtl-error.c:108
0x57150f _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/rtl-error.c:116
0x5709fc extract_insn(rtx_insn*)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/recog.c:2305
0x7b6caf instantiate_virtual_regs_in_insn
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/function.c:1605
0x7b6caf instantiate_virtual_regs
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/function.c:1975
0x7b6caf execute
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/function.c:2024
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Subject: [Bug target/87475] New: ICE in patch_jump_insn, at cfgrtl.c:1275
Date: Mon, 01 Oct 2018 07:02:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87475
Bug ID: 87475
Summary: ICE in patch_jump_insn, at cfgrtl.c:1275
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
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CC: ktkachov at gcc dot gnu.org
Target Milestone: ---
Following causes ICE:
$ cat ice.cpp
struct a {
a();
~a();
};
int b(a, a);
void c(bool d) { d ? b(a(), a()) : 0; }
$ aarch64-linux-gnu-gcc ice.cpp -O2 -freorder-blocks-and-partition
-fmodulo-sched -c
during RTL pass: sms
ice.cpp: In function ‘void c(bool)’:
ice.cpp:6:39: internal compiler error: in patch_jump_insn, at cfgrtl.c:1275
6 | void c(bool d) { d ? b(a(), a()) : 0; }
| ^
0x5ca3e1 patch_jump_insn
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-aarch64/build/gcc/cfgrtl.c:1275
0x7fadb1 redirect_branch_edge
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-aarch64/build/gcc/cfgrtl.c:1301
0x7fb83a cfg_layout_redirect_edge_and_branch
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-aarch64/build/gcc/cfgrtl.c:4454
0x7e86c9 redirect_edge_and_branch(edge_def*, basic_block_def*)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-aarch64/build/gcc/cfghooks.c:369
0x1123b31 try_forward_edges
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-aarch64/build/gcc/cfgcleanup.c:550
0x1123b31 try_optimize_cfg
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-aarch64/build/gcc/cfgcleanup.c:2942
0x1123b31 cleanup_cfg(int)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-aarch64/build/gcc/cfgcleanup.c:3156
0x1214dec execute
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-aarch64/build/gcc/modulo-sched.c:3336
>From gcc-bugs-return-616625-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 07:11:10 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug sanitizer/87453] Maybe implement -fsanitize=float-cast-overflow and -fsanitize=float-divide-by-zero
Date: Mon, 01 Oct 2018 07:11:00 -0000
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
>
> Is there information on why Clang implemented those two options, was there
> significant demand for those kinds specifically?
I don't know, I just copied that as I saw it in LLVM's release notes.
>From gcc-bugs-return-616626-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 08:46:38 2018
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Subject: [Bug fortran/38936] [F03] ASSOCIATE construct / improved SELECT TYPE (a=>expr)
Date: Mon, 01 Oct 2018 08:46:00 -0000
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--- Comment #20 from Jürgen Reuter <juergen.reuter at desy dot de> ---
Repeating Dominique's question: this seems complete (or almost complete). Is
there anything left? This is one of the last three non-green items in
https://gcc.gnu.org/wiki/Fortran2003Status
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Subject: [Bug c++/87464] Gcc reports hard error instead of SFINAE out the related method
Date: Mon, 01 Oct 2018 08:49:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Thus invalid.
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Subject: [Bug tree-optimization/87465] [8/9 Regression] Loop removal regression
Date: Mon, 01 Oct 2018 09:08:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-09-29
Target Milestone|9.0 |8.3
Ever confirmed|0 |1
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |missed-optimization
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |rguenth at gcc dot gnu.org
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Agreed. Note we do have such brute-forcing but only quite limited with
loop_niter_by_eval ().
Note that with -funroll-loops (or -O3) we peel the innermost loop
but then
Not unrolling loop 1: number of branches on hot path in the unrolled sequence
reaches --param max-peel-branches limit.
But I have a simple fix for the testcase...
Index: gcc/tree-ssa-loop-ivcanon.c
===================================================================
--- gcc/tree-ssa-loop-ivcanon.c (revision 264734)
+++ gcc/tree-ssa-loop-ivcanon.c (working copy)
@@ -368,8 +368,8 @@ tree_estimate_loop_size (struct loop *lo
size->non_call_stmts_on_hot_path++;
if (((gimple_code (stmt) == GIMPLE_COND
&& (!constant_after_peeling (gimple_cond_lhs (stmt), stmt,
loop)
- || constant_after_peeling (gimple_cond_rhs (stmt), stmt,
- loop)))
+ || !constant_after_peeling (gimple_cond_rhs (stmt), stmt,
+ loop)))
|| (gimple_code (stmt) == GIMPLE_SWITCH
&& !constant_after_peeling (gimple_switch_index (
as_a <gswitch *> (stmt)),
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Subject: [Bug target/87474] ICE in extract_insn, at recog.c:2305
Date: Mon, 01 Oct 2018 09:10:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(Needs -mcpu=power8) (or later). Confirmed.
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Subject: [Bug rtl-optimization/87468] [9 Regression] ice "wrong amount of branch edges after conditional jump in bb"
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |needs-bisection
Target| |x86_64-*-*, i?86-*-*
Priority|P3 |P1
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-01
Ever confirmed|0 |1
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
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From: "ktkachov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug rtl-optimization/87475] [8/9 Regression] ICE in patch_jump_insn, at cfgrtl.c:1275
Date: Mon, 01 Oct 2018 09:18:00 -0000
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ktkachov at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Known to work| |7.3.1
Last reconfirmed| |2018-10-01
Component|target |rtl-optimization
CC| |abel at gcc dot gnu.org
Ever confirmed|0 |1
Summary|ICE in patch_jump_insn, at |[8/9 Regression] ICE in
|cfgrtl.c:1275 |patch_jump_insn, at
| |cfgrtl.c:1275
Known to fail| |8.2.1, 9.0
--- Comment #1 from ktkachov at gcc dot gnu.org ---
Confirmed from GCC 8 onwards. Looks like a modulo scheduling bug?
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Subject: [Bug c++/87469] [9 Regression] ice in record_estimate, at tree-ssa-loop-niter.c:3271
Date: Mon, 01 Oct 2018 09:19:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P1
Status|UNCONFIRMED |NEW
Version|8.0 |9.0
Keywords| |ice-on-valid-code,
| |needs-bisection
Last reconfirmed| |2018-10-01
Ever confirmed|0 |1
Summary|ice in record_estimate, at |[9 Regression] ice in
|tree-ssa-loop-niter.c:3271 |record_estimate, at
| |tree-ssa-loop-niter.c:3271
Target Milestone|--- |9.0
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
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Subject: [Bug rtl-optimization/87475] [8/9 Regression] ICE in patch_jump_insn, at cfgrtl.c:1275
Date: Mon, 01 Oct 2018 09:20:00 -0000
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to ktkachov from comment #1)
> Confirmed from GCC 8 onwards. Looks like a modulo scheduling bug?
I guess so.
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Subject: [Bug target/87474] ICE in extract_insn, at recog.c:2305
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |acsawdey at gcc dot gnu.org
--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> ---
It is created by __builtin_strcmp.
>From gcc-bugs-return-616634-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 09:20:16 2018
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Subject: [Bug go/87470] [9 Regression] libgo/go/runtime/malloc.go failed to build with -mx32
Date: Mon, 01 Oct 2018 09:20:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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>From gcc-bugs-return-616636-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 09:24:47 2018
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Subject: [Bug debug/87472] Unknown macro opcode with -gsplit-dwarf -g3
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed with GCC 8 and just -g3 -gsplit-dwarf. readelf isn't very verbose of
which macro section it complains about though...
Mark?
>From gcc-bugs-return-616637-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 09:27:07 2018
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Subject: [Bug sanitizer/87453] Maybe implement -fsanitize=float-cast-overflow and -fsanitize=float-divide-by-zero
Date: Mon, 01 Oct 2018 09:27:00 -0000
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
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--- Comment #4 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
Oops - actually both were implemented by Marek in 2014 and appeared in gcc-5
with exactly those option names. So, nothing to do here.
>From gcc-bugs-return-616638-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 09:49:30 2018
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Subject: [Bug target/84039] x86 retpolines and CFI
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Florian Weimer <fw at gcc dot gnu.org> changed:
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See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=87414
--- Comment #6 from Florian Weimer <fw at gcc dot gnu.org> ---
Sorry, but why is this bug in WAITING?
>From gcc-bugs-return-616639-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 09:54:08 2018
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Subject: [Bug c++/87373] Byte by byte accessing to the peripheral registers causes issues on ARM v7-m architecture
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Richard Earnshaw <rearnsha at gcc dot gnu.org> changed:
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--- Comment #35 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
I haven't researched the history of this change, but it was probably
deliberate. Device memory on processors (a memory classification that implies
that the underlying contents may contain memory mapped devices that have side
effects) is generally intolerant of misaligned accesses. As such, emitting an
unaligned access to it may cause the system to fault.
If that was the reason for the change to GCC, it won't be reversed. (The fact
that in your example the optimizers discover the alignment and change the code
back to an aligned access does not alter this general observation.)
>From gcc-bugs-return-616640-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 10:01:21 2018
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Subject: [Bug sanitizer/87453] Maybe implement -fsanitize=float-cast-overflow and -fsanitize=float-divide-by-zero
Date: Mon, 01 Oct 2018 10:01:00 -0000
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--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Great, thanks.
>From gcc-bugs-return-616641-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 10:23:49 2018
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From: "larsbj at gullik dot net" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87476] New: [9 Regression] char-array initialized from wide-string
Date: Mon, 01 Oct 2018 10:23:00 -0000
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Bug ID: 87476
Summary: [9 Regression] char-array initialized from wide-string
Product: gcc
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Created attachment 44771
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44771&action=edit
Source showing error
Using g++ -v
Using built-in specs.
COLLECT_GCC=/opt/gcc/gcc-9/bin/g++
COLLECT_LTO_WRAPPER=/opt/gcc/gcc-9/libexec/gcc/x86_64-pc-linux-gnu/9.0.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ../gcc/configure --prefix=/opt/gcc/gcc-9
--enable-checking=release --enable-languages=c,c++
Thread model: posix
gcc version 9.0.0 20180925 (experimental) (GCC)
When compiling the attached source snippet I get:
g++ -c foo.cpp
foo.cpp: In instantiation of ‘void f< <template-parameter-1-1> >::operator()()
[with <template-parameter-1-1> = int]’:
foo.cpp:9:14: required from here
foo.cpp:4:33: error: char-array initialized from wide string
4 | constexpr unsigned char p[1]{};
|
With g++ --version
g++ (GCC) 8.1.1 20180712 (Red Hat 8.1.1-5)
this compiles without any errors.
>From gcc-bugs-return-616642-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 10:34:46 2018
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Subject: [Bug gcov-profile/87442] Add options to filter files we want to instrument for code coverage
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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>From gcc-bugs-return-616643-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 10:57:37 2018
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Subject: [Bug fortran/87477] New: [meta-bug] [F03] issues concerning the ASSOCIATE statement
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87477
Bug ID: 87477
Summary: [meta-bug] [F03] issues concerning the ASSOCIATE
statement
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: janus at gcc dot gnu.org
Target Milestone: ---
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Subject: [Bug tree-optimization/87261] Optimize bool expressions
Date: Mon, 01 Oct 2018 11:26:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87261
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug tree-optimization/87261] Optimize bool expressions
Date: Mon, 01 Oct 2018 11:26:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87261
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Oct 1 11:25:45 2018
New Revision: 264744
URL: https://gcc.gnu.org/viewcvs?rev=264744&root=gcc&view=rev
Log:
2018-10-01 MCC CS <deswurstes@users.noreply.github.com>
PR tree-optimization/87261
* match.pd: Remove trailing whitespace.
Add (x & y) | ~(x | y) -> ~(x ^ y),
(~x | y) ^ (x ^ y) -> x | ~y and (x ^ y) | ~(x | y) -> ~(x & y)
* gcc.dg/pr87261.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr87261.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/match.pd
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug rtl-optimization/87475] [8/9 Regression] ICE in patch_jump_insn, at cfgrtl.c:1275
Date: Mon, 01 Oct 2018 11:39:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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>From gcc-bugs-return-616646-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 11:39:09 2018
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Subject: [Bug c++/87476] [9 Regression] char-array initialized from wide-string
Date: Mon, 01 Oct 2018 11:39:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |needs-bisection,
| |rejects-valid
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-01
Version|unknown |9.0
Target Milestone|--- |9.0
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
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Subject: [Bug tree-optimization/87473] [7/8/9 Regression] ICE in create_add_on_incoming_edge, at gimple-ssa-strength-reduction.c:2344
Date: Mon, 01 Oct 2018 11:46:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|ice-on-invalid-code |ice-on-valid-code
Priority|P3 |P2
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-01
CC| |wschmidt at gcc dot gnu.org
Target Milestone|--- |7.4
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
#1 0x0000000001e11b98 in create_add_on_incoming_edge (c=0x2fc4000, basis_name=
<ssa_name 0x7ffff69e12d0>, increment=...,
e=<edge 0x7ffff69d6d20 (5 -> 6)>, loc=2147483670, known_stride=false)
at /tmp/trunk2/gcc/gimple-ssa-strength-reduction.c:2344
2344 gcc_unreachable ();
(gdb) p increment
$1 = {<fixed_wide_int_storage<192>> = {val = {-2, -1, 140737488345120,
10789461}, len = 1}, static is_sign_extended = <optimized out>}
(so the value is -2)
from
/* If the phi argument is the base name of the CAND_PHI, then
this incoming arc should use the hidden basis. */
if (operand_equal_p (arg, phi_cand->base_expr, 0))
if (basis->index == 0)
feeding_def = gimple_assign_lhs (basis->cand_stmt);
else
{
widest_int incr = -basis->index;
feeding_def = create_add_on_incoming_edge (c, basis_name, incr,
e, loc, known_stride);
}
we get there with basis->index == 2, eventually generated from
_16 = _15 + 2;
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Subject: [Bug fortran/41599] [OOP] SELECT TYPE with associate-name => exp: Use (sometimes) a restricted pointer
Date: Mon, 01 Oct 2018 11:46:00 -0000
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Paul Thomas <pault at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |pault at gcc dot gnu.org
--- Comment #5 from Paul Thomas <pault at gcc dot gnu.org> ---
(In reply to Dominique d'Humieres from comment #4)
> I still get an ICE when compiling the second test in comment 3 with r228594.
From 7.3.1 onwards, this now gives the correct error:
Error: Component ‘bar’ with CLASS at (1) must be allocatable or pointer
6.4.1 ICEs still.
It seems to me that this should be closed.
Paul
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Subject: [Bug fortran/87359] [9 regression] pointer being freed was not allocated
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Jürgen Reuter <juergen.reuter at desy dot de> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |FIXED
--- Comment #46 from Jürgen Reuter <juergen.reuter at desy dot de> ---
Checked (again) that with our code which triggered this reproducer everything
works fine again, taking as reference r264725.
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Subject: [Bug fortran/38936] [F03] ASSOCIATE construct / improved SELECT TYPE (a=>expr)
Date: Mon, 01 Oct 2018 11:49:00 -0000
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Paul Thomas <pault at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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--- Comment #21 from Paul Thomas <pault at gcc dot gnu.org> ---
Now replaced with the meta-bug set up by Janus.
Paul
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Subject: [Bug fortran/20585] [meta-bug] Fortran 2003 support
Date: Mon, 01 Oct 2018 11:49:00 -0000
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Bug 20585 depends on bug 38936, which changed state.
Bug 38936 Summary: [F03] ASSOCIATE construct / improved SELECT TYPE (a=>expr)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38936
What |Removed |Added
----------------------------------------------------------------------------
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>From gcc-bugs-return-616654-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 11:49:41 2018
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Subject: [Bug fortran/44044] [OOP] SELECT TYPE with class-valued function
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Bug 44044 depends on bug 38936, which changed state.
Bug 38936 Summary: [F03] ASSOCIATE construct / improved SELECT TYPE (a=>expr)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38936
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----------------------------------------------------------------------------
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Subject: [Bug fortran/87477] [meta-bug] [F03] issues concerning the ASSOCIATE statement
Date: Mon, 01 Oct 2018 11:49:00 -0000
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Bug 87477 depends on bug 38936, which changed state.
Bug 38936 Summary: [F03] ASSOCIATE construct / improved SELECT TYPE (a=>expr)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=38936
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>From gcc-bugs-return-616655-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 12:45:00 2018
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From: "mario.bielert@tu-dresden.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87478] New: Hidden member function falsely takes part in qualified name lookup
Date: Mon, 01 Oct 2018 12:45:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87478
Bug ID: 87478
Summary: Hidden member function falsely takes part in qualified
name lookup
Product: gcc
Version: unknown
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Priority: P3
Component: c++
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Created attachment 44772
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44772&action=edit
Example code, which should be rejected
In the attached example, a base class is defined with a member function
template and a derived class is defined with the same member function template.
Both member function templates have the same parameter list but are SFINAE'd
with exclusive conditions.
However, according to http://eel.is/c++draft/namespace.udecl#1 hidden functions
shall not participate in the name lookup and the base function template is
hidden according to http://eel.is/c++draft/namespace.udecl#15. Therefore, the
example code should be rejected, but it compiles without warnings.
The issue came up on this stackoverflow question:
https://stackoverflow.com/questions/52590220/name-lookup-error-of-enable-ifd-inherited-member-functions
>From gcc-bugs-return-616656-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 12:46:56 2018
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Subject: [Bug c++/65667] [5 Regression] FAIL: g++.dg/cpp0x/pr57101.C -std=gnu++11 (test for excess errors)
Date: Mon, 01 Oct 2018 12:46:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65667
Paul Thomas <pault at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |pault at gcc dot gnu.org
--- Comment #5 from Paul Thomas <pault at gcc dot gnu.org> ---
(In reply to Paul Thomas from comment #4)
> Author: pault
> Date: Sat Sep 29 17:17:09 2018
> New Revision: 264715
>
> URL: https://gcc.gnu.org/viewcvs?rev=264715&root=gcc&view=rev
> Log:
> 2018-09-29 Paul Thomas <pault@gcc.gnu.org>
>
> PR fortran/65667
> * trans-expr.c (gfc_trans_assignment_1): If there is dependency
> fix the rse stringlength.
>
> 2018-09-29 Paul Thomas <pault@gcc.gnu.org>
>
> PR fortran/65667
> * gfortran.dg/dependency_52.f90 : New test.
>
>
> Added:
> trunk/gcc/testsuite/gfortran.dg/dependency_52.f90
> Modified:
> trunk/gcc/fortran/ChangeLog
> trunk/gcc/fortran/trans-expr.c
> trunk/gcc/testsuite/ChangeLog
Sorry for the noise - this should have been PR65677.
Paul
>From gcc-bugs-return-616659-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 12:49:58 2018
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Subject: [Bug rtl-optimization/87479] New: [9 Regression] FAIL: gcc.target/i386/pr63527.c
Date: Mon, 01 Oct 2018 12:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87479
Bug ID: 87479
Summary: [9 Regression] FAIL: gcc.target/i386/pr63527.c
Product: gcc
Version: 9.0
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On i686, r264726 caused:
FAIL: gcc.target/i386/pr63527.c scan-assembler-not movl[ \t]%[^,]+, %ebx
FAIL: gcc.target/i386/pr63534.c scan-assembler-not movl[ \t]%[^,]+, %ebx
FAIL: gcc.target/i386/pr64317.c scan-assembler addl[
\\t]+[$]_GLOBAL_OFFSET_TABLE_, %ebx
FAIL: gcc.target/i386/pr64317.c scan-assembler movl[ \\t]+c@GOTOFF[(]%ebx[)]
>From gcc-bugs-return-616657-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 12:49:15 2018
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Subject: [Bug c++/70792] Incorrect sequence point warning with uniform initializer syntax
Date: Mon, 01 Oct 2018 12:49:00 -0000
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Matthijs van Duin from comment #4)
> It seems bug 51253 previously addressed this, which means this is a
> regression.
No. To be a regression it has to have previously worked, then stopped working.
All versions of GCC warn about this code, so it's not a regression.
The fix for bug 51253 only changed the code generation, it didn't stop the
warnings being printed.
>From gcc-bugs-return-616658-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 12:49:53 2018
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Subject: [Bug c++/51253] [C++11][DR 1030] Evaluation order (sequenced-before relation) among initializer-clauses in braced-init-list
Date: Mon, 01 Oct 2018 12:49:00 -0000
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--- Comment #24 from Jonathan Wakely <redi at gcc dot gnu.org> ---
There's no regression (see bug 70792 comment 5).
G++ still warns for the testcasese here, even though it produces the right code
now.
>From gcc-bugs-return-616660-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 12:53:11 2018
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Subject: [Bug c++/70792] Incorrect sequence point warning with uniform initializer syntax
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70792
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed|2017-08-24 00:00:00 |2018-10-1
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #5)
> The fix for bug 51253 only changed the code generation, it didn't stop the
> warnings being printed.
And it didn't affect the result for any of the testcases in this bug.
So it seems the fix for 51253 was simply incomplete, but there's no regression.
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Subject: [Bug target/86486] GCC 8 stack clash protection on AArch64 is incomplete
Date: Mon, 01 Oct 2018 12:54:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86486
--- Comment #1 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Author: tnfchris
Date: Mon Oct 1 12:53:34 2018
New Revision: 264748
URL: https://gcc.gnu.org/viewcvs?rev=264748&root=gcc&view=rev
Log:
stack-clash: Add LR assert to layout_frame.
Since stack clash depends on the LR being saved for non-leaf functions this
patch adds an assert such that if this changes we would notice this.
gcc/
PR target/86486
* config/aarch64/aarch64.c (aarch64_layout_frame): Add assert.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/aarch64/aarch64.c
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86486] GCC 8 stack clash protection on AArch64 is incomplete
Date: Mon, 01 Oct 2018 12:57:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86486
--- Comment #2 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Author: tnfchris
Date: Mon Oct 1 12:56:40 2018
New Revision: 264749
URL: https://gcc.gnu.org/viewcvs?rev=264749&root=gcc&view=rev
Log:
Add support for SVE stack clash probing.
This patch adds basic support for SVE stack clash protection.
It is a first implementation and will use a loop to do the
probing and stack adjustments.
An example sequence is:
.cfi_startproc
mov x15, sp
cntb x16, all, mul #11
add x16, x16, 304
.cfi_def_cfa_register 15
.SVLPSPL0:
cmp x16, 61440
b.lt .SVLPEND0
sub sp, sp, 61440
str xzr, [sp, 0]
sub x16, x16, 61440
b .SVLPSPL0
.SVLPEND0:
sub sp, sp, x16
.cfi_escape 0xf,0xc,0x8f,0,0x92,0x2e,0,0x8,0x58,0x1e,0x23,0xb0,0x2,0x22
for a 64KB guard size, and for a 4KB guard size
.cfi_startproc
mov x15, sp
cntb x16, all, mul #11
add x16, x16, 304
.cfi_def_cfa_register 15
.SVLPSPL0:
cmp x16, 3072
b.lt .SVLPEND0
sub sp, sp, 3072
str xzr, [sp, 0]
sub x16, x16, 3072
b .SVLPSPL0
.SVLPEND0:
sub sp, sp, x16
.cfi_escape 0xf,0xc,0x8f,0,0x92,0x2e,0,0x8,0x58,0x1e,0x23,0xb0,0x2,0x22
This has about the same semantics as alloca, except we prioritize the common
case
where no probe is required. We also change the amount we adjust the stack and
the probing interval to be the nearest value to `guard size - abi buffer` that
fits in the 12-bit shifted immediate used by cmp.
While this would mean we probe a bit more often than we require, in practice
the
amount of SVE vectors you'd need to spill is significant. Even more so to enter
the
loop more than once.
gcc/
PR target/86486
* config/aarch64/aarch64-protos.h
(aarch64_output_probe_sve_stack_clash): New.
* config/aarch64/aarch64.c (aarch64_output_probe_sve_stack_clash,
aarch64_clamp_to_uimm12_shift): New.
(aarch64_allocate_and_probe_stack_space): Add SVE specific section.
* config/aarch64/aarch64.md (probe_sve_stack_clash): New.
gcc/testsuite/
PR target/86486
* gcc.target/aarch64/stack-check-prologue-16.c: New test
* gcc.target/aarch64/stack-check-cfa-3.c: New test.
* gcc.target/aarch64/sve/struct_vect_24.c: New test.
* gcc.target/aarch64/sve/struct_vect_24_run.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-cfa-3.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-16.c
trunk/gcc/testsuite/gcc.target/aarch64/sve/struct_vect_24.c
trunk/gcc/testsuite/gcc.target/aarch64/sve/struct_vect_24_run.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/aarch64/aarch64-protos.h
trunk/gcc/config/aarch64/aarch64.c
trunk/gcc/config/aarch64/aarch64.md
trunk/gcc/testsuite/ChangeLog
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From: "tnfchris at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86486] GCC 8 stack clash protection on AArch64 is incomplete
Date: Mon, 01 Oct 2018 12:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86486
--- Comment #3 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Author: tnfchris
Date: Mon Oct 1 12:58:21 2018
New Revision: 264750
URL: https://gcc.gnu.org/viewcvs?rev=264750&root=gcc&view=rev
Log:
Add a hook to support telling the mid-end when to probe the stack.
This patch adds a hook to tell the mid-end about the probing requirements of
the
target. On AArch64 we allow a specific range for which no probing needs to
be done. This same range is also the amount that will have to be probed up
when
a probe is needed after dropping the stack.
Defining this probe comes with the extra requirement that the outgoing
arguments
size of any function that uses alloca and stack clash be at the very least 8
bytes. With this invariant we can skip doing the zero checks for alloca and
save some code.
A simplified version of the AArch64 stack frame is:
+-----------------------+
| |
| |
| |
+-----------------------+
|LR |
+-----------------------+
|FP |
+-----------------------+
|dynamic allocations | -\ probe range hook effects these
+-----------------------+ --\ and ensures that outgoing stack
|padding | -- args is always > 8 when alloca.
+-----------------------+ ---/ Which means it's always safe to probe
|outgoing stack args |-/ at SP
+-----------------------+
This allows us to generate better code than without the hook without affecting
other targets.
With this patch I am also removing the
stack_clash_protection_final_dynamic_probe
hook which was added specifically for AArch64 but that is no longer needed.
gcc/
PR target/86486
* explow.c (anti_adjust_stack_and_probe_stack_clash): Support custom
probe ranges.
* target.def (stack_clash_protection_alloca_probe_range): New.
(stack_clash_protection_final_dynamic_probe): Remove.
* targhooks.h (default_stack_clash_protection_alloca_probe_range) New.
(default_stack_clash_protection_final_dynamic_probe): Remove.
* targhooks.c: Likewise.
* doc/tm.texi.in (TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE):
New.
(TARGET_STACK_CLASH_PROTECTION_FINAL_DYNAMIC_PROBE): Remove.
* doc/tm.texi: Regenerate.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/doc/tm.texi
trunk/gcc/doc/tm.texi.in
trunk/gcc/explow.c
trunk/gcc/target.def
trunk/gcc/targhooks.c
trunk/gcc/targhooks.h
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87476] [9 Regression] char-array initialized from wide-string
Date: Mon, 01 Oct 2018 12:58:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|needs-bisection |
CC| |law at gcc dot gnu.org
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Started to fail with r264042
* c-common.c (braced_list_to_string): Remove eval parameter.
Add some more checks. Always create zero-terminated STRING_CST.
* c-common.h (braced_list_to_string): Adjust prototype.
* c-decl.c (finish_decl): Call braced_list_to_string here ...
* c-parser.c (c_parser_declaration_or_fndef): ... instead of here.
* decl.c (eval_check_narrowing): Remove.
(check_initializer): Move call to braced_list_to_string from here
...
* typeck2.c (store_init_value): ... to here.
(digest_init_r): Remove handing of signed/unsigned char strings.
* c-c++-common/array-init.c: New test.
* g++.dg/init/string2.C: Remove xfail.
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From: "tnfchris at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86486] GCC 8 stack clash protection on AArch64 is incomplete
Date: Mon, 01 Oct 2018 13:01:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86486
--- Comment #4 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Author: tnfchris
Date: Mon Oct 1 13:00:58 2018
New Revision: 264751
URL: https://gcc.gnu.org/viewcvs?rev=264751&root=gcc&view=rev
Log:
Ensure that outgoing argument size is at least 8 bytes when alloca and
stack-clash.
This patch adds a requirement that the number of outgoing arguments for a
function is at least 8 bytes when using stack-clash protection and alloca.
By using this condition we can avoid a check in the alloca code and so have
smaller and simpler code there.
A simplified version of the AArch64 stack frames is:
+-----------------------+
| |
| |
| |
+-----------------------+
|LR |
+-----------------------+
|FP |
+-----------------------+
|dynamic allocations | ---- expanding area which will push the outgoing
+-----------------------+ args down during each allocation.
|padding |
+-----------------------+
|outgoing stack args | ---- safety buffer of 8 bytes (aligned)
+-----------------------+
By always defining an outgoing argument, alloca(0) effectively is safe to probe
at $sp due to the reserved buffer being there. It will never corrupt the
stack.
This is also safe for alloca(x) where x is 0 or x % page_size == 0. In the
former it is the same case as alloca(0) while the latter is safe because any
allocation pushes the outgoing stack args down:
|FP |
+-----------------------+
| |
|dynamic allocations | ---- alloca (x)
| |
+-----------------------+
|padding |
+-----------------------+
|outgoing stack args | ---- safety buffer of 8 bytes (aligned)
+-----------------------+
Which means when you probe for the residual, if it's 0 you'll again just probe
in the outgoing stack args range, which we know is non-zero (at least 8 bytes).
gcc/
PR target/86486
* config/aarch64/aarch64.h (STACK_CLASH_MIN_BYTES_OUTGOING_ARGS,
STACK_DYNAMIC_OFFSET): New.
* config/aarch64/aarch64.c (aarch64_layout_frame):
Update outgoing args size.
(aarch64_stack_clash_protection_alloca_probe_range,
TARGET_STACK_CLASH_PROTECTION_ALLOCA_PROBE_RANGE): New.
gcc/testsuite/
PR target/86486
* gcc.target/aarch64/stack-check-alloca-1.c: New.
* gcc.target/aarch64/stack-check-alloca-10.c: New.
* gcc.target/aarch64/stack-check-alloca-2.c: New.
* gcc.target/aarch64/stack-check-alloca-3.c: New.
* gcc.target/aarch64/stack-check-alloca-4.c: New.
* gcc.target/aarch64/stack-check-alloca-5.c: New.
* gcc.target/aarch64/stack-check-alloca-6.c: New.
* gcc.target/aarch64/stack-check-alloca-7.c: New.
* gcc.target/aarch64/stack-check-alloca-8.c: New.
* gcc.target/aarch64/stack-check-alloca-9.c: New.
* gcc.target/aarch64/stack-check-alloca.h: New.
* gcc.target/aarch64/stack-check-14.c: New.
* gcc.target/aarch64/stack-check-15.c: New.
Added:
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-14.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-15.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-alloca-1.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-alloca-10.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-alloca-2.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-alloca-3.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-alloca-4.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-alloca-5.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-alloca-6.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-alloca-7.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-alloca-8.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-alloca-9.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-alloca.h
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/aarch64/aarch64.c
trunk/gcc/config/aarch64/aarch64.h
trunk/gcc/testsuite/ChangeLog
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86486] GCC 8 stack clash protection on AArch64 is incomplete
Date: Mon, 01 Oct 2018 13:03:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86486
--- Comment #5 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Author: tnfchris
Date: Mon Oct 1 13:02:21 2018
New Revision: 264752
URL: https://gcc.gnu.org/viewcvs?rev=264752&root=gcc&view=rev
Log:
Allow setting of stack-clash via configure options.
This patch defines a configure option to allow the setting of the default
guard size via configure flags when building the target.
The new flag is:
* --with-stack-clash-protection-guard-size=<num>
The patch defines a new macro DEFAULT_STK_CLASH_GUARD_SIZE which targets need
to use explicitly is they want to support this configure flag and values that
users may have set.
gcc/
PR target/86486
* configure.ac: Add stack-clash-protection-guard-size.
* doc/install.texi: Document it.
* config.in (DEFAULT_STK_CLASH_GUARD_SIZE): New.
* params.def: Update comment for guard-size.
(PARAM_STACK_CLASH_PROTECTION_GUARD_SIZE,
PARAM_STACK_CLASH_PROTECTION_PROBE_INTERVAL): Update description.
* configure: Regenerate.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config.in
trunk/gcc/configure
trunk/gcc/configure.ac
trunk/gcc/doc/install.texi
trunk/gcc/params.def
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Subject: [Bug target/86486] GCC 8 stack clash protection on AArch64 is incomplete
Date: Mon, 01 Oct 2018 13:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86486
--- Comment #6 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Author: tnfchris
Date: Mon Oct 1 13:03:31 2018
New Revision: 264753
URL: https://gcc.gnu.org/viewcvs?rev=264753&root=gcc&view=rev
Log:
Set default values for stack-clash and do basic validation in back-end.
This patch enforces that the default guard size for stack-clash protection for
AArch64 be 64KB unless the user has overriden it via configure in which case
the user value is used as long as that value is within the valid range.
It also does some basic validation to ensure that the guard size is only 4KB or
64KB and also enforces that for aarch64 the stack-clash probing interval is
equal to the guard size.
gcc/
PR target/86486
* config/aarch64/aarch64.c (aarch64_override_options_internal):
Add validation for stack-clash parameters and set defaults.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/aarch64/aarch64.c
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/86486] GCC 8 stack clash protection on AArch64 is incomplete
Date: Mon, 01 Oct 2018 13:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86486
--- Comment #7 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Author: tnfchris
Date: Mon Oct 1 13:05:30 2018
New Revision: 264754
URL: https://gcc.gnu.org/viewcvs?rev=264754&root=gcc&view=rev
Log:
Cleanup the AArch64 testsuite when stack-clash is on.
This patch cleans up the testsuite when a run is done with stack clash
protection turned on.
Concretely this switches off -fstack-clash-protection for a couple of tests:
* assembler scan: some tests are quite fragile in that they check for exact
assembly output, e.g. check for exact amount of sub etc. These won't
match now.
* vla: Some of the ubsan tests negative array indices. Because the arrays
weren't
used before the incorrect $sp wouldn't have been used. The correct value
is
restored on ret. Now however we probe the $sp which causes a segfault.
* params: When testing the parameters we have to skip these on AArch64 because
of our
custom constraints on them. We already test them separately so this
isn't a
loss.
Note that the testsuite is not entire clean due to gdb failure caused by alloca
with
stack clash. On AArch64 we output an incorrect .loc directive, but this is
already the
case with the current implementation in GCC and is a bug unrelated to this
patch series.
gcc/testsuite/
PR target/86486
* gcc.dg/pr82788.c: Skip for AArch64.
* gcc.dg/guality/vla-1.c: Turn off stack-clash.
* gcc.target/aarch64/subsp.c: Likewise.
* gcc.dg/params/blocksort-part.c: Skip stack-clash checks
on AArch64.
* gcc.dg/stack-check-10.c: Add AArch64 specific checks.
* gcc.dg/stack-check-12.c: ILP32 fixup.
* gcc.dg/stack-check-5.c: Add AArch64 specific checks.
* gcc.dg/stack-check-6a.c: Skip on AArch64, we don't support this.
* testsuite/lib/target-supports.exp
(check_effective_target_frame_pointer_for_non_leaf): AArch64 does not
require frame pointer for non-leaf functions.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/c-c++-common/ubsan/vla-1.c
trunk/gcc/testsuite/gcc.dg/params/blocksort-part.c
trunk/gcc/testsuite/gcc.dg/pr82788.c
trunk/gcc/testsuite/gcc.dg/stack-check-10.c
trunk/gcc/testsuite/gcc.dg/stack-check-5.c
trunk/gcc/testsuite/gcc.dg/stack-check-6a.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-12.c
trunk/gcc/testsuite/gcc.target/aarch64/subsp.c
trunk/gcc/testsuite/lib/target-supports.exp
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Subject: [Bug c++/83372] ICE in GC within gt_ggc_mx<deferred_access_check> building Mir
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--- Comment #18 from Jonathan Wakely <redi at gcc dot gnu.org> ---
So is this fixed?
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Subject: [Bug tree-optimization/87465] [8 Regression] Loop removal regression
Date: Mon, 01 Oct 2018 13:11:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |9.0
Summary|[8/9 Regression] Loop |[8 Regression] Loop removal
|removal regression |regression
Known to fail| |8.2.0
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Fixed on trunk.
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Subject: [Bug tree-optimization/87465] [8 Regression] Loop removal regression
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87465
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> ---
Author: rguenth
Date: Mon Oct 1 13:10:48 2018
New Revision: 264758
URL: https://gcc.gnu.org/viewcvs?rev=264758&root=gcc&view=rev
Log:
2018-10-01 Richard Biener <rguenther@suse.de>
PR tree-optimization/87465
* tree-ssa-loop-ivcanon.c (tree_estimate_loop_size): Fix typo
causing branch miscounts.
* gcc.dg/tree-ssa/cunroll-15.c: New testcase.
Added:
trunk/gcc/testsuite/gcc.dg/tree-ssa/cunroll-15.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-ssa-loop-ivcanon.c
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Subject: [Bug c++/84191] [7/8/9 Regression] Compiler ICEs when trying to resolve impossible arithmetic operations
Date: Mon, 01 Oct 2018 13:13:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|needs-bisection |ice-on-valid-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-01
CC| |jason at gcc dot gnu.org
Summary|Compiler ICEs when trying |[7/8/9 Regression] Compiler
|to resolve impossible |ICEs when trying to resolve
|arithmetic operations |impossible arithmetic
| |operations
Ever confirmed|0 |1
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
At r254713 this started to ICE with:
/mnt/c/Users/cjdbn/projects/doge/doge/test/doge/gl/uniform.cpp: In lambda
function:
/mnt/c/Users/cjdbn/projects/doge/doge/test/doge/gl/uniform.cpp:249:52: error:
Local declaration from a different function
D.311875
/mnt/c/Users/cjdbn/projects/doge/doge/test/doge/gl/uniform.cpp:250:40: note: in
statement
_1 = &D.311875;
during GIMPLE pass: cfg
/mnt/c/Users/cjdbn/projects/doge/doge/test/doge/gl/uniform.cpp:249:52: internal
compiler error: verify_gimple failed
0x11f8dde verify_gimple_in_cfg(function*, bool)
../../gcc/tree-cfg.c:5392
0x1075f49 execute_function_todo
../../gcc/passes.c:1994
0x1074ef0 do_per_function
../../gcc/passes.c:1659
0x1076139 execute_todo
../../gcc/passes.c:2048
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
That commit was:
Capture adjustments for P0588R1.
* semantics.c (process_outer_var_ref): Capture variables when
they are named; complain about non-capture uses when odr-used.
* expr.c (mark_use): Rvalue use looks through capture proxy.
* constexpr.c (potential_constant_expression_1): Improve error
about
use of captured variable.
* lambda.c (need_generic_capture, dependent_capture_r)
(do_dependent_capture, processing_nonlambda_template): Remove.
* call.c (build_this): Remove uses of the above.
* decl.c (cp_finish_decl): Likewise.
* semantics.c (maybe_cleanup_point_expr)
(maybe_cleanup_point_expr_void, finish_goto_stmt)
(maybe_convert_cond): Likewise.
* typeck.c (check_return_expr): Likewise.
I haven't tried to reduce it.
With later trunk revisions it fails differently, so I haven't checked if it the
regression also affects the gcc-8-branch and current trunk.
In file included from /usr/lib/gcc/x86_64-linux-gnu/7/include/immintrin.h:45,
from /usr/local/include/glm/simd/platform.h:358,
from /usr/local/include/glm/detail/setup.hpp:36,
from /usr/local/include/glm/vec2.hpp:4,
from
/mnt/c/Users/cjdbn/projects/doge/doge/include/doge/hid.hpp:23,
from
/mnt/c/Users/cjdbn/projects/doge/doge/include/doge/engine.hpp:19,
from
/mnt/c/Users/cjdbn/projects/doge/doge/test/doge/gl/uniform.cpp:17:
/usr/lib/gcc/x86_64-linux-gnu/7/include/avx512fintrin.h: In function ‘__m128d
_mm_scalef_sd(__m128d, __m128d)’:
/usr/lib/gcc/x86_64-linux-gnu/7/include/avx512fintrin.h:11265:20: error:
‘__builtin_ia32_scalefsd_round’ was not declared in this scope
/usr/lib/gcc/x86_64-linux-gnu/7/include/avx512fintrin.h:11265:20: note:
suggested alternative: ‘__builtin_ia32_rndscalesd_round’
/usr/lib/gcc/x86_64-linux-gnu/7/include/avx512fintrin.h: In function ‘__m128
_mm_scalef_ss(__m128, __m128)’:
/usr/lib/gcc/x86_64-linux-gnu/7/include/avx512fintrin.h:11274:19: error:
‘__builtin_ia32_scalefss_round’ was not declared in this scope
/usr/lib/gcc/x86_64-linux-gnu/7/include/avx512fintrin.h:11274:19: note:
suggested alternative: ‘__builtin_ia32_rndscaless_round’
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Subject: [Bug c++/87469] [9 Regression] ice in record_estimate, at tree-ssa-loop-niter.c:3271
Date: Mon, 01 Oct 2018 13:17:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords|needs-bisection |
CC| |kugan at gcc dot gnu.org
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Started with r261682
PR middle-end/82479
* ipa-fnsummary.c (will_be_nonconstant_expr_predicate): Handle
CALL_EXPR.
* tree-scalar-evolution.c (interpret_expr): Likewise.
(expression_expensive_p): Likewise.
* tree-ssa-loop-ivopts.c (contains_abnormal_ssa_name_p): Likewise.
* tree-ssa-loop-niter.c (number_of_iterations_popcount): New.
(number_of_iterations_exit_assumptions): Use
number_of_iterations_popcount.
(ssa_defined_by_minus_one_stmt_p): New.
>From gcc-bugs-return-616674-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 13:25:10 2018
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Subject: [Bug rtl-optimization/87479] [9 Regression] FAIL: gcc.target/i386/pr63527.c
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-01
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Confirmed.
>From gcc-bugs-return-616675-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 13:28:15 2018
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Subject: [Bug target/86486] GCC 8 stack clash protection on AArch64 is incomplete
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--- Comment #8 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
Author: tnfchris
Date: Mon Oct 1 12:49:35 2018
New Revision: 264747
URL: https://gcc.gnu.org/viewcvs?rev=264747&root=gcc&view=rev
Log:
Updated stack-clash implementation supporting 64k probes.
This patch implements the use of the stack clash mitigation for aarch64.
In Aarch64 we expect both the probing interval and the guard size to be 64KB
and we enforce them to always be equal.
We also probe up by 1024 bytes in the general case when a probe is required.
AArch64 has the following probing conditions:
1a) Any initial adjustment less than 63KB requires no probing. An ABI defined
safe buffer of 1Kbytes is used and a page size of 64k is assumed.
b) Any final adjustment residual requires a probe at SP + 1KB.
We know this to be safe since you would have done at least one page worth
of allocations already to get to that point.
c) Any final adjustment more than remainder (total allocation amount) larger
than 1K - LR offset requires a probe at SP.
safe buffer mentioned in 1a is maintained by the storing of FP/LR.
In the case of -fomit-frame-pointer we can still count on LR being stored
if the function makes a call, even if it's a tail call. The AArch64 frame
layout code guarantees this and tests have been added to check against
this particular case.
2) Any allocations larger than 1 page size, is done in increments of page size
and probed up by 1KB leaving the residuals.
3a) Any residual for initial adjustment that is less than guard-size - 1KB
requires no probing. Essentially this is a sliding window. The probing
range determines the ABI safe buffer, and the amount to be probed up.
Incrementally allocating less than the probing thresholds, e.g. recursive
functions will
not be an issue as the storing of LR counts as a probe.
+-------------------+
| ABI SAFE REGION |
+------------------------------
| | |
| | |
| | |
| | |
| | |
| | |
maximum amount | | |
not needing a | | |
probe | | |
| | |
| | |
| | |
| | | Probe offset when
| ---------------------------- probe is required
| | |
+-------- +-------------------+ -------- Point of first
probe
| ABI SAFE REGION |
---------------------
| |
| |
| |
Bootstrapped Regtested on aarch64-none-linux-gnu and no issues.
Target was tested with stack clash on and off by default.
GLIBC testsuite also ran with stack clash on by default and no new
regressions.
gcc/
PR target/86486
* config/aarch64/aarch64.md
(probe_stack_range): Add k (SP) constraint.
* config/aarch64/aarch64.h (STACK_CLASH_CALLER_GUARD,
STACK_CLASH_MAX_UNROLL_PAGES): New.
* config/aarch64/aarch64.c (aarch64_output_probe_stack_range): Emit
stack probes for stack clash.
(aarch64_allocate_and_probe_stack_space): New.
(aarch64_expand_prologue): Use it.
(aarch64_expand_epilogue): Likewise and update IP regs re-use criteria.
(aarch64_sub_sp): Add emit_move_imm optional param.
gcc/testsuite/
PR target/86486
* gcc.target/aarch64/stack-check-12.c: New.
* gcc.target/aarch64/stack-check-13.c: New.
* gcc.target/aarch64/stack-check-cfa-1.c: New.
* gcc.target/aarch64/stack-check-cfa-2.c: New.
* gcc.target/aarch64/stack-check-prologue-1.c: New.
* gcc.target/aarch64/stack-check-prologue-10.c: New.
* gcc.target/aarch64/stack-check-prologue-11.c: New.
* gcc.target/aarch64/stack-check-prologue-12.c: New.
* gcc.target/aarch64/stack-check-prologue-13.c: New.
* gcc.target/aarch64/stack-check-prologue-14.c: New.
* gcc.target/aarch64/stack-check-prologue-15.c: New.
* gcc.target/aarch64/stack-check-prologue-2.c: New.
* gcc.target/aarch64/stack-check-prologue-3.c: New.
* gcc.target/aarch64/stack-check-prologue-4.c: New.
* gcc.target/aarch64/stack-check-prologue-5.c: New.
* gcc.target/aarch64/stack-check-prologue-6.c: New.
* gcc.target/aarch64/stack-check-prologue-7.c: New.
* gcc.target/aarch64/stack-check-prologue-8.c: New.
* gcc.target/aarch64/stack-check-prologue-9.c: New.
* gcc.target/aarch64/stack-check-prologue.h: New.
* lib/target-supports.exp
(check_effective_target_supports_stack_clash_protection): Add AArch64.
Added:
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-12.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-13.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-cfa-1.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-cfa-2.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-1.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-10.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-11.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-12.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-13.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-14.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-15.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-2.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-3.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-4.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-5.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-6.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-7.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-8.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-prologue-9.c
trunk/gcc/testsuite/gcc.target/aarch64/stack-check-prologue.h
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/lib/target-supports.exp
trunk/gcc/gcc/config/aarch64/aarch64.md
trunk/gcc/gcc/config/aarch64/aarch64.h
trunk/gcc/gcc/config/aarch64/aarch64.c
trunk/gcc/ChangeLog
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Subject: [Bug c++/87478] Hidden member function falsely takes part in qualified name lookup
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug c++/87478] Hidden member function falsely takes part in qualified name lookup
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Confirmed, not a regression. Reduced:
template<typename> struct is_int { };
template<> struct is_int<int> { using type = void; };
class MyTag {};
template<typename> struct is_tag { };
template<> struct is_tag<MyTag> { using type = void; };
struct Base
{
template <typename RType>
typename is_int<RType>::type create(RType)
{
}
};
struct Derived : Base
{
using Base::create;
template <typename Tag>
typename is_tag<Tag>::type create(Tag)
{
}
};
int main()
{
Derived d;
d.create(MyTag());
d.create(0);
}
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Subject: [Bug c++/70792] Incorrect sequence point warning with uniform initializer syntax
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--- Comment #7 from Matthijs van Duin <matthijsvanduin at gmail dot com> ---
Ah! I should have checked the actual tests of 51253 before calling it a
regression, apologies. I just kinda assumed that these simple cases would be
covered by the work done back then.
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acsawdey at gcc dot gnu.org changed:
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----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |acsawdey at gcc dot gnu.org
--- Comment #3 from acsawdey at gcc dot gnu.org ---
This looks like I screwed up the conditions, clearly it shouldn't be trying to
generate the vector/vsx strncmp expansion with -mno-power8-vector.
>From gcc-bugs-return-616680-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 13:36:08 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87473] [7/8/9 Regression] ICE in create_add_on_incoming_edge, at gimple-ssa-strength-reduction.c:2344
Date: Mon, 01 Oct 2018 13:36:00 -0000
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Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Mine, will investigate this week.
>From gcc-bugs-return-616681-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 13:43:56 2018
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Subject: [Bug target/87474] ICE in extract_insn, at recog.c:2305
Date: Mon, 01 Oct 2018 13:43:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|powerpc |powerpc*-*-*
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87366] [6/7/8/9 Regression] SFINAE trait as template parameter causes incorrect application of trait to other areas
Date: Mon, 01 Oct 2018 13:54:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-01
CC| |jason at gcc dot gnu.org
Known to work| |4.9.4
Summary|SFINAE trait as template |[6/7/8/9 Regression] SFINAE
|parameter causes incorrect |trait as template parameter
|application of trait to |causes incorrect
|other areas |application of trait to
| |other areas
Ever confirmed|0 |1
Known to fail| |5.5.0, 6.4.0, 7.3.0, 8.2.0,
| |9.0
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced:
struct A {};
struct B {};
template <typename T> struct wrapper {};
template <typename> struct enable_if_A { };
template<> struct enable_if_A<A> { using type = void; };
template <typename T, typename = typename enable_if_A<T>::type> using ok_t = T;
template <typename T> void not_even_called(wrapper<const ok_t<T>&> a);
template <typename T> int called(wrapper<const T&> a);
void test(wrapper<const B&>& val)
{
called(val);
}
87366.cc: In function 'void test(wrapper<const B&>&)':
87366.cc:17:15: error: no matching function for call to 'called(wrapper<const
B&>&)'
17 | called(val);
| ^
87366.cc:13:27: note: candidate: 'template<class T> int
called(wrapper<ok_t<T>&>)'
13 | template <typename T> int called(wrapper<const T&> a);
| ^~~~~~
87366.cc:13:27: note: template argument deduction/substitution failed:
87366.cc: In substitution of 'template<class T> int called(wrapper<ok_t<T>&>)
[with T = B]':
87366.cc:17:15: required from here
87366.cc:13:27: error: no type named 'type' in 'struct enable_if_A<B>'
This was accepted prior to gcc-5, it started to be rejected with r217250:
DR 1558
* pt.c (dependent_alias_template_spec_p): New.
(dependent_type_p_r): Handle dependent alias template
specialization.
(template_args_equal): A dependent alias template specializations
is not equal to its underlying type as a template argument.
* tree.c (strip_typedefs): Don't strip a dependent alias
template-id.
>From gcc-bugs-return-616682-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 13:54:10 2018
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Subject: [Bug rtl-optimization/87479] [9 Regression] FAIL: gcc.target/i386/pr63527.c
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Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |bergner at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |bergner at gcc dot gnu.org
--- Comment #2 from Peter Bergner <bergner at gcc dot gnu.org> ---
Mine.
>From gcc-bugs-return-616684-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 13:58:27 2018
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From: "fiesh at zefix dot tv" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87480] New: SFINAE constructor not matched, only in templated function
Date: Mon, 01 Oct 2018 13:58:00 -0000
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Bug ID: 87480
Summary: SFINAE constructor not matched, only in templated
function
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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The following code compiles with gcc <= 7.3 and clang. It also compiles with
gcc >= 8 when FIX is defined. It does not compile with gcc >=8 without FIX
though.
struct e {
template <typename f, typename = decltype(((f*)0)->d)> e(f);
};
struct A {
double d;
};
#ifndef FIX
template <typename>
#endif
void j() {
A k{};
(void) static_cast<e>(k);
}
>From gcc-bugs-return-616685-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 14:06:20 2018
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Subject: [Bug c++/87480] [8/9 Regression] SFINAE constructor not matched, only in templated function
Date: Mon, 01 Oct 2018 14:06:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Known to work| |7.3.0
Keywords| |rejects-valid
Last reconfirmed| |2018-10-01
CC| |jason at gcc dot gnu.org
Ever confirmed|0 |1
Summary|SFINAE constructor not |[8/9 Regression] SFINAE
|matched, only in templated |constructor not matched,
|function |only in templated function
Known to fail| |8.2.0, 9.0
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Confirmed. Started to be rejected with r258039
PR c++/84489 - dependent default template argument
* pt.c (type_unification_real): Handle early substitution failure.
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Subject: [Bug c++/87481] New: Endless loop with optimisation in C++17
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Bug ID: 87481
Summary: Endless loop with optimisation in C++17
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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Created attachment 44773
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44773&action=edit
minimal example
Compile the attached code with 'std=c++17 -O1'.
This will generate the message "minimal.cc:9:45: error: ‘millliseconds’ is not
a member of ‘std::chrono’" and then leave the compiler an endless,
memory-eating loop. I can reproduce the bug with any version of g++ that
supports C++17 and any optimisation level greater than zero.
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Subject: [Bug c++/87480] [8/9 Regression] SFINAE constructor not matched, only in templated function
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87480
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |8.3
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Slightly further reduced (it happens for any function template, not just
constructors):
template<typename T> T&& declval();
template <typename T, typename = decltype(declval<T>().d)> void f(T) { }
struct A {
double d;
};
#ifndef FIX
template <typename>
#endif
void j(A& a) {
f(a);
}
>From gcc-bugs-return-616688-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 14:18:17 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87481] Endless loop with optimisation in C++17
Date: Mon, 01 Oct 2018 14:18:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |compile-time-hog
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-01
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Reduced:
struct thread {
template<typename F> thread(F) { }
};
template<typename D>
void sleep_for(D) { }
template<typename T> struct duration { };
using milliseconds = duration<int>;
void f()
{
thread sleeper([]{
while (true) {
for (unsigned cc = 0; cc < 10000; ++cc) ;
sleep_for(millliseconds(50));
}
});
}
>From gcc-bugs-return-616689-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 14:26:12 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87481] [7/8/9 Regression] Endless loop with optimisation in C++17
Date: Mon, 01 Oct 2018 14:26:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87481
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-invalid-code,
| |memory-hog
CC| |jason at gcc dot gnu.org
Known to work| |6.4.0
Summary|Endless loop with |[7/8/9 Regression] Endless
|optimisation in C++17 |loop with optimisation in
| |C++17
Known to fail| |7.3.0, 8.2.0, 9.0
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Further reduced:
void f()
{
[]{
while (true) {
for (unsigned cc = 0; cc < 10000; ++cc) ;
millliseconds m;
}
};
}
Regression started with r239268:
Implement C++17 constexpr lambda.
gcc/c-family/
* c-cppbuiltin.c (c_cpp_builtins): Update __cpp_constexpr for
C++17 constexpr lambdas.
gcc/cp/
* class.c (finalize_literal_type_property): Handle lambdas.
* constexpr.c (is_valid_constexpr_fn): Likewise. No longer static.
(explain_invalid_constexpr_fn, cxx_eval_call_expression): Handle
lambdas.
(cxx_eval_constant_expression): Handle capture proxy.
(var_in_constexpr_fn): Don't check for C++14.
(var_in_maybe_constexpr_fn): New.
(potential_constant_expression_1): Use it. Check DECL_EXPR for
declarations not allowed in constexpr function.
* decl.c (make_rtl_for_nonlocal_decl): Use
var_in_maybe_constexpr_fn.
(finish_function): Set DECL_DECLARED_CONSTEXPR_P on lambda members.
* lambda.c (begin_lambda_type): Set CLASSTYPE_LITERAL_P.
(maybe_add_lambda_conv_op): Clear thunk CALL_EXPR location.
(lambda_static_thunk_p): New.
* parser.c (cp_keyword_starts_decl_specifier_p): Add RID_CONSTEXPR.
(CP_PARSER_FLAGS_ONLY_MUTABLE_OR_CONSTEXPR): New enumerator.
(cp_parser_decl_specifier_seq): Handle it.
(cp_parser_lambda_declarator_opt): Use
cp_parser_decl_specifier_seq.
* pt.c (instantiate_class_template_1): Set CLASSTYPE_LITERAL_P.
(tsubst_copy_and_build) [CALL_EXPR]: Propagate CALL_FROM_THUNK_P.
* error.c (dump_function_decl): Check TFF_NO_TEMPLATE_BINDINGS.
(dump_expr) [FUNCTION_DECL]: Pass it.
I'm going to call this ice-on-invalid even though it doesn't actually ICE, it
just loops until killed.
>From gcc-bugs-return-616690-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 14:27:55 2018
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Subject: [Bug fortran/65677] Incomplete assignment on deferred-length character variable
Date: Mon, 01 Oct 2018 14:27:00 -0000
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--- Comment #6 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Mon Oct 1 14:27:17 2018
New Revision: 264759
URL: https://gcc.gnu.org/viewcvs?rev=264759&root=gcc&view=rev
Log:
2018-10-01 Paul Thomas <pault@gcc.gnu.org>
PR fortran/65677
* trans-expr.c (gfc_trans_assignment_1): Set the 'identical'
flag in the call to gfc_check_dependency.
2018-10-01 Paul Thomas <pault@gcc.gnu.org>
PR fortran/65677
* gfortran.dg/dependency_52.f90 : Expand the test to check both
the call to adjustl and direct assignment of the substring.
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/dependency.c
trunk/gcc/fortran/trans-expr.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gfortran.dg/dependency_52.f90
>From gcc-bugs-return-616691-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 14:43:59 2018
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Subject: [Bug tree-optimization/87473] [7/8/9 Regression] ICE in create_add_on_incoming_edge, at gimple-ssa-strength-reduction.c:2344
Date: Mon, 01 Oct 2018 14:43:00 -0000
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--- Comment #3 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
Reproduces on trunk for powerpc64le-linux-gnu also.
>From gcc-bugs-return-616692-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 15:17:39 2018
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From: "peter.smith at linaro dot org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/87482] New: Clarify behaviour of resolvers with parameters in for __attribute__((ifunc))
Date: Mon, 01 Oct 2018 15:17:00 -0000
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Bug ID: 87482
Summary: Clarify behaviour of resolvers with parameters in for
__attribute__((ifunc))
Product: gcc
Version: 8.0
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In the documentation for
https://gcc.gnu.org/onlinedocs/gcc-8.2.0/gcc/Common-Function-Attributes.html#Common-Function-Attributes
it says: "The resolver should be declared to be a function taking no arguments
and returning a pointer to a function of the same type as the implementation."
I would like to check if the documentation is correct here as the
implementation accepts a parameter and on some architectures, such as Arm and
AArch64, the hwcaps is passed in to the resolver as a parameter by the dynamic
loader? To me it looks like the documentation isn't quite right, but I could be
missing something important.
For example a quick modification of the example on the page:
#include <stdlib.h>
void *my_memcpy (void *dst, const void *src, size_t len)
{
return dst;
}
void *my_memcpy2 (void *dst, const void *src, size_t len)
{
return dst;
}
static void * (*resolve_memcpy (int hwcap))(void *, const void *, size_t)
{
if (hwcap == 1)
return my_memcpy;
else
return my_memcpy2;
}
void *memcpy(void *, const void*, size_t) __attribute__((ifunc
("resolve_memcpy")));
Compiles without a problem.
From what I can see glibc doesn't use __attribute__((ifunc("resolver")))
instead it uses __asm__ (".type " resolver, %gnu_indirect_function).
For context clang will give an error message if the ifunc resolver has a
parameter.
ifunc2.c:20:58: error: ifunc resolver function must have no parameters
void *memcpy(void *, const void*, size_t) __attribute__((ifunc ("resolve...
There is a thread on cfe-dev asking if the GCC documentation is correct and to
see if clang should be following the documentation or the implementation:
http://lists.llvm.org/pipermail/cfe-dev/2018-September/059548.html
There was a recent change for 8.0 that made "The resolver should be declared to
be a function taking no arguments" more explicit.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81882
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/69431] There should be builtins for PowerPC mtfsb0, mtfsb1
Date: Mon, 01 Oct 2018 15:57:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69431
--- Comment #2 from Carl Love <carll at gcc dot gnu.org> ---
Author: carll
Date: Mon Oct 1 15:57:13 2018
New Revision: 264764
URL: https://gcc.gnu.org/viewcvs?rev=264764&root=gcc&view=rev
Log:
Update, forgot to put the PR number in the Change Log.
gcc/ChangeLog:
2018-10-01 Carl Love <cel@us.ibm.com>
PR 69431
* config/rs6000/rs6000-builtin.def (__builtin_mffsl): New.
(__builtin_mtfsb0): New.
(__builtin_mtfsb1): New.
( __builtin_set_fpscr_rn): New.
(__builtin_set_fpscr_drn): New.
* config/rs6000/rs6000.c (rs6000_expand_mtfsb_builtin): Add.
(rs6000_expand_set_fpscr_rn_builtin): Add.
(rs6000_expand_set_fpscr_drn_builtin): Add.
(rs6000_expand_builtin): Add case statement entries for
RS6000_BUILTIN_MTFSB0, RS6000_BUILTIN_MTFSB1,
RS6000_BUILTIN_SET_FPSCR_RN, RS6000_BUILTIN_SET_FPSCR_DRN,
RS6000_BUILTIN_MFFSL.
(rs6000_init_builtins): Add ftype initialization and def_builtin
calls for __builtin_mffsl, __builtin_mtfsb0, __builtin_mtfsb1,
__builtin_set_fpscr_rn, __builtin_set_fpscr_drn.
* config/rs6000.md (rs6000_mtfsb0, rs6000_mtfsb1, rs6000_mffscrn,
rs6000_mffscdrn): Add define_insn.
(rs6000_set_fpscr_rn, rs6000_set_fpscr_drn): Add define_expand.
* doc/extend.texi: Add documentation for the builtins.
gcc/testsuite/ChangeLog:
2018-10-01 Carl Love <cel@us.ibm.com>
PR 69431
* gcc.target/powerpc/test_mffsl-p9.c: New file.
* gcc.target/powerpc/test_fpscr_rn_builtin.c: New file.
* gcc.target/powerpc/test_fpscr_drn_builtin.c: New file.
* gcc.target/powerpc/test_fpscr_rn_builtin_error.c: New file.
* gcc.target/powerpc/test_fpscr_drn_builtin_error.c: New file.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug target/69431] There should be builtins for PowerPC mtfsb0, mtfsb1
Date: Mon, 01 Oct 2018 16:05:00 -0000
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Carl Love <carll at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |carll at gcc dot gnu.org
--- Comment #3 from Carl Love <carll at gcc dot gnu.org> ---
Note, the actual commit was r264762. Commit r264764 added the PR number to
the commit logs.
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Subject: [Bug target/69431] There should be builtins for PowerPC mtfsb0, mtfsb1
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Carl Love <carll at gcc dot gnu.org> changed:
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--- Comment #4 from Carl Love <carll at gcc dot gnu.org> ---
Patch committed. Closing the bugzilla
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Carl Love <carll at gcc dot gnu.org> changed:
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--- Comment #5 from Carl Love <carll at gcc dot gnu.org> ---
Closing
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Subject: [Bug target/69431] There should be builtins for PowerPC mtfsb0, mtfsb1
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From: "joseph at codesourcery dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/87482] Clarify behaviour of resolvers with parameters in for __attribute__((ifunc))
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--- Comment #1 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
Yes, on some platforms the resolver takes the HWCAP as an argument and so
should be declared as a function taking that argument (if it uses it,
anyway).
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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/56789] Wrong code with contiguous dummy argument
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--- Comment #7 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Ah, I see where the problem is.
Consider the test case
module zero
implicit none
contains
subroutine foo(a)
real, contiguous :: a(:,:)
print *,a
end subroutine foo
subroutine bar(a)
real :: a(:,:)
print *,a
end subroutine bar
end module zero
program main
use zero
implicit none
real, dimension(5,5) :: a
data a /1.,2.,3.,4.,5.,6.,7.,8.,9.,10.,11.,12.,13.,14.,15.,16.,17., &
& 18.,19.,20.,21.,22.,23.,24.,25./
call bar(a(1:5:2,1:5:2))
call foo(a(1:5:2,1:5:2))
end program main
This gets translated to, for the call to bar,
{
struct array02_real(kind=4) parm.16;
parm.16.span = 4;
parm.16.dtype = {.elem_len=4, .rank=2, .type=3};
parm.16.dim[0].lbound = 0;
parm.16.dim[0].ubound = 2;
parm.16.dim[0].stride = 2;
parm.16.dim[1].lbound = 0;
parm.16.dim[1].ubound = 2;
parm.16.dim[1].stride = 10;
parm.16.data = (void *) &a[0];
parm.16.offset = 0;
bar (&parm.16);
}
and for the call to foo
{
struct array02_real(kind=4) parm.17;
void * origptr.18;
void * D.3863;
parm.17.span = 4;
parm.17.dtype = {.elem_len=4, .rank=2, .type=3};
parm.17.dim[0].lbound = 0;
parm.17.dim[0].ubound = 2;
parm.17.dim[0].stride = 2;
parm.17.dim[1].lbound = 0;
parm.17.dim[1].ubound = 2;
parm.17.dim[1].stride = 10;
parm.17.data = (void *) &a[0];
parm.17.offset = 0;
origptr.18 = parm.17.data;
D.3863 = _gfortran_internal_pack (&parm.17);
parm.17.data = D.3863;
foo (&parm.17);
parm.17.data = origptr.18;
if ((real(kind=4)[0:] *) parm.17.data != (real(kind=4)[0:] *) D.3863)
{
_gfortran_internal_unpack (&parm.17, D.3863);
__builtin_free (D.3863);
}
}
The problem is that the data gets packed, but we pass the constructor to the
original, unpacked data to bar.
We should build a new one.
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Subject: [Bug c/85948] printf format attribute warning line carat inaccurate
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--- Comment #2 from Jonny Grant <jg at jguk dot org> ---
Great work Manuel
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Subject: [Bug c/87483] New: attribute alias accepted on a symbol definition
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Bug ID: 87483
Summary: attribute alias accepted on a symbol definition
Product: gcc
Version: 9.0
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GCC silently accepts attribute alias on the definition of a symbol in
contradiction to the attribute's purpose.
int f (void) { return 0; }
__attribute__ ((alias ("f"))) int g () { return 1; }
int h (void)
{
return g ();
}
Other compilers that support the attribute (e.g., Clang and ICC) reject the
definition with the attribute with an error:
t.c:3:35: error: redefinition of 'g'
__attribute__ ((alias ("f"))) int g () { return 1; }
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Subject: [Bug jit/64196] No automated test coverage for debugging of JIT-generated code
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to David Malcolm from comment #0)
> gcc/jit/docs/intro/tutorial04.rst shows an example of debugging,
> single-stepping through JIT-generated code in gdb [1].
>
> This was all tested by hand. We don't yet have any automated test coverage
> to verify that this works.
>
> [1]: built HTML version of this currently here:
> https://dmalcolm.fedorapeople.org/gcc/libgccjit-api-docs/intro/tutorial04.
> html#single-stepping-through-the-generated-code
Are you still working on this?
>From gcc-bugs-return-616704-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 18:02:51 2018
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From: "janus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/56386] [F03] ICE with ASSOCIATE construct and an derived type array component
Date: Mon, 01 Oct 2018 18:02:00 -0000
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--- Comment #7 from janus at gcc dot gnu.org ---
(In reply to Tobias Burnus from comment #2)
> Related test case by the bug reporterm
> https://groups.google.com/forum/?fromgroups=#!topic/comp.lang.fortran/
> UvBX1kfuFqs
>
>
> This time rejecting the code instead of ICEing:
>
> print *,x%i
> 1
> Error: Symbol 'x' at (1) has no IMPLICIT type
One can get past this error via:
diff --git a/gcc/fortran/primary.c b/gcc/fortran/primary.c
index 6f45afa86ea..311e3aafc85 100644
--- a/gcc/fortran/primary.c
+++ b/gcc/fortran/primary.c
@@ -2111,7 +2111,7 @@ gfc_match_varspec (gfc_expr *primary, int equiv_flag,
bool sub_flag,
sym->ts = tgt_expr->ts;
}
- if (sym->ts.type == BT_UNKNOWN)
+ if (sym->ts.type == BT_UNKNOWN && !sym->assoc)
{
gfc_error ("Symbol %qs at %C has no IMPLICIT type", sym->name);
return MATCH_ERROR;
but then one runs into:
7 | print *,x%i
| 1
Error: Syntax error in PRINT statement at (1)
> program p
> type t
> integer :: i = 0
> end type
>
> associate (x=>f())
> print *,x%i
> end associate
>
> contains
> function f()
> type(t) f
> f%i = 5
> end function
> end program
The general problem with this case is that we can not infer the type of 'x'
before parsing the print statement. Right now I can not see how to get around
this issue.
>From gcc-bugs-return-616705-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 18:04:29 2018
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Subject: [Bug go/52357] 64bit-out.go and go.test/test/cmplxdivide.go time out on Solaris/SPARC
Date: Mon, 01 Oct 2018 18:04:00 -0000
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--- Comment #5 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Ian Lance Taylor from comment #3)
> The 64bit-out.go case appears to be similar. It is also a generated file,
> and it also takes a long time to compile. The register allocator is not
> quite as dominant, only 43% of compilation time. In any case I will revisit
> 64bit-out when and if cmplxdivide is fixed.
Has cmplxdivide been fixed yet?
>From gcc-bugs-return-616706-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 18:05:56 2018
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Subject: [Bug libstdc++/63776] [C++11] Regex collate matching not working
Date: Mon, 01 Oct 2018 18:05:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #10 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Tim Shen from comment #9)
> Ping.
Who exactly was this ping directed towards?
>From gcc-bugs-return-616707-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 18:10:51 2018
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Subject: [Bug libstdc++/54005] Use __atomic_always_lock_free in libstdc++ is_lock_free instead of __atomic_is_lock_free
Date: Mon, 01 Oct 2018 18:10:00 -0000
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--- Comment #17 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Hans-Peter Nilsson from comment #16)
> (In reply to Jonathan Wakely from comment #14)
> > Can we close this?
>
> No. IIUC, we're still/again using __atomic_is_lock_free with alignment
> deduced from the current object rather than the type (even though it's now a
> proxy-object; the faked pointer is constructed from the alignment of the
> current object).
>
> So, r221701 was wrong to change from null to the alignment-deduced
> fake-pointer.
So, if we can't close, does it make sense to still leave it in WAITING? WAITING
implies a threat to close if what's being waited upon isn't produced.
>From gcc-bugs-return-616708-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 18:12:41 2018
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Subject: [Bug target/38629] target-specific parameters for inline heuristics not defined for AVR
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #9 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Jan Hubicka from comment #6)
> OK, at -Os the issue is that function is called once so inlining is a win.
> Making multiple copies of it leads to GCC making clone:
> delay_wait_us_ms.constprop.0:
> .LFB3:
> movl $136, %edi
> jmp delay_wait_us
> .LFE3:
> and then calling it
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> call delay_wait_us_ms.constprop.0
> at -Os,that is
>
> With -O2 it is different story, we end up inlining everything. We get:
> Analyzing function body size: delay_wait_us
> freq: 1000 size: 1 time: 1 __asm__ __volatile__("wdr");
> freq: 1000 size: 1 time: 1 MEM[(volatile unsigned char *)82B] ={v}
> timeout_2(D);
> freq: 1000 size: 1 time: 1 D.2719_5 ={v} MEM[(volatile unsigned char
> *)88B];
> freq: 1000 size: 1 time: 1 D.2720_6 = D.2719_5 | 1;
> freq: 1000 size: 1 time: 1 MEM[(volatile unsigned char *)88B] ={v}
> D.2720_6;
> freq: 11111 size: 1 time: 1 D.2721_8 ={v} MEM[(volatile unsigned char
> *)88B];
> freq: 11111 size: 0 time: 0 D.2722_9 = (int) D.2721_8;
> freq: 11111 size: 1 time: 1 D.2723_10 = D.2722_9 & 1;
> freq: 11111 size: 2 time: 2 if (D.2723_10 == 0)
> freq: 1000 size: 1 time: 2 return;
> Likely eliminated
> Overall function body time: 51-2 size: 10-1
> With function call overhead time: 51-13 size: 10-3
>
> that fits in early-inlining-insns. With --param early-inlining-insns=0 we
> get it right. GCC inliner is guessing here that inlining such a small leaf
> function will result in enough optimization so it pays back. I am not sure
> what we can do here, early-inlining-insns is being pushed up by C++ code...
>
> It is not terribly bad tradeoff even at -O2. I will try to get some data how
> much early inlining insns cost us at -O2 and if it is too much, I will
> disable the allowed growth for functions not declared inline.
Are you still working on this?
>From gcc-bugs-return-616709-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 18:14:05 2018
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Subject: [Bug rtl-optimization/26190] combine misses some distributivity
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--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Jim Wilson from comment #3)
> This ior/shift/xor optimization be done during combine with a simplify-rtx.c
> patch. I wrote a prototype and tested it. Combine canonicalizes
> shift/logical as logical/shift, so we actually have to look for
> ior/xor/shift. I see that the optimization does not happen on arm and
> aarch64 because the 0x4002 value does not fit into the immediate range for
> logical ops, gets loaded into a register, pulled out of the loop, and hence
> is not available to combine. We would have to perform the optimization
> earlier for it to work for arm/aarch64. I tried MIPS, and see that because
> MIPS promotes HImode to SImode we don't have enough info to prove that the
> opt is safe. We need type info to make this work. This prototype does work
> for the x86 target which has both 16-bit immediates and HImode instructions.
>
> Next I wrote a prototype for match-and-simplify. This one works for all 4
> targets. We have to handle ior/shift/xor as match-and-simplify does not
> canonicalize logical/shift. I noticed that if I change the xor to an ior,
> then it gets optimized in combine because of the canonicalization for mips
> and x86, but not for arm/aarch64 again because the constant was pulled out
> of the loop. So it seems that match-and-simplify should canonicalize
> shift/logical to logical/shift too. That would also reduce the number of
> patterns we need to match when performing this ior/shift/xor optimization.
>
> These are prototype patches that need a bit more work to handle more cases,
> and to prove that they test all conditions necessary to make them safe.
> This is my first attempt to use the wi:: functions, so there might be a
> better way to do this.
Have you made further attempts since?
>From gcc-bugs-return-616710-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 18:16:18 2018
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Subject: [Bug c++/56868] Constexpr example in 7.1.5/5 fails to compile correctly
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Status|NEW |ASSIGNED
CC| |egallager at gcc dot gnu.org
--- Comment #8 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Kai Tietz from comment #7)
> This issue gets fixed with delayed-folding. Therefore assign it to me.
Since it's assigned to you, changing status to ASSIGNED, too
>From gcc-bugs-return-616711-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 18:18:57 2018
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Subject: [Bug jit/66074] gcc_jit_result_get_code returns a void*
Date: Mon, 01 Oct 2018 18:18:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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CC| |egallager at gcc dot gnu.org
--- Comment #1 from Eric Gallager <egallager at gcc dot gnu.org> ---
I'm surprised this hasn't caused any issues with -Wcast-function-type yet
>From gcc-bugs-return-616712-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 18:19:49 2018
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From: "okannen at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87478] Hidden member function falsely takes part in qualified name lookup
Date: Mon, 01 Oct 2018 18:19:00 -0000
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Olivier Kannengieser <okannen at gmail dot com> changed:
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CC| |okannen at gmail dot com
--- Comment #2 from Olivier Kannengieser <okannen at gmail dot com> ---
Is this realy a bug or an other instance of core issue 1980:
http://www.open-std.org/jtc1/sc22/wg21/docs/cwg_active.html#1980.
I think the behavior of Gcc is the one expected by the standardization
commitee.
>From gcc-bugs-return-616713-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 18:20:02 2018
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Subject: [Bug target/64525] Duplicate instructions in both paths in conditional code
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Maxim Kuvyrkov from comment #2)
> Kugan's work-in-progress patches may fix this one.
Are they still work-in-progress?
>From gcc-bugs-return-616714-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 19:01:07 2018
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Subject: [Bug fortran/56789] Wrong code with contiguous dummy argument
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
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CC| |pault at gcc dot gnu.org
--- Comment #8 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Paul, I'm adding you to the CC in the hope that the analysis
in comment#7 might help you towards a solution that is
glaringly obvious to you (but not to me :-)
>From gcc-bugs-return-616715-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 19:03:10 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/87483] attribute alias accepted on a symbol definition
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Martin Liška <marxin at gcc dot gnu.org> changed:
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Assignee|unassigned at gcc dot gnu.org |marxin at gcc dot gnu.org
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
I can fix that.
>From gcc-bugs-return-616716-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 19:26:52 2018
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Subject: [Bug rtl-optimization/26190] combine misses some distributivity
Date: Mon, 01 Oct 2018 19:26:00 -0000
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--- Comment #5 from Jim Wilson <wilson at gcc dot gnu.org> ---
I haven't done any further work on this.
>From gcc-bugs-return-616717-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 19:29:28 2018
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From: "zwilcox at sandia dot gov" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug debug/87484] New: internal compiler error: in dwf_regno, at dwarf2cfi.c:909
Date: Mon, 01 Oct 2018 19:29:00 -0000
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Bug ID: 87484
Summary: internal compiler error: in dwf_regno, at
dwarf2cfi.c:909
Product: gcc
Version: 4.9.0
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Created attachment 44774
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44774&action=edit
Files that produce errors
Host: Win10
Target: PowerPC
Flags: -O0 -g3 -Wall -mspe=yes -mabi=spe -mfloat-gprs=double -c -mbig-endian
-fno-builtin -fomit-frame-pointer -Wno-unknown-pragmas -mcpu=8548 -MMD -MP -MF
Command line that triggered bug: powerpc-eabi-gcc -O0 -g3 -Wall -mspe=yes
-mabi=spe -mfloat-gprs=double -c -mbig-endian -fno-builtin -fomit-frame-pointer
-Wno-unknown-pragmas -mcpu=8548 -MMD -MP -MF"src/CompilerError.d"
-MT"src/CompilerError.o" -o "src/CompilerError.o" "../src/CompilerError.c"
Compiler output:
In function 'foo':
../src/CompilerError.c:13:20: warning: unused variable 'lower'
[-Wunused-variable]
volatile uint64_t lower = *(ADDR1);
^
../src/CompilerError.c:16:1: internal compiler error: in dwf_regno, at
dwarf2cfi.c:909
Attached is a tar file.
The tar file contains three versions of the code; one that produces the error,
and two that do not, and the preprocessed file
>From gcc-bugs-return-616718-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 19:49:58 2018
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From: "janus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/82943] [F03] Error with type-bound procedure of parametrized derived type
Date: Mon, 01 Oct 2018 19:49:00 -0000
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janus at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |rejects-valid
CC| |janus at gcc dot gnu.org
Summary|Error derived type-bound |[F03] Error with type-bound
|procedure PASS(this) |procedure of parametrized
| |derived type
--- Comment #4 from janus at gcc dot gnu.org ---
Reduced test case for the error:
module testmod
public :: foo
type, public :: t(n)
integer, len :: n = 1
contains
procedure :: foo
end type
contains
subroutine foo(this)
class(t(*)), intent(inout) :: this
end subroutine
end module
procedure :: foo
1
Error: Argument ‘this’ of ‘foo’ with PASS(this) at (1) must be of the
derived-type ‘t’
>From gcc-bugs-return-616719-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 19:57:41 2018
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Subject: [Bug fortran/82943] [F03] Error with type-bound procedure of parametrized derived type
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--- Comment #5 from janus at gcc dot gnu.org ---
One can get around the error with a patch like this:
diff --git a/gcc/fortran/resolve.c b/gcc/fortran/resolve.c
index a2beb7fc90a..6b6e34c0d86 100644
--- a/gcc/fortran/resolve.c
+++ b/gcc/fortran/resolve.c
@@ -13433,8 +13433,9 @@ resolve_typebound_procedure (gfc_symtree* stree)
goto error;
}
- if (CLASS_DATA (me_arg)->ts.u.derived
- != resolve_bindings_derived)
+ if ((CLASS_DATA (me_arg)->ts.u.derived != resolve_bindings_derived) &&
+ !(resolve_bindings_derived->attr.pdt_template
+ && gfc_str_startswith (CLASS_DATA (me_arg)->ts.u.derived->name,
"Pdt")))
{
gfc_error ("Argument %qs of %qs with PASS(%s) at %L must be of"
" the derived-type %qs", me_arg->name, proc->name,
It is sufficient to accept the code in comment #4, but otherwise not fully
complete. With this patch, the code in comment #0 is still rejected:
29 | call b%foo()
| 1
Error: ‘foo’ at (1) is not a member of the ‘pdttypedef’ structure
>From gcc-bugs-return-616720-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 20:08:43 2018
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Subject: [Bug fortran/82943] [F03] Error with type-bound procedure of parametrized derived type
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--- Comment #6 from janus at gcc dot gnu.org ---
Actually the patch is better expressed as:
diff --git a/gcc/fortran/resolve.c b/gcc/fortran/resolve.c
index a2beb7fc90a..4710b7d2975 100644
--- a/gcc/fortran/resolve.c
+++ b/gcc/fortran/resolve.c
@@ -13433,8 +13433,9 @@ resolve_typebound_procedure (gfc_symtree* stree)
goto error;
}
- if (CLASS_DATA (me_arg)->ts.u.derived
- != resolve_bindings_derived)
+ if ((CLASS_DATA (me_arg)->ts.u.derived != resolve_bindings_derived) &&
+ !(resolve_bindings_derived->attr.pdt_template
+ && CLASS_DATA (me_arg)->ts.u.derived->attr.pdt_type))
{
gfc_error ("Argument %qs of %qs with PASS(%s) at %L must be of"
" the derived-type %qs", me_arg->name, proc->name,
But one still needs to make sure that the PDT template and the PDT type
actually belong to each other and enforce another condition: "All length type
parameters of the passed object dummy argument must be assumed." (as ifort puts
it)
>From gcc-bugs-return-616721-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 21:01:14 2018
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Subject: [Bug c/81824] Warn for missing attributes with function aliases
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
Assignee|unassigned at gcc dot gnu.org |msebor at gcc dot gnu.org
--- Comment #9 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2018-10/msg00047.html
>From gcc-bugs-return-616722-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 21:11:39 2018
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Subject: [Bug c/87482] Clarify behaviour of resolvers with parameters in for __attribute__((ifunc))
Date: Mon, 01 Oct 2018 21:11:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-01
CC| |msebor at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Besides updating the manual it might be helpful to detect resolver declarations
that are inconsistent with the expected signature and issue a warning.
Joseph, is the resolver signature fixed for each hardware target or can it vary
even for the same target?
>From gcc-bugs-return-616723-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 22:24:59 2018
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Subject: [Bug rtl-optimization/26190] combine misses some distributivity
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--- Comment #6 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Jim Wilson from comment #5)
> I haven't done any further work on this.
The reason I was asking was because this bug shows up in my search of bugs with
an assignee but that aren't marked as ASSIGNED. So, should I change the status
to ASSIGNED here, or leave it as NEW and remove you as the assignee?
>From gcc-bugs-return-616724-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 22:51:41 2018
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Subject: [Bug c/87482] Clarify behaviour of resolvers with parameters in for __attribute__((ifunc))
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--- Comment #3 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
I expect it's valid to use (void) if that particular IFUNC resolver
doesn't use the HWCAP information passed, even if the HWCAP information is
passed to resolvers on that architecture. And I wouldn't assume resolvers
are necessarily consistent about which integer type of a given size is
used - the AArch64 glibc dynamic linker uses uint64_t, for example, but a
user could well use (unsigned) long int or (unsigned) long long int rather
than exactly matching what the dynamic linker uses. (Using a narrower
integer type if you only care about low bits of the HWCAP is riskier,
depending on what the ABI says about high bits of the register passing
such a narrower integer argument.)
>From gcc-bugs-return-616725-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Oct 01 22:56:36 2018
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Subject: [Bug fortran/56789] Wrong code with contiguous dummy argument
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--- Comment #9 from Paul Thomas <pault at gcc dot gnu.org> ---
(In reply to Thomas Koenig from comment #8)
> Paul, I'm adding you to the CC in the hope that the analysis
> in comment#7 might help you towards a solution that is
> glaringly obvious to you (but not to me :-)
Coo! A Golden Oldie - I can hear Elvis in the background...
I'll take a look.
Tschuess
Paul
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Subject: [Bug rtl-optimization/26190] combine misses some distributivity
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--- Comment #7 from Jim Wilson <wilson at gcc dot gnu.org> ---
I didn't realize it was assigned to me. I changed it to unassigned.
>From gcc-bugs-return-616727-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 02:12:53 2018
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Subject: [Bug c++/70125] attributes diagnostics missing essential context
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--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
I see you've been working on attribute diagnostics again lately; any progress
on this one?
>From gcc-bugs-return-616728-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 02:19:17 2018
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Subject: [Bug c++/71138] [concepts] ill-formed non-constant expression use in nested requirement produces duplicated diagnostics with poor source locations
Date: Tue, 02 Oct 2018 02:19:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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CC| |paolo.carlini at oracle dot com
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing Paolo Carlini, who seems to be the main person working on Concepts stuff
>From gcc-bugs-return-616729-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 02:20:40 2018
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Subject: [Bug c++/81178] [concepts] poor (partial?) diagnostic for alias substitution failure in a concept body
Date: Tue, 02 Oct 2018 02:20:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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CC| |paolo.carlini at oracle dot com
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing closest thing we have to a "concepts" maintainer
>From gcc-bugs-return-616730-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 02:22:22 2018
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Subject: [Bug c++/80144] Concept introduced with "template<OtherConcept T>" is not diagnosed
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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CC| |paolo.carlini at oracle dot com
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing de facto "concepts" maintainer
>From gcc-bugs-return-616731-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 02:27:03 2018
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From: "egallager at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/77370] missing -Wignored-qualiifiers on a bogus const reference
Date: Tue, 02 Oct 2018 02:27:00 -0000
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--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #1)
> (In reply to Martin Sebor from comment #0)
> > GCC rejects the program below because it tries to initialize the non-const
> > reference object cr with a temporary, but it doesn't diagnose the
> > declaration of the reference type CR where it disregards the const
> > qualifier. In contrast, Clang diagnoses both. GCC could be improved by
> > doing the same.
> >
> > $ (set -x && cat z.C && /build/gcc-trunk-svn/gcc/xgcc -B
> > /build/gcc-trunk-svn/gcc -Wall -Wextra -Wpedantic z.C;
> > /build/llvm-trunk/bin/clang -S -Wall z.C)
> > + cat z.C
> > typedef char& R;
> > typedef const R CR;
> >
> > char c;
> > R r = c;
> > CR cr = 'b';
> > + /build/gcc-trunk-svn/gcc/xgcc -B /build/gcc-trunk-svn/gcc -Wall -Wextra
> > -Wpedantic z.C
> > z.C:6:9: error: cannot bind non-const lvalue reference of type ‘CR {aka
> > char&}’ to an rvalue of type ‘char’
> > CR cr = 'b';
> > ^~~
> > + /build/llvm-trunk/bin/clang -S -Wall z.C
> > z.C:2:9: warning: 'const' qualifier on reference type 'R' (aka 'char &') has
> > no
> > effect [-Wignored-qualifiers]
> > typedef const R CR;
> > ^~~~~~
> > z.C:6:4: error: non-const lvalue reference to type 'char' cannot bind to a
> > temporary of type 'char'
> > CR cr = 'b';
> > ^ ~~~
> > 1 warning and 1 error generated.
>
> My version of clang only prints the one error, but then again my version of
> clang is old (because my computer is old). Confirmed anyways that it'd still
> be a nice additional warning to have.
>
> $ /usr/local/bin/g++ -c -Wall -Wextra -pedantic 77370.cc
> 77370.cc:6:9: error: cannot bind non-const lvalue reference of type ‘CR {aka
> char&}’ to an rvalue of type ‘char’
> CR cr = 'b';
> ^~~
> $ /sw/opt/llvm-3.1/bin/clang++ -c -S -Wall -Wextra -pedantic 77370.cc
> 77370.cc:6:4: error: non-const lvalue reference to type 'char' cannot bind
> to a temporary of type 'char'
> CR cr = 'b';
> ^ ~~~
> 1 error generated.
> $
Update: On a newer computer with a newer version of clang I can confirm that I
get the additional warning from -Wignored-qualifiers too:
$ clang++ -c -S -Wall -Wextra -pedantic 77370.cc
77370.cc:2:9: warning: 'const' qualifier on reference type 'R' (aka 'char &')
has no effect [-Wignored-qualifiers]
typedef const R CR;
^~~~~~
77370.cc:6:4: error: non-const lvalue reference to type 'char' cannot bind to a
temporary of type 'char'
CR cr = 'b';
^ ~~~
1 warning and 1 error generated.
$
>From gcc-bugs-return-616732-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 02:28:40 2018
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Subject: [Bug c++/77502] -Wzero-as-null-pointer-constant : misleading/imprecise messages
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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CC| |dmalcolm at gcc dot gnu.org,
| |dodji at gcc dot gnu.org
--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing diagnostics maintainers
>From gcc-bugs-return-616733-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 02:32:58 2018
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Subject: [Bug tree-optimization/56572] GCC generates non-optimal transactional code when inlining nested transaction.
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
URL| |http://gcc.gnu.org/ml/gcc-p
| |atches/2013-12/msg01693.htm
| |l
Assignee|aldyh at gcc dot gnu.org |unassigned at gcc dot gnu.org
--- Comment #11 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #10)
> (In reply to Aldy Hernandez from comment #9)
> > Created attachment 31787 [details]
> > removal of transactions from clones
> >
> > This is a patch that fixes part of the problem, but as discussed in the
> > thread, is not sufficient since the uninstrumented code path will still end
> > up containing a nested transaction after inlining.
> >
> > I am attaching this patch for further reference when this PR is picked up
> > again. See thread for more details.
>
> Are you still working on it?
No reply; taking that as a "no"
>From gcc-bugs-return-616734-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 02:35:09 2018
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Subject: [Bug other/85716] No easy way for end-user to tell what GCC is doing when compilation is slow
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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Status|NEW |ASSIGNED
--- Comment #7 from Eric Gallager <egallager at gcc dot gnu.org> ---
Changing status to ASSIGNED since there's a recent-enough assignee
>From gcc-bugs-return-616735-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 02:37:35 2018
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |sandra at codesourcery dot com
--- Comment #8 from Eric Gallager <egallager at gcc dot gnu.org> ---
Changing status to ASSIGNED since there's a recent-enough assignee
(In reply to Eric Gallager from comment #7)
> Changing status to ASSIGNED since there's a recent-enough assignee
Also cc-ing Sandra since she wrote this:
(In reply to Eric Gallager from comment #6)
>
> Right, I found the thread (I think) I was thinking of:
> https://gcc.gnu.org/ml/gcc-patches/2017-10/msg00957.html
>From gcc-bugs-return-616736-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 08:28:44 2018
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Subject: [Bug c++/87481] [7/8/9 Regression] Endless loop with optimisation in C++17
Date: Tue, 02 Oct 2018 08:28:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Priority|P3 |P2
Target Milestone|--- |7.4
>From gcc-bugs-return-616737-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 08:33:47 2018
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Subject: [Bug debug/87484] internal compiler error: in dwf_regno, at dwarf2cfi.c:909
Date: Tue, 02 Oct 2018 08:33:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|PowerPC |powerpcspe
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-10-02
Ever confirmed|0 |1
--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
Note that GCC 4.9 is no longer supported, please try GCC 6.4 or newer. Note
that GCC 4.9._0_ is particularly old and the 4.9 branch has seen a 4.9.4
release.
>From gcc-bugs-return-616738-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 08:43:59 2018
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Subject: [Bug gcov-profile/87442] Add options to filter files we want to instrument for code coverage
Date: Tue, 02 Oct 2018 08:43:00 -0000
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--- Comment #5 from calixte <cdenizet at mozilla dot com> ---
@martin, @honza: about option names, do we have an agreement on
-fprofile-filter-files and -fprofile-exclude-files ?
>From gcc-bugs-return-616739-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 09:05:34 2018
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Subject: [Bug c++/56868] Constexpr example in 7.1.5/5 fails to compile correctly
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
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--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This was fixed for GCC 6 by r230364 "Merge C++ delayed folding branch"
>From gcc-bugs-return-616740-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 09:16:23 2018
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Subject: [Bug libstdc++/54005] Use __atomic_always_lock_free in libstdc++ is_lock_free instead of __atomic_is_lock_free
Date: Tue, 02 Oct 2018 09:16:00 -0000
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--- Comment #18 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Hans-Peter Nilsson from comment #16)
> (In reply to Jonathan Wakely from comment #14)
> > Can we close this?
>
> No. IIUC, we're still/again using __atomic_is_lock_free with alignment
> deduced from the current object rather than the type (even though it's now a
> proxy-object; the faked pointer is constructed from the alignment of the
> current object).
It's constructed from __alignof(_M_i) and since r221945 that is given a fixed
alignment:
static constexpr int _S_alignment =
sizeof(_ITp) > alignof(_ITp) ? sizeof(_ITp) : alignof(_ITp);
alignas(_S_alignment) __int_type _M_i;
So it will be the same for all objects of the type.
There was an additional fix in r227878 for Bug 65913.
> So, r221701 was wrong to change from null to the alignment-deduced
> fake-pointer.
I think the current code is right, and per-type.
I still want to close this.
>From gcc-bugs-return-616741-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 09:17:16 2018
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Subject: [Bug ada/85380] gnatbind fails with small executable & restricted runtime
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--- Comment #2 from simon at pushface dot org ---
This is fixed in GCC 9.0.0.
>From gcc-bugs-return-616742-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 09:37:17 2018
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Subject: [Bug ada/85380] gnatbind fails with small executable & restricted runtime
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Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
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--- Comment #3 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
Thanks for the note.
>From gcc-bugs-return-616743-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 10:15:59 2018
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/71138] [concepts] ill-formed non-constant expression use in nested requirement produces duplicated diagnostics with poor source locations
Date: Tue, 02 Oct 2018 10:15:00 -0000
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--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Thanks Eric, I'll see what I can do. By the way, while we go through all these
bugs having to do with concepts one way or another, let's make sure they all
block the meta-bug 67491.
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Subject: [Bug target/87149] ICE in extract_insn, at recog.c:2305 on ppc64le
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #11 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Assuming fixed.
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Subject: [Bug target/87149] ICE in extract_insn, at recog.c:2305 on ppc64le
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--- Comment #12 from Martin Liška <marxin at gcc dot gnu.org> ---
Yes, thanks for the fix.
>From gcc-bugs-return-616746-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 11:10:11 2018
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Subject: [Bug rtl-optimization/87485] New: [9 Regression] Compile time hog w/ -O2 -fschedule-insns -fno-guess-branch-probability -fno-isolate-erroneous-paths-dereference -fno-omit-frame-pointer -fno-split-wide-types -fno-tree-ccp -fno-tree-sra
Date: Tue, 02 Oct 2018 11:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87485
Bug ID: 87485
Summary: [9 Regression] Compile time hog w/ -O2
-fschedule-insns -fno-guess-branch-probability
-fno-isolate-erroneous-paths-dereference
-fno-omit-frame-pointer -fno-split-wide-types
-fno-tree-ccp -fno-tree-sra
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: compile-time-hog
Severity: normal
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: asolokha at gmx dot com
Target Milestone: ---
Target: x86_64-pc-linux-gnu
gcc-9.0.0-alpha20180930 snapshot (r264727) takes indefinite time when compiling
the following snippet w/ -O2 -fschedule-insns -fno-guess-branch-probability
-fno-isolate-erroneous-paths-dereference -fno-omit-frame-pointer
-fno-split-wide-types -fno-tree-ccp -fno-tree-sra:
int *xh;
int
c8 (__int128 n8, int dx, int b7)
{
__int128 fl;
*xh = ((!!dx ? dx : n8) * dx | n8) * 2;
if (b7 == 0)
{
unsigned int e4 = 1;
__int128 *lj = &fl;
for (*xh = 0; *xh < 1; *xh += dx)
{
}
*xh += fl < (e4 / 0);
goto f0;
c7:
while (fl < 1)
{
}
++*xh;
}
goto c7;
f0:
return 0;
}
Previously weekly snapshot of the trunk has been ICEing on the same snippet w/
"internal compiler error: Maximum number of LRA assignment passes is achieved
(30)". I believe it stopped ICEing after r264726.
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Subject: [Bug rtl-optimization/87485] [9 Regression] Compile time hog w/ -O2 -fschedule-insns -fno-guess-branch-probability -fno-isolate-erroneous-paths-dereference -fno-omit-frame-pointer -fno-split-wide-types -fno-tree-ccp -fno-tree-sra
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--- Comment #1 from Arseny Solokha <asolokha at gmx dot com> ---
Some hot entries from the tip of "perf top" output:
Overhead Shared Objec Symbol
23.31% cc1 [.] find_hard_regno_for_1
18.20% cc1 [.] assign_by_spills
14.17% cc1 [.] process_bb_lives
8.35% cc1 [.] bitmap_set_bit
8.01% cc1 [.] reload_pseudo_compare_func
4.04% cc1 [.] lra_get_insn_regs
3.40% cc1 [.] lra_create_live_ranges_1
3.03% cc1 [.] mark_pseudo_live
2.34% cc1 [.] lra_assign
1.71% cc1 [.] bitmap_clear_bit
1.35% cc1 [.] update_reg_eliminate
1.27% cc1 [.] update_lives
1.07% cc1 [.] qsort_chk
0.85% cc1 [.] lra_clear_live_ranges
0.85% cc1 [.] mark_regno_live
0.84% cc1 [.] mark_pseudo_dead
0.78% cc1 [.] insert_in_live_range_start_chain
0.71% cc1 [.] lra_split_hard_reg_for
0.71% cc1 [.] sparseset_clear_bit
0.50% cc1 [.] find_hard_regno_for
0.48% cc1 [.] sparseset_and_compl
0.43% cc1 [.] lra_free_copies
0.36% cc1 [.] get_equiv
0.28% cc1 [.] may_trap_p_1
>From gcc-bugs-return-616748-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 11:19:56 2018
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Subject: [Bug rtl-optimization/87485] [9 Regression] Compile time hog w/ -O2 -fschedule-insns -fno-guess-branch-probability -fno-isolate-erroneous-paths-dereference -fno-omit-frame-pointer -fno-split-wide-types -fno-tree-ccp -fno-tree-sra
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Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ra
Target Milestone|--- |9.0
>From gcc-bugs-return-616749-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 11:39:00 2018
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Subject: [Bug testsuite/87081] [9 regression] gcc.target/powerpc/vec-init-6.c failures with r262930
Date: Tue, 02 Oct 2018 11:39:00 -0000
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-10-02
Assignee|unassigned at gcc dot gnu.org |segher at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Confirmed. I'll take it.
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Subject: [Bug target/87021] New powerpc test cases from r263570 fail
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> ---
These are all fixed now as far as I see.
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Subject: [Bug target/82699] ENDBR isn't generated at function entrance (with -mfentry)
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--- Comment #10 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Tue Oct 2 12:12:18 2018
New Revision: 264782
URL: https://gcc.gnu.org/viewcvs?rev=264782&root=gcc&view=rev
Log:
i386: Insert ENDBR before the profiling counter call
ENDBR must be the first instruction of a function. This patch queues
ENDBR if we need to put the profiling counter call before the prologue
and generate ENDBR before the profiling counter call.
i386: Compile pr82699-5.c and pr82699-6.c with -fno-pic
Compile pr82699-5.c and pr82699-6.c with -fno-pic to avoid
FAIL: gcc.target/i386/pr82699-5.c (test for excess errors)
Excess errors:
cc1: sorry, unimplemented: -mfentry isn't supported for 32-bit in combination
with -fpic
FAIL: gcc.target/i386/pr82699-6.c (test for excess errors)
Excess errors:
cc1: error: -mnop-mcount is not implemented for -fPIC
cc1: sorry, unimplemented: -mfentry isn't supported for 32-bit in combination
with -fpic
when running GCC testsuite with --target_board='unix{-fpic\ -m32,-fpic}'.
gcc/
Backport from mainline
PR target/82699
* config/i386/i386.c (rest_of_insert_endbranch): Set
endbr_queued_at_entrance to true and don't insert ENDBR if
x86_function_profiler will be called.
(x86_function_profiler): Insert ENDBR if endbr_queued_at_entrance
is true.
* config/i386/i386.h (machine_function): Add
endbr_queued_at_entrance.
gcc/testsuite/
Backport from mainline
PR target/82699
* gcc.target/i386/pr82699-5.c: Add -fno-pic for ia32.
* gcc.target/i386/pr82699-6.c: Add -fno-pic.
PR target/82699
* gcc.target/i386/pr82699-1.c: New file.
* gcc.target/i386/pr82699-2.c: Likewise.
* gcc.target/i386/pr82699-3.c: Likewise.
* gcc.target/i386/pr82699-4.c: Likewise.
* gcc.target/i386/pr82699-5.c: Likewise.
* gcc.target/i386/pr82699-6.c: Likewise.
Added:
branches/gcc-8-branch/gcc/testsuite/gcc.target/i386/pr82699-1.c
branches/gcc-8-branch/gcc/testsuite/gcc.target/i386/pr82699-2.c
branches/gcc-8-branch/gcc/testsuite/gcc.target/i386/pr82699-3.c
branches/gcc-8-branch/gcc/testsuite/gcc.target/i386/pr82699-4.c
branches/gcc-8-branch/gcc/testsuite/gcc.target/i386/pr82699-5.c
branches/gcc-8-branch/gcc/testsuite/gcc.target/i386/pr82699-6.c
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/config/i386/i386.c
branches/gcc-8-branch/gcc/config/i386/i386.h
branches/gcc-8-branch/gcc/testsuite/ChangeLog
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H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |FIXED
--- Comment #11 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for GCC 9 and GCC 8.3.
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Subject: [Bug target/81652] [meta-bug] -fcf-protection=full bugs
Date: Tue, 02 Oct 2018 12:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81652
Bug 81652 depends on bug 82699, which changed state.
Bug 82699 Summary: ENDBR isn't generated at function entrance (with -mfentry)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82699
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>From gcc-bugs-return-616754-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 12:32:37 2018
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Subject: [Bug sanitizer/82616] ../bfd/.libs/libbfd.a(plugin.o): undefined reference to symbol 'dlsym@@GLIBC_2.16'
Date: Tue, 02 Oct 2018 12:32:00 -0000
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H.J. Lu <hjl.tools at gmail dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed by
https://gcc.gnu.org/ml/gcc-cvs/2018-04/msg00150.html
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From: "paul.richard.thomas at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/56789] Wrong code with contiguous dummy argument
Date: Tue, 02 Oct 2018 13:50:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56789
--- Comment #10 from paul.richard.thomas at gmail dot com <paul.richard.thomas at gmail dot com> ---
Hi Thomas,
The centre of gravity for this problem is trans-array.c:7905. This is
triggering the packing of the array, which will indeed make the data
contiguous. However, the bounds and strides are not being reset
accordingly and passed to 'foo'.
To accomplish this, a new descriptor must be made and the packed data
pointed to by it's data field.
As a matter of curiosity, is a deferred shape array allowed to be
contiguous if it is not allocatable? According to IBM: The entity that
is specified with the CONTIGUOUS attribute must be an array pointer,
an assumed-shape array, or an assumed-rank object.
Even if that were allowed, the standard explicitly disallows the
argument association in the testcase: See 5.3.7 of the F2008 standard.
Regards
Paul
On Mon, 1 Oct 2018 at 20:01, tkoenig at gcc dot gnu.org
<gcc-bugzilla@gcc.gnu.org> wrote:
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56789
>
> Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
>
> What |Removed |Added
> ----------------------------------------------------------------------------
> CC| |pault at gcc dot gnu.org
>
> --- Comment #8 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
> Paul, I'm adding you to the CC in the hope that the analysis
> in comment#7 might help you towards a solution that is
> glaringly obvious to you (but not to me :-)
>
> --
> You are receiving this mail because:
> You are on the CC list for the bug.
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Subject: [Bug target/87133] ICE in aggregate_value_p with -frounding-math on ppc64le
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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--- Comment #12 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug testsuite/87081] [9 regression] gcc.target/powerpc/vec-init-6.c failures with r262930
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--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Tue Oct 2 14:19:49 2018
New Revision: 264789
URL: https://gcc.gnu.org/viewcvs?rev=264789&root=gcc&view=rev
Log:
rs6000: Fix vec-init-6.c (PR87081)
Since a while we use a rldimi instead of rldicl/rldicr/or to combine
two words to one.
PR target/87081
* gcc.target/powerpc/vec-init-6.c: Fix expected asm.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/powerpc/vec-init-6.c
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From: "quicknir at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/78113] std::variant and std::visit's current implementations do not get optimized out (compared to "recursive visitation")
Date: Tue, 02 Oct 2018 14:42:00 -0000
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--- Comment #4 from Nir Friedman <quicknir at gmail dot com> ---
Started a PR on mpark github variant: https://github.com/mpark/variant/pull/52.
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From: "zwilcox at sandia dot gov" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug debug/87484] internal compiler error: in dwf_regno, at dwarf2cfi.c:909
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Zachary Wilcox <zwilcox at sandia dot gov> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Zachary Wilcox <zwilcox at sandia dot gov> ---
Thank you.
I've moved to 5.4 and the problem has gone away.
Thanks again.
Zach
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Subject: [Bug middle-end/87319] When vector is wrapped, expression is not optimized.
Date: Tue, 02 Oct 2018 14:56:00 -0000
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--- Comment #4 from Marc Glisse <glisse at gcc dot gnu.org> ---
Author: glisse
Date: Tue Oct 2 14:55:39 2018
New Revision: 264790
URL: https://gcc.gnu.org/viewcvs?rev=264790&root=gcc&view=rev
Log:
No a*x+b*x factorization for signed vectors
2018-10-02 Marc Glisse <marc.glisse@inria.fr>
PR middle-end/87319
* fold-const.c (fold_plusminus_mult_expr): Handle complex and vectors.
* tree.c (signed_or_unsigned_type_for): Handle complex.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/fold-const.c
trunk/gcc/tree.c
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Subject: [Bug libstdc++/87258] vector<bool> useless offset
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--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
Author: glisse
Date: Tue Oct 2 14:59:25 2018
New Revision: 264791
URL: https://gcc.gnu.org/viewcvs?rev=264791&root=gcc&view=rev
Log:
vector<bool> _M_start and 0 offset
2018-10-02 Marc Glisse <marc.glisse@inria.fr>
PR libstdc++/87258
* include/bits/stl_bvector.h (vector::begin(), vector::cbegin()):
Rebuild _M_start with an explicit 0 offset.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/include/bits/stl_bvector.h
>From gcc-bugs-return-616763-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 15:20:37 2018
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Subject: [Bug testsuite/87486] New: [9 regression] gcc.target/powerpc/undef-bool-2.c fails starting with r264335
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Bug ID: 87486
Summary: [9 regression] gcc.target/powerpc/undef-bool-2.c fails
starting with r264335
Product: gcc
Version: 9.0
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This revision causes a slight change in the error message produced by this test
case which causes it to fail when tested.
Before:
/home/seurer/gcc/gcc-test/gcc/testsuite/gcc.target/powerpc/undef-bool-2.c:12:1:
error: unknown type name 'bool'; did you mean '_Bool'?
12 | bool foo (int x) /* { dg-error "unknown type name 'bool'; did you mean
'_Bool'?" } */
| ^~~~
| _Bool
After:
/home/seurer/gcc/gcc-test2/gcc/testsuite/gcc.target/powerpc/undef-bool-2.c:12:1:
error: unknown type name 'bool'
12 | bool foo (int x) /* { dg-error "unknown type name 'bool'; did you mean
'_Bool'?" } */
| ^~~~
>From the revision's text it appears this is intentional, right? If so I will
update the test case to match the new message.
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Subject: [Bug rtl-optimization/87479] [9 Regression] FAIL: gcc.target/i386/pr63527.c
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Peter Bergner <bergner at gcc dot gnu.org> changed:
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| |patches/2018-10/msg00101.ht
| |ml
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Subject: [Bug middle-end/87319] When vector is wrapped, expression is not optimized.
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Marc Glisse <glisse at gcc dot gnu.org> changed:
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Keywords|wrong-code |
--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> ---
Sorry, I've probably made things worse from your perspective, but gcc was
internally doing something unsafe. Now we can work on implementing this
factorization properly.
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Subject: [Bug c++/58407] [C++11] Should warn about deprecated implicit generation of copy constructor/assignment
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Allan Jensen <linux at carewolf dot com> changed:
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--- Comment #24 from Allan Jensen <linux at carewolf dot com> ---
So with this the rule-of-three is now the rule-of-four or six?
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Subject: [Bug c++/58407] [C++11] Should warn about deprecated implicit generation of copy constructor/assignment
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--- Comment #25 from Andrzej Krzemienski <akrzemi1 at gmail dot com> ---
(In reply to Allan Jensen from comment #24)
> So with this the rule-of-three is now the rule-of-four or six?
The Rule of Zero: https://blog.rmf.io/cxx11/rule-of-zero
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Subject: [Bug testsuite/87486] [9 regression] gcc.target/powerpc/undef-bool-2.c fails starting with r264335
Date: Tue, 02 Oct 2018 16:08:00 -0000
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--- Comment #1 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
For "bool" vs "_Bool", the edit distance is 2.
After r264335:
(gdb) p get_edit_distance_cutoff (4, 5)
$1 = 1
Hence "_Bool" is rejected as a suggestion, as it's above the threshold.
The cutoff is 1 rather than 2 due to the rounding rules in
get_edit_distance_cutoff. In theory these could be tweaked for the 4 vs 5
case, but I'd prefer not to.
(or we could tweak things so that lowercase <-> uppercase changes cost less
than other changes, and switch to fixed-point distances, or whatnot).
I'd suggest removing the suggestion from the dg-error.
>From gcc-bugs-return-616768-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 16:18:53 2018
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Subject: [Bug c++/85948] poor location info for arguments and format strings (printf format warning)
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Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|WAITING |NEW
CC| |dmalcolm at gcc dot gnu.org
Component|c |c++
Summary|printf format attribute |poor location info for
|warning line carat |arguments and format
|inaccurate |strings (printf format
| |warning)
--- Comment #3 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Most of the credit goes to David, who re-implemented a better approach for
locations within strings and then implemented locations for arguments.
Let's update the description to match the actual issue
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Subject: [Bug testsuite/87487] New: New test case gfortran.dg/deferred_character_24.f90 in r264721 fails on big endian
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Bug ID: 87487
Summary: New test case gfortran.dg/deferred_character_24.f90 in
r264721 fails on big endian
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When run on a powerpc64 big endian machine this test case produces:
seurer@makalu-lp1:~/gcc/build/gcc-test2$ ./deferred_character_24.exe
STOP 1
Which in the test case appears to be from here:
if (LEN (number_string) .ne. 16) stop 1
I don't know enough fortran to know if this is working as expected or not.
Note that this works fine on powerpc64 little endian.
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Subject: [Bug c++/58407] [C++11] Should warn about deprecated implicit generation of copy constructor/assignment
Date: Tue, 02 Oct 2018 16:28:00 -0000
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--- Comment #26 from Steinar H. Gunderson <steinar+gcc at gunderson dot no> ---
That blog post seems to advocate using std::unique_ptr for pretty much
everything, which unfortunately doesn't always work. See e.g. slide 8 of
https://github.com/CppCon/CppCon2018/blob/master/Presentations/woes_of_scope_guards_and_unique_resource/woes_of_scope_guards_and_unique_resource__peter_sommerlad__cppcon_2018.pdf
-- C++20 will have std::unique_resource, but we're not there yet.
Straying off course for the bug, though...
>From gcc-bugs-return-616771-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 16:32:28 2018
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Subject: [Bug c/87488] New: hyperlink filenames in diagnostics
Date: Tue, 02 Oct 2018 16:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87488
Bug ID: 87488
Summary: hyperlink filenames in diagnostics
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
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Modern terminals are starting to implement the interpretation of hyperlinks
encoded in escape sequences
(https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda). The idea
is to produce a escape sequence similar to the one generated for colors that
encodes a hyperlink that, in the simplest case, describes the path to a file.
Support for hyperlinks has been added to ls:
https://github.com/coreutils/coreutils/commit/799bac0d06cfabe9491498727308df8d1aca6d98
and to systemd:
https://github.com/systemd/systemd/commit/23b27b39d2a3a002ad827a2e8a9872a51495d797
It would be interesting if GCC hyperlinked filenames in GCC diagnostics such
that given:
myfile.c:1:2: error: some error
it is possible to click in myfile.c and automatically open
"file://path/to/myfile.c"
I suggest -fdiagnostics-hyperlink=[always|never|auto] with a default of never
for now until support becomes more widespread.
>From gcc-bugs-return-616772-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 16:33:03 2018
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Subject: [Bug c/87488] hyperlink filenames in diagnostics
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Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
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CC| |dmalcolm at gcc dot gnu.org
--- Comment #1 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
David may be interested in this.
>From gcc-bugs-return-616773-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 16:36:21 2018
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Subject: [Bug c/87488] hyperlink filenames in diagnostics
Date: Tue, 02 Oct 2018 16:36:00 -0000
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--- Comment #2 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Actually, according to
https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda#detecting-availability-of-the-feature
"almost all terminal emulators ignore the OSC sequences they don't know about,
so emitting OSC 8 will result in the anchor text not becoming a hyperlink, and
the target URI getting lost."
That is, the default could be "auto" since terminals that do not recognize the
sequence will simply discard it.
>From gcc-bugs-return-616774-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 16:46:08 2018
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Subject: [Bug rtl-optimization/87466] IRA and LRA spill all pseudos that are live across setjmp calls
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Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
URL|https://gcc.gnu.org/ml/gcc- |https://gcc.gnu.org/ml/gcc-
|patches/2018-09/msg01759.ht |patches/2018-10/msg00134.ht
|ml |ml
Last reconfirmed| |2018-10-02
Ever confirmed|0 |1
--- Comment #2 from Peter Bergner <bergner at gcc dot gnu.org> ---
Updated patch submitted.
>From gcc-bugs-return-616775-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 16:52:15 2018
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Subject: [Bug c/87488] hyperlink filenames in diagnostics
Date: Tue, 02 Oct 2018 16:52:00 -0000
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
https://gist.github.com/egmontkob/eb114294efbcd5adb1944c9f3cb5feda#file-uris-and-the-hostname
says there should be a hostname part, so not just file:///path but
file://hostname/path
If I compile on a remote machine I don't want URLs that include the remote
hostname (which might not even be reachable from my local machine via that
name) or even necessarily the path relative to the remote machine. I might want
to be able to click on a filename in the output of the remote compilation but
have it open the corresponding file locally. So it might be useful to have one
or more -fdiagnostic-xxx options that allow me to set the hostname explicitly,
and/or to map from one path to another. So when I click on myfile.c on the
remote host I can get a URL to a local copy of that file (which I would edit
and push to the remote machine before recompiling).
>From gcc-bugs-return-616776-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 16:53:24 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/87488] hyperlink filenames in diagnostics
Date: Tue, 02 Oct 2018 16:53:00 -0000
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--- Comment #4 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Interesting. Is there a way to encode the line number in the URL? (and the
column number?) Or does it just give the file?
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From: "andres at anarazel dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/87489] New: Spurious -Wnonnull warning
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Bug ID: 87489
Summary: Spurious -Wnonnull warning
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Created attachment 44775
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44775&action=edit
Repro
Hi,
With the attached, obviously heavily condensed, testcase I get a spurious
-Wnonnull warning. It's quite true that the argument to strlen is NULL, but
the code isn't reachable if so. As the warning isn't phrased as "may be",
that doesn't seem quite right.
$ gcc-8 -Wnonnull -O2 -c xact.stripped.i
In function ‘XactLogCommitRecord.constprop’,
inlined from ‘RecordTransactionCommit’ at xact.stripped.i:51:3:
xact.stripped.i:44:50: warning: argument 1 null where non-null expected
[-Wnonnull]
XLogRegisterData((const char *) twophase_gid, strlen(twophase_gid) + 1);
^~~~~~~~~~~~~~~~~~~~
xact.stripped.i: In function ‘RecordTransactionCommit’:
xact.stripped.i:19:15: note: in a call to function ‘strlen’ declared here
extern size_t strlen (const char *__s)
^~~~~~
While the concrete problem in postgres only triggers for gcc-8 at -O3, the
simplified testcase triggers for 7, 8, and a recent-ish trunk, and even with
-O1.
Without the first XLogRegisterData() call the warning does not appear.
- Andres
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--- Comment #5 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Fixed.
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Subject: [Bug target/87474] ICE in extract_insn, at recog.c:2305
Date: Tue, 02 Oct 2018 17:32:00 -0000
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--- Comment #4 from acsawdey at gcc dot gnu.org ---
Author: acsawdey
Date: Tue Oct 2 17:31:53 2018
New Revision: 264799
URL: https://gcc.gnu.org/viewcvs?rev=264799&root=gcc&view=rev
Log:
2018-10-02 Aaron Sawdey <acsawdey@linux.ibm.com>
PR target/87474
* config/rs6000/rs6000-string.c (expand_strn_compare): Check that both
P8_VECTOR and VSX are enabled.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/rs6000/rs6000-string.c
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Subject: [Bug c/87488] hyperlink filenames in diagnostics
Date: Tue, 02 Oct 2018 17:33:00 -0000
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Vim already Does The Right Thing for a filename like file.c:20:23
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Subject: [Bug c/87489] Spurious -Wnonnull warning
Date: Tue, 02 Oct 2018 17:38:00 -0000
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The first XLogRegisterData could change the value of xl_xinfo.xid to be
non-zero, in which case the second XLogRegisterData call would happen despite
the null string.
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Subject: [Bug c/87489] Spurious -Wnonnull warning
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--- Comment #2 from Andres Freund <andres at anarazel dot de> ---
Maybe (In reply to Jonathan Wakely from comment #1)
> The first XLogRegisterData could change the value of xl_xinfo.xid to be
> non-zero, in which case the second XLogRegisterData call would happen
> despite the null string.
Well, that'd then still only be a ok for a "may be" warning, not one that say
"argument 1 null where" (i.e. without a may be). Also, XLogRegisterData here
takes a const char * argument, so it really shouldn't modify the argument?
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Subject: [Bug target/87474] ICE in extract_insn, at recog.c:2305
Date: Tue, 02 Oct 2018 18:09:00 -0000
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acsawdey at gcc dot gnu.org changed:
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--- Comment #5 from acsawdey at gcc dot gnu.org ---
Fixed on trunk.
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Subject: [Bug c/87488] hyperlink filenames in diagnostics
Date: Tue, 02 Oct 2018 19:51:00 -0000
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--- Comment #6 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
I think the utility of this is similar to colors, that is when the output is a
terminal, not when it is emacs or vim or any other non-tty.
In remote hosts, I think we should do whatever GNU coreutils (so far, ls) is
doing, probably no hostname at all. Most GNU/Linux distributions will use
xdg-open to open the file:// url and that seems to work without a hostname.
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Subject: [Bug rtl-optimization/87466] IRA and LRA spill all pseudos that are live across setjmp calls
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Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
URL|https://gcc.gnu.org/ml/gcc- |https://gcc.gnu.org/ml/gcc-
|patches/2018-10/msg00134.ht |patches/2018-10/msg00144.ht
|ml |ml
--- Comment #3 from Peter Bergner <bergner at gcc dot gnu.org> ---
...and resubmitted.
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/87490] New: [9 Regression] ICE in expand_builtin_strnlen at gcc/builtins.c:3164
Date: Tue, 02 Oct 2018 20:21:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87490
Bug ID: 87490
Summary: [9 Regression] ICE in expand_builtin_strnlen at
gcc/builtins.c:3164
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: law at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-linux-gnu
Following causes ICE:
$ gcc
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/execute/builtins/strnlen.c
-O1
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/execute/builtins/strnlen.c:
In function ‘test_strnlen_str_cst’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/execute/builtins/strnlen.c:25:6:
warning: ‘strnlen’ specified bound 18446744073709551615 exceeds maximum object
size 9223372036854775807 [-Wstringop-overflow=]
25 | A (strnlen ("", SIZE_MAX) == 0);
| ^~~~~~~~~~~~~~~~~~~~~~
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/execute/builtins/strnlen.c:14:5:
note: in definition of macro ‘A’
14 | ((expr) ? (void)0 \
| ^~~~
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/execute/builtins/strnlen.c:32:6:
warning: ‘strnlen’ specified bound 18446744073709551615 exceeds maximum object
size 9223372036854775807 [-Wstringop-overflow=]
32 | A (strnlen ("1", SIZE_MAX) == 1);
| ^~~~~~~~~~~~~~~~~~~~~~~
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/execute/builtins/strnlen.c:14:5:
note: in definition of macro ‘A’
14 | ((expr) ? (void)0 \
| ^~~~
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/execute/builtins/strnlen.c:33:6:
warning: ‘strnlen’ specified bound 18446744073709551614 exceeds maximum object
size 9223372036854775807 [-Wstringop-overflow=]
33 | A (strnlen ("1", -2) == 1);
| ^~~~~~~~~~~~~~~~~
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/execute/builtins/strnlen.c:14:5:
note: in definition of macro ‘A’
14 | ((expr) ? (void)0 \
| ^~~~
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/execute/builtins/strnlen.c:41:6:
warning: ‘strnlen’ specified bound 18446744073709551615 exceeds maximum object
size 9223372036854775807 [-Wstringop-overflow=]
41 | A (strnlen ("123", SIZE_MAX) == 3);
| ^~~~~~~~~~~~~~~~~~~~~~~~~
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/execute/builtins/strnlen.c:14:5:
note: in definition of macro ‘A’
14 | ((expr) ? (void)0 \
| ^~~~
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/execute/builtins/strnlen.c:42:6:
warning: ‘strnlen’ specified bound 18446744073709551614 exceeds maximum object
size 9223372036854775807 [-Wstringop-overflow=]
42 | A (strnlen ("123", -2) == 3);
| ^~~~~~~~~~~~~~~~~~~
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/execute/builtins/strnlen.c:14:5:
note: in definition of macro ‘A’
14 | ((expr) ? (void)0 \
| ^~~~
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/execute/builtins/strnlen.c:
In function ‘test_strnlen_str_range’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/execute/builtins/strnlen.c:57:6:
warning: ‘strnlen’ specified bound [1, 3] exceeds the size 0 of unterminated
array [-Wstringop-overflow=]
57 | A (strnlen ("", r_1_3) == 0);
| ^~~~~~~~~~~~~~~~~~~~~~~
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/execute/builtins/strnlen.c:14:5:
note: in definition of macro ‘A’
14 | ((expr) ? (void)0 \
| ^~~~
during RTL pass: expand
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/execute/builtins/strnlen.c:57:6:
internal compiler error: Segmentation fault
57 | A (strnlen ("", r_1_3) == 0);
| ^~~~~~~~~~~~~~~~~~~~~~~
/home/marxin/Programming/gcc/gcc/testsuite/gcc.c-torture/execute/builtins/strnlen.c:14:5:
note: in definition of macro ‘A’
14 | ((expr) ? (void)0 \
| ^~~~
0xa126df crash_signal
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/toplev.c:325
0x7ffff6bc310f ???
/usr/src/debug/glibc-2.27-6.1.x86_64/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0
0x66111b expand_builtin_strnlen
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/builtins.c:3164
0x668ad4 expand_builtin(tree_node*, rtx_def*, rtx_def*, machine_mode, int)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/builtins.c:7503
0x76f1f0 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/expr.c:10943
0x778bea store_expr(tree_node*, rtx_def*, int, bool, bool)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/expr.c:5636
0x779824 expand_assignment(tree_node*, tree_node*, bool)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/expr.c:5420
0x682160 expand_call_stmt
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/cfgexpand.c:2706
0x682160 expand_gimple_stmt_1
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/cfgexpand.c:3596
0x682160 expand_gimple_stmt
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/cfgexpand.c:3755
0x683eff expand_gimple_basic_block
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/cfgexpand.c:5791
0x687ebe execute
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/cfgexpand.c:6396
>From gcc-bugs-return-616787-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 20:22:09 2018
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Subject: [Bug tree-optimization/87490] [9 Regression] ICE in expand_builtin_strnlen at gcc/builtins.c:3164
Date: Tue, 02 Oct 2018 20:22:00 -0000
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r264787.
>From gcc-bugs-return-616788-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 20:35:55 2018
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From: "manu at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/87489] Spurious -Wnonnull warning
Date: Tue, 02 Oct 2018 20:35:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87489
Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-02
CC| |manu at gcc dot gnu.org
Component|c |middle-end
Ever confirmed|0 |1
--- Comment #3 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #1)
> The first XLogRegisterData could change the value of xl_xinfo.xid to be
> non-zero, in which case the second XLogRegisterData call would happen
> despite the null string.
This is not what is happening, though. At 083t.fixup_cfg3, GCC does propagate
the null pointer to the call of strlen(). This gets cleaned up latter so that
the whole code boils down to:
void
RecordTransactionCommit(void)
{
return;
}
but not before the ipa warn pass sees the strlen(0). When the first
XLogRegisterData() call is replace by return, the code is simple enough that
the CCP pass before the warning pass is able to simply the whole function to a
return as above, so no warning.
What is interesting is that VRP info already shows that this cannot be zero:
# RANGE [0, 9223372036854775805] NONZERO 9223372036854775807
# USE = anything
_6 = strlenD.895 (0B);
so the warning could be enhanced to look at this info if available (it is
available even at -O1). Or the pass moved later in the pipeline (after fre3).
>From gcc-bugs-return-616789-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 21:12:47 2018
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From: "michael.ploujnikov at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug ipa/87491] New: ipa_fn_summary missing for node during inlining/dumping
Date: Tue, 02 Oct 2018 21:12:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87491
Bug ID: 87491
Summary: ipa_fn_summary missing for node during
inlining/dumping
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: ipa
Assignee: unassigned at gcc dot gnu.org
Reporter: michael.ploujnikov at oracle dot com
CC: marxin at gcc dot gnu.org
Target Milestone: ---
Commit: d2c2513e2d - "Clean-up usage of ipa_fn_summary and ipa_call_summary
summaries" causes a segfault when running a test with dumping enabled:
/gcc/build/gcc/xg++ -fdump-ipa-all -dumpbase dumps
-B/gcc/build/gcc/testsuite/g++9/../../
/gcc/src/gcc/testsuite/g++.dg/opt/pr61654.C -fno-diagnostics-show-caret
-fdiagnostics-color=never -nostdinc++
-I/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include/x86_64-pc-linux-gnu
-I/gcc/build/x86_64-pc-linux-gnu/libstdc++-v3/include
-I/gcc/src/libstdc++-v3/libsupc++ -I/gcc/src/libstdc++-v3/include/backward
-I/gcc/src/libstdc++-v3/testsuite/util -fmessage-length=0 -std=gnu++98 -O3
-fno-inline-small-functions -fdump-ipa-cp
-L/gcc/build/x86_64-pc-linux-gnu/./libstdc++-v3/src/.libs
-B/gcc/build/x86_64-pc-linux-gnu/./libstdc++-v3/src/.libs
-L/gcc/build/x86_64-pc-linux-gnu/./libstdc++-v3/src/.libs
-B/gcc/build/x86_64-pc-linux-gnu/./libitm/
-L/gcc/build/x86_64-pc-linux-gnu/./libitm/.libs -lm -S -o pr61654.s
/gcc/src/gcc/testsuite/g++.dg/opt/pr61654.C:27:1: internal compiler error:
Segmentation fault
0xe866bf crash_signal
../../src/gcc/toplev.c:325
0x172b251 inline_to_all_callers_1
../../src/gcc/ipa-inline.c:2225
0x172b251 inline_to_all_callers
../../src/gcc/ipa-inline.c:2260
0xa097ce cgraph_node::call_for_symbol_and_aliases(bool (*)(cgraph_node*,
void*), void*, bool)
../../src/gcc/cgraph.h:3213
0xa097ce cgraph_node::call_for_symbol_and_aliases_1(bool (*)(cgraph_node*,
void*), void*, bool)
../../src/gcc/cgraph.c:3744
0x172d3b9 cgraph_node::call_for_symbol_and_aliases(bool (*)(cgraph_node*,
void*), void*, bool)
../../src/gcc/cgraph.h:3217
0x172d3b9 ipa_inline
../../src/gcc/ipa-inline.c:2580
0x172d3b9 execute
../../src/gcc/ipa-inline.c:2918
The segfault doesn't happen if I remove "-fdump-ipa-all -dumpbase dumps" from
the command.
Looks like ipa_fn_summaries doesn't have an entry for "int B::*.LTHUNK0(int,
int)" at the point of inlining because the only time it's actually added to the
map was in ipa_dump_fn_summary() before d2c2513e2d.
>From gcc-bugs-return-616790-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 21:57:53 2018
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Subject: [Bug fortran/56789] Wrong code with contiguous dummy argument
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Harald Anlauf <anlauf at gmx dot de> changed:
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----------------------------------------------------------------------------
CC| |anlauf at gmx dot de
--- Comment #11 from Harald Anlauf <anlauf at gmx dot de> ---
(In reply to paul.richard.thomas@gmail.com from comment #10)
> Even if that were allowed, the standard explicitly disallows the
> argument association in the testcase: See 5.3.7 of the F2008 standard.
The wording has changed in F2018 DIS, 8.5.7, paragraph 1:
The CONTIGUOUS attribute specifies that an assumed-shape array is contiguous,
that an array pointer can only be pointer associated with a contiguous target,
or that an assumed-rank dummy data object is contiguous.
In my interpretation, the testcase is valid under F2018, but invalid in F2008.
>From gcc-bugs-return-616791-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 22:05:31 2018
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Subject: [Bug middle-end/87489] Spurious -Wnonnull warning
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |msebor at gcc dot gnu.org
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
The original -Wnonnull implementation was done in the front end, making it
nearly useless (bug 17308). To improve it, the enhancement committed in
r243661 did the checking very late (in calls.c). The initial commit triggered
a flurry of warnings during bootstrap (bug 78817) due to various limitations in
GCC's optimization passes, which ultimately led to moving the implementation to
a much earlier stage where it doesn't benefit from some of the useful
optimizations that are done later.
>From gcc-bugs-return-616792-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 22:25:56 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87490] [9 Regression] ICE in expand_builtin_strnlen at gcc/builtins.c:3164
Date: Tue, 02 Oct 2018 22:25:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-02
CC| |msebor at gcc dot gnu.org
Assignee|law at redhat dot com |msebor at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> ---
Confirmed with the following simple test case:
$ cat c.c && gcc -O1 -S -Wall c.c
void f (int i)
{
int n = (i & 3) | 1;
if (__builtin_strnlen ("", n) != 0)
__builtin_abort ();
}
c.c: In function ‘f’:
c.c:5:7: warning: ‘__builtin_strnlen’ specified bound [1, 3] exceeds the size 0
of unterminated array [-Wstringop-overflow=]
5 | if (__builtin_strnlen ("", n) != 0)
| ^~~~~~~~~~~~~~~~~~~~~~~~~
during RTL pass: expand
c.c:5:7: internal compiler error: Segmentation fault
0x1137fd7 crash_signal
/ssd/src/gcc/svn/gcc/toplev.c:325
0x7e9a6f contains_struct_check(tree_node*, tree_node_structure_enum, char
const*, int, char const*)
/ssd/src/gcc/svn/gcc/tree.h:3228
0x9a1d0c expand_builtin_strnlen
/ssd/src/gcc/svn/gcc/builtins.c:3164
0x9b0ea4 expand_builtin(tree_node*, rtx_def*, rtx_def*, machine_mode, int)
/ssd/src/gcc/svn/gcc/builtins.c:7503
0xbd6116 expand_expr_real_1(tree_node*, rtx_def*, machine_mode,
expand_modifier, rtx_def**, bool)
/ssd/src/gcc/svn/gcc/expr.c:10943
0xbc8587 expand_expr_real(tree_node*, rtx_def*, machine_mode, expand_modifier,
rtx_def**, bool)
/ssd/src/gcc/svn/gcc/expr.c:8210
0xbbd2a8 store_expr(tree_node*, rtx_def*, int, bool, bool)
/ssd/src/gcc/svn/gcc/expr.c:5639
0xbbb72a expand_assignment(tree_node*, tree_node*, bool)
/ssd/src/gcc/svn/gcc/expr.c:5420
0x9f7bfd expand_call_stmt
/ssd/src/gcc/svn/gcc/cfgexpand.c:2706
0x9fad32 expand_gimple_stmt_1
/ssd/src/gcc/svn/gcc/cfgexpand.c:3596
0x9fb3ed expand_gimple_stmt
/ssd/src/gcc/svn/gcc/cfgexpand.c:3755
0xa03bac expand_gimple_basic_block
/ssd/src/gcc/svn/gcc/cfgexpand.c:5791
0xa057ae execute
/ssd/src/gcc/svn/gcc/cfgexpand.c:6396
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
>From gcc-bugs-return-616793-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 22:26:18 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87490] [9 Regression] ICE in expand_builtin_strnlen at gcc/builtins.c:3164
Date: Tue, 02 Oct 2018 22:26:00 -0000
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
--- Comment #3 from Martin Sebor <msebor at gcc dot gnu.org> ---
Let me fix it.
>From gcc-bugs-return-616794-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 22:46:12 2018
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Subject: [Bug target/72782] AVX512: No support for scalar broadcasts
Date: Tue, 02 Oct 2018 22:46:00 -0000
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--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
Please try hjl/pr72782/master branch at
https://github.com/hjl-tools/gcc
>From gcc-bugs-return-616795-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 23:02:44 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87492] New: missing warning for a strnlen call with an unterminated one-element array
Date: Tue, 02 Oct 2018 23:02:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87492
Bug ID: 87492
Summary: missing warning for a strnlen call with an
unterminated one-element array
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: msebor at gcc dot gnu.org
Target Milestone: ---
In the following test case, the first strnlen call is diagnosed as expected but
the second one isn't despite both reading past the end of the unterminated
arrays.
$ cat c.c && /ssd/build/gcc-svn/gcc/xgcc -B /ssd/build/gcc-svn/gcc -O2 -S -Wall
-fdump-tree-optimized=/dev/stdout c.c
const char a[2] = "12";
void f (void)
{
if (__builtin_strnlen (a, 4) != 0) // warning (good)
__builtin_abort ();
}
const char b[1] = "1";
void g (void)
{
if (__builtin_strnlen (b, 4) != 0) // missing warning
__builtin_abort ();
}
;; Function f (f, funcdef_no=0, decl_uid=1907, cgraph_uid=1, symbol_order=1)
f ()
{
long unsigned int _1;
<bb 2> [local count: 1073741824]:
_1 = __builtin_strnlen (&a, 4);
if (_1 != 0)
goto <bb 3>; [0.00%]
else
goto <bb 4>; [99.96%]
<bb 3> [count: 0]:
__builtin_abort ();
<bb 4> [local count: 1073312328]:
return;
}
c.c: In function ‘f’:
c.c:5:7: warning: ‘__builtin_strnlen’ specified bound 4 exceeds the size 2 of
unterminated array [-Wstringop-overflow=]
5 | if (__builtin_strnlen (a, 4) != 0) // warning (good)
| ^~~~~~~~~~~~~~~~~~~~~~~~
c.c:1:12: note: referenced argument declared here
1 | const char a[2] = "12";
| ^
;; Function g (g, funcdef_no=1, decl_uid=1911, cgraph_uid=2, symbol_order=3)
g ()
{
<bb 2> [local count: 1073741824]:
return;
}
>From gcc-bugs-return-616796-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Oct 02 23:49:50 2018
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Subject: [Bug libstdc++/87493] New: chrono::system_clock unusable with std::tm due to misaligned precisions
Date: Tue, 02 Oct 2018 23:49:00 -0000
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Bug ID: 87493
Summary: chrono::system_clock unusable with std::tm due to
misaligned precisions
Product: gcc
Version: 8.2.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
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This code doesn't work:
std::tm cal_time;
cal_time.tm_year = year;
cal_time.tm_mon = month;
cal_time.tm_mday = day;
cal_time.tm_hour = hour;
cal_time.tm_min = min;
cal_time.tm_sec = sec;
std::time_t t1, t2;
t1 = timegm(&cal_time);
auto mydt = std::chrono::system_clock::from_time_t(t1);
t2 = std::chrono::system_clock::to_time_t(mydt);
assert(t1 == t2);
I tracked the problem down to libstdc++ sources codes.
system_clock::duration is nanoseconds:
https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libstdc%2B%2B-v3/include/std/chrono;h=871c896144a23f37de858668a16388a4bc884d56;hb=HEAD#l830
and nanoseconds is backed by int64_t:
https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libstdc%2B%2B-v3/include/std/chrono;h=871c896144a23f37de858668a16388a4bc884d56;hb=HEAD#l605
However, seconds is used to convert between time_t and
chrono::system_clock::time_point:
https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libstdc%2B%2B-v3/include/std/chrono;h=871c896144a23f37de858668a16388a4bc884d56;hb=HEAD#l855
And seconds is backed by a int64_t too:
https://gcc.gnu.org/git/?p=gcc.git;a=blob;f=libstdc%2B%2B-v3/include/std/chrono;h=871c896144a23f37de858668a16388a4bc884d56;hb=HEAD#l614
There is no way to preserve time_t value between conversions involving
chrono::system_clock::time_point and time_t.
>From gcc-bugs-return-616797-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 01:03:39 2018
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Subject: [Bug libstdc++/87493] chrono::system_clock unusable with std::tm due to misaligned precisions
Date: Wed, 03 Oct 2018 01:03:00 -0000
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I don't see an issue here. The standard does not say it needs to work either.
>From gcc-bugs-return-616798-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 02:17:23 2018
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Subject: [Bug c++/56272] Poor diagnostics for error: specialization of ... after instantiation
Date: Wed, 03 Oct 2018 02:17:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org,
| |dodji at gcc dot gnu.org
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing diagnostics maintainers
>From gcc-bugs-return-616799-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 02:25:23 2018
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Subject: [Bug c++/68230] Unused function parameters not reported by -Wunused-parameter when only used recursively.
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--- Comment #9 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Joshua T, Fisher from comment #8)
> (In reply to Jonathan Wakely from comment #7)
> > (In reply to Joshua T, Fisher from comment #5)
> > > and my blog where I first encountered this in a closed source codebase:
> > >
> > > http://www.nullterminatedstrings.com/c++/recursive-warning
> >
> > I'm a bit more persuaded having read this. If it points out you forgot to
> > use it (for anything except the recursion) that could help find real bugs.
>
> That's what I was hoping! I feel like it's definitely something that could
> hit some real code bases. I find it unlikely I'm the only person ever to run
> into this.
Maybe it'd be possible to put it under a separate flag (e.g.
-Wparameter-only-used-recursively) so that it'd be easier to focus on just that
kind of warning individually? There are some codebases that turn off
-Wunused-parameter specifically that still might want this warning.
>From gcc-bugs-return-616800-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 02:28:47 2018
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Subject: [Bug c/39170] provide an option to silence -Wconversion warnings for bit-fields
Date: Wed, 03 Oct 2018 02:28:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=87406
--- Comment #21 from Eric Gallager <egallager at gcc dot gnu.org> ---
Possibly related to bug 87406 which requests adding clang's
-Wbitfield-constant-conversion
>From gcc-bugs-return-616801-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 02:29:57 2018
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Subject: [Bug c++/87406] Implement -Wconstant-conversion and -Wbitfield-constant-conversion
Date: Wed, 03 Oct 2018 02:29:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
Is clang's -Wbitfield-constant-conversion anything like the
-Wbitfield-conversion flag requested in bug 39170?
>From gcc-bugs-return-616802-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 02:35:11 2018
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Subject: [Bug target/15896] Strange behaviour for inline assembler input constraint
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #3 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #2)
> (In reply to Andrew Pinski from comment #1)
> > I don't know Ada that well (in terms of promotions and types) but the
> > following C code produces the
> > same ICE so I might assume the issue is that My_Type+constant is being
> > promoted to unsigned long
> > long or something along that line:
> > int f()
> > {
> > unsigned long long cu32 = 1;
> > asm("%0"::"a"(cu32));
> > }
>
> Does this still happen with newer versions of GCC? I can't reproduce with
> gcc 7, but I'm assuming that's due to target differences; I get different
> messages depending on 32-bit or 64-bit, but neither of them are an ICE:
>
> $ gcc -c -m32 15896.c
> 15896.c: In function 'f':
> 15896.c:4:3: error: inconsistent operand constraints in an 'asm'
> asm("%0"::"a"(cu32));
> ^~~
> $ gcc -c -m64 15896.c
> 15896.c:4:Junk character 37 (%).
> 15896.c:4:Rest of line ignored. 1st junk character valued 114 (r).
> $
WAITING on a reply
>From gcc-bugs-return-616803-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 02:36:54 2018
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Subject: [Bug libstdc++/54005] Use __atomic_always_lock_free in libstdc++ is_lock_free instead of __atomic_is_lock_free
Date: Wed, 03 Oct 2018 02:36:00 -0000
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--- Comment #19 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #18)
> (In reply to Hans-Peter Nilsson from comment #16)
> > (In reply to Jonathan Wakely from comment #14)
> > > Can we close this?
> >
> > No. IIUC, we're still/again using __atomic_is_lock_free with alignment
> > deduced from the current object rather than the type (even though it's now a
> > proxy-object; the faked pointer is constructed from the alignment of the
> > current object).
>
> It's constructed from __alignof(_M_i) and since r221945 that is given a
> fixed alignment:
>
> static constexpr int _S_alignment =
> sizeof(_ITp) > alignof(_ITp) ? sizeof(_ITp) : alignof(_ITp);
>
> alignas(_S_alignment) __int_type _M_i;
>
> So it will be the same for all objects of the type.
>
> There was an additional fix in r227878 for Bug 65913.
>
> > So, r221701 was wrong to change from null to the alignment-deduced
> > fake-pointer.
>
> I think the current code is right, and per-type.
>
> I still want to close this.
With what resolution? FIXED? WORKSFORME?
>From gcc-bugs-return-616804-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 02:40:56 2018
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Subject: [Bug middle-end/56363] over aggressive division folding ignores sign conversion
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--- Comment #8 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Jay from comment #7)
>
>
> Perhaps I'll try with trunk.
>
>
> - Jay
Have you tried with trunk yet?
>From gcc-bugs-return-616805-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 03:12:46 2018
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Subject: [Bug other/85716] No easy way for end-user to tell what GCC is doing when compilation is slow
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sandra at gcc dot gnu.org changed:
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--- Comment #9 from sandra at gcc dot gnu.org ---
Just to clarify, I didn't have anything to do with proposing a "progress bar";
I just needed to know whether the split1 pass had run yet. And I ended up
solving that problem by using a property instead of a dynamic pass numbering
thing.
>From gcc-bugs-return-616806-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 04:11:53 2018
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Subject: [Bug libstdc++/54005] Use __atomic_always_lock_free in libstdc++ is_lock_free instead of __atomic_is_lock_free
Date: Wed, 03 Oct 2018 04:11:00 -0000
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--- Comment #20 from Hans-Peter Nilsson <hp at gcc dot gnu.org> ---
Please allow a couple of days so I can catch up.
Thanks.
>From gcc-bugs-return-616807-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 06:40:24 2018
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Subject: [Bug testsuite/86766] new test case c-c++-common/spec-barrier-1.c introduced in r263168 fails
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> ---
This was fixed, I think on 2018-08-01 already.
>From gcc-bugs-return-616808-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 06:42:29 2018
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Subject: [Bug rtl-optimization/86928] ICE in compute_live, at sel-sched.c:3097
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Last reconfirmed| |2018-10-03
CC| |segher at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Confirmed. Needs -m32.
>From gcc-bugs-return-616809-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 06:52:48 2018
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Subject: [Bug target/86592] [9 regression] gcc.target/powerpc/p8-vec-xl-xst-v2.c fails starting with r261510
Date: Wed, 03 Oct 2018 06:52:00 -0000
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--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Is this fixed now?
>From gcc-bugs-return-616810-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 06:54:46 2018
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Subject: [Bug target/86731] [8/9 Regression] Miscompiles vec_sl at -O3 with -fwrapv on ppc64el
Date: Wed, 03 Oct 2018 06:54:00 -0000
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--- Comment #4 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Is this fixed now?
>From gcc-bugs-return-616811-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 07:02:25 2018
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Subject: [Bug ipa/87491] ipa_fn_summary missing for node during inlining/dumping
Date: Wed, 03 Oct 2018 07:02:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-10-03
Assignee|unassigned at gcc dot gnu.org |marxin at gcc dot gnu.org
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--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed and mine.
>From gcc-bugs-return-616812-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 07:09:12 2018
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Subject: [Bug rtl-optimization/86087] ICE in rtl_verify_fallthru, at cfgrtl.c:2911 (error: verify_flow_info: Incorrect fallthru 8->9; error: wrong insn in the fallthru edge)
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |segher at gcc dot gnu.org
--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
I cannot reproduce this easily (it requires graphite).
>From gcc-bugs-return-616813-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 07:49:27 2018
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From: "sameerad at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/87330] ICE in scan_rtx_reg, at regrename.c:1097
Date: Wed, 03 Oct 2018 07:49:00 -0000
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--- Comment #5 from sameerad at gcc dot gnu.org ---
The original regrename pass is renaming the register x19 to x25, however, the
expr_list which holds the dead register information is not updated accordingly.
Hence, there is a conflict of register names when same information is accessed
again by tag collision pass.
The fix is under testing.
>From gcc-bugs-return-616814-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 08:20:49 2018
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Subject: [Bug ipa/87491] [9 Regression] ipa_fn_summary missing for node during inlining/dumping
Date: Wed, 03 Oct 2018 08:20:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |8.2.0
Version|unknown |9.0
Target Milestone|--- |9.0
Summary|ipa_fn_summary missing for |[9 Regression]
|node during |ipa_fn_summary missing for
|inlining/dumping |node during
| |inlining/dumping
Known to fail| |9.0
>From gcc-bugs-return-616815-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 08:32:11 2018
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Subject: [Bug gcov-profile/86109] [8/9 Regression] gcov reports lines in lambdas as not executable
Date: Wed, 03 Oct 2018 08:32:00 -0000
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Oct 3 08:30:10 2018
New Revision: 264806
URL: https://gcc.gnu.org/viewcvs?rev=264806&root=gcc&view=rev
Log:
Properly mark lambdas in GCOV (PR gcov-profile/86109).
2018-10-03 Martin Liska <mliska@suse.cz>
PR gcov-profile/86109
* coverage.c (coverage_begin_function): Do not
mark lambdas as artificial.
* tree-core.h (struct GTY): Remove tm_clone_flag
and introduce new lambda_function.
* tree.h (DECL_LAMBDA_FUNCTION): New macro.
2018-10-03 Martin Liska <mliska@suse.cz>
PR gcov-profile/86109
* parser.c (cp_parser_lambda_declarator_opt):
Set DECL_LAMBDA_FUNCTION for lambdas.
2018-10-03 Martin Liska <mliska@suse.cz>
PR gcov-profile/86109
* g++.dg/gcov/pr86109.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/gcov/pr86109.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/coverage.c
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/parser.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-core.h
trunk/gcc/tree.h
>From gcc-bugs-return-616816-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 08:35:40 2018
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Subject: [Bug rtl-optimization/86087] ICE in rtl_verify_fallthru, at cfgrtl.c:2911 (error: verify_flow_info: Incorrect fallthru 8->9; error: wrong insn in the fallthru edge)
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--- Comment #2 from Arseny Solokha <asolokha at gmx dot com> ---
Indeed, I cannot reproduce it w/ gcc-9.0.0-alpha20180930 (r264727).
>From gcc-bugs-return-616817-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 08:36:06 2018
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Subject: [Bug gcov-profile/86109] [8/9 Regression] gcov reports lines in lambdas as not executable
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |8.2.1
Known to fail|8.1.0 |
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed on trunk so far.
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Subject: [Bug rtl-optimization/87485] [9 Regression] Compile time hog w/ -O2 -fschedule-insns -fno-guess-branch-probability -fno-isolate-erroneous-paths-dereference -fno-omit-frame-pointer -fno-split-wide-types -fno-tree-ccp -fno-tree-sra
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87485
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-10-03
CC| |marxin at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Can't confirm, can you please paste content of --verbose option?
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Subject: [Bug c++/70037] [concepts] comdat group error and an ICE with a conceptified tuple implementation
Date: Wed, 03 Oct 2018 08:46:00 -0000
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--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
So, is this fixed as duplicate of PR69515?
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Subject: [Bug c/87482] Clarify behaviour of resolvers with parameters in for __attribute__((ifunc))
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--- Comment #4 from Peter Smith <peter.smith at linaro dot org> ---
Thanks very much for the clarification.
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Subject: [Bug rtl-optimization/87485] [9 Regression] Compile time hog w/ -O2 -fschedule-insns -fno-guess-branch-probability -fno-isolate-erroneous-paths-dereference -fno-omit-frame-pointer -fno-split-wide-types -fno-tree-ccp -fno-tree-sra
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87485
--- Comment #3 from Arseny Solokha <asolokha at gmx dot com> ---
% x86_64-pc-linux-gnu-gcc-9.0.0-alpha20180930 -O2 -fschedule-insns
-fno-guess-branch-probability -fno-isolate-erroneous-paths-dereference
-fno-omit-frame-pointer -fno-split-wide-types -fno-tree-ccp -fno-tree-sra -w -c
wo2ahro9.c --verbose
Using built-in specs.
COLLECT_GCC=x86_64-pc-linux-gnu-gcc-9.0.0-alpha20180930
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-9.0.0_alpha20180930/work/gcc-9-20180930/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/9.0.0-alpha20180930
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/9.0.0-alpha20180930/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/9.0.0-alpha20180930
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/9.0.0-alpha20180930/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/9.0.0-alpha20180930/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/9.0.0-alpha20180930/include/g++-v9
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/9.0.0-alpha20180930/python
--enable-languages=c,c++ --enable-obsolete --enable-secureplt --disable-werror
--with-system-zlib --disable-nls --enable-checking=yes --disable-esp
--enable-libstdcxx-time --disable-libstdcxx-pch --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--disable-multilib --with-multilib-list=m64 --disable-altivec
--disable-fixed-point --enable-targets=all --enable-libgomp
--disable-libmudflap --disable-libssp --disable-libmpx --disable-systemtap
--disable-vtable-verify --disable-libvtv --disable-libquadmath --enable-lto
--with-isl --disable-isl-version-check --disable-libsanitizer
--enable-default-pie --enable-default-ssp
Thread model: posix
gcc version 9.0.0-alpha20180930 20180930 (experimental) (GCC)
COLLECT_GCC_OPTIONS='-O2' '-fschedule-insns' '-fno-guess-branch-probability'
'-fno-isolate-erroneous-paths-dereference' '-fno-omit-frame-pointer'
'-fno-split-wide-types' '-fno-tree-ccp' '-fno-tree-sra' '-w' '-c' '-v'
'-mtune=generic' '-march=x86-64'
/usr/libexec/gcc/x86_64-pc-linux-gnu/9.0.0-alpha20180930/cc1 -quiet -v
wo2ahro9.c -quiet -dumpbase wo2ahro9.c -mtune=generic -march=x86-64 -auxbase
wo2ahro9 -O2 -w -version -fschedule-insns -fno-guess-branch-probability
-fno-isolate-erroneous-paths-dereference -fno-omit-frame-pointer
-fno-split-wide-types -fno-tree-ccp -fno-tree-sra -o /tmp/ccMuyRPu.s
GNU C17 (GCC) version 9.0.0-alpha20180930 20180930 (experimental)
(x86_64-pc-linux-gnu)
compiled by GNU C version 9.0.0-alpha20180930 20180930 (experimental),
GMP version 6.1.2, MPFR version 4.0.1, MPC version 1.1.0, isl version
isl-0.20-GMP
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
ignoring nonexistent directory "/usr/local/include"
ignoring nonexistent directory
"/usr/lib/gcc/x86_64-pc-linux-gnu/9.0.0-alpha20180930/../../../../x86_64-pc-linux-gnu/include"
#include "..." search starts here:
#include <...> search starts here:
/usr/lib/gcc/x86_64-pc-linux-gnu/9.0.0-alpha20180930/include
/usr/lib/gcc/x86_64-pc-linux-gnu/9.0.0-alpha20180930/include-fixed
/usr/include
End of search list.
GNU C17 (GCC) version 9.0.0-alpha20180930 20180930 (experimental)
(x86_64-pc-linux-gnu)
compiled by GNU C version 9.0.0-alpha20180930 20180930 (experimental),
GMP version 6.1.2, MPFR version 4.0.1, MPC version 1.1.0, isl version
isl-0.20-GMP
GGC heuristics: --param ggc-min-expand=30 --param ggc-min-heapsize=4096
Compiler executable checksum: 7ddb5283a960f24fa6ae96c9b977a55b
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87406] Implement -Wconstant-conversion and -Wbitfield-constant-conversion
Date: Wed, 03 Oct 2018 09:12:00 -0000
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #3)
> Is clang's -Wbitfield-constant-conversion anything like the
> -Wbitfield-conversion flag requested in bug 39170?
It's similar, but if I see correctly the LLVM warning is only about constants:
https://godbolt.org/z/srLT8m
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Subject: [Bug rtl-optimization/86087] ICE in rtl_verify_fallthru, at cfgrtl.c:2911 (error: verify_flow_info: Incorrect fallthru 8->9; error: wrong insn in the fallthru edge)
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
--- Comment #3 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Okay, let's close it then.
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Subject: [Bug gcov-profile/86109] [8/9 Regression] gcov reports lines in lambdas as not executable
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--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Wed Oct 3 09:24:38 2018
New Revision: 264807
URL: https://gcc.gnu.org/viewcvs?rev=264807&root=gcc&view=rev
Log:
Backport r264806
2018-10-03 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-10-03 Martin Liska <mliska@suse.cz>
PR gcov-profile/86109
* coverage.c (coverage_begin_function): Do not
mark lambdas as artificial.
* tree-core.h (struct GTY): Remove tm_clone_flag
and introduce new lambda_function.
* tree.h (DECL_LAMBDA_FUNCTION): New macro.
2018-10-03 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-10-03 Martin Liska <mliska@suse.cz>
PR gcov-profile/86109
* parser.c (cp_parser_lambda_declarator_opt):
Set DECL_LAMBDA_FUNCTION for lambdas.
2018-10-03 Martin Liska <mliska@suse.cz>
Backport from mainline
2018-10-03 Martin Liska <mliska@suse.cz>
PR gcov-profile/86109
* g++.dg/gcov/pr86109.C: New test.
Added:
branches/gcc-8-branch/gcc/testsuite/g++.dg/gcov/pr86109.C
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/coverage.c
branches/gcc-8-branch/gcc/cp/ChangeLog
branches/gcc-8-branch/gcc/cp/parser.c
branches/gcc-8-branch/gcc/testsuite/ChangeLog
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>From gcc-bugs-return-616825-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 09:32:48 2018
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From: "paolo.carlini at oracle dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/71140] [concepts] ill-formed nested-requirement lacking a semicolon not rejected
Date: Wed, 03 Oct 2018 09:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71140
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-10-03
Assignee|unassigned at gcc dot gnu.org |paolo.carlini at oracle dot com
Ever confirmed|0 |1
--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Mine.
>From gcc-bugs-return-616826-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 09:34:32 2018
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From: "froydnj at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87494] New: hidden visibility constexpr variables left unevaluated
Date: Wed, 03 Oct 2018 09:34:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87494
Bug ID: 87494
Summary: hidden visibility constexpr variables left unevaluated
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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The following testcase, reduced from Firefox:
#pragma GCC visibility push(hidden)
typedef int size_t;
class A;
class B {
A *m_fn1() const;
bool mBaseVal;
};
class A {};
class nsStaticAtom : public A {};
namespace mozilla {
namespace detail {
struct GkAtoms {
enum { F, T, AtomsCount };
nsStaticAtom mAtoms[AtomsCount];
} extern gGkAtoms;
}
}
class nsGkAtoms {
public:
static constexpr nsStaticAtom *_false =
&mozilla::detail::gGkAtoms.mAtoms[size_t(mozilla::detail::GkAtoms::F)];
static constexpr nsStaticAtom *_true =
&mozilla::detail::gGkAtoms.mAtoms[size_t(mozilla::detail::GkAtoms::T)];
};
A *B::m_fn1() const { return mBaseVal ? nsGkAtoms::_true : nsGkAtoms::_false; }
when compiled with x86-64 GCC version 8.2, gives:
cmpb $0, (%rdi)
movq _ZN9nsGkAtoms6_falseE(%rip), %rax
je .L1
movq _ZN9nsGkAtoms5_trueE(%rip), %rax
.L1:
ret
which leads to link failures, because neither symbol is defined.
Removing the #pragma gives correct output:
cmpb $0, (%rdi)
movq _ZN7mozilla6detail8gGkAtomsE@GOTPCREL(%rip), %rax
jne .L3
ret
.L3:
addq $1, %rax
ret
Very curiously, so does changing B::m_fn1() to:
A *B::m_fn1() const { return mBaseVal ? (nsStaticAtom*)nsGkAtoms::_true :
nsGkAtoms::_false; }
which gives slightly different, but still correct, assembly:
leaq 1+_ZN7mozilla6detail8gGkAtomsE(%rip), %rax
cmpb $0, (%rdi)
leaq -1(%rax), %rdx
cmove %rdx, %rax
ret
>From gcc-bugs-return-616827-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 09:56:11 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug gcov-profile/86109] gcov reports lines in lambdas as not executable
Date: Wed, 03 Oct 2018 09:56:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Known to work| |9.0
Resolution|--- |FIXED
Summary|[8/9 Regression] gcov |gcov reports lines in
|reports lines in lambdas as |lambdas as not executable
|not executable |
Known to fail|9.0 |
--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed on all active branches.
>From gcc-bugs-return-616828-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 10:15:52 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/54005] Use __atomic_always_lock_free in libstdc++ is_lock_free instead of __atomic_is_lock_free
Date: Wed, 03 Oct 2018 10:15:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|bkoz at gcc dot gnu.org |unassigned at gcc dot gnu.org
--- Comment #21 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #19)
> (In reply to Jonathan Wakely from comment #18)
> > I still want to close this.
>
> With what resolution? FIXED? WORKSFORME?
FIXED, I think, as we do the right thing now.
But there's no rush, I'd rather wait and get HP's input.
>From gcc-bugs-return-616829-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 10:16:12 2018
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Subject: [Bug libstdc++/87493] chrono::system_clock unusable with std::tm due to misaligned precisions
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |WAITING
Last reconfirmed| |2018-10-03
Ever confirmed|0 |1
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is not a valid bug report, please provide a proper testcase and the other
information requested at https://gcc.gnu.org/bugs/
As documented at the following pages, those functions are potentially lossy if
the precisions aren't the same (which isn't a problem for POSIX because
std::time_t measures seconds anyway):
https://en.cppreference.com/w/cpp/chrono/system_clock/to_time_t
https://en.cppreference.com/w/cpp/chrono/system_clock/from_time_t
>From gcc-bugs-return-616830-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 10:23:06 2018
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87478] [DR 1980] Hidden member function falsely takes part in qualified name lookup
Date: Wed, 03 Oct 2018 10:23:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |SUSPENDED
Summary|Hidden member function |[DR 1980] Hidden member
|falsely takes part in |function falsely takes part
|qualified name lookup |in qualified name lookup
--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Yes, it's that issue again, thanks.
>From gcc-bugs-return-616831-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 10:35:58 2018
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Subject: =?UTF-8?B?W0J1ZyBmb3J0cmFuLzg3NDk1XSBOZXc6IFdhcm5pbmc6IOKAmGZhc3RjYWxs?= =?UTF-8?B?4oCZIGF0dHJpYnV0ZSBpZ25vcmVkIFstV2F0dHJpYnV0ZXNdIGZvciAhR0ND?= =?UTF-8?B?JCBBVFRSSUJVVEVT?Date: Wed, 03 Oct 2018 10:35:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87495
Bug ID: 87495
Summary: Warning: ‘fastcall’ attribute ignored [-Wattributes]
for !GCC$ ATTRIBUTES
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Assignee: unassigned at gcc dot gnu.org
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Looks GCC ATTRIBUTES are broken:
$ cat fortran-options.f90
program test
interface
subroutine sub1()
end subroutine sub1
subroutine sub2()
!GCC$ ATTRIBUTES CDECL :: sub2
end subroutine sub2
subroutine sub3()
!GCC$ ATTRIBUTES STDCALL :: sub3
end subroutine sub3
subroutine sub4()
!GCC$ ATTRIBUTES FASTCALL :: sub4
end subroutine sub4
end interface
!gcc$ attributes cdecl :: cdecl
!gcc$ attributes stdcall :: stdcall
procedure(), pointer :: ptr
procedure(), pointer :: cdecl
procedure(), pointer :: stdcall
procedure(), pointer :: fastcall
!gcc$ attributes fastcall :: fastcall
! Valid:
ptr => sub1
cdecl => sub2
stdcall => sub3
fastcall => sub4
end program
$ gfortran fortran-options.f90 -c
fortran-options.f90:26:0:
cdecl => sub2
Warning: ‘cdecl’ attribute ignored [-Wattributes]
fortran-options.f90:26:0: Warning: ‘cdecl’ attribute ignored [-Wattributes]
fortran-options.f90:27:0:
stdcall => sub3
Warning: ‘stdcall’ attribute ignored [-Wattributes]
fortran-options.f90:27:0: Warning: ‘stdcall’ attribute ignored [-Wattributes]
fortran-options.f90:28:0:
fastcall => sub4
Warning: ‘fastcall’ attribute ignored [-Wattributes]
fortran-options.f90:28:0: Warning: ‘fastcall’ attribute ignored [-Wattributes]
It's for GCC 7.1.0+. Very old versions (4.8.0+) also suffer.
In between 5.1.0 and 6.4.0 I see ICE that was fixed in r246203.
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Subject: [Bug fortran/56789] Wrong code with contiguous dummy argument
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--- Comment #12 from Paul Thomas <pault at gcc dot gnu.org> ---
(In reply to Harald Anlauf from comment #11)
> (In reply to paul.richard.thomas@gmail.com from comment #10)
> > Even if that were allowed, the standard explicitly disallows the
> > argument association in the testcase: See 5.3.7 of the F2008 standard.
>
> The wording has changed in F2018 DIS, 8.5.7, paragraph 1:
>
> The CONTIGUOUS attribute specifies that an assumed-shape array is contiguous,
> that an array pointer can only be pointer associated with a contiguous
> target,
> or that an assumed-rank dummy data object is contiguous.
>
>
> In my interpretation, the testcase is valid under F2018, but invalid in
> F2008.
Hmmm! The F2018 standard is almost obfusticating about argument association
with contiguous dummies. I will wade through the pertinent sections tonight.
Paul
>From gcc-bugs-return-616833-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 10:39:16 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/87496] New: ICE in aggregate_value_p at gcc/function.c:2046
Date: Wed, 03 Oct 2018 10:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87496
Bug ID: 87496
Summary: ICE in aggregate_value_p at gcc/function.c:2046
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
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Maybe similar to PR87133:
$ gcc /home/marxin/Programming/gcc/gcc/testsuite/gfortran.dg/pr41928.f90
-mno-popcntd
...
internal compiler error: Segmentation fault
0xac9d2f crash_signal
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/toplev.c:325
0x7ffff6bc310f ???
/usr/src/debug/glibc-2.27-6.1.x86_64/signal/../sysdeps/unix/sysv/linux/x86_64/sigaction.c:0
0x8724cb aggregate_value_p(tree_node const*, tree_node const*)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/function.c:2046
0x72b2b4 emit_library_call_value_1(int, rtx_def*, rtx_def*, libcall_type,
machine_mode, int, std::pair<rtx_def*, machine_mode>*)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/calls.c:4747
0x82d5a4 emit_library_call_value(rtx_def*, rtx_def*, libcall_type,
machine_mode, rtx_def*, machine_mode)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/rtl.h:4185
0x82d5a4 convert_mode_scalar
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/expr.c:329
0x82d5a4 convert_move(rtx_def*, rtx_def*, int)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/expr.c:271
0x82e232 convert_modes(machine_mode, machine_mode, rtx_def*, int)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/expr.c:712
0x9f2277 expand_fix(rtx_def*, rtx_def*, int)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/optabs.c:4930
0x838b14 expand_expr_real_2(separate_ops*, rtx_def*, machine_mode,
expand_modifier)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/expr.c:8961
0x73c5c1 expand_gimple_stmt_1
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/cfgexpand.c:3694
0x73c5c1 expand_gimple_stmt
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/cfgexpand.c:3755
0x73dfdf expand_gimple_basic_block
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/cfgexpand.c:5791
0x741f9e execute
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/cfgexpand.c:6396
>From gcc-bugs-return-616834-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 10:43:41 2018
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Subject: [Bug rtl-optimization/87485] [9 Regression] Compile time hog w/ -O2 -fschedule-insns -fno-guess-branch-probability -fno-isolate-erroneous-paths-dereference -fno-omit-frame-pointer -fno-split-wide-types -fno-tree-ccp -fno-tree-sra
Date: Wed, 03 Oct 2018 10:43:00 -0000
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Unfortunately can't reproduce even with your complete option list.
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Subject: [Bug libstdc++/63776] [C++11] Regex collate matching not working
Date: Wed, 03 Oct 2018 10:48:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Resolution|--- |INVALID
--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Tim Shen from comment #8)
> I don't think std::regex_match<BiIter, Alloc, char, RegexTraits> should care
> about decoding a char string to wchar_t string and call
> std::regex_match<AnotherBiIter, AnotherAlloc, wchar_t,
> std::regex_traits<wchar_t>>, leaving user defined RegexTraits potentially
> unused.
I agree.
> Instead, user can maually decode the utf-8 string (I'm sad we don't have a
> standard char iterator adaptor which converts a utf-8 char iterator to
> char32_t iterator) and call std::regex_match<..., wchar_t, ...>.
Agreed.
> These are my understanding, so it's surely possible that I may miss
> something.
>
> Thoughts?
Having looked through this again, I think you're right.
So this reduced test case is not expected to pass:
#include <regex>
#include <cassert>
int main()
{
std::locale::global(std::locale("en_US.UTF-8"));
std::string s = "joão méroço";
std::regex r{"[[:alpha:]]{4} [[:alpha:]]{6}"};
assert( regex_match(s, r) );
}
But this is (assuming wchar_t uses a unicode encoding):
#include <regex>
#include <cassert>
int main()
{
std::locale::global(std::locale("en_US.UTF-8"));
std::string s = "joão méroço";
std::regex r{"[[:alpha:]]{4} [[:alpha:]]{6}"};
assert( regex_match(s, r) );
}
>From gcc-bugs-return-616837-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 10:59:26 2018
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Subject: [Bug other/87353] gcc man page formatting issue due to leading spaces in .texi contents
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--- Comment #7 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed Oct 3 10:58:49 2018
New Revision: 264810
URL: https://gcc.gnu.org/viewcvs?rev=264810&root=gcc&view=rev
Log:
PR other/87353 fix formatting and grammar in manual
The changes to invoke.texi in r242433 left some unwanted spaces that
texi2pod.pl interprets as verbatim formatting. There are also some
grammatical errors due to the removal of references to GCJ, where the
G++ driver is referred to in the plural.
PR other/87353
* doc/invoke.texi (Link Options): Fix formatting and grammar.
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/doc/invoke.texi
>From gcc-bugs-return-616836-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 10:59:21 2018
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Subject: [Bug other/87353] gcc man page formatting issue due to leading spaces in .texi contents
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--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed Oct 3 10:58:43 2018
New Revision: 264809
URL: https://gcc.gnu.org/viewcvs?rev=264809&root=gcc&view=rev
Log:
PR other/87353 fix formatting and grammar in manual
The changes to invoke.texi in r242433 left some unwanted spaces that
texi2pod.pl interprets as verbatim formatting. There are also some
grammatical errors due to the removal of references to GCJ, where the
G++ driver is referred to in the plural.
PR other/87353
* doc/invoke.texi (Link Options): Fix formatting and grammar.
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/doc/invoke.texi
>From gcc-bugs-return-616838-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 11:02:08 2018
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Subject: [Bug other/87353] gcc man page formatting issue due to leading spaces in .texi contents
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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Resolution|--- |FIXED
--- Comment #8 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Done
>From gcc-bugs-return-616840-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 11:28:49 2018
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59439
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #13 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Fixed for gcc 9.
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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/59439] std::locale uses atomic instructions on construction
Date: Wed, 03 Oct 2018 11:28:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59439
--- Comment #12 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Author: redi
Date: Wed Oct 3 11:27:40 2018
New Revision: 264811
URL: https://gcc.gnu.org/viewcvs?rev=264811&root=gcc&view=rev
Log:
PR libstdc++/59439 optimize uses of classic ("C") std::locale
The global locale::_Impl that represents the "C" locale is never
destroyed, so there is no need to keep track of reference count updates
for that object. This greatly reduce contention between threads that
refer to the classic locale. Since the global std::locale initially uses
the classic locale, this benefits the common case for any code using the
global locale, such as construction/destruction of iostream objects.
All these updates are done inside libstdc++.so so there's no need to
worry about users' objects having inlined old versions of the code which
still update the reference count for the classic locale.
PR libstdc++/59439
* src/c++98/locale.cc (locale::locale(const locale&)): Bypass
reference count updates for the classic locale.
(locale::~locale()): Likewise.
(locale::operator=(const locale&)): Likewise.
* src/c++98/locale_init.cc (locale::locale()): Likewise.
(locale::global(const locale&)): Likewise.
Modified:
trunk/libstdc++-v3/ChangeLog
trunk/libstdc++-v3/src/c++98/locale.cc
trunk/libstdc++-v3/src/c++98/locale_init.cc
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Subject: [Bug target/87496] ICE in aggregate_value_p at gcc/function.c:2046
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87496
Segher Boessenkool <segher at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Ever confirmed|0 |1
--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Needs -mcpu=power7 (or power8, but not power9) -mno-popcntd -m64. Confirmed.
>From gcc-bugs-return-616842-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 11:33:13 2018
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From: "rsandifo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87497] New: constexprs involving non-literal const variables are incorrectly accepted
Date: Wed, 03 Oct 2018 11:33:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87497
Bug ID: 87497
Summary: constexprs involving non-literal const variables are
incorrectly accepted
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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G++ accepts:
struct s { volatile int x; int y; };
constexpr int foo (const s &s1) { return s1.y; }
void g () { const s local_s = { 1, 2 }; constexpr int a = foo (local_s); }
even though "local_s" is only const, not constexpr (and couldn't be constexpr
due to having a non-literal type).
From Jonathan on IRC:
I think for foo(local_s) to be a constant expression, local_s needs to be a
constexpr variable, or a non-volatile const-qualified integer, or a reference
http://eel.is/c++draft/expr.const#8.7
>From gcc-bugs-return-616843-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 11:56:51 2018
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From: "miro.kropacek at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/87498] New: Inconsistent behaviour for passing -DNO_ASM and host=none
Date: Wed, 03 Oct 2018 11:56:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87498
Bug ID: 87498
Summary: Inconsistent behaviour for passing -DNO_ASM and
host=none
Product: gcc
Version: 7.3.0
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While testing recent 7.3.0 on m68k I have noticed an inconsistency when it
comes to enabling/disabling assemly routines for gmp.
Commit 4b2246ef8ab1687ade4dfeaa82b1da3934e74213 introduces passing -DNO_ASM to
avoid building in-tree version of GMP with assembly inlines (due to safety
reasons). That's good.
However what I don't understand is the behaviour happening during the canadian
cross - in my case where build=x86_64 and host=target=m68k.
For x86_64's gmp, host is passed as "none-pc-linux-gnu", thus disabling
assembly and passing -DNO_ASM to CFLAGS from gmp's configure (making the
toplevel AM_CFLAGS useless).
For m68k's gmp, host is passed as "m68k-elf", thus not disabling assembly and
passing -DNO_ASM from toplevel AM_CFLAGS. This leads to an inconsistent state
because some asm routines (files) are still used in GMP however inlines are
disabled due to NO_ASM.
I assume that in the m68k case, some check determines that m68k-gcc cross
compiler is outside the build tree (what is) and decides to pass true host id.
What is fine with me but in that case AM_CFLAGS's -DNO_ASM shouldn't be passed
along.
>From gcc-bugs-return-616844-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 12:03:39 2018
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Subject: [Bug lto/87499] New: error: invalid conversion in gimple call for a nested function with lto
Date: Wed, 03 Oct 2018 12:03:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87499
Bug ID: 87499
Summary: error: invalid conversion in gimple call for a nested
function with lto
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
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Very old issue:
$ gcc /home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/nested-func-9.c -flto
-fchecking
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/nested-func-9.c: In function
‘fn2’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/nested-func-9.c:20:3: error:
invalid conversion in gimple call
fn2 (void)
^
struct S
struct S
# .MEM_12 = VDEF <.MEM_11(D)>
<retval> = fn (); [static-chain: CHAIN.7_4(D)] [return slot optimization]
/home/marxin/Programming/gcc/gcc/testsuite/gcc.dg/nested-func-9.c:20: confused
by earlier errors, bailing out
lto-wrapper: fatal error: gcc returned 1 exit status
compilation terminated.
/usr/lib64/gcc/x86_64-suse-linux/8/../../../../x86_64-suse-linux/bin/ld: error:
lto-wrapper failed
collect2: error: ld returned 1 exit status
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Subject: [Bug libstdc++/71430] Consider having different global std::locale object per thread
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Last reconfirmed| |2018-10-03
Ever confirmed|0 |1
>From gcc-bugs-return-616846-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 12:10:32 2018
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Subject: [Bug libstdc++/59439] std::locale uses atomic instructions on construction
Date: Wed, 03 Oct 2018 12:10:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59439
--- Comment #14 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The testcase now scales with the number of CPUs, instead of running effectively
single-threaded.
If the global locale is changed so std::locale() != std::locale::classic() then
every thread contends for the reference count on the global locale again. That
would be mitigated by PR 71430.
>From gcc-bugs-return-616847-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 12:13:45 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug lto/87500] New: ICE in discriminator_for_local_entity, at cp/mangle.c:1967
Date: Wed, 03 Oct 2018 12:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87500
Bug ID: 87500
Summary: ICE in discriminator_for_local_entity, at
cp/mangle.c:1967
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Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: hubicka at gcc dot gnu.org, jakub at gcc dot gnu.org,
marxin at gcc dot gnu.org
Target Milestone: ---
It's old ICE:
$ cat ice.ii
template <typename> struct a {
void b() {
a c;
int d;
#pragma omp declare reduction(+ : a : 9)
#pragma omp parallel reduction(+ : c)
d++;
}
};
main() {
a<double> c;
c.b();
}
$ g++ ice.ii -flto -fopenmp -c
ice.ii:10:6: warning: ISO C++ forbids declaration of ‘main’ with no type
[-Wreturn-type]
10 | main() {
| ^
during IPA pass: *free_lang_data
ice.ii: In instantiation of ‘void omp declare reduction operator+(a<
<template-parameter-1-1> >&) [with <template-parameter-1-1> = double]’:
ice.ii:5:9: required from here
ice.ii:5:9: internal compiler error: in discriminator_for_local_entity, at
cp/mangle.c:1967
5 | #pragma omp declare reduction(+ : a : 9)
| ^~~
0x909f04 discriminator_for_local_entity
/home/marxin/Programming/gcc/gcc/cp/mangle.c:1967
0x909f04 write_local_name
/home/marxin/Programming/gcc/gcc/cp/mangle.c:2065
0x909f04 write_name
/home/marxin/Programming/gcc/gcc/cp/mangle.c:964
0x909486 write_encoding
/home/marxin/Programming/gcc/gcc/cp/mangle.c:825
0x9134a4 mangle_decl_string
/home/marxin/Programming/gcc/gcc/cp/mangle.c:3795
0x9139c0 get_mangled_id
/home/marxin/Programming/gcc/gcc/cp/mangle.c:3817
0x9139c0 mangle_decl(tree_node*)
/home/marxin/Programming/gcc/gcc/cp/mangle.c:3855
0x117722d decl_assembler_name(tree_node*)
/home/marxin/Programming/gcc/gcc/tree.c:691
0x11974fa assign_assembler_name_if_needed(tree_node*)
/home/marxin/Programming/gcc/gcc/tree.c:5791
0x1199410 free_lang_data_in_cgraph
/home/marxin/Programming/gcc/gcc/tree.c:5840
0x1199410 free_lang_data
/home/marxin/Programming/gcc/gcc/tree.c:5881
0x1199410 execute
/home/marxin/Programming/gcc/gcc/tree.c:5934
>From gcc-bugs-return-616848-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 12:39:31 2018
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From: "schwab@linux-m68k.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/70149] [F08] Character pointer initialization causes ICE
Date: Wed, 03 Oct 2018 12:39:00 -0000
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--- Comment #9 from Andreas Schwab <schwab@linux-m68k.org> ---
This generates wrong code on powerpc64, either the initializer or the size of
_F.myptr_mod_MOD_number_string is wrong.
.globl _F.myptr_mod_MOD_number_string
.align 3
.type _F.myptr_mod_MOD_number_string, @object
.size _F.myptr_mod_MOD_number_string, 8
_F.myptr_mod_MOD_number_string:
.long 16
.zero 4
...
addis 9,2,_F.myptr_mod_MOD_number_string@toc@ha
addi 9,9,_F.myptr_mod_MOD_number_string@toc@l
ld 9,0(9)
extsw 9,9
cmpwi 7,9,16
>From gcc-bugs-return-616849-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 12:44:37 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/87501] New: lto1: error: Alias and target's section differs
Date: Wed, 03 Oct 2018 12:44:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87501
Bug ID: 87501
Summary: lto1: error: Alias and target's section differs
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: hubicka at gcc dot gnu.org, marxin at gcc dot gnu.org
Target Milestone: ---
It's also an older issue:
$ cat 1.ii
struct a {
virtual void f();
};
struct b : a {};
struct S : a, b {
void f() {}
};
main() { S c; }
$ cat 2.ii
struct S {
void f();
};
void S::f() {}
$ g++ -flto 1.ii 2.ii -fchecking
1.ii:5:8: warning: direct base ‘a’ inaccessible in ‘S’ due to ambiguity
struct S : a, b {
^
1.ii:8:6: warning: ISO C++ forbids declaration of ‘main’ with no type
[-Wreturn-type]
main() { S c; }
^
1.ii:5:8: warning: type ‘struct S’ violates the C++ One Definition Rule [-Wodr]
struct S : a, b {
^
2.ii:1:8: note: a type with different bases is defined in another translation
unit
struct S {
^
1.ii:6:8: warning: ‘f’ violates the C++ One Definition Rule [-Wodr]
void f() {}
^
2.ii:4:6: note: implicit this pointer type mismatch
void S::f() {}
^
2.ii:1:8: note: type ‘struct S’ itself violates the C++ One Definition Rule
struct S {
^
1.ii:5:8: note: the incompatible type is defined here
struct S : a, b {
^
2.ii:4:6: note: ‘f’ was previously declared here
void S::f() {}
^
2.ii:4:6: note: code may be misoptimized unless -fno-strict-aliasing is used
lto1: error: Alias and target's section differs
_ZN1S1fEv/26 (f) @0x7ffff657c5c0
Type: function definition analyzed
Visibility: force_output externally_visible no_reorder prevailing_def_ironly
public
Address is taken.
References:
Referring: *.LTHUNK0/1 (alias)_ZTV1S/13 (addr)
Read from file: /tmp/ccaPfjxk.o
First run: 0
Function flags:
Called by:
Calls:
lto1: error: Alias and target's comdat groups differs
_ZN1S1fEv/26 (f) @0x7ffff657c5c0
Type: function definition analyzed
Visibility: force_output externally_visible no_reorder prevailing_def_ironly
public
Address is taken.
References:
Referring: *.LTHUNK0/1 (alias)_ZTV1S/13 (addr)
Read from file: /tmp/ccaPfjxk.o
First run: 0
Function flags:
Called by:
Calls:
*.LTHUNK0/1 (*.LTHUNK0) @0x7ffff657c170
Type: function definition analyzed alias
Visibility: comdat_group:_ZN1S1fEv section:.text._ZN1S1fEv (implicit_section)
artificial
Same comdat group as: _ZThn8_N1S1fEv/2
References: _ZN1S1fEv/26 (alias)
Referring:
Read from file: /tmp/ccF6bEVE.o
First run: 0
Function flags:
Called by: _ZThn8_N1S1fEv/2 (can throw external)
Calls:
(null):0: confused by earlier errors, bailing out
lto-wrapper: fatal error: g++ returned 1 exit status
compilation terminated.
/usr/lib64/gcc/x86_64-suse-linux/8/../../../../x86_64-suse-linux/bin/ld: error:
lto-wrapper failed
collect2: error: ld returned 1 exit status
>From gcc-bugs-return-616850-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 12:47:27 2018
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Subject: [Bug c++/87494] hidden visibility constexpr variables left unevaluated
Date: Wed, 03 Oct 2018 12:47:00 -0000
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Nathan Froyd <froydnj at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-03
Ever confirmed|0 |1
--- Comment #1 from Nathan Froyd <froydnj at gcc dot gnu.org> ---
Giving gGkAtoms default visibility also works to make the bug go away.
>From gcc-bugs-return-616851-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 13:20:45 2018
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Subject: [Bug c/87483] attribute alias accepted on a symbol definition
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-10-03
Target Milestone|--- |9.0
Ever confirmed|0 |1
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
I've got patch candidate.
>From gcc-bugs-return-616852-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 13:30:55 2018
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Subject: [Bug target/86592] [9 regression] gcc.target/powerpc/p8-vec-xl-xst-v2.c fails starting with r261510
Date: Wed, 03 Oct 2018 13:30:00 -0000
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--- Comment #4 from seurer at gcc dot gnu.org ---
It looks like it is fixed.
>From gcc-bugs-return-616853-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 13:33:32 2018
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Subject: [Bug gcov-profile/77698] Unrolled loop not considered hot after profiling
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Should be fixed since r264462, not planning to backport that.
>From gcc-bugs-return-616854-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 13:34:36 2018
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Subject: [Bug c++/52477] Wrong initialization order? __attribute__((constructor)) vs static data access
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|marxin at gcc dot gnu.org |unassigned at gcc dot gnu.org
--- Comment #16 from Martin Liška <marxin at gcc dot gnu.org> ---
Leaving for now..
>From gcc-bugs-return-616855-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 13:40:48 2018
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From: "aleksey.covacevice at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libstdc++/87493] chrono::system_clock unusable with std::tm due to misaligned precisions
Date: Wed, 03 Oct 2018 13:40:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87493
Aleksey Covacevice <aleksey.covacevice at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |aleksey.covacevice at gmail dot co
| |m
--- Comment #3 from Aleksey Covacevice <aleksey.covacevice at gmail dot com> ---
VinÃcius:
I couldn't reproduce the issue at hand. I've tested a number of `std::tm`
combinations manually, and also checked through all `time_t` values from
`INT_MIN` to `INT_MAX` without any failures.
Could you provide a sample input for which the assertion fails?
Recall that, from POSIX, `tm.tm_year` is supposed to be a number counted from
1900. Mistakenly inputting larger values will silently overflow things along
the way.
>From gcc-bugs-return-616856-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 13:46:53 2018
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From: "paul.richard.thomas at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/70149] [F08] Character pointer initialization causes ICE
Date: Wed, 03 Oct 2018 13:46:00 -0000
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--- Comment #10 from paul.richard.thomas at gmail dot com <paul.richard.thomas at gmail dot com> ---
Thanks Andreas,
I am clearly not casting the initializer correctly. I'll try to figure
out what is correct tomorrow.
Best regards
Paul
On Wed, 3 Oct 2018 at 13:39, schwab@linux-m68k.org
<gcc-bugzilla@gcc.gnu.org> wrote:
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70149
>
> --- Comment #9 from Andreas Schwab <schwab@linux-m68k.org> ---
> This generates wrong code on powerpc64, either the initializer or the size of
> _F.myptr_mod_MOD_number_string is wrong.
>
> .globl _F.myptr_mod_MOD_number_string
> .align 3
> .type _F.myptr_mod_MOD_number_string, @object
> .size _F.myptr_mod_MOD_number_string, 8
> _F.myptr_mod_MOD_number_string:
> .long 16
> .zero 4
> ...
> addis 9,2,_F.myptr_mod_MOD_number_string@toc@ha
> addi 9,9,_F.myptr_mod_MOD_number_string@toc@l
> ld 9,0(9)
> extsw 9,9
> cmpwi 7,9,16
>
> --
> You are receiving this mail because:
> You are on the CC list for the bug.
> You are the assignee for the bug.
>From gcc-bugs-return-616857-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 13:51:10 2018
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Subject: [Bug target/87156] [9 Regression] ICE building libstdc++ for mips64
Date: Wed, 03 Oct 2018 13:51:00 -0000
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--- Comment #5 from Thomas Preud'homme <thopre01 at gcc dot gnu.org> ---
(In reply to Paul Hua from comment #4)
> (In reply to Jan Hubicka from comment #3)
> > Does the attached patch fix the bootstrap?
> > Index: cgraphclones.c
> > ===================================================================
> > --- cgraphclones.c (revision 264180)
> > +++ cgraphclones.c (working copy)
> > @@ -967,6 +967,8 @@ cgraph_node::create_version_clone_with_b
> > SET_DECL_ASSEMBLER_NAME (new_decl, DECL_NAME (new_decl));
> > SET_DECL_RTL (new_decl, NULL);
> >
> > + DECL_VIRTUAL_P (new_decl) = 0;
> > +
> > /* When the old decl was a con-/destructor make sure the clone isn't. */
> > DECL_STATIC_CONSTRUCTOR (new_decl) = 0;
> > DECL_STATIC_DESTRUCTOR (new_decl) = 0;
>
> Yes, fixed. Thanks.
Likewise for me on gcc23.
>From gcc-bugs-return-616858-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 13:59:14 2018
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Subject: [Bug bootstrap/87498] Inconsistent behaviour for passing -DNO_ASM and host=none
Date: Wed, 03 Oct 2018 13:59:00 -0000
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--- Comment #1 from Miro Kropacek <miro.kropacek at gmail dot com> ---
> For x86_64's gmp, host is passed as "none-pc-linux-gnu", thus disabling assembly and passing -DNO_ASM to CFLAGS from gmp's configure (making the toplevel AM_CFLAGS useless).
I must correct myself here - the fact gmp's CFLAGS contain -DNO_ASM means
nothing here as CFLAGS is overriden by AM_CFLAGS.
So the question / issue remains why AM_CFLAGS always pass -DNO_ASM but in m68k
case do not use "none" as the host.
>From gcc-bugs-return-616859-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 14:34:29 2018
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Subject: [Bug c++/87502] New: Poor code generation for std::string("c-style string")
Date: Wed, 03 Oct 2018 14:34:00 -0000
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Bug ID: 87502
Summary: Poor code generation for std::string("c-style string")
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: terra at gnome dot org
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Created attachment 44776
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44776&action=edit
Preprocessed source code
It appears that gcc is creating quite poor code when "c-style strings"
are used to construct std::string objects. Ideally, the result ought
to be just a few move instructions for small strings.
Host: Linux x86_64 4.4.140-62-default (OpenSuSE)
Test code:
---------------------------------------------------------------
#include <string>
extern void foo (const std::string &);
void
bar ()
{
foo ("abc");
foo (std::string("abc"));
}
---------------------------------------------------------------
# /usr/local/products/gcc/8.2.0/bin/g++ -std=gnu++1z -S -m32 -O3 ttt.C
# grep 'call.*construct' ttt.s
call
_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE12_M_constructIPKcEEvT_S8_St20forward_iterator_tag.constprop.18
call
_ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE12_M_constructIPKcEEvT_S8_St20forward_iterator_tag.constprop.18
Here gcc generates complete calls to the generic string construction
even though the strings are constructed from small, known strings.
"-std=gnu++1z" is important; "-m32" and "-O3" (as opposed to "-m64" and
"-O2") are not.
# /usr/local/products/gcc/8.2.0/bin/g++ -S -m32 -O3 ttt.C
# grep 'call.*construct' ttt.s
# (nada)
No calls -- good. In this case gcc generates this fragment:
_Z3barv:
.LFB1084:
.cfi_startproc
.cfi_personality 0,__gxx_personality_v0
.cfi_lsda 0,.LLSDA1084
pushl %ebp
.cfi_def_cfa_offset 8
.cfi_offset 5, -8
movl $25185, %edx
movl %esp, %ebp
.cfi_def_cfa_register 5
pushl %edi
pushl %esi
.cfi_offset 7, -12
.cfi_offset 6, -16
leal -48(%ebp), %esi
pushl %ebx
.cfi_offset 3, -20
leal -40(%ebp), %ebx
subl $56, %esp
movl %ebx, -48(%ebp)
pushl %esi
movw %dx, -40(%ebp)
movb $99, -38(%ebp)
movl $3, -44(%ebp)
movb $0, -37(%ebp)
.LEHB6:
.cfi_escape 0x2e,0x10
call _Z3fooRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE
[...]
This is better than a call, but not great:
1. The string is moved into position in three chunks (25185, 99, 0).
This probably comes from inlined memcpy of 3 bytes, but the source
is zero-terminated so rounding the memcpy size up to 4 would have
been better.
2. It's unclear why 25185 is passed through a register.
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hOaOqOiNkOmCruS7tu+8jOivt+eCueWHu+i/memHjOmAgOiuog=>From gcc-bugs-return-616861-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 14:49:16 2018
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From: "chtz at informatik dot uni-bremen.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87503] New: Spurious -Wunused-but-set-variable warning in template function
Date: Wed, 03 Oct 2018 14:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87503
Bug ID: 87503
Summary: Spurious -Wunused-but-set-variable warning in template
function
Product: gcc
Version: 8.1.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: chtz at informatik dot uni-bremen.de
Target Milestone: ---
Using g++ 8.1.0 and compiling the following minimal example with -Wall
template<class Index, bool flag>
Index bar(Index rows, Index cols) {
const bool left = flag;
Index x = left ? rows : cols;
return x;
}
int main() {
return bar<int, true>(1,2);
}
I'm getting this:
warning: variable ‘left’ set but not used [-Wunused-but-set-variable]
This works fine with g++-7.3 (or earlier) and seems to be fixed in 8.2.0 (I
don't have easy access to 8.1.1. If it has been fixed there already, apologies
for the noise)
Maybe related issue: Bug 85827
>From gcc-bugs-return-616862-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 15:36:52 2018
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87504] New: inconsistent diagnostic style between C and C++
Date: Wed, 03 Oct 2018 15:36:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87504
Bug ID: 87504
Summary: inconsistent diagnostic style between C and C++
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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I noticed an improvement in the diagnostic GCC issues for the following test
case (where I made a typo in the first argument to strlnen: a&a[v0]).
$ cat c.c && gcc -O2 -S -fdump-tree-optimized=/dev/stdout c.c
const char a[] = "12345";
int v0 = 0;
int f (unsigned n)
{
if (n < 6)
n = 6;
return __builtin_strnlen (a&a[v0], n);
}
c.c: In function ‘f’:
c.c:10:30: error: invalid operands to binary & (have ‘const char *’ and ‘int’)
10 | return __builtin_strnlen (a&a[v0], n);
| ~^~~~~~
| | |
| | char
| const char *
But when testing the same code with G++ I also noticed the message is slightly
different:
c.c: In function ‘int f(unsigned int)’:
c.c:10:30: error: invalid operands of types ‘const char [6]’ and ‘const char’
to binary ‘operator&’
10 | return __builtin_strnlen (a&a[v0], n);
| ~^~~~~~
It would be nice to converge on the same format and phrasing of the diagnostic
between the two languages.
FWIW, although I like how the C message distinguishes the operands from the
operator using different colors rendering each of the operands in its own color
seems somewhat distracting (it raises the question: do the colors suggest some
subtlety of the error that's not captured in the text?) I also find the C++
phrasing more readable than the C style with the "(have ‘const char *’ and
‘int’)".
>From gcc-bugs-return-616863-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 16:19:52 2018
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From: "hiraditya at msn dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87505] New: Vectorizer generates a lot of code for a small loop
Date: Wed, 03 Oct 2018 16:19:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87505
Bug ID: 87505
Summary: Vectorizer generates a lot of code for a small loop
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: hiraditya at msn dot com
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test.cpp
#include <cstdint>
int bar(int* v, std::size_t base) {
int sum = 0;
for (int i = base; i < base + 4; ++i) {
sum += v[i];
}
return sum;
}
$ gcc-8.2 -std=c++17 -O3 -DNDEBUG test.cpp
bar(int*, unsigned long):
movslq %esi, %rcx
leaq 4(%rsi), %r8
movl %esi, %edx
cmpq %r8, %rcx
jnb .L7
leaq 3(%rsi), %rax
movq %r8, %r9
subq %rcx, %rax
subq %rcx, %r9
cmpq $3, %rax
jbe .L8
movq %r9, %rdx
leaq (%rdi,%rcx,4), %rax
pxor %xmm0, %xmm0
shrq $2, %rdx
salq $4, %rdx
addq %rax, %rdx
.L5:
movdqu (%rax), %xmm2
addq $16, %rax
paddd %xmm2, %xmm0
cmpq %rdx, %rax
jne .L5
movdqa %xmm0, %xmm1
movq %r9, %r10
psrldq $8, %xmm1
andq $-4, %r10
paddd %xmm1, %xmm0
addq %r10, %rcx
leal (%rsi,%r10), %edx
movdqa %xmm0, %xmm1
psrldq $4, %xmm1
paddd %xmm1, %xmm0
movd %xmm0, %eax
cmpq %r10, %r9
je .L10
.L3:
addl (%rdi,%rcx,4), %eax
leal 1(%rdx), %ecx
movslq %ecx, %rcx
cmpq %r8, %rcx
jnb .L1
addl (%rdi,%rcx,4), %eax
leal 2(%rdx), %ecx
movslq %ecx, %rcx
cmpq %rcx, %r8
jbe .L1
addl $3, %edx
addl (%rdi,%rcx,4), %eax
movslq %edx, %rdx
cmpq %rdx, %r8
jbe .L1
addl (%rdi,%rdx,4), %eax
ret
.L7:
xorl %eax, %eax
.L1:
ret
.L10:
ret
.L8:
xorl %eax, %eax
jmp .L3
>From gcc-bugs-return-616864-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 16:50:55 2018
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From: "amonakov at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/87505] Vectorizer generates a lot of code for a small loop
Date: Wed, 03 Oct 2018 16:50:00 -0000
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Alexander Monakov <amonakov at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |amonakov at gcc dot gnu.org
--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
This is because 'i' is int while 'base' is size_t. Loop init expression 'int i
= base' truncates base to 32 bits, and loop condition first converts i to
size_t and then compares in that unsigned type. It's not exactly obvious how
many iterations this loop has :)
Using the proper type for 'i' results in reasonable code.
Perhaps in principle niter analysis could handle this anyway?
>From gcc-bugs-return-616865-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 16:52:06 2018
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From: "kelvin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/87434] LTO corrupts code
Date: Wed, 03 Oct 2018 16:52:00 -0000
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kelvin at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #3 from kelvin at gcc dot gnu.org ---
I have confirmed that the cause of this problem was an error in my draft patch.
Thanks for comments that helped motivate me to look deeper.
>From gcc-bugs-return-616866-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 16:55:43 2018
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Subject: [Bug libgcc/85334] Shadow stack isn't unwound properly through signal handler
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85334
--- Comment #7 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Wed Oct 3 16:55:06 2018
New Revision: 264814
URL: https://gcc.gnu.org/viewcvs?rev=264814&root=gcc&view=rev
Log:
i386: Remove _Unwind_Frames_Increment
CET kernel has been changed to place a restore token on shadow stack for
signal handler to enhance security. It is usually transparent to user
programs since kernel will pop the restore token when signal handler
returns. But when an exception is thrown from a signal handler, now
we need to remove _Unwind_Frames_Increment to pop the the restore token
from shadow stack. Otherwise, we get
FAIL: g++.dg/torture/pr85334.C -O0 execution test
FAIL: g++.dg/torture/pr85334.C -O1 execution test
FAIL: g++.dg/torture/pr85334.C -O2 execution test
FAIL: g++.dg/torture/pr85334.C -O3 -g execution test
FAIL: g++.dg/torture/pr85334.C -Os execution test
FAIL: g++.dg/torture/pr85334.C -O2 -flto -fno-use-linker-plugin
-flto-partition=none execution test
Backport from mainline
2018-07-27 H.J. Lu <hongjiu.lu@intel.com>
PR libgcc/85334
* config/i386/shadow-stack-unwind.h (_Unwind_Frames_Increment):
Removed.
Modified:
branches/gcc-8-branch/libgcc/ChangeLog
branches/gcc-8-branch/libgcc/config/i386/shadow-stack-unwind.h
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Subject: [Bug target/81652] [meta-bug] -fcf-protection=full bugs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81652
Bug 81652 depends on bug 85334, which changed state.
Bug 85334 Summary: Shadow stack isn't unwound properly through signal handler
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85334
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |FIXED
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Subject: [Bug libgcc/85334] Shadow stack isn't unwound properly through signal handler
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85334
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|REOPENED |RESOLVED
Resolution|--- |FIXED
Target Milestone|8.0 |8.3
--- Comment #8 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for GCC 9 and GCC 8.3
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Subject: [Bug tree-optimization/87415] [9 Regression] wrong code at -O1 and above on x86_64-linux-gnu
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--- Comment #4 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Fixed in trunk.
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Subject: [Bug tree-optimization/87415] [9 Regression] wrong code at -O1 and above on x86_64-linux-gnu
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87415
--- Comment #5 from Aldy Hernandez <aldyh at gcc dot gnu.org> ---
Author: aldyh
Date: Wed Oct 3 17:36:29 2018
New Revision: 264817
URL: https://gcc.gnu.org/viewcvs?rev=264817&root=gcc&view=rev
Log:
PR tree-optimization/87415
* tree-vrp.c (set_value_range_with_overflow): Special case one bit
precision fields.
Added:
trunk/gcc/testsuite/gcc.dg/pr87415.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/tree-vrp.c
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Subject: [Bug tree-optimization/87490] [9 Regression] ICE in expand_builtin_strnlen at gcc/builtins.c:3164
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Martin Sebor <msebor at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
--- Comment #4 from Martin Sebor <msebor at gcc dot gnu.org> ---
Patch: https://gcc.gnu.org/ml/gcc-patches/2018-10/msg00197.html
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From: "patrick.a.moran at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87506] New: ICE with inherited constexpr constructor with const argument
Date: Wed, 03 Oct 2018 18:23:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87506
Bug ID: 87506
Summary: ICE with inherited constexpr constructor with const
argument
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: patrick.a.moran at gmail dot com
Target Milestone: ---
Created attachment 44777
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44777&action=edit
A reproduction of the issue described
I've attached what I believe is a minimal reproduction. It can be built with
> gcc --std=c++14 -c ice_repro.cpp
* It reproduces with g++ 8.2.0 (I've confirmed it does not occur with 7.3.0)
* It reproduces with a --std= of c++11, c++14, c++17, c++1z and c++2a
* It uses constexpr, so it fails for uninterested reasons below C++11
* No other command-line flags are needed
* And I've not found any that cause the failure not to reproduce.
* I found this on a Linux box (Ubuntu 14.04.1), but the gcc was built from
source and no headers are included in the reproduction.
The failure mode is an internal compiler error (full error message at the
bottom). Changing any of the following will cause the failure not to happen:
* If you drop the constexpr from B::B(A)
* If you change "constexpr B(const A) {}" to "constexpr B(A) {}"
* If you use a built-in type like int as the tag argument instead of the
struct A
* If you change the argument to B::B(A) to be any reference category
The full error message is:
> ice_repro.cpp: In function ‘void func()’:
> ice_repro.cpp:8:24: in ‘constexpr’ expansion of ‘obj.C::C((A{}, A()))’
> ice_repro.cpp:8:24: internal compiler error: in adjust_temp_type, at cp/constexpr.c:1255
> void func() { C obj(A{}); }
> ^
> 0x58c00e adjust_temp_type
> ../../gcc-8.2.0/gcc/cp/constexpr.c:1255
> 0x5ee55b cxx_bind_parameters_in_call
> ../../gcc-8.2.0/gcc/cp/constexpr.c:1330
> 0x5ee55b cxx_eval_call_expression
> ../../gcc-8.2.0/gcc/cp/constexpr.c:1602
> 0x5f08c4 cxx_eval_constant_expression
> ../../gcc-8.2.0/gcc/cp/constexpr.c:4211
> 0x5ef958 cxx_eval_constant_expression
> ../../gcc-8.2.0/gcc/cp/constexpr.c:4337
> 0x5ef958 cxx_eval_constant_expression
> ../../gcc-8.2.0/gcc/cp/constexpr.c:4337
> 0x5f01d5 cxx_eval_constant_expression
> ../../gcc-8.2.0/gcc/cp/constexpr.c:4689
> 0x5eef24 cxx_eval_call_expression
> ../../gcc-8.2.0/gcc/cp/constexpr.c:1709
> 0x5f08c4 cxx_eval_constant_expression
> ../../gcc-8.2.0/gcc/cp/constexpr.c:4211
> 0x5f39c9 cxx_eval_outermost_constant_expr
> ../../gcc-8.2.0/gcc/cp/constexpr.c:4861
> 0x5f5ad8 maybe_constant_init_1
> ../../gcc-8.2.0/gcc/cp/constexpr.c:5187
> 0x64105c expand_default_init
> ../../gcc-8.2.0/gcc/cp/init.c:1918
> 0x64105c expand_aggr_init_1
> ../../gcc-8.2.0/gcc/cp/init.c:2021
> 0x64143b build_aggr_init(tree_node*, tree_node*, int, int)
> ../../gcc-8.2.0/gcc/cp/init.c:1761
> 0x60fb07 build_aggr_init_full_exprs
> ../../gcc-8.2.0/gcc/cp/decl.c:6283
> 0x60fb07 check_initializer
> ../../gcc-8.2.0/gcc/cp/decl.c:6432
> 0x61e62b cp_finish_decl(tree_node*, tree_node*, bool, tree_node*, int)
> ../../gcc-8.2.0/gcc/cp/decl.c:7145
> 0x697710 cp_parser_init_declarator
> ../../gcc-8.2.0/gcc/cp/parser.c:19749
> 0x69e488 cp_parser_simple_declaration
> ../../gcc-8.2.0/gcc/cp/parser.c:13052
> 0x69f218 cp_parser_block_declaration
> ../../gcc-8.2.0/gcc/cp/parser.c:12871
> Please submit a full bug report,
> with preprocessed source if appropriate.
> Please include the complete backtrace with any bug report.
> See <https://gcc.gnu.org/bugs/> for instructions.
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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87507] New: IRA unnecessarily uses non-volatile registers during register assignment
Date: Wed, 03 Oct 2018 18:25:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87507
Bug ID: 87507
Summary: IRA unnecessarily uses non-volatile registers during
register assignment
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
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Current trunk and GCC 7 (haven't tested anything else) unnecessarily use
non-volatile regs forcing unneeded save/restore code, along with unnecessary
reg moves. Using a different 128-bit type (ie, long double, etc.) for the
struct field types, I see the code I would expect to see.
I'm guessing this is a target issue (insn constraints?), so setting the
Component to that for now.
bergner@pike:~$ cat bug.c
typedef struct
{
__int128_t i0;
__int128_t i1;
} i2_t;
void
foo (long cond, i2_t *dst, __int128_t src)
{
if (cond)
{
dst->i0 = src;
dst->i1 = src;
}
}
bergner@pike:~$ .../xgcc -B... -O2 -S bug.c
bergner@pike:~$ cat bug2.s
.file "bug.c"
.abiversion 2
.section ".text"
.align 2
.p2align 4,,15
.globl foo
.type foo, @function
foo:
.LFB0:
.cfi_startproc
cmpdi 7,3,0
beqlr 7
std 30,-16(1)
std 31,-8(1)
.cfi_offset 30, -16
.cfi_offset 31, -8
mr 30,6
mr 31,5
addi 9,4,16
mr 10,30
mr 11,31
std 31,0(4)
std 30,8(4)
std 11,0(9)
std 10,8(9)
ld 30,-16(1)
ld 31,-8(1)
.cfi_restore 31
.cfi_restore 30
blr
.long 0
.byte 0,0,0,0,0,2,0,0
.cfi_endproc
.LFE0:
.size foo,.-foo
.ident "GCC: (GNU) 9.0.0 20181002 (experimental) [trunk revision
264800]"
.section .note.GNU-stack,"",@progbits
>From gcc-bugs-return-616874-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 18:26:57 2018
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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87507] IRA unnecessarily uses non-volatile registers during register assignment
Date: Wed, 03 Oct 2018 18:26:00 -0000
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Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dje at gcc dot gnu.org,
| |segher at gcc dot gnu.org,
| |wschmidt at gcc dot gnu.org
Assignee|unassigned at gcc dot gnu.org |bergner at gcc dot gnu.org
Target Milestone|--- |9.0
--- Comment #1 from Peter Bergner <bergner at gcc dot gnu.org> ---
I'll take a look at what the problem is.
>From gcc-bugs-return-616875-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 18:30:03 2018
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Subject: [Bug target/87507] IRA unnecessarily uses non-volatile registers during register assignment
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Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target| |powerpc64le-linux
--- Comment #2 from Peter Bergner <bergner at gcc dot gnu.org> ---
Seems to work fine on BE, so probably a LE only issue.
>From gcc-bugs-return-616876-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 18:35:01 2018
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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87506] [7/8/9 Regression] ICE with inherited constexpr constructor with const argument
Date: Wed, 03 Oct 2018 18:35:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-03
CC| |mpolacek at gcc dot gnu.org
Target Milestone|--- |7.4
Summary|ICE with inherited |[7/8/9 Regression] ICE with
|constexpr constructor with |inherited constexpr
|const argument |constructor with const
| |argument
Ever confirmed|0 |1
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
commit cbc3b89fda8752ee376db4d75f1fda708becc6a0
Author: nathan <nathan@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Mon Nov 20 14:39:00 2017 +0000
[PR c++/82878] pass-by-invisiref in lambda
https://gcc.gnu.org/ml/gcc-patches/2017-11/msg01115.html
PR c++/82878
PR c++/78495
* call.c (build_call_a): Don't set CALL_FROM_THUNK_P for inherited
ctor.
* cp-gimplify.c (cp_genericize_r): Restore THUNK dereference
inhibibition check removed in previous c++/78495 change.
PR c++/82878
* g++.dg/cpp0x/pr82878.C: New.
* g++.dg/cpp1z/inh-ctor38.C: Check moves too.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@254958
138bc75d-0d04-0410-961f-82ee72b054a4
>From gcc-bugs-return-616877-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 18:41:49 2018
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Subject: [Bug c++/63579] New attribute for empty member optimization
Date: Wed, 03 Oct 2018 18:41:00 -0000
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Marc Glisse <glisse at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
Assignee|unassigned at gcc dot gnu.org |jason at redhat dot com
Target Milestone|--- |9.0
--- Comment #5 from Marc Glisse <glisse at gcc dot gnu.org> ---
Fixed in r264813 .
>From gcc-bugs-return-616878-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 18:41:51 2018
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Subject: [Bug libstdc++/55713] std::tuple<ElementType> incorrectly is convertible to "ElementType" when it is an empty class
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Bug 55713 depends on bug 63579, which changed state.
Bug 63579 Summary: New attribute for empty member optimization
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63579
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |FIXED
>From gcc-bugs-return-616879-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 18:49:25 2018
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Subject: [Bug target/86592] [9 regression] gcc.target/powerpc/p8-vec-xl-xst-v2.c fails starting with r261510
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Bill Schmidt <wschmidt at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
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--- Comment #5 from Bill Schmidt <wschmidt at gcc dot gnu.org> ---
We have it marked fixed in our internal tracker, so yeah, fixed.
>From gcc-bugs-return-616880-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 19:03:38 2018
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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/87507] IRA unnecessarily uses non-volatile registers during register assignment
Date: Wed, 03 Oct 2018 19:03:00 -0000
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--- Comment #3 from Peter Bergner <bergner at gcc dot gnu.org> ---
So the register pair r7,r8 is free to assign to TImode pseudo 126 in
assign_hard_reg(), but its cost is 1000, while the cost of r30,r31 somehow
looks to be zero, so we choose it instead!?!? Not sure how r30,r31 incorrectly
got a cost of zero.
>From gcc-bugs-return-616881-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 19:08:14 2018
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From: "zwilcox at sandia dot gov" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87508] New: unrecognized command line option '-mfloat-gprs=double'
Date: Wed, 03 Oct 2018 19:08:00 -0000
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Bug ID: 87508
Summary: unrecognized command line option '-mfloat-gprs=double'
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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The following -mfloat-gprs=double gives an error saying it is an unrecognized
command.
./powerpc-eabi-gcc -mfloat-gprs=double
powerpc-sandia_8_1_3-eabi-gcc: error: unrecognized command line option
'-mfloat-gprs=double'; did you mean '-ffloat-store'?
powerpc-sandia_8_1_3-eabi-gcc: fatal error: no input files
compilation terminated.
Even though it is still listed in the documentation:
https://gcc.gnu.org/onlinedocs/gcc/PowerPC-SPE-Options.html
It is not listed --target-help even though other PowerPC SPE Options are.
I've tried in both GCC 8.2 and 8.1.
It does work in GCC 7.x, 5.x and 4.x.
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Subject: [Bug target/87508] unrecognized command line option '-mfloat-gprs=double'
Date: Wed, 03 Oct 2018 19:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87508
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
SPE support has been removed from the standard powerpc-eabi target. If you
want/need SPE support, you need to use the powerpc-eabispe target instead.
See https://gcc.gnu.org/gcc-8/changes.html
>From gcc-bugs-return-616883-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 19:23:15 2018
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Subject: [Bug target/87508] unrecognized command line option '-mfloat-gprs=double'
Date: Wed, 03 Oct 2018 19:23:00 -0000
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--- Comment #2 from Zachary Wilcox <zwilcox at sandia dot gov> ---
Thank you sir. I should have checked the changes.
>From gcc-bugs-return-616884-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 19:25:02 2018
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From: "tkoenig at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/56789] Handling of contiguous dummy arguments
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Summary|Wrong code with contiguous |Handling of contiguous
|dummy argument |dummy arguments
--- Comment #13 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
So, this is a diagnostic issue after all.
For the time being, it seems that we could just
not do the pack/unpack and issue an error for the test
case.
We can handle the F2018 stuff later (whatever it turns out to be).
>From gcc-bugs-return-616885-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 19:47:27 2018
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From: "bergner at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/87507] IRA unnecessarily uses non-volatile registers during register assignment
Date: Wed, 03 Oct 2018 19:47:00 -0000
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--- Comment #4 from Peter Bergner <bergner at gcc dot gnu.org> ---
So this seems to be coming from ira-costs.c:ira_tune_allocno_costs()
/* Some targets allow pseudos to be allocated to unaligned sequences
of hard registers. However, selecting an unaligned sequence can
unnecessarily restrict later allocations. So increase the cost of
unaligned hard regs to encourage the use of aligned hard regs. */
{
const int nregs = ira_reg_class_max_nregs[aclass][ALLOCNO_MODE (a)];
if (nregs > 1)
{
ira_allocate_and_set_costs
(&ALLOCNO_HARD_REG_COSTS (a), aclass, ALLOCNO_CLASS_COST (a));
reg_costs = ALLOCNO_HARD_REG_COSTS (a);
for (j = n - 1; j >= 0; j--)
{
regno = ira_non_ordered_class_hard_regs[aclass][j];
if ((regno % nregs) != 0)
{
int index = ira_class_hard_reg_index[aclass][regno];
ira_assert (index != -1);
reg_costs[index] += ALLOCNO_FREQ (a);
}
}
}
}
...which pessimizes odd/even register pairs (like r7,r8) over even/odd register
pairs (like r30,r31), but I think odd/even volatile pairs should still be
cheaper than even/odd non-volatile pairs. So maybe something like:
COST(even/odd volatile) < COST(odd/even volatile) < COST(even/odd
non-volatile) < COST(odd/even non-volatile)
??
>From gcc-bugs-return-616886-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 20:01:15 2018
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Subject: [Bug libstdc++/55713] std::tuple<ElementType> incorrectly is convertible to "ElementType" when it is an empty class
Date: Wed, 03 Oct 2018 20:01:00 -0000
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--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Now that we have [[no_unique_address]] I'll make our std::tuple use it (I think
I have a partial implementation in a local branch, that I couldn't compile when
I started work on it).
I don't plan to work on it until stage 3 though, as this is a bug and so fixing
it is valid for stage 3.
>From gcc-bugs-return-616888-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 20:23:51 2018
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Subject: [Bug c++/85963] [8/9 Regression] false positive "set but not used" warning [-Wunused-but-set-variable]
Date: Wed, 03 Oct 2018 20:23:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |chtz at informatik dot uni-bremen.
| |de
--- Comment #7 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
*** Bug 87503 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-616887-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 20:23:50 2018
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87503] Spurious -Wunused-but-set-variable warning in template function
Date: Wed, 03 Oct 2018 20:23:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of bug 85963.
NOTE 8.2.0 is the bug fix release of the 8. 8.1.1 is only in developmental and
never was a released sources.
*** This bug has been marked as a duplicate of bug 85963 ***
>From gcc-bugs-return-616889-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 20:27:26 2018
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87494] hidden visibility constexpr variables left unevaluated
Date: Wed, 03 Oct 2018 20:27:00 -0000
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--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I don't think this is techincally a bug. It might be a missed optimization but
not a bug. You still need a definition even for constexpr if used outside of a
constexpr usage IIRC.
>From gcc-bugs-return-616890-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 20:39:17 2018
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From: "law at redhat dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/61409] [6 regression] -Wmaybe-uninitialized false-positive with -O2
Date: Wed, 03 Oct 2018 20:39:00 -0000
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--- Comment #31 from Jeffrey A. Law <law at redhat dot com> ---
No, it's marked as a regression against gcc-6. One of two things needs to
happen for this to be closed.
1. Aldy's work would have to be backported to gcc-6.
or
2. gcc-6 goes out of support
I don't think this bug warrants backporting patches to gcc-6. So the path
forward is via #2. gcc-6 will go out of support when gcc-9 releases, which
will most likely happen in the sprint 2019.
>From gcc-bugs-return-616891-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 20:45:57 2018
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From: "katsunori.kumatani at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/84013] wrong __restrict clique with inline asm operand
Date: Wed, 03 Oct 2018 20:45:00 -0000
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--- Comment #5 from Katsunori Kumatani <katsunori.kumatani at gmail dot com> ---
Hi, any news of this for GCC 9? I'm guessing it requires a bit more changes,
hopefully not forgotten though. Currently I'm using a custom patched GCC 8 for
it (and to test plugin behavior with it) but it's not ideal.
>From gcc-bugs-return-616892-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 21:01:59 2018
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Subject: [Bug fortran/56789] Handling of contiguous dummy arguments
Date: Wed, 03 Oct 2018 21:01:00 -0000
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--- Comment #14 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
This would reject the obvious non-contiguous cases.
Index: interface.c
===================================================================
--- interface.c (Revision 264540)
+++ interface.c (Arbeitskopie)
@@ -3297,6 +3297,14 @@ compare_actual_formal (gfc_actual_arglist **ap, gf
return false;
}
+ if (f->sym->attr.contiguous
+ && !gfc_is_simply_contiguous (a->expr, false, true))
+ {
+ gfc_error ("Non-contiguous argument actual argument passed to "
+ "contiguous dummy argument %qs at %L", f->sym->name,
+ &a->expr->where);
+ }
+
/* Find the last array_ref. */
actual_arr_ref = NULL;
if (a->expr->ref)
Index: trans-array.c
===================================================================
--- trans-array.c (Revision 264540)
+++ trans-array.c (Arbeitskopie)
@@ -7862,8 +7862,7 @@ gfc_conv_array_parameter (gfc_se * se, gfc_expr *
gfc_prepend_expr_to_block (&se->post, tmp);
}
- if (g77 || (fsym && fsym->attr.contiguous
- && !gfc_is_simply_contiguous (expr, false, true)))
+ if (g77)
{
tree origptr = NULL_TREE;
>From gcc-bugs-return-616893-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 21:13:52 2018
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Subject: [Bug fortran/56789] Handling of contiguous dummy arguments
Date: Wed, 03 Oct 2018 21:13:00 -0000
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--- Comment #15 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Of course, there should be a "return false;" in there as well.
>From gcc-bugs-return-616894-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 21:16:10 2018
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From: "paul.richard.thomas at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/56789] Handling of contiguous dummy arguments
Date: Wed, 03 Oct 2018 21:16:00 -0000
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--- Comment #16 from paul.richard.thomas at gmail dot com <paul.richard.thomas at gmail dot com> ---
Hi Thomas,
I think that the copy in/copy out might be rather easy to arrange.
Give me a couple of days.
Paul
On Wed, 3 Oct 2018 at 22:01, tkoenig at gcc dot gnu.org
<gcc-bugzilla@gcc.gnu.org> wrote:
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56789
>
> --- Comment #14 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
> This would reject the obvious non-contiguous cases.
>
> Index: interface.c
> ===================================================================
> --- interface.c (Revision 264540)
> +++ interface.c (Arbeitskopie)
> @@ -3297,6 +3297,14 @@ compare_actual_formal (gfc_actual_arglist **ap, gf
> return false;
> }
>
> + if (f->sym->attr.contiguous
> + && !gfc_is_simply_contiguous (a->expr, false, true))
> + {
> + gfc_error ("Non-contiguous argument actual argument passed to "
> + "contiguous dummy argument %qs at %L", f->sym->name,
> + &a->expr->where);
> + }
> +
> /* Find the last array_ref. */
> actual_arr_ref = NULL;
> if (a->expr->ref)
> Index: trans-array.c
> ===================================================================
> --- trans-array.c (Revision 264540)
> +++ trans-array.c (Arbeitskopie)
> @@ -7862,8 +7862,7 @@ gfc_conv_array_parameter (gfc_se * se, gfc_expr *
> gfc_prepend_expr_to_block (&se->post, tmp);
> }
>
> - if (g77 || (fsym && fsym->attr.contiguous
> - && !gfc_is_simply_contiguous (expr, false, true)))
> + if (g77)
> {
> tree origptr = NULL_TREE;
>
> --
> You are receiving this mail because:
> You are on the CC list for the bug.
>From gcc-bugs-return-616895-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 22:55:44 2018
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Subject: [Bug libstdc++/63776] [C++11] Regex collate matching not working
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--- Comment #12 from Tim Shen <timshen at gcc dot gnu.org> ---
I'm not sure anymore about the meaning of pinging back end (my bad), but
> But this is (assuming wchar_t uses a unicode encoding):
The two pieces of code looks identical to me. :)
>From gcc-bugs-return-616896-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Wed Oct 03 22:59:21 2018
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Subject: [Bug libstdc++/63776] [C++11] Regex collate matching not working
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--- Comment #13 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Oops, paste fail. The second one should be:
#include <regex>
#include <cassert>
int main()
{
std::locale::global(std::locale("en_US.UTF-8"));
std::wstring s = L"joão méroço";
std::wregex r{L"[[:alpha:]]{4} [[:alpha:]]{6}"};
assert( regex_match(s, r) );
}
>From gcc-bugs-return-616897-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 01:36:37 2018
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Subject: [Bug libstdc++/87493] chrono::system_clock unusable with std::tm due to misaligned precisions
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VinÃcius dos Santos Oliveira <vini.ipsmaker at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |INVALID
--- Comment #4 from VinÃcius dos Santos Oliveira <vini.ipsmaker at gmail dot com> ---
>Recall that, from POSIX, `tm.tm_year` is supposed to be a number counted from 1900.
Oh, I made this mistake. `std::chrono::system_clock` precision is probably
enough. Thanks. Closing.
>From gcc-bugs-return-616898-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 01:40:23 2018
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Subject: [Bug rtl-optimization/87507] IRA unnecessarily uses non-volatile registers during register assignment
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Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2018-10-04
CC| |law at gcc dot gnu.org,
| |vmakarov at gcc dot gnu.org
Component|target |rtl-optimization
Ever confirmed|0 |1
--- Comment #5 from Peter Bergner <bergner at gcc dot gnu.org> ---
The other problem is that we don't add in the cost of saving and restoring
non-volatile registers in the prologue and epilogue if HONOR_REG_ALLOC_ORDER is
set (it is for rs6000):
if (!HONOR_REG_ALLOC_ORDER)
{
if ((saved_nregs = calculate_saved_nregs (hard_regno, mode)) != 0)
/* We need to save/restore the hard register in
epilogue/prologue. Therefore we increase the cost. */
{
rclass = REGNO_REG_CLASS (hard_regno);
add_cost = ((ira_memory_move_cost[mode][rclass][0]
+ ira_memory_move_cost[mode][rclass][1])
* saved_nregs / hard_regno_nregs (hard_regno,
mode) - 1);
cost += add_cost;
full_cost += add_cost;
}
}
The code in Comment 4 is what gives reg pair r7,r8 a cost of 1000 and since we
don't charge non-volatiles for prologue/epilogue save restore, reg pair r30,r31
gets a cost of zero, so assign_hard_reg picks r30,r31 and we get the
unnecessary non-volatile reg usage we're seeing.
It seems to me that we should always incorporate the save/restore cost into
non-volatiles. However, even if we enable the code above for targets that set
HONOR_REG_ALLOC_ORDER, there is still a bug in that the additional cost it
computes above, because it doesn't take into consideration the basic block
frequency assigned to the prologue and epilogue blocks. The additional cost
above really should be multiplied by the prologue/epilogue frequency.
The above analysis means this is no longer target bug, but a bug in the cost
computation in IRA, therefore I am resetting the Component and adding Vlad and
Jeff to the CC for their awareness.
I have a patch to fix the above that I am testing.
>From gcc-bugs-return-616899-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 01:54:31 2018
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Subject: [Bug rtl-optimization/87507] IRA unnecessarily uses non-volatile registers during register assignment
Date: Thu, 04 Oct 2018 01:54:00 -0000
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--- Comment #6 from Peter Bergner <bergner at gcc dot gnu.org> ---
(In reply to Peter Bergner from comment #2)
> Seems to work fine on BE, so probably a LE only issue.
So this is a generic problem, not related to LE. I can get this to fail on BE
as well if I strategically remove some hard regs via using -ffixed-r6
-ffixed-r9 -ffixed-r11.
>From gcc-bugs-return-616900-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 02:03:50 2018
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Subject: [Bug c++/56951] Poor diagnostics for error: invalid abstract return type 'XXX'
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org,
| |dodji at gcc dot gnu.org
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing diagnostics maintainers
>From gcc-bugs-return-616901-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 02:05:43 2018
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Subject: [Bug rtl-optimization/87507] IRA unnecessarily uses non-volatile registers during register assignment
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--- Comment #7 from Peter Bergner <bergner at gcc dot gnu.org> ---
Created attachment 44778
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44778&action=edit
Proprosed patch
FYI, this is what I'm testing.
>From gcc-bugs-return-616902-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 02:06:10 2018
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Subject: [Bug bootstrap/28472] -B$(build_tooldir)/bin/
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|WAITING |RESOLVED
Resolution|--- |INVALID
--- Comment #10 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #9)
> Is this still an issue with newer versions of gcc? Putting in WAITING as per
> https://gcc.gnu.org/bugs/management.html
No reply; closing
>From gcc-bugs-return-616903-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 02:08:12 2018
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Subject: [Bug target/34777] uClibc-0.9.29 compilation error for sh4 arch with gcc-4.x
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--- Comment #15 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Oleg Endo from comment #14)
> (In reply to Eric Gallager from comment #13)
> > >
> > > I've tried that test case with the sh-lra branch and the problems seem to be
> > > gone.
> >
> > So is this FIXED yet then?
>
> LRA is not enabled by default on SH, so I'd say no, not fixed yet. Please
> leave open.
OK, please remember to come back to this if/when LRA is ever the default on SH
then.
>From gcc-bugs-return-616904-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 07:15:55 2018
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Subject: [Bug target/87509] New: ICE in extract_insn, at recog.c:2305
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Bug ID: 87509
Summary: ICE in extract_insn, at recog.c:2305
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: segher at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: ppc64le-linux-gnu
Following ICEs:
$ gcc
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/powerpc/test_fpscr_rn_builtin.c
-mpower9-vector
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/powerpc/test_fpscr_rn_builtin.c:
In function ‘main’:
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/powerpc/test_fpscr_rn_builtin.c:190:1:
error: unrecognizable insn:
190 | }
| ^
(insn 17 16 18 5 (set (reg:DF 155)
(unspec_volatile:DF [
(const_double:DF
1.48219693752373963252970637860466411709517940784297e-323 [0x0.cp-1072])
] UNSPECV_MFFSCRN))
"/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/powerpc/test_fpscr_rn_builtin.c":48
-1
(nil))
during RTL pass: vregs
/home/marxin/Programming/gcc/gcc/testsuite/gcc.target/powerpc/test_fpscr_rn_builtin.c:190:1:
internal compiler error: in extract_insn, at recog.c:2305
0x571507 _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/rtl-error.c:108
0x571523 _fatal_insn_not_found(rtx_def const*, char const*, int, char const*)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/rtl-error.c:116
0x570a10 extract_insn(rtx_insn*)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/recog.c:2305
0x7b75bf instantiate_virtual_regs_in_insn
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/function.c:1605
0x7b75bf instantiate_virtual_regs
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/function.c:1975
0x7b75bf execute
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/function.c:2024
>From gcc-bugs-return-616905-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 07:16:47 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87510] New: ICE in gen_reg_rtx, at emit-rtl.c:1155
Date: Thu, 04 Oct 2018 07:16:00 -0000
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Bug ID: 87510
Summary: ICE in gen_reg_rtx, at emit-rtl.c:1155
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: target
Assignee: unassigned at gcc dot gnu.org
Reporter: marxin at gcc dot gnu.org
CC: segher at gcc dot gnu.org
Target Milestone: ---
Host: x86_64-pc-linux-gnu
Target: ppc64le-linux-gnu
Following ICEs:
$ cat ice.cpp
// RUN: %clang_cc1 -verify -fsyntax-only %s
float foof(float x);
double food(double x);
void foo(bool b, float f);
void bar() {
float c = 1.7;
bool b = c;
double e = 1.7;
b = e;
b = foof(4.0);
b = foof(c < 1); // expected-warning {{implicit conversion turns
floating-point number into bool: 'float' to 'bool'}}
b = food(e < 2); // expected-warning {{implicit conversion turns
floating-point number into bool: 'double' to 'bool'}}
foo(c, b); // expected-warning {{implicit conversion turns floating-point
number into bool: 'float' to 'bool'}}
foo(c, c);
}
$ gcc ice.cpp -mno-popcntd -mcpu=power9 -c
during RTL pass: split5
ice.cpp: In function ‘void bar()’:
ice.cpp:24:1: internal compiler error: in gen_reg_rtx, at emit-rtl.c:1155
24 | }
| ^
0x58d260 gen_reg_rtx(machine_mode)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/emit-rtl.c:1155
0xfc1399 gen_floatdisf2(rtx_def*, rtx_def*)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/config/rs6000/rs6000.md:6237
0xfc1ab2 gen_split_168(rtx_insn*, rtx_def**)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/config/rs6000/rs6000.md:5594
0x8645f6 try_split(rtx_def*, rtx_insn*, int)
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/emit-rtl.c:3851
0xaa6451 split_insn
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/recog.c:2893
0xaaae87 split_all_insns_noflow()
/home/marxin/BIG/buildbot/buildworker/marxinbox-gcc-trunk-ppc64le/build/gcc/recog.c:3055
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
>From gcc-bugs-return-616906-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 08:01:56 2018
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Subject: [Bug ipa/83411] function multiversioning should clone the entire sub-callgraph
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Thank you Hannes for the report and also the nice blog post.
I must agree that's sort of limitation, but I don't agree that it's limiting
much:
1) Note that dispatch happens just once when an executable is started, dynamic
linker resolves all IFUNC indirect calls. Since that you only pay for the
indirect call. However as the target is constant, modern CPUs can predict that
very well.
2) That said it's about finding reasonable big enough code that will be entered
via MV. In your example you selected a function that does only popcount, which
is extremely small and you pay for call overhead. So finding a point like your
'loop' and using flatten attribute can guarantee the call-chain is fully
optimized. Would be interesting to come up with more examples from real
applications.
Anyway, I'm leaving for now this PR and will fix PR82625. It's obvious that
user should pay for entering of MV world just once.
Thanks.
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Subject: [Bug ipa/87491] [9 Regression] ipa_fn_summary missing for node during inlining/dumping
Date: Thu, 04 Oct 2018 08:07:00 -0000
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Thu Oct 4 08:06:52 2018
New Revision: 264835
URL: https://gcc.gnu.org/viewcvs?rev=264835&root=gcc&view=rev
Log:
Call ultimate_alias_target for node being inlined (PR ipa/87491).
2018-10-04 Martin Liska <mliska@suse.cz>
PR ipa/87491
* ipa-inline.c (inline_to_all_callers_1):
Call ultimate_alias_target for node being inlined.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/ipa-inline.c
>From gcc-bugs-return-616908-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 08:08:08 2018
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Subject: [Bug ipa/87491] [9 Regression] ipa_fn_summary missing for node during inlining/dumping
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed.
>From gcc-bugs-return-616909-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 08:13:10 2018
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Subject: [Bug c++/87464] Gcc reports hard error instead of SFINAE out the related method
Date: Thu, 04 Oct 2018 08:13:00 -0000
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Alex <alexejfink at gmx dot net> changed:
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--- Comment #3 from Alex <alexejfink at gmx dot net> ---
Hello,
I am sorry for the confusion. With "works" I did not mention the clang & VC
compile the example -- of course the lines commended as "expected error" do not
compile and shall not compile.
The issue here is not "not compiling", but the wrong/misleading error reporting
of GCC, especially compared to those of clang & VC. GCC reports a substitution
failure at line 27 & 36 as hard error, what according to the SFINAE concept is
not.
The extra hard error report at those lines is misleading and could direct a c++
newbie into wrong direction: to repair this issue by "fixing" the enable_if
guards.
The clang and VC report a "note" for those lines, which is the better way,
IMHO.
best regards,
Alex
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Subject: [Bug target/87509] ICE in extract_insn, at recog.c:2305
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Segher Boessenkool <segher at gcc dot gnu.org> changed:
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--- Comment #1 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Yes. I have a patch.
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Subject: [Bug target/87511] New: [9 Regression][AArch64] UBFIZ instruction with invalid immediate emitted
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Bug ID: 87511
Summary: [9 Regression][AArch64] UBFIZ instruction with invalid
immediate emitted
Product: gcc
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When compiling the code below with aarch64 and -Os
int a, d;
struct {
signed f5 : 26;
signed f6 : 12;
} b;
signed char c;
void fn1() {
signed char *e = &c;
d = a * 10;
*e = d;
b.f6 = c;
b.f5 = 8 <= 3;
}
We get:
$ aarch64-none-elf-gcc -march=armv8-a -c test.c -o /dev/null -Os -Wall
/tmp/ccVimNZB.s: Assembler messages:
/tmp/ccVimNZB.s:20: Error: immediate value out of range 1 to 32 at operand 4 --
`ubfiz x0,x0,32,38'
This started somewhere between r260322 and r261702.
Seems to be incorrectly matching the below in IRA
//(insn:TI 30 22 35 (set (reg:DI 0 x0 [120])
// (and:DI (ashift:DI (reg:DI 0 x0 [orig:92 _3 ] [92])
// (const_int 32 [0x20]))
// (const_int 17587958185983 [0xfff03ffffff]))) "bfiz.c":12 786
\{*andim_ashiftdi_bfiz}
// (nil))
ubfiz x0, x0, 32, 38 // 30 [c=4 l=4] *andim_ashiftdi_bfiz
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Subject: [Bug c++/71139] [concepts] ill-formed compound-requirement lacking a semicolon not rejected
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
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--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Mine.
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Subject: [Bug testsuite/87486] [9 regression] gcc.target/powerpc/undef-bool-2.c fails starting with r264335
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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Subject: [Bug c++/85948] poor location info for arguments and format strings (printf format warning)
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #4 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Thanks for filing this; I'm using PR 56856 to track this (and am testing a
fix).
*** This bug has been marked as a duplicate of bug 56856 ***
>From gcc-bugs-return-616916-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 09:43:59 2018
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Subject: [Bug c++/56856] -Wformat warnings don't show location *within* format string in C++ FE
Date: Thu, 04 Oct 2018 09:43:00 -0000
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |jg at jguk dot org
--- Comment #9 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
*** Bug 85948 has been marked as a duplicate of this bug. ***
>From gcc-bugs-return-616915-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 09:43:48 2018
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From: "ro at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/87487] New test case gfortran.dg/deferred_character_24.f90 in r264721 fails on big endian
Date: Thu, 04 Oct 2018 09:43:00 -0000
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Rainer Orth <ro at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target|powerpc64-unknown-linux-gnu |powerpc64-unknown-linux-gnu
| |, sparc-sun-solaris2.*
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-04
CC| |ro at gcc dot gnu.org
Host|powerpc64-unknown-linux-gnu |
Target Milestone|--- |9.0
Ever confirmed|0 |1
Build|powerpc64-unknown-linux-gnu |
--- Comment #1 from Rainer Orth <ro at gcc dot gnu.org> ---
I'm seeing the same on 64-bit Solaris/SPARC.
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Subject: [Bug tree-optimization/87490] [9 Regression] ICE in expand_builtin_strnlen at gcc/builtins.c:3164
Date: Thu, 04 Oct 2018 09:43:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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>From gcc-bugs-return-616918-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 09:45:59 2018
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Subject: [Bug c++/87494] hidden visibility constexpr variables left unevaluated
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Yeah, I think Andrew is right and this is not a bug.
>From gcc-bugs-return-616919-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 09:47:33 2018
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think you get diagnostics for the procedure pointer and pointer assignment
ones which I guess are technically OK?
>From gcc-bugs-return-616920-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 09:52:22 2018
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Subject: [Bug bootstrap/87498] Inconsistent behaviour for passing -DNO_ASM and host=none
Date: Thu, 04 Oct 2018 09:52:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
gmp is only built as host module, I guess that somehow doesn't work for a
canadian cross where we likely build it as a target module as well by $magic
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Subject: [Bug lto/87499] error: invalid conversion in gimple call for a nested function with lto
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--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
I think the issue is an inconsistency between what types are considered local
and thus we end up duplicating them but not merge them for canonical type
compute. I think we have a duplicate for this.
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From: "miro.kropacek at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug bootstrap/87498] Inconsistent behaviour for passing -DNO_ASM and host=none
Date: Thu, 04 Oct 2018 09:58:00 -0000
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--- Comment #3 from Miro Kropacek <miro.kropacek at gmail dot com> ---
Fix is easy - just pass --disable-assembly to extra_configure_flags.
I guess gcc will have to deal with the 'none' target in the future anyway
because it is deprecated in gmp.
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Bug ID: 87512
Summary: Error: the type ‘const auto’ of ‘constexpr’ variable
is not literal
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
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Priority: P3
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Created attachment 44779
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44779&action=edit
Preprocessed source
The following code fails to compile:
==
#include <type_traits>
template <typename T>
inline constexpr auto IsPtr = std::is_pointer<T>::value;
class Foo;
class Bar;
template <typename T1, typename T2>
void foo(T1, T2);
template <typename T>
std::enable_if_t<IsPtr<T>> foo(T, Foo);
template <>
void foo<Bar>(Bar, Bar);
==
The error:
==
$ g++-8.2.0 -c -std=c++17 test.cpp
test.cpp: In instantiation of ‘constexpr const auto IsPtr<Bar>’:
test.cpp:13:18: required by substitution of ‘template<class T>
std::enable_if_t<IsPtr<T> > foo(T, Foo) [with T = Bar]’
test.cpp:16:23: required from here
test.cpp:4:23: error: the type ‘const auto’ of ‘constexpr’ variable
‘IsPtr<Bar>’ is not literal
inline constexpr auto IsPtr = std::is_pointer<T>::value;
^~~~~
test.cpp:4:23: error: ‘const auto IsPtr<Bar>’ has incomplete type
==
GCC version:
==
$ g++-8.2.0 -v
Using built-in specs.
COLLECT_GCC=g++-8.2.0
COLLECT_LTO_WRAPPER=/home/brd/soft/gcc-8.2.0/libexec/gcc/x86_64-pc-linux-gnu/8.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with: ./configure --prefix=/home/brd/soft/gcc-8.2.0
Thread model: posix
gcc version 8.2.0 (GCC)
==
The preprocessed source is attached.
P.S.
1) Clang is able to compile it.
2) Changing "auto" to "bool" in the definition of IsPtr fixes the error.
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From: "sergeev917 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87513] New: internal compiler error: in write_expression, at cp/mangle.c:3050
Date: Thu, 04 Oct 2018 10:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87513
Bug ID: 87513
Summary: internal compiler error: in write_expression, at
cp/mangle.c:3050
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: sergeev917 at gmail dot com
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Created attachment 44780
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44780&action=edit
preprocessed code sample
=== compiler and system information ===
$ g++-8.2.0 -v
Using built-in specs.
COLLECT_GCC=g++-8.2.0
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/8.2.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/8.2.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/8.2.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/8.2.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/8.2.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/8.2.0/include/g++-v8
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/8.2.0/python
--enable-languages=c,c++,go,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --disable-nls --enable-checking=release
--with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 8.2.0-r3 p1.4'
--disable-esp --enable-libstdcxx-time --disable-libstdcxx-pch --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--disable-multilib --with-multilib-list=m64 --disable-altivec
--disable-fixed-point --enable-targets=all --enable-libgomp
--disable-libmudflap --disable-libssp --disable-libmpx --disable-systemtap
--enable-vtable-verify --enable-libvtv --enable-lto --without-isl
--enable-libsanitizer --enable-default-pie --enable-default-ssp
Thread model: posix
gcc version 8.2.0 (Gentoo 8.2.0-r3 p1.4)
=== the complete command line that triggers the bug, the compiler output ===
$ g++-8.2.0 -std=c++14 -o /dev/null -c ice_sample_8.2.0.ii
In file included from main.cc:2:
crow/app.h: In instantiation of 'typename std::result_of<decltype (&
crow::Router::new_rule_tagged<Tag>)(crow::Router,
std::__cxx11::basic_string<char>&&)>::type
crow::Crow<Middlewares>::route(std::__cxx11::string&&) [with long unsigned int
Tag = 0; Middlewares = {}]':
main.cc:8:1: required from here
crow/app.h:63:14: internal compiler error: in write_expression, at
cp/mangle.c:3050
auto route(std::string&& rule)
^~~~~
0x59167a write_expression
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/cp/mangle.c:3050
0x65a9af write_expression
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/cp/mangle.c:3373
0x65876e write_type
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/cp/mangle.c:2352
0x659d1d write_bare_function_type
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/cp/mangle.c:2731
0x65d39b write_function_type
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/cp/mangle.c:2706
0x658244 write_type
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/cp/mangle.c:2214
0x65d58b write_template_args
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/cp/mangle.c:2841
0x65d8da write_prefix
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/cp/mangle.c:1146
0x6574ba write_nested_name
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/cp/mangle.c:1076
0x658680 write_type
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/cp/mangle.c:2232
0x659d1d write_bare_function_type
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/cp/mangle.c:2731
0x65dcf4 mangle_decl_string
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/cp/mangle.c:3795
0x65df28 get_mangled_id
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/cp/mangle.c:3817
0x65df28 mangle_decl(tree_node*)
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/cp/mangle.c:3855
0xdaaf99 decl_assembler_name(tree_node*)
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/tree.c:687
0x7e0fc5 symbol_table::insert_to_assembler_name_hash(symtab_node*, bool)
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/symtab.c:174
0x7e1924 symbol_table::symtab_initialize_asm_name_hash()
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/symtab.c:266
0x7e19b4 symbol_table::symtab_initialize_asm_name_hash()
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/symtab.c:976
0x7e19b4 symtab_node::get_for_asmname(tree_node const*)
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/symtab.c:964
0x7f1660 handle_alias_pairs
/var/tmp/portage/sys-devel/gcc-8.2.0-r3/work/gcc-8.2.0/gcc/cgraphunit.c:1398
=== an (older) working version of the compiler ===
$ g++-7.3.0 -v
Using built-in specs.
COLLECT_GCC=g++-7.3.0
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-pc-linux-gnu/7.3.0/lto-wrapper
Target: x86_64-pc-linux-gnu
Configured with:
/var/tmp/portage/sys-devel/gcc-7.3.0-r3/work/gcc-7.3.0/configure
--host=x86_64-pc-linux-gnu --build=x86_64-pc-linux-gnu --prefix=/usr
--bindir=/usr/x86_64-pc-linux-gnu/gcc-bin/7.3.0
--includedir=/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/include
--datadir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.3.0
--mandir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.3.0/man
--infodir=/usr/share/gcc-data/x86_64-pc-linux-gnu/7.3.0/info
--with-gxx-include-dir=/usr/lib/gcc/x86_64-pc-linux-gnu/7.3.0/include/g++-v7
--with-python-dir=/share/gcc-data/x86_64-pc-linux-gnu/7.3.0/python
--enable-languages=c,c++,go,fortran --enable-obsolete --enable-secureplt
--disable-werror --with-system-zlib --disable-nls --enable-checking=release
--with-bugurl=https://bugs.gentoo.org/ --with-pkgversion='Gentoo 7.3.0-r3 p1.4'
--disable-esp --enable-libstdcxx-time --disable-libstdcxx-pch --enable-shared
--enable-threads=posix --enable-__cxa_atexit --enable-clocale=gnu
--disable-multilib --with-multilib-list=m64 --disable-altivec
--disable-fixed-point --enable-targets=all --disable-libgcj --enable-libgomp
--disable-libmudflap --disable-libssp --disable-libcilkrts --enable-libmpx
--enable-vtable-verify --enable-libvtv --enable-lto --without-isl
--enable-libsanitizer --enable-default-pie --enable-default-ssp
Thread model: posix
gcc version 7.3.0 (Gentoo 7.3.0-r3 p1.4)
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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/87505] Vectorizer generates a lot of code for a small loop
Date: Thu, 04 Oct 2018 10:05:00 -0000
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Hmm, we compute the loop iterates
((long unsigned int) base_9(D) - (long unsigned int) (int) base_9(D)) + 3
times. You can probably spot the cases of INT_MAX < base < UINT_MAX
not iterating at all (i is sign-extended to std::size_t for the comparison)
and base > UINT_MAX where it iterates quite a lot (eventually).
We have to account for these cases. If you make the suggested adjustment
then of course we know the loop always iterates 4 times.
Unless I missed something of course.
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--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Both making i std::size_t or casting (base + 4) to int "fixes" this.
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Subject: [Bug c++/87506] [7/8/9 Regression] ICE with inherited constexpr constructor with const argument
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----------------------------------------------------------------------------
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Subject: [Bug target/87511] [9 Regression][AArch64] UBFIZ instruction with invalid immediate emitted
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Paul Thomas <pault at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Assignee|unassigned at gcc dot gnu.org |pault at gcc dot gnu.org
--- Comment #2 from Paul Thomas <pault at gcc dot gnu.org> ---
Created attachment 44781
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44781&action=edit
Possible fix
Does this do it for you?
I am very surprised to run into an endian problem with this.
Cheers
Paul
>From gcc-bugs-return-616930-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 10:50:41 2018
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Subject: [Bug fortran/56789] Handling of contiguous dummy arguments
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Paul Thomas <pault at gcc dot gnu.org> changed:
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--- Comment #17 from Paul Thomas <pault at gcc dot gnu.org> ---
Created attachment 44782
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44782&action=edit
"fix" for the PR
Ignoring the niceties of the standard for the moment, this "fixes" the problem;
or, at least, it runs as intended.
Cheers
Paul
>From gcc-bugs-return-616931-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 10:58:22 2018
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Subject: [Bug fortran/56789] Handling of contiguous dummy arguments
Date: Thu, 04 Oct 2018 10:58:00 -0000
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--- Comment #18 from Harald Anlauf <anlauf at gmx dot de> ---
(In reply to Paul Thomas from comment #12)
> (In reply to Harald Anlauf from comment #11)
> > (In reply to paul.richard.thomas@gmail.com from comment #10)
> > > Even if that were allowed, the standard explicitly disallows the
> > > argument association in the testcase: See 5.3.7 of the F2008 standard.
> >
> > The wording has changed in F2018 DIS, 8.5.7, paragraph 1:
> >
> > The CONTIGUOUS attribute specifies that an assumed-shape array is contiguous,
> > that an array pointer can only be pointer associated with a contiguous
> > target,
> > or that an assumed-rank dummy data object is contiguous.
> >
> >
> > In my interpretation, the testcase is valid under F2018, but invalid in
> > F2008.
>
> Hmmm! The F2018 standard is almost obfusticating about argument association
> with contiguous dummies. I will wade through the pertinent sections tonight.
>
> Paul
FWIW: Crayftn, Intel, PGI, NAG all accept the code without complaining and seem
to do the packing/unpacking.
>From gcc-bugs-return-616932-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 11:01:01 2018
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Subject: [Bug libstdc++/87514] New: std::make_shared could avoid virtual call to _M_get_deleter()
Date: Thu, 04 Oct 2018 11:00:00 -0000
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Bug ID: 87514
Summary: std::make_shared could avoid virtual call to
_M_get_deleter()
Product: gcc
Version: 9.0
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Keywords: missed-optimization
Severity: enhancement
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In __shared_ptr(_Sp_make_shared_tag, const _Alloc&, _Args&&...) we do:
// _M_ptr needs to point to the newly constructed object.
// This relies on _Sp_counted_ptr_inplace::_M_get_deleter.
#if __cpp_rtti
void* __p = _M_refcount._M_get_deleter(typeid(__tag));
#else
void* __p = _M_refcount._M_get_deleter(_Sp_make_shared_tag::_S_ti());
#endif
_M_refcount._M_get_deleter does:
void*
_M_get_deleter(const std::type_info& __ti) const noexcept
{ return _M_pi ? _M_pi->_M_get_deleter(__ti) : nullptr; }
which does an indirect virtual call _Sp_counted_ptr_inplace::_M_get_deleter.
In the __shared_ptr(_Sp_make_shared_tag ...) constructor we know the dynamic
type of *_M_refcount._M_pi is definitely _Sp_counted_ptr_inplace and so could
theoretically avoid the dynamic dispatch.
This would require breaking encapsulation to allow __shared_ptr to access the
private __shared_count::_M_pi member. Is it worth it?
It's possible this can already be devirtualized by the compiler, but only when
optimising. If it isn't, then this might help:
@@ -653,9 +652,8 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
typedef _Sp_counted_ptr_inplace<_Tp, _Alloc, _Lp> _Sp_cp_type;
typename _Sp_cp_type::__allocator_type __a2(__a);
auto __guard = std::__allocate_guarded(__a2);
- _Sp_cp_type* __mem = __guard.get();
- ::new (__mem) _Sp_cp_type(__a, std::forward<_Args>(__args)...);
- _M_pi = __mem;
+ _M_pi = ::new (__guard.get())
+ _Sp_cp_type(__a, std::forward<_Args>(__args)...);
__guard = nullptr;
}
>From gcc-bugs-return-616933-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 11:04:42 2018
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Subject: [Bug testsuite/87487] New test case gfortran.dg/deferred_character_24.f90 in r264721 fails on big endian
Date: Thu, 04 Oct 2018 11:04:00 -0000
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--- Comment #3 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> --- Comment #2 from Paul Thomas <pault at gcc dot gnu.org> ---
> Created attachment 44781
> --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44781&action=edit
> Possible fix
>
> Does this do it for you?
As a quick test, I just rebuilt f951 and ran the single testcase: it
PASSes now for both 32 and 64-bit.
Thanks.
Rainer
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Subject: [Bug c++/87464] Gcc reports hard error instead of SFINAE out the related method
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
--- Comment #4 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Adding diagnostic keyword, since the issue is simply that when showing the
reason for substitution failure we show an error not a note.
>From gcc-bugs-return-616935-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 11:07:02 2018
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Subject: [Bug tree-optimization/85787] malloc_candidate_p fails to detect malloc attribute on nested phis
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--- Comment #2 from prathamesh3492 at gcc dot gnu.org ---
Author: prathamesh3492
Date: Thu Oct 4 11:06:24 2018
New Revision: 264838
URL: https://gcc.gnu.org/viewcvs?rev=264838&root=gcc&view=rev
Log:
2018-10-04 Prathamesh Kulkarni <prathamesh.kulkarni@linaro.org>
PR tree-optimization/85787
* ipa-pure-const.c (malloc_candidate_p_1): Move most of
malloc_candidate_p
into this function and add support for detecting multiple phis.
(DUMP_AND_RETURN): Move from malloc_candidate_p into top-level macro.
testsuite/
* gcc.dg/ipa/propmalloc-4.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/ipa/propmalloc-4.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/ipa-pure-const.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug libstdc++/87514] std::make_shared could avoid virtual call to _Sp_counted_ptr_inplace::_M_get_deleter()
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-04
Summary|std::make_shared could |std::make_shared could
|avoid virtual call to |avoid virtual call to
|_M_get_deleter() |_Sp_counted_ptr_inplace::_M
| |_get_deleter()
Ever confirmed|0 |1
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Subject: [Bug libstdc++/87514] std::make_shared could avoid virtual call to _Sp_counted_ptr_inplace::_M_get_deleter()
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--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #0)
> In the __shared_ptr(_Sp_make_shared_tag ...) constructor we know the dynamic
> type of *_M_refcount._M_pi is definitely _Sp_counted_ptr_inplace and so
> could theoretically avoid the dynamic dispatch.
>
> This would require breaking encapsulation to allow __shared_ptr to access
> the private __shared_count::_M_pi member. Is it worth it?
If we're going to do that, we might as well avoid the _M_get_deleter kluge
entirely. We could just directly access _M_refcount._M_pi->_M_ptr() to get the
pointer out, instead of using the _M_get_deleter override as a backchannel.
>From gcc-bugs-return-616938-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 11:58:26 2018
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Subject: [Bug c++/87515] New: "no return statement in function returning non-void" miscompiles with optimizations
Date: Thu, 04 Oct 2018 11:58:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87515
Bug ID: 87515
Summary: "no return statement in function returning non-void"
miscompiles with optimizations
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
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Assignee: unassigned at gcc dot gnu.org
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Happens with gcc version 8.2.0 (Debian 8.2.0-7), standalone near-minimal
testcase:
#include <iostream>
using namespace std;
int blam(int x) {
if (x!=0) {
cout << x << " != 0" << endl;
}
}
int main() {
blam(0);
blam(1);
}
Expected behavior: prints 1 != 0, this actually happens without optimizations.
Unexpected behavior happens with optimizations enabled (-O is enough): it
prints nothing.
I realize that the code is not fully valid, but the resulting behavior is
surprising to say the least. Or the warning should be an error instead. We have
found some variants along the same lines in our codebase that print the
equivalent of 0!=0 and/or segfault.
>From gcc-bugs-return-616939-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 12:13:52 2018
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Subject: [Bug c++/87515] "no return statement in function returning non-void" miscompiles with optimizations
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
CC| |marxin at gcc dot gnu.org
Resolution|--- |INVALID
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r254437.
The code is invalid and we produce warning for it by default:
pr87515.cpp: In function ‘int blam(int)’:
pr87515.cpp:8:1: warning: no return statement in function returning non-void
[-Wreturn-type]
}
^
Please add -Werror=return-type to your flags and you will find all problematic
places.
>From gcc-bugs-return-616940-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 12:20:15 2018
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Subject: [Bug c++/87513] internal compiler error: in write_expression, at cp/mangle.c:3050
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-04
CC| |marxin at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
Confirmed, I'm reducing that..
>From gcc-bugs-return-616942-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 12:20:59 2018
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Subject: [Bug bootstrap/87516] [9 Regression] AArch64 bootstrap ICEs in ipa-fnsummary.c:2492
Date: Thu, 04 Oct 2018 12:20:00 -0000
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ktkachov at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |9.0
Known to fail| |9.0
>From gcc-bugs-return-616941-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 12:20:26 2018
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Subject: [Bug bootstrap/87516] New: [9 Regression] AArch64 bootstrap ICEs in ipa-fnsummary.c:2492
Date: Thu, 04 Oct 2018 12:20:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87516
Bug ID: 87516
Summary: [9 Regression] AArch64 bootstrap ICEs in
ipa-fnsummary.c:2492
Product: gcc
Version: unknown
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
Component: bootstrap
Assignee: unassigned at gcc dot gnu.org
Reporter: ktkachov at gcc dot gnu.org
CC: marxin at gcc dot gnu.org
Target Milestone: ---
Target: aarch64
typedef __Int16x8_t int16x8_t;
typedef __Uint16x8_t uint16x8_t;
void fn1(uint16x8_t __a) {
__builtin_aarch64_reduc_plus_scal_v8hi((int16x8_t)__a);
}
The above reduced testcase (from the expansion of the vaddvq_u16 aarch64
intrinsic) ICEs on aarch64 at all optimisation levels with:
lex.ii:5:1: internal compiler error: in compute_fn_summary, at
ipa-fnsummary.c:2492
5 | }
| ^
0xbe6adf compute_fn_summary(cgraph_node*, bool)
$SRC/gcc/ipa-fnsummary.c:2492
0xbe6cfb compute_fn_summary_for_current
$SRC/gcc/ipa-fnsummary.c:2502
0xbe6cfb execute
$SRC/gcc/ipa-fnsummary.c:3516
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <https://gcc.gnu.org/bugs/> for instructions.
I suspect this is to do with target options mismatch or something
>From gcc-bugs-return-616943-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 12:21:09 2018
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From: "paul.richard.thomas at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/87487] New test case gfortran.dg/deferred_character_24.f90 in r264721 fails on big endian
Date: Thu, 04 Oct 2018 12:21:00 -0000
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--- Comment #4 from paul.richard.thomas at gmail dot com <paul.richard.thomas at gmail dot com> ---
Dear Rainer,
That's a relief! Thank you for the fast response. I will commit tonight.
Paul
On Thu, 4 Oct 2018 at 12:04, ro at CeBiTec dot Uni-Bielefeld.DE
<gcc-bugzilla@gcc.gnu.org> wrote:
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87487
>
> --- Comment #3 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> ---
> > --- Comment #2 from Paul Thomas <pault at gcc dot gnu.org> ---
> > Created attachment 44781
> > --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44781&action=edit
> > Possible fix
> >
> > Does this do it for you?
>
> As a quick test, I just rebuilt f951 and ran the single testcase: it
> PASSes now for both 32 and 64-bit.
>
> Thanks.
> Rainer
>
> --
> You are receiving this mail because:
> You are on the CC list for the bug.
> You are the assignee for the bug.
>From gcc-bugs-return-616944-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 12:23:38 2018
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Subject: [Bug fortran/55735] ICE with deferred-length strings in COMMON
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--- Comment #4 from Jürgen Reuter <juergen.reuter at desy dot de> ---
In the recent trunk (r264725) does _not_ give an ICE anymore, but the code is
vetoed as non-standard, as it is for nagfor and ifort. So, should this be
closed now?
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Subject: [Bug c++/87513] [8/9 Regression] ICE in write_expression, at cp/mangle.c:3050
Date: Thu, 04 Oct 2018 12:23:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |ice-on-valid-code
CC| |jason at gcc dot gnu.org
Target Milestone|--- |8.3
Summary|internal compiler error: in |[8/9 Regression] ICE in
|write_expression, at |write_expression, at
|cp/mangle.c:3050 |cp/mangle.c:3050
Known to fail| |8.2.0, 9.0
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
Started with r251438.
Can you please attach pre-processed source file created with GCC 7.3.x ?
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Subject: [Bug c++/87513] [8/9 Regression] ICE in write_expression, at cp/mangle.c:3050
Date: Thu, 04 Oct 2018 12:28:00 -0000
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--- Comment #3 from Alexander Sergeyev <sergeev917 at gmail dot com> ---
Created attachment 44783
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44783&action=edit
preprocessed code sample (gcc-7.3.0)
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug bootstrap/87516] [9 Regression] AArch64 bootstrap ICEs in ipa-fnsummary.c:2492
Date: Thu, 04 Oct 2018 12:28:00 -0000
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ktkachov at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
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--- Comment #1 from ktkachov at gcc dot gnu.org ---
Turns out it was a local change of mine causing it. Sorry for the noise.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87513] [8/9 Regression] ICE in write_expression, at cp/mangle.c:3050
Date: Thu, 04 Oct 2018 12:32:00 -0000
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Known to work| |7.2.0
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Thanks!
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Subject: [Bug c++/87494] hidden visibility constexpr variables left unevaluated
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Nathan Froyd <froydnj at gcc dot gnu.org> changed:
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--- Comment #4 from Nathan Froyd <froydnj at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> I don't think this is techincally a bug. It might be a missed optimization
> but not a bug. You still need a definition even for constexpr if used
> outside of a constexpr usage IIRC.
You can only use `constexpr` on variable definitions, not declarations. So I
already have a definition, and I can't imagine where another one should be
added.
FWIW, clang and MSVC both accept this code without problems.
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug gcov-profile/84107] indirect call profiling broken with multiple DSOs
Date: Thu, 04 Oct 2018 12:41:00 -0000
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--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
"Large symbols and symbols that must exist in exactly one instance in the
running program probably should be a part of (nonexistent) libgcov.so.0."
which are those? I expected individual gcov "instances" to live across
dynamic object lifetime. That is, does a shared libgcov fix the case
of dlopen()ing and dlclose()ing shared objects (multiple times)?
--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Thu Oct 4 12:41:14 2018
New Revision: 264840
URL: https://gcc.gnu.org/viewcvs?rev=264840&root=gcc&view=rev
Log:
Fix divergence in indirect profiling (PR gcov-profile/84107).
2018-10-04 Martin Liska <mliska@suse.cz>
PR gcov-profile/84107
* tree-profile.c (init_ic_make_global_vars):
Remove ic_void_ptr_var and ic_gcov_type_ptr_var.
Come up with new ic_tuple* variables. Emit
__gcov_indirect_call{,_topn} variables.
(gimple_gen_ic_profiler): Access the variable
and emit gimple.
(gimple_gen_ic_func_profiler): Access
__gcov_indirect_call.callee field.
(gimple_init_gcov_profiler): Use ptr_type_node.
* value-prof.c (gimple_ic): Use ptr_type_node.
2018-10-04 Martin Liska <mliska@suse.cz>
PR gcov-profile/84107
* libgcov-profiler.c (__gcov_indirect_call):
Change type to indirect_call_tuple.
(struct indirect_call_tuple): New struct.
(__gcov_indirect_call_topn_profiler): Change type.
(__gcov_indirect_call_profiler_v2): Use the new
variables.
* libgcov.h (struct indirect_call_tuple): New struct
definition.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/tree-profile.c
trunk/gcc/value-prof.c
trunk/libgcc/ChangeLog
trunk/libgcc/libgcov-profiler.c
trunk/libgcc/libgcov.h
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Subject: [Bug target/87517] New: Typo in avx512fintrin.h
Date: Thu, 04 Oct 2018 12:41:00 -0000
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Bug ID: 87517
Summary: Typo in avx512fintrin.h
Product: gcc
Version: 9.0
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Component: target
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Target: i386,x86-64
avx512fintrin.h has
extern __inline __m512d
__attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
_mm512_mask_fmaddsub_round_pd (__m512d __A, __mmask8 __U, __m512d __B,
__m512d __C, const int __R)
{
return (__m512d) __builtin_ia32_vfmaddsubpd512_mask ((__v8df) __A,
(__v8df) __B,
(__v8df) __C,
(__mmask8) __U, __R);
}
...
#define _mm512_mask_fmaddsub_round_pd(A, U, B, C, R) \
(__m512d)__builtin_ia32_vfmaddpd512_mask(A, B, C, U, R)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ This should be
__builtin_ia32_vfmaddsubpd512_mask
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Subject: [Bug gcov-profile/84107] indirect call profiling broken with multiple DSOs
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
I would like to close this as resolved. Discussion about introduction of
libgcov.so happens here: https://gcc.gnu.org/ml/gcc/2018-09/msg00115.html
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Subject: [Bug c++/87513] [8/9 Regression] ICE in write_expression, at cp/mangle.c:3050
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87513
--- Comment #5 from Alexander Sergeyev <sergeev917 at gmail dot com> ---
(In reply to Martin Liška from comment #4)
> Thanks!
No problems. Let me know if I could do anything else.
>From gcc-bugs-return-616954-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 12:46:21 2018
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/87513] [8/9 Regression] ICE in write_expression, at cp/mangle.c:3050
Date: Thu, 04 Oct 2018 12:46:00 -0000
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--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Alexander Sergeyev from comment #5)
> (In reply to Martin Liška from comment #4)
> > Thanks!
>
> No problems. Let me know if I could do anything else.
Now all you need to do is to be patient and wait for a fix ;)
>From gcc-bugs-return-616955-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 12:54:16 2018
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From: "jaydee at email dot cz" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87515] "no return statement in function returning non-void" miscompiles with optimizations
Date: Thu, 04 Oct 2018 12:54:00 -0000
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--- Comment #2 from Jakub Drnec <jaydee at email dot cz> ---
Ok, will use -Werror=return-type , thanks. Looking at the discussion in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=43943 this really is not legal
code, I merely wasn't expecting the nasal demons to be this vigorous.
>From gcc-bugs-return-616956-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 13:14:13 2018
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From: "pierreblavy at yahoo dot fr" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87518] New: namespace and typedef : scope problem
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87518
Bug ID: 87518
Summary: namespace and typedef : scope problem
Product: gcc
Version: 8.1.1
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Created attachment 44784
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44784&action=edit
test code
Hello.
The following c++ code compiles with 'clang++ -std=c++17 test.cpp' but not with
'g++ -std=c++17 test.cpp'
I don't know who's right between clang and gcc, but I suspect that gcc reads
the 'typedef t t' line backward, and therefore override the first 't' with the
second one.
This bug might be related to bug number 23594
Best regards
--- test.cpp ---
namespace test{
typedef double t;
struct A{
typedef t t;
};
}
int main(int,char**){return 0;}
--- g++ error message ---
g++ -std=c++17 test.cpp
test.cpp:5:16: error: declaration of ‘typedef test::t test::A::t’
[-fpermissive]
typedef t t;
^
test.cpp:2:19: error: changes meaning of ‘t’ from ‘typedef double test::t’
[-fpermissive]
typedef double t;
--- g++ --version ---
g++ (GCC) 8.1.1 20180712 (Red Hat 8.1.1-5)
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Subject: [Bug c++/87519] New: -Wsign-conversion erroneosly triggered when converting to auto-deduced interger type
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87519
Bug ID: 87519
Summary: -Wsign-conversion erroneosly triggered when converting
to auto-deduced interger type
Product: gcc
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Created attachment 44785
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44785&action=edit
Minimal source code that triggers the bug
Version and system: gcc version 7.3.0 (Ubuntu 7.3.0-21ubuntu1~16.04)
Command line: gcc -v -save-temps -Werror -Wsign-conversion --std=c++17 bug.cpp
Full source code and
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Subject: [Bug c++/87519] -Wsign-conversion erroneosly triggered when converting to auto-deduced interger type
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--- Comment #1 from Ivan Fefer <fefer.ivan at gmail dot com> ---
Created attachment 44786
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Full stderr of compiler
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Subject: [Bug c++/87519] -Wsign-conversion erroneosly triggered when converting to auto-deduced interger type
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--- Comment #2 from Ivan Fefer <fefer.ivan at gmail dot com> ---
Created attachment 44787
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44787&action=edit
Code after preprocessing
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Subject: [Bug c++/87519] -Wsign-conversion erroneosly triggered when converting to auto-deduced interger type
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--- Comment #3 from Ivan Fefer <fefer.ivan at gmail dot com> ---
Created attachment 44788
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44788&action=edit
Temp compiler file
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From: "fefer.ivan at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87519] -Wsign-conversion erroneosly triggered when converting to auto-deduced interger type
Date: Thu, 04 Oct 2018 13:24:00 -0000
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--- Comment #4 from Ivan Fefer <fefer.ivan at gmail dot com> ---
Sorry, hit the Submit button too early by accident.
Source code and compiler output are attached.
Bug is -Wsign-conversion warning triggerring:
bug.cpp:5:11: error: conversion to ‘long unsigned int’ from ‘int32_t {aka int}’
may change the sign of the result [-Werror=sign-conversion]
r = r + static_cast<uint64_t>(q);
^~~~~~~~~~~~~~~~~~~~~~~~
in function
void f(uint64_t a, int32_t q) {
auto& r = a;
r = r + static_cast<uint64_t>(q);
}
If we replace 'auto& r = a' with 'uint64_t& r = a' warning with disappear.
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--- Comment #5 from Ivan Fefer <fefer.ivan at gmail dot com> ---
Same code at Godbolt.org: https://gcc.godbolt.org/
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From: "juergen.reuter at desy dot de" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug fortran/64120] [F03] Wrong handling of allocatable character string
Date: Thu, 04 Oct 2018 13:26:00 -0000
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--- Comment #10 from Jürgen Reuter <juergen.reuter at desy dot de> ---
I think inside the logical function (in the local scope) the length of s has to
be printed as the value of the argument x, so 1 and 2, with or without the
'save' attribute.
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Subject: [Bug c++/87519] -Wsign-conversion erroneosly triggered when converting to auto-deduced interger type
Date: Thu, 04 Oct 2018 13:32:00 -0000
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--- Comment #6 from Ivan Fefer <fefer.ivan at gmail dot com> ---
https://gcc.godbolt.org/z/hOpMyc
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Subject: [Bug rtl-optimization/87466] IRA and LRA spill all pseudos that are live across setjmp calls
Date: Thu, 04 Oct 2018 13:37:00 -0000
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--- Comment #4 from Peter Bergner <bergner at gcc dot gnu.org> ---
Author: bergner
Date: Thu Oct 4 13:36:20 2018
New Revision: 264842
URL: https://gcc.gnu.org/viewcvs?rev=264842&root=gcc&view=rev
Log:
gcc/
PR rtl-optimization/87466
* target.def (setjmp_preserves_nonvolatile_regs_p): New target hook.
* doc/tm.texi.in (TARGET_SETJMP_PRESERVES_NONVOLATILE_REGS_P): New
hook.
* doc/tm.texi: Regenerate.
* ira-lives.c (process_bb_node_lives): Use the new target hook.
* lra-lives.c (process_bb_lives): Likewise.
* config/rs6000/rs6000.c (TARGET_SETJMP_PRESERVES_NONVOLATILE_REGS_P):
Define.
gcc/testsuite/
PR rtl-optimization/87466
* gcc.target/powerpc/pr87466.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/powerpc/pr87466.c
Modified:
trunk/gcc/config/rs6000/rs6000.c
trunk/gcc/doc/tm.texi
trunk/gcc/doc/tm.texi.in
trunk/gcc/ira-lives.c
trunk/gcc/lra-lives.c
trunk/gcc/target.def
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Subject: [Bug c++/87513] [8/9 Regression] ICE in write_expression, at cp/mangle.c:3050
Date: Thu, 04 Oct 2018 13:40:00 -0000
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--- Comment #7 from Martin Liška <marxin at gcc dot gnu.org> ---
Reduced test-case:
$ cat ice.ii
template < int a > struct b { static constexpr int c = a; };
template < typename > struct d;
template < typename > struct e;
template < typename f, typename g > struct e< f g::* > : b< d< f >::c > {};
template < typename h, typename... i > struct d< h(i...) > : b< true > {};
template < typename > class j;
struct k {
typedef int l;
};
template < bool, bool, typename... > struct m;
template < typename ab, typename n, typename... o >
struct m< false, true, ab, n, o... > : k {};
template < typename ac, typename... i >
struct ad : m< b< false >::c, e< ac >::c, i... > {};
template < typename ac, typename... i >
struct j< ac(i...) > : ad< ac, i... > {};
class p {
public:
p(char *);
};
class q {
public:
template < long > void r();
};
class s {
public:
template < long t >
auto ae(p) -> typename j< decltype (&q::r< t >)(q, p) >::l;
};
using z = s;
void f() {
z ag;
ag.ae< 0 >("");
}
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Subject: [Bug libstdc++/87520] New: [8/9 Regression] ODR violations in std::make_shared when mixing -fno-rtti and -frtti
Date: Thu, 04 Oct 2018 13:40:00 -0000
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Bug ID: 87520
Summary: [8/9 Regression] ODR violations in std::make_shared
when mixing -fno-rtti and -frtti
Product: gcc
Version: 8.2.1
Status: UNCONFIRMED
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cat > main.cc << EOT
#include <memory>
extern int f();
// For the purposes of this demo, force a non-weak definition of
// _Sp_counted_ptr_inplace::_M_get_deleter(const type_info&) to be emitted
// in this translation unit:
template class
std::_Sp_counted_ptr_inplace<int, std::allocator<int>, std::_S_atomic>;
int main()
{
return f();
}
EOT
cat > sp.cc << EOT
#include <memory>
int f()
{
return *std::make_shared<int>();
}
EOT
g++ -fno-rtti main.cc -c -g
g++ -frtti sp.cc -c -g
g++ main.o sp.o
./a.out
This crashes:
Segmentation fault (core dumped)
The problem is that the definition of _Sp_counter_ptr_inplace::_M_get_deleter
that the linker chooses was compiled with -fno-rtti but the caller was compiled
with -frtti. The caller passes typeid(_Sp_make_shared_tag) which does not match
the expected value in _M_get_deleter, so a null pointer is returned. That
leaves the new shared_ptr holding a null pointer, so dereferencing it in f()
crashes.
This crash happens for all versions.
A nastier failure happens with gcc-8 and trunk if we swap which object is built
with RTTI and which without:
g++ -frtti main.cc -c -g
g++ -fno-rtti sp.cc -c -g
g++ main.o sp.o
./a.out
This crashes earlier, during construction of the shared_ptr:
Program received signal SIGSEGV, Segmentation fault.
0x00000000004008cb in std::type_info::operator== (this=0x401700
<std::_Sp_make_shared_tag::_S_ti()::__tag>, __arg=...) at
/home/jwakely/gcc/8/include/c++/8.2.1/typeinfo:123
(gdb) bt
#0 0x00000000004008cb in std::type_info::operator== (this=0x401700
<std::_Sp_make_shared_tag::_S_ti()::__tag>, __arg=...) at
/home/jwakely/gcc/8/include/c++/8.2.1/typeinfo:123
#1 0x0000000000400a31 in std::_Sp_counted_ptr_inplace<int,
std::allocator<int>, (__gnu_cxx::_Lock_policy)2>::_M_get_deleter
(this=0x615e70, type_info node=...) at
/home/jwakely/gcc/8/include/c++/8.2.1/bits/shared_ptr_base.h:569
#2 0x0000000000401264 in
std::__shared_count<(__gnu_cxx::_Lock_policy)2>::_M_get_deleter
(this=0x7fffffffd858, type_info node=...) at
/home/jwakely/gcc/8/include/c++/8.2.1/bits/shared_ptr_base.h:749
#3 0x00000000004010ba in std::__shared_ptr<int,
(__gnu_cxx::_Lock_policy)2>::__shared_ptr<std::allocator<int>>(std::_Sp_make_shared_tag,
std::allocator<int> const&) (this=0x7fffffffd850, __tag=..., __a=...) at
/home/jwakely/gcc/8/include/c++/8.2.1/bits/shared_ptr_base.h:1329
#4 0x0000000000401055 in
std::shared_ptr<int>::shared_ptr<std::allocator<int>>(std::_Sp_make_shared_tag,
std::allocator<int> const&) (this=0x7fffffffd850, __tag=..., __a=...) at
/home/jwakely/gcc/8/include/c++/8.2.1/bits/shared_ptr.h:360
#5 0x0000000000400f8a in std::allocate_shared<int,
std::allocator<int>>(std::allocator<int> const&) (__a=...) at
/home/jwakely/gcc/8/include/c++/8.2.1/bits/shared_ptr.h:707
#6 0x0000000000400ed5 in std::make_shared<int> () at
/home/jwakely/gcc/8/include/c++/8.2.1/bits/shared_ptr.h:723
#7 0x0000000000400d80 in f () at sp.cc:5
#8 0x000000000040089b in main () at main.cc:13
This is due to the fix for PR 80285. The __shared_ptr constructor is built
without RTTI so calls _M_get_deleter(_Sp_make_shared_tag::_S_ti()). The
definition of _M_get_deleter is built with RTTI so expects a real typeinfo
object. When accessing the fake _S_ti() typeinfo object we crash, because it's
an invalid reference that isn't bound to a real typeinfo.
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Subject: [Bug rtl-optimization/87466] IRA and LRA spill all pseudos that are live across setjmp calls
Date: Thu, 04 Oct 2018 13:43:00 -0000
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Peter Bergner <bergner at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Peter Bergner <bergner at gcc dot gnu.org> ---
Patch committed to trunk, so fixed.
>From gcc-bugs-return-616969-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 13:51:56 2018
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Subject: [Bug c++/87518] namespace and typedef : scope problem
Date: Thu, 04 Oct 2018 13:51:00 -0000
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
The standard says:
A name N used in a class S shall refer to the same declaration in its context
and when re-evaluated in the completed scope of S. No diagnostic is required
for a violation of this rule.
Before the typedef the name 't' refers to the declaration of test::t, but after
the typedef the name 't' refers to the declaration of A::t.
Even though the two declarations denote the same type, they are distinct
declarations, which violates the rule. Clang is less strict and does not
diagnose the violation of the rule.
Arguably a special case could be given to allow it when the two declarations
refer to the same entity, but since the typedef seems completely pointless
anyway I don't see any benefit to adding a special case.
>From gcc-bugs-return-616970-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 13:52:45 2018
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Subject: [Bug c++/87518] namespace and typedef : scope problem
Date: Thu, 04 Oct 2018 13:52:00 -0000
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--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
P.S. it has nothing to do with namespaces:
typedef double t;
struct A{
typedef t t;
};
int main() { }
>From gcc-bugs-return-616971-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 13:55:40 2018
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Subject: [Bug c++/87518] namespace and typedef : scope problem
Date: Thu, 04 Oct 2018 13:55:00 -0000
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--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Also see [dcl.typedef] paragraphs 3 and 4 in the standard, which has an example
very similar to this:
struct S {
typedef struct A { } A; // OK
typedef struct B B; // OK
typedef A A; // error
};
>From gcc-bugs-return-616972-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 13:59:30 2018
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Subject: [Bug libstdc++/87520] [8/9 Regression] ODR violations in std::make_shared when mixing -fno-rtti and -frtti
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Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-04
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
A possible (partial) fix would be:
--- a/libstdc++-v3/include/bits/shared_ptr_base.h
+++ b/libstdc++-v3/include/bits/shared_ptr_base.h
@@ -500,7 +500,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
struct _Sp_make_shared_tag
{
-#if !__cpp_rtti
private:
template<typename _Tp, _Lock_policy _Lp>
friend class __shared_ptr;
@@ -513,7 +512,6 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
alignas(type_info) static constexpr _Sp_make_shared_tag __tag;
return reinterpret_cast<const type_info&>(__tag);
}
-#endif
};
template<typename _Tp, typename _Alloc, _Lock_policy _Lp>
@@ -562,16 +560,19 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
this->~_Sp_counted_ptr_inplace();
}
- // Sneaky trick so __shared_ptr can get the managed pointer
+ // Sneaky trick so __shared_ptr can get the managed pointer.
virtual void*
- _M_get_deleter(const std::type_info& __ti) noexcept
+ _M_get_deleter(const std::type_info& __ti) noexcept override
{
-#if __cpp_rtti
- if (__ti == typeid(_Sp_make_shared_tag))
-#else
+ // Check for the fake type_info first, so we don't try to access it
+ // as a real type_info object.
if (&__ti == &_Sp_make_shared_tag::_S_ti())
-#endif
return const_cast<typename remove_cv<_Tp>::type*>(_M_ptr());
+#if __cpp_rtti
+ // Callers compiled with RTTI enabled pass this instead:
+ else if (__ti == typeid(_Sp_make_shared_tag))
+ return const_cast<typename remove_cv<_Tp>::type*>(_M_ptr());
+#endif
return nullptr;
}
@@ -1323,11 +1324,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
{
// _M_ptr needs to point to the newly constructed object.
// This relies on _Sp_counted_ptr_inplace::_M_get_deleter.
-#if __cpp_rtti
- void* __p = _M_refcount._M_get_deleter(typeid(__tag));
-#else
void* __p = _M_refcount._M_get_deleter(_Sp_make_shared_tag::_S_ti());
-#endif
_M_ptr = static_cast<_Tp*>(__p);
_M_enable_shared_from_this_with(_M_ptr);
}
This always passes the fake _S_ti() even when rtti is enabled. Inside
_M_get_deleter we check for the fake tag first, and so avoid trying to
dereference it as a real typeinfo object.
Old code already built with rtti could still call the function with
typeid(_Sp_make_shared_tag) and so we still need to check for that (which will
still fail and return a null pointer if the definition of _M_get_deleter is
built without rtti).
A more complete fix would be to avoid using the virtual _M_get_deleter
backchannel entirely, as suggested in PR 87514 (that would need to be done in
addition to the patch above, so that existing callers of the virtual function
will still be able to use it).
>From gcc-bugs-return-616973-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 14:02:48 2018
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--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
No, fails for so simple example as:
$ cat use2.f90
elemental real function sin(arg)
!GCC$ attributes FASTCALL :: sin
real, intent(in) :: arg
sin = -42.0
end function
program test_overloaded_intrinsic
real(4) :: x(3200), y(3200)
y = sin(x)
print *, y
end
$ gfortran use2.f90 -c
use2.f90:1:0:
elemental real function sin(arg)
Warning: ‘fastcall’ attribute ignored [-Wattributes]
>From gcc-bugs-return-616974-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 14:05:14 2018
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Subject: [Bug lto/87499] error: invalid conversion in gimple call for a nested function with lto
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
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Last reconfirmed| |2018-10-04
Ever confirmed|0 |1
--- Comment #2 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #1)
> I think the issue is an inconsistency between what types are considered local
> and thus we end up duplicating them but not merge them for canonical type
> compute. I think we have a duplicate for this.
Yes, now I see the reason. I was unable to find a dup.
>From gcc-bugs-return-616975-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 14:20:56 2018
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Subject: [Bug c++/56856] -Wformat warnings don't show location *within* format string in C++ FE
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |patch
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |dmalcolm at gcc dot gnu.org
--- Comment #10 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
Candidate patch: https://gcc.gnu.org/ml/gcc-patches/2018-10/msg00269.html
>From gcc-bugs-return-616976-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 14:37:35 2018
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Subject: [Bug ipa/82625] lower-optimization are not inlined with symbol multiversioning
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--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Thu Oct 4 14:36:55 2018
New Revision: 264845
URL: https://gcc.gnu.org/viewcvs?rev=264845&root=gcc&view=rev
Log:
Redirect call within specific target attribute among MV clones (PR ipa/82625).
2018-10-04 Martin Liska <mliska@suse.cz>
PR ipa/82625
* multiple_target.c (redirect_to_specific_clone): New function.
(ipa_target_clone): Use it.
* tree-inline.c: Fix comment.
2018-10-04 Martin Liska <mliska@suse.cz>
PR ipa/82625
* g++.dg/ext/pr82625.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/ext/pr82625.C
Modified:
trunk/gcc/ChangeLog
trunk/gcc/multiple_target.c
trunk/gcc/testsuite/ChangeLog
trunk/gcc/tree-inline.c
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Subject: [Bug ipa/82625] lower-optimization are not inlined with symbol multiversioning
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #6 from Martin Liška <marxin at gcc dot gnu.org> ---
Fixed.
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From: "marxin at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/87483] attribute alias accepted on a symbol definition
Date: Thu, 04 Oct 2018 14:45:00 -0000
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--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> ---
Author: marxin
Date: Thu Oct 4 14:44:53 2018
New Revision: 264846
URL: https://gcc.gnu.org/viewcvs?rev=264846&root=gcc&view=rev
Log:
Error about alias attribute with body definition (PR c/87483).
2018-10-04 Martin Liska <mliska@suse.cz>
PR c/87483
* cgraphunit.c (process_function_and_variable_attributes):
Warn about a function with alias attribute and a body.
2018-10-04 Martin Liska <mliska@suse.cz>
PR c/87483
* gcc.dg/pr87483.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr87483.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/cgraphunit.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c/87483] attribute alias accepted on a symbol definition
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Implemented.
>From gcc-bugs-return-616980-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 14:52:03 2018
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From: "romain.geissler at amadeus dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug debug/87362] GCC produces with LTO debug info with which gdb is not happy about
Date: Thu, 04 Oct 2018 14:52:00 -0000
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Romain Geissler <romain.geissler at amadeus dot com> changed:
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CC| |romain.geissler at amadeus dot com
--- Comment #18 from Romain Geissler <romain.geissler at amadeus dot com> ---
Hi,
Please note that I also hit the original issue in gdb when opening a binary
linked with LTO by gcc 8.2.1 20181003:
/workdir/src/gdb-8.2/gdb/dwarf2read.c:9715: internal-error: void
dw2_add_symbol_to_list(symbol*, pending**): Assertion `(*listhead) == NULL ||
(SYMBOL_LANGUAGE ((*listhead)->symbol[
0]) == SYMBOL_LANGUAGE (symbol))' failed.
A problem internal to GDB has been detected,
further debugging may prove unreliable.
Quit this debugging session? (y or n) [answered Y; input not from terminal]
Do yon think this patched applied on trunk shall be backported to gcc 8 ?
Cheers,
Romain
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Subject: [Bug libstdc++/87502] Poor code generation for std::string("c-style string")
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Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org,
| |marxin at gcc dot gnu.org
--- Comment #1 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to M Welinder from comment #0)
> Created attachment 44776 [details]
> Preprocessed source code
>
> It appears that gcc is creating quite poor code when "c-style strings"
> are used to construct std::string objects. Ideally, the result ought
> to be just a few move instructions for small strings.
>
>
> Host: Linux x86_64 4.4.140-62-default (OpenSuSE)
>
> Test code:
> ---------------------------------------------------------------
> #include <string>
>
> extern void foo (const std::string &);
>
> void
> bar ()
> {
> foo ("abc");
> foo (std::string("abc"));
> }
> ---------------------------------------------------------------
>
>
>
> # /usr/local/products/gcc/8.2.0/bin/g++ -std=gnu++1z -S -m32 -O3 ttt.C
> # grep 'call.*construct' ttt.s
> call
> _ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE12_M_constructIPKcEEvT_S
> 8_St20forward_iterator_tag.constprop.18
> call
> _ZNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEE12_M_constructIPKcEEvT_S
> 8_St20forward_iterator_tag.constprop.18
>
> Here gcc generates complete calls to the generic string construction
> even though the strings are constructed from small, known strings.
With -O2 -fdump-ipa-inline says:
function not declared inline and code size would grow
>
> "-std=gnu++1z" is important; "-m32" and "-O3" (as opposed to "-m64" and
> "-O2") are not.
With -O3 more inlining happens.
>
> # /usr/local/products/gcc/8.2.0/bin/g++ -S -m32 -O3 ttt.C
> # grep 'call.*construct' ttt.s
> # (nada)
>
> No calls -- good. In this case gcc generates this fragment:
>
> _Z3barv:
> .LFB1084:
> .cfi_startproc
> .cfi_personality 0,__gxx_personality_v0
> .cfi_lsda 0,.LLSDA1084
> pushl %ebp
> .cfi_def_cfa_offset 8
> .cfi_offset 5, -8
> movl $25185, %edx
> movl %esp, %ebp
> .cfi_def_cfa_register 5
> pushl %edi
> pushl %esi
> .cfi_offset 7, -12
> .cfi_offset 6, -16
> leal -48(%ebp), %esi
> pushl %ebx
> .cfi_offset 3, -20
> leal -40(%ebp), %ebx
> subl $56, %esp
> movl %ebx, -48(%ebp)
> pushl %esi
> movw %dx, -40(%ebp)
> movb $99, -38(%ebp)
> movl $3, -44(%ebp)
> movb $0, -37(%ebp)
> .LEHB6:
> .cfi_escape 0x2e,0x10
> call _Z3fooRKNSt7__cxx1112basic_stringIcSt11char_traitsIcESaIcEEE
> [...]
>
> This is better than a call, but not great:
> 1. The string is moved into position in three chunks (25185, 99, 0).
> This probably comes from inlined memcpy of 3 bytes, but the source
> is zero-terminated so rounding the memcpy size up to 4 would have
> been better.
Yes we end up with:
__builtin_memcpy (&D.30710.D.23004._M_local_buf, "abc", 3);
> 2. It's unclear why 25185 is passed through a register.
It's somehow connected to fact that constant are somehow expensive
on x86_64. Jakub can help here..
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From: "seurer at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/87486] [9 regression] gcc.target/powerpc/undef-bool-2.c fails starting with r264335
Date: Thu, 04 Oct 2018 15:06:00 -0000
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--- Comment #2 from seurer at gcc dot gnu.org ---
Author: seurer
Date: Thu Oct 4 15:05:32 2018
New Revision: 264847
URL: https://gcc.gnu.org/viewcvs?rev=264847&root=gcc&view=rev
Log:
[PATCH, rs6000] Fix expected error output for test case.
r264355 removed some spelling suggestions including for "bool" as used
in this test case.
Bootstrapped and tested on powerpc64le-unknown-linux-gnu and
powerpc64be-unknown-linux-gnu with no regressions. Is this ok for trunk?
2018-10-04 Bill Seurer <seurer@linux.vnet.ibm.com>
PR target/87486
* gcc.target/powerpc/undef-bool-2.c: Fix expected error output.
Index: gcc/testsuite/gcc.target/powerpc/undef-bool-2.c
===================================================================
--- gcc/testsuite/gcc.target/powerpc/undef-bool-2.c (revision 264812)
+++ gcc/testsuite/gcc.target/powerpc/undef-bool-2.c (working copy)
@@ -9,7 +9,7 @@
#include <xmmintrin.h>
-bool foo (int x) /* { dg-error "unknown type name 'bool'; did you mean
'_Bool'?" } */
+bool foo (int x) /* { dg-error "unknown type name 'bool'" } */
{
return x == 2;
}
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/powerpc/undef-bool-2.c
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Subject: [Bug c++/87515] "no return statement in function returning non-void" miscompiles with optimizations
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--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Note in c++, when there is no return, the code is undefined while in c, it is
only undefined if the return value is used.
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Subject: [Bug libstdc++/87520] [8/9 Regression] ODR violations in std::make_shared when mixing -fno-rtti and -frtti
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |egallager at gcc dot gnu.org
See Also| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=43105,
| |https://gcc.gnu.org/bugzill
| |a/show_bug.cgi?id=87514
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
Related to bug 43105
>From gcc-bugs-return-616985-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 16:32:49 2018
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From: "bruno.bugs.contact at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87521] New: [C++][ABI] Tail padding not reused for non POD struct with defaulted/deleted special member function as per Itanium ABI on x86-64
Date: Thu, 04 Oct 2018 16:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87521
Bug ID: 87521
Summary: [C++][ABI] Tail padding not reused for non POD struct
with defaulted/deleted special member function as per
Itanium ABI on x86-64
Product: gcc
Version: 8.2.0
Status: UNCONFIRMED
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Consider (https://godbolt.org/z/fSnWB1) (On x86-64)
struct Base {
unsigned x;
short y;
~Base() = default; // same with = delete
};
struct Der : Base {
short z;
};
With GCC sizeof(Der) == 12 instead of the expected 8.
The problem here (if I am reading the spec correctly)
is that the defaulted or deleted destructor qualifies
as user-declared, which makes Base a non-POD-struct
*as per C++03* (but not as per C++11),
which means that according to the Itanium ABI the tail padding
of Base should be reused. The same problem exists with the other
special member functions and with = delete instead.
This is not a recent problem and goes back to at least GCC 4.4.7,
which makes me think that this is maybe intended, but clang reuse
the tail padding in these cases which make this an annoying ABI
incompatibility. As an additional data point ICC seems to agree
with GCC on this.
>From gcc-bugs-return-616986-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 16:53:46 2018
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Subject: [Bug ipa/86395] add support of -fopt-info-inline in inliner
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David Malcolm <dmalcolm at gcc dot gnu.org> changed:
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--- Comment #3 from David Malcolm <dmalcolm at gcc dot gnu.org> ---
I'm looking at this.
>From gcc-bugs-return-616987-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 17:16:02 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/87522] New: LTO incorrectly merges target specific options
Date: Thu, 04 Oct 2018 17:16:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87522
Bug ID: 87522
Summary: LTO incorrectly merges target specific options
Product: gcc
Version: 9.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: lto
Assignee: unassigned at gcc dot gnu.org
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CC: marxin at gcc dot gnu.org
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[hjl@gnu-cfl-1 lto-test-functions]$ cat a.c
char a[32] = {};
void no_avx (void)
{
__builtin_memset(a, 0, sizeof(a));
}
[hjl@gnu-cfl-1 lto-test-functions]$ cat b.c
char b[32] = {};
void avx (void)
{
__builtin_memset(b, 0, sizeof(b));
}
[hjl@gnu-cfl-1 lto-test-functions]$ cat c.c
char c[32] = {};
void sse_only (void)
{
__builtin_memset(c, 0, sizeof(c));
}
[hjl@gnu-cfl-1 lto-test-functions]$ make
cc -O2 -fPIC -flto -g -mno-avx -c -o a.o a.c
cc -O2 -fPIC -flto -g -mavx -c -o b.o b.c
cc -shared -O2 -fPIC -flto -g -o lib1.so a.o b.o
cc -O2 -fPIC -flto -g -c -o c.o c.c
cc -shared -O2 -fPIC -flto -g -o lib2.so c.o b.o
[hjl@gnu-cfl-1 lto-test-functions]$
0000000000001100 <avx>:
1100: 48 8b 05 d1 2e 00 00 mov 0x2ed1(%rip),%rax # 3fd8
<b@@Base-0x88>
1107: c5 f9 ef c0 vpxor %xmm0,%xmm0,%xmm0
110b: c5 f8 29 00 vmovaps %xmm0,(%rax)
110f: c5 f8 29 40 10 vmovaps %xmm0,0x10(%rax)
1114: c3 retq
1115: 66 66 2e 0f 1f 84 00 00 00 00 00 data16 nopw
%cs:0x0(%rax,%rax,1)
0000000000001120 <no_avx>:
1120: 48 8b 05 c1 2e 00 00 mov 0x2ec1(%rip),%rax # 3fe8
<a@@Base-0x58>
1127: 66 0f ef c0 pxor %xmm0,%xmm0
112b: 0f 29 00 movaps %xmm0,(%rax)
112e: 0f 29 40 10 movaps %xmm0,0x10(%rax)
1132: c3 retq
no_avx has no AVX instructions.
0000000000001100 <avx>:
1100: 48 8b 05 d1 2e 00 00 mov 0x2ed1(%rip),%rax # 3fd8
<b@@Base-0x88>
1107: c5 f9 ef c0 vpxor %xmm0,%xmm0,%xmm0
110b: c5 f8 29 00 vmovaps %xmm0,(%rax)
110f: c5 f8 29 40 10 vmovaps %xmm0,0x10(%rax)
1114: c3 retq
1115: 66 66 2e 0f 1f 84 00 00 00 00 00 data16 nopw
%cs:0x0(%rax,%rax,1)
0000000000001120 <sse_only>:
1120: 48 8b 05 c1 2e 00 00 mov 0x2ec1(%rip),%rax # 3fe8
<c@@Base-0x58>
1127: c5 f9 ef c0 vpxor %xmm0,%xmm0,%xmm0
112b: c5 f8 29 00 vmovaps %xmm0,(%rax)
112f: c5 f8 29 40 10 vmovaps %xmm0,0x10(%rax)
1134: c3 retq
sse_only has AVX instructions.
>From gcc-bugs-return-616988-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 17:42:24 2018
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From: "hjl.tools at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug target/87522] LTO incorrectly merges target specific options
Date: Thu, 04 Oct 2018 17:42:00 -0000
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H.J. Lu <hjl.tools at gmail dot com> changed:
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----------------------------------------------------------------------------
CC| |ubizjak at gmail dot com
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--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
The problem is
gnu-user.h: "--32 %{!-:%{mavx:-msse2avx}} %{msse2avx:%{!mavx:-msse2avx}}"
LTO is OK. But -msse2avx turns SSE into AVX.
>From gcc-bugs-return-616989-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 17:47:07 2018
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug testsuite/87487] New test case gfortran.dg/deferred_character_24.f90 in r264721 fails on big endian
Date: Thu, 04 Oct 2018 17:47:00 -0000
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--- Comment #5 from seurer at gcc dot gnu.org ---
I tried it on a powerpc64 BE machine and it worked there too.
>From gcc-bugs-return-616990-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 17:55:17 2018
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From: "thiago at kde dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87522] LTO incorrectly merges target specific options
Date: Thu, 04 Oct 2018 17:55:00 -0000
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--- Comment #2 from Thiago Macieira <thiago at kde dot org> ---
In the original case, all sources were compiled with -march=westmere, though
some files had -mavx added.
>From gcc-bugs-return-616991-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 18:19:33 2018
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Subject: [Bug libstdc++/87502] Poor code generation for std::string("c-style string")
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--- Comment #2 from M Welinder <terra at gnome dot org> ---
Created attachment 44789
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44789&action=edit
Proof-on-concept patch
This proof-of-concept improves the situation dramatically. I don't
know if it is actually correct. This is done, in part, by not discarding
the fact that the source is zero-terminated.
With this patch I get the code I expect, mostly. For sizes 2 mod 4 I
still get the zero termination as a separate movb.
The destruction still stinks: the full destructor is inlined instead of
the small-string-only version (i.e., a no-op). Evidently gcc cannot
see that the string remains a small-string.
>From gcc-bugs-return-616992-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 19:12:11 2018
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82995
Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |wrong-code
Last reconfirmed|2017-11-14 00:00:00 |2018-10-4
--- Comment #7 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Part of the library part of this problem is in the following piece of code in
trans-expr.c (5632):
if (e && (fsym == NULL || fsym->attr.optional))
{
/* If an optional argument is itself an optional dummy argument,
check its presence and substitute a null if absent. This is
only needed when passing an array to an elemental procedure
as then array elements are accessed - or no NULL pointer is
allowed and a "1" or "0" should be passed if not present.
...
The comment (and the code which follows) is wrong for intrinsics
with an optional mask argument. Of course, the library would also
have to handle that, but that is easily done with code like
Index: ifunction.m4
===================================================================
--- ifunction.m4 (Revision 264540)
+++ ifunction.m4 (Arbeitskopie)
@@ -210,6 +210,15 @@
index_type mdelta;
int mask_kind;
+ if (mask->base_addr == NULL)
+ {
+#ifdef HAVE_BACK_ARG
+ name`'rtype_qual`_'atype_code (retarray, array, pdim, back);
+#else
+ name`'rtype_qual`_'atype_code (retarray, array, pdim);
+#endif
+ }
+
dim = (*pdim) - 1;
rank = GFC_DESCRIPTOR_RANK (array) - 1;
(or "if (mask == NULL)", depending on how this works out.
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From: "williamtnavarre at mail dot com" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/87523] New: ICE: Closures apparently fail to capture constexpr
Date: Thu, 04 Oct 2018 19:18:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87523
Bug ID: 87523
Summary: ICE: Closures apparently fail to capture constexpr
Product: gcc
Version: 7.3.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
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Possibly related to PR 86429?
It's not exactly the same because in this test case there is a failure even
though I'm not even demanding that the compiler necessarily consider the the
captured variable constexpr.
This is the full file below. No #include is required to observe the failing
behavior.
From g++ --version: g++ (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0
Command: g++ -std=c++17 inp.cpp
===
template <typename T, T v>
struct my_integer_constant {
constexpr my_integer_constant() {}
constexpr operator T() const { return v; }
constexpr T operator()() const { return v; }
};
template <typename T, T... u>
struct constant_call {
template <typename Callback>
static void call(T v, Callback f) {
char dummy[sizeof...(u)] = { ( (v == u) ? (f(my_integer_constant<T,
u>{}), static_cast<char>(0)) : static_cast<char>(0))... };
(void)dummy;
}
};
void f(bool reverse_in, bool other_bool_in) {
auto helper = [&] (auto reverse_t) {
bool constexpr reverse_v = reverse_t;
(void)reverse_v;
constant_call<bool, true, false>::call(other_bool_in,
[&] (auto newb) {
bool reverse_v_dyn =
reverse_v;
});
};
constant_call<bool, true, false>::call(reverse_in, [&] (auto reverse_t) {
helper(reverse_t);
});
}
===
Output includes:
./table/src/inp.cpp:23:57: internal compiler error: in tsubst_copy, at
cp/pt.c:14588
bool reverse_v_dyn =
reverse_v;
^~~~~~~~~~~~~
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Subject: [Bug fortran/82995] Segmentation fault passing optional argument to intrinsic sum function
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |ASSIGNED
Assignee|unassigned at gcc dot gnu.org |tkoenig at gcc dot gnu.org
--- Comment #8 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Let's give this a shot.
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Subject: [Bug fortran/82995] Segmentation fault passing optional argument to intrinsic sum function
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--- Comment #9 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Created attachment 44790
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44790&action=edit
This should take care of the library side...
or so I hope.
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Subject: [Bug middle-end/87524] New: inconsistent handling of attribute aligned between types and variables
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87524
Bug ID: 87524
Summary: inconsistent handling of attribute aligned between
types and variables
Product: gcc
Version: 9.0
Status: UNCONFIRMED
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When multiple instances of attribute aligned are applied to the declaration of
a variable the most restrictive instance wins.
But when multiple instances of attribute aligned are applied to the definition
of a type it's the last one that wins.
The attribute should have the same effect on all entities it applies to, i.e.,
functions, types, and variables.
$ cat x.c && gcc -S -Wall -fdump-tree-optimized=/dev/stdout x.c
#define A(N) __attribute__ ((aligned (N)))
void f0 (void)
{
A (2) A(4) char c4;
_Static_assert (_Alignof (c4) == 4, "_Alignof (c4) == 4");
}
void g0 (void)
{
A (4) A (2) char c4;
_Static_assert (_Alignof (c4) == 4, "_Alignof (c4) == 4");
}
void f1 (void)
{
typedef A (2) A (4) char C4;
_Static_assert (_Alignof (C4) == 4, "_Alignof (C4) == 4");
}
void g1 (void)
{
typedef A (4) A (2) char C4;
_Static_assert (_Alignof (C4) == 4, "_Alignof (C4) == 4");
}
x.c: In function ‘g1’:
x.c:25:3: error: static assertion failed: "_Alignof (C4) == 4"
25 | _Static_assert (_Alignof (C4) == 4, "_Alignof (C4) == 4");
| ^~~~~~~~~~~~~~
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Subject: [Bug libstdc++/87502] Poor code generation for std::string("c-style string")
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--- Comment #3 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to M Welinder from comment #2)
> The destruction still stinks: the full destructor is inlined instead of
> the small-string-only version (i.e., a no-op). Evidently gcc cannot
> see that the string remains a small-string.
void foo (const std::string &s){
const_cast<std::string&>(s)="some longer string so it needs proper deletion";
}
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Subject: [Bug c++/87519] -Wsign-conversion -Wconversion explicit cast fails to silence warning
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Manuel López-Ibáñez <manu at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |diagnostic
Status|UNCONFIRMED |NEW
Last reconfirmed| |2018-10-04
CC| |manu at gcc dot gnu.org
Summary|-Wsign-conversion |-Wsign-conversion
|erroneosly triggered when |-Wconversion explicit cast
|converting to auto-deduced |fails to silence warning
|interger type |
Ever confirmed|0 |1
--- Comment #7 from Manuel López-Ibáñez <manu at gcc dot gnu.org> ---
Nothing to do with deduced types:
typedef unsigned long int uint64_t ;
void f(unsigned long int a, int q) {
a = a + static_cast<uint64_t>(q);
}
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Subject: [Bug middle-end/63155] [6/7/8 Regression] memory hog
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--- Comment #35 from Rogério de Souza Moraes <rogerio.souza at gmail dot com> ---
Created attachment 44791
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44791&action=edit
Small testcase more similar to original environment
Hi Richard,
this is a new testcase, based on another file in the original environment. It’s
quite small (7000 lines, 240 setjmp calls).
This code with a little complex but still simplified control structure
represents state machine implementation, which is very widely used by our
customers. Another new factor is the nested setjmp calls. Of course, original
testcase is more complex and takes even more time with more difference.
You can run it using the following commands:
time gcc -DGCC -DLINUX_C -D_GLIBCXX_USE_CXX11_ABI=0 -m32 -m32 -w -c -O0
-pedantic -fwrapv -mstackrealign -mpreferred-stack-boundary=4
gcc_2nd_synth_pure_c_item.c -o gcc_2nd_synth_pure_c_item.o
time gcc -DGCC -DLINUX_C -D_GLIBCXX_USE_CXX11_ABI=0 -m32 -m32 -w -c -O
-pedantic -fwrapv -mstackrealign -mpreferred-stack-boundary=4
gcc_2nd_synth_pure_c_item.c -o gcc_2nd_synth_pure_c_item.o
Results :
GCC: 4.8.5 (From RHEL 7.5)
real 0m0.349s
user 0m0.255s
sys 0m0.083s
real 0m0.193s
user 0m0.163s
sys 0m0.023s
GCC: 6.3.0 (GCC 6.3.0 with Revision 264523 backported and applied to it)
real 0m32.235s
user 0m30.486s
sys 0m1.622s
real 3m34.203s
user 3m33.726s
sys 0m0.292s
The performance difference is relevant in this test.
Regards,
--
Rogerio
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Subject: [Bug c/87525] New: infinite loop generated for fread() if enabling -flto
Date: Thu, 04 Oct 2018 22:13:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87525
Bug ID: 87525
Summary: infinite loop generated for fread() if enabling -flto
Product: gcc
Version: 7.3.1
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c
Assignee: unassigned at gcc dot gnu.org
Reporter: taz.007 at zoho dot com
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Created attachment 44792
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44792&action=edit
screenshot of gdb with asm
When trying to compile flac with -flto enabled, it seems to generate an
infinite loop when the source code is calling fread();
If i remove the -flto flag, the generated code is no longer an infinite loop.
You can find in attachment a screenshot of the gdb screen with the faulty code.
Notice the loop at address 0xb7d16980
Also attached output of gcc -v -save-temps
>From gcc-bugs-return-617001-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 22:16:09 2018
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Subject: [Bug c/87525] infinite loop generated for fread() if enabling -flto
Date: Thu, 04 Oct 2018 22:16:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87525
--- Comment #1 from taz.007 at zoho dot com ---
Created attachment 44793
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44793&action=edit
text output of gcc -v -save-temps
>From gcc-bugs-return-617002-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 22:19:33 2018
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Subject: [Bug c/87525] infinite loop generated for fread() if enabling -flto
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87525
--- Comment #2 from taz.007 at zoho dot com ---
Created attachment 44794
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44794&action=edit
preprocessed source
>From gcc-bugs-return-617003-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 22:55:42 2018
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/87525] infinite loop generated for fread() if enabling -flto and -D_FORTIFY_SOURCE=2
Date: Thu, 04 Oct 2018 22:55:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87525
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|infinite loop generated for |infinite loop generated for
|fread() if enabling -flto |fread() if enabling -flto
| |and -D_FORTIFY_SOURCE=2
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This smells like a GNU extern inline issue.
>From gcc-bugs-return-617004-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 22:59:55 2018
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug lto/87525] infinite loop generated for fread() if enabling -flto and -D_FORTIFY_SOURCE=2
Date: Thu, 04 Oct 2018 22:59:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Depends on| |61886
--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Hmm, this seems similar to PR 61886.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61886
[Bug 61886] [4.9/5/6 Regression] LTO breaks fread with _FORTIFY_SOURCE=2
>From gcc-bugs-return-617005-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 23:06:10 2018
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Subject: [Bug libstdc++/54005] Use __atomic_always_lock_free in libstdc++ is_lock_free instead of __atomic_is_lock_free
Date: Thu, 04 Oct 2018 23:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=54005
--- Comment #22 from Hans-Peter Nilsson <hp at gcc dot gnu.org> ---
The issue again, is using properties of the actual object in the value of
is_lock_free().
AFAICS, that still happens (at r264855)
libstdc++-v3/include/bits/atomic_base.h:246
static constexpr int _S_alignment =
sizeof(_ITp) > alignof(_ITp) ? sizeof(_ITp) : alignof(_ITp);
alignas(_S_alignment) __int_type _M_i;
libstdc++-v3/include/bits/atomic_base.h:353
bool
is_lock_free() const noexcept
{
// Use a fake, minimally aligned pointer.
return __atomic_is_lock_free(sizeof(_M_i),
reinterpret_cast<void *>(-__alignof(_M_i)));
}
To me, is_lock_free doesn't seem to be constant over all objects of
the same type, when the expression to __atomic_is_lock_free is based
on the particular object; the fake-pointer (void*) -__alignof(_M_i).
Or do I misread that? Are __alignof(x) and the result of alignas(x)
in the declaration guaranteed to always be the same here? This seems
to be the crux. (If so, can we add an assert somehow to make this
clearer?)
Anyway, as per the arguments in n2992.html in the link above, I (still) think
__atomic_*always*_lock free should be used instead; this'd make the intent
clear.
>From gcc-bugs-return-617006-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Thu Oct 04 23:09:15 2018
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Subject: [Bug libstdc++/54005] Use __atomic_always_lock_free in libstdc++ is_lock_free instead of __atomic_is_lock_free
Date: Thu, 04 Oct 2018 23:09:00 -0000
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--- Comment #23 from Hans-Peter Nilsson <hp at gcc dot gnu.org> ---
(In reply to Hans-Peter Nilsson from comment #22)
> Anyway, as per the arguments in n2992.html in the link above, I (still)
> think __atomic_*always*_lock free should be used instead; this'd make the
> intent clear.
...and also, a call might be generated as the result of using
__atomic_is_lock_free (instead of __atomic_always_lock_free), so the target may
change its mind. Not good.
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From: "msebor at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/87526] New: attribute alias ignored on a local declaration of an extern function
Date: Thu, 04 Oct 2018 23:59:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87526
Bug ID: 87526
Summary: attribute alias ignored on a local declaration of an
extern function
Product: gcc
Version: 9.0
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GCC accepts extern declarations of aliases at file scope but complains for such
declarations at local scope:
$ cat x.c && gcc -S -Wall x.c
void f (void) { }
extern __attribute ((alias ("f"))) void f1 (void);
void g (void)
{
extern __attribute ((alias ("f"))) void f2 (void);
}
x.c: In function ‘g’:
x.c:7:3: warning: ‘alias’ attribute ignored [-Wattributes]
7 | extern __attribute ((alias ("f"))) void f2 (void);
| ^~~~~~
The following comment above the block that normally processes the attribute
suggests that the distinction might be an unintended result of some sort of a
hack that has been perhaps been removed (the function doesn't use
DECL_EXTERNAL).
/* Note that the very first time we process a nested declaration,
decl_function_context will not be set. Indeed, *would* never
be set except for the DECL_INITIAL/DECL_EXTERNAL frobbery that
we do below. After such frobbery, pushdecl would set the context.
In any case, this is never what we want. */
else if (decl_function_context (decl) == 0 && current_function_decl == NULL)
>From gcc-bugs-return-617008-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 02:32:26 2018
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |dmalcolm at gcc dot gnu.org,
| |dodji at gcc dot gnu.org
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
cc-ing diagnostics maintainers
>From gcc-bugs-return-617009-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 02:43:11 2018
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Subject: [Bug tree-optimization/84824] DCE fails to remove dead code of std::function constructor
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--- Comment #18 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to linzj from comment #16)
> Created attachment 43783 [details]
> This patch trying simulate a local escaped node for function call.
>
> This patch trying simulate a local escaped node for function call. Thus all
> function call get the correct clobber/use set.
(In reply to linzj from comment #17)
> After this patch the code still have redundant calls for the inline pass
> has finished. But the indirect function calls has been removed.
Please submit the patch to the gcc-patches mailing list for review
>From gcc-bugs-return-617010-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 02:49:49 2018
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Subject: [Bug c/46742] -Wparentheses unexpectedly misses some cases [-Wbool-bitwise-parentheses]
Date: Fri, 05 Oct 2018 02:49:00 -0000
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Eric Gallager <egallager at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Blocks| |87403
Summary|-Wparentheses unexpectedly |-Wparentheses unexpectedly
|misses some cases |misses some cases
| |[-Wbool-bitwise-parentheses
| |]
--- Comment #6 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Franz Sirl from comment #5)
> Actually, after seeing a large bunch of justified warnings in our codebase
> with the disabled APPEARS_TO_BE_BOOLEAN_EXPR_P check, I wonder if a new
> option like -Wbool-bitwise-parentheses (thus not depending on the logical
> NOT) would make sense?
>
> Note that this is heavily influenced by my code reading/code debugging POV,
> I really hate it if I need lots of context to decide whether a statement in
> a codebase unknown to me is correct or not. A warning like
> -Wbool-bitwise-parentheses encourages programmers to make their intention
> clear from the start. Or, in the best case, even uncovers coding bugs or
> typos early.
Making this block the "new-warning" bug then
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87403
[Bug 87403] [Meta-bug] Issues that suggest a new warning
>From gcc-bugs-return-617011-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 02:53:47 2018
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Subject: [Bug target/51797] Arm backend missed the mls related optimization
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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Assignee|sameerad at gcc dot gnu.org |unassigned at gcc dot gnu.org
--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #1)
> Should sameerad remain the assignee for this?
No reply; unassigning
>From gcc-bugs-return-617012-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 02:57:29 2018
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Subject: [Bug bootstrap/31151] During 'make bootstrap': Syntax error at line 1 : `>' is not expected
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #3)
> Does this still happen with newer versions of gcc?
No reply; closing. Feel free to reopen if it still happens.
>From gcc-bugs-return-617013-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 02:59:59 2018
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Subject: [Bug bootstrap/30341] Makefile using mv instead of ln not working on WinXP Cygwin Bash
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #6 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #5)
> (In reply to Rob from comment #4)
> > I have found that with very low system load that it _can_ occur using an
> > XTerm window afterall - infrequently.
> >
> > If your compiling for Cygwin it is best to make the mod to the Makefile.
>
> ...so... is that still the case with newer versions of GCC?
No reply, guessing things are ok now. Feel free to reopen if necessary.
>From gcc-bugs-return-617014-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 03:01:52 2018
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Subject: [Bug bootstrap/32556] The libgcc configuration file doesn't swap CPP when it swaps CC - use of normal value breaks make
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #2 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #1)
> Does this still happen with newer versions of GCC?
Guess not; closing. Feel free to reopen if it does still happen.
>From gcc-bugs-return-617015-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 03:02:14 2018
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Subject: [Bug bootstrap/33065] warning in Comparing stages 2 and 3 stage3-gcc: No such file or directory (objdir==srcdir)
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Eric Gallager <egallager at gcc dot gnu.org> changed:
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--- Comment #10 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Eric Gallager from comment #9)
> (In reply to Andrew Pinski from comment #8)
> > >Bootstrap comparison failure!
> > >./ada/exp_aggr.o differs
> > >make[2]: *** [compare] Error 1
> >
> >
> > This was PR 32941 and has been fixed on the trunk.
>
> So... is this fixed too then?
Guess so.
>From gcc-bugs-return-617016-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 03:03:23 2018
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Subject: [Bug bootstrap/31235] Bootstrap comparison failure with -gstabs
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--- Comment #4 from Eric Gallager <egallager at gcc dot gnu.org> ---
(In reply to Jim Wilson from comment #3)
> Created attachment 13305 [details]
> Mark array TYPE_DOMAIN as used to prevent garbage collection.
>
> This has been tested with a C only BOOT_CFLAGS=-gstabs bootstrap. It needs
> a full bootstrap, gcc testsuite run, and gdb testsuite run.
Please submit to gcc-patches for review if it still applies.
>From gcc-bugs-return-617017-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 07:02:34 2018
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Subject: [Bug testsuite/87487] New test case gfortran.dg/deferred_character_24.f90 in r264721 fails on big endian
Date: Fri, 05 Oct 2018 07:02:00 -0000
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--- Comment #6 from Paul Thomas <pault at gcc dot gnu.org> ---
Author: pault
Date: Fri Oct 5 07:01:57 2018
New Revision: 264862
URL: https://gcc.gnu.org/viewcvs?rev=264862&root=gcc&view=rev
Log:
2018-10-05 Paul Thomas <pault@gcc.gnu.org>
PR fortran/87487
* trans-decl.c (gfc_get_symbol_decl): Make sure that deferred
character length pointer initializer has the right type to fix
problem with deferred_character_24.f90 on big endian.
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/trans-decl.c
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Subject: [Bug libstdc++/87502] Poor code generation for std::string("c-style string")
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Martin Liška <marxin at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |redi at gcc dot gnu.org
--- Comment #4 from Martin Liška <marxin at gcc dot gnu.org> ---
Ccing Jonathan, libstdc++ maintainer.
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Subject: [Bug testsuite/87487] New test case gfortran.dg/deferred_character_24.f90 in r264721 fails on big endian
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Paul Thomas <pault at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Resolution|--- |FIXED
--- Comment #7 from Paul Thomas <pault at gcc dot gnu.org> ---
Thanks for flagging the problem up and confirming the fix so promptly.
Fixed.
Paul
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Subject: [Bug lto/87525] infinite loop generated for fread() if enabling -flto and -D_FORTIFY_SOURCE=2
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Martin Liška <marxin at gcc dot gnu.org> changed:
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--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
Can you please advise how to build the flac package and how to run a test that
spins in an infinite loop?
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Subject: [Bug libstdc++/87502] Poor code generation for std::string("c-style string")
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--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The C++17 calling a function part of this issue is record as PR 86590 already.
The rest is a different issue and should be looked into.
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Subject: [Bug libstdc++/87520] [8/9 Regression] ODR violations in std::make_shared when mixing -fno-rtti and -frtti
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Richard Biener <rguenth at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Subject: [Bug middle-end/63155] [6/7/8 Regression] memory hog
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--- Comment #36 from rguenther at suse dot de <rguenther at suse dot de> ---
On Thu, 4 Oct 2018, rogerio.souza at gmail dot com wrote:
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63155
>
> --- Comment #35 from Rogério de Souza Moraes <rogerio.souza at gmail dot com> ---
> Created attachment 44791
> --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44791&action=edit
> Small testcase more similar to original environment
>
> Hi Richard,
>
> this is a new testcase, based on another file in the original environment. It’s
> quite small (7000 lines, 240 setjmp calls).
>
> This code with a little complex but still simplified control structure
> represents state machine implementation, which is very widely used by our
> customers. Another new factor is the nested setjmp calls. Of course, original
> testcase is more complex and takes even more time with more difference.
>
> You can run it using the following commands:
>
>
> time gcc -DGCC -DLINUX_C -D_GLIBCXX_USE_CXX11_ABI=0 -m32 -m32 -w -c -O0
> -pedantic -fwrapv -mstackrealign -mpreferred-stack-boundary=4
> gcc_2nd_synth_pure_c_item.c -o gcc_2nd_synth_pure_c_item.o
>
> time gcc -DGCC -DLINUX_C -D_GLIBCXX_USE_CXX11_ABI=0 -m32 -m32 -w -c -O
> -pedantic -fwrapv -mstackrealign -mpreferred-stack-boundary=4
> gcc_2nd_synth_pure_c_item.c -o gcc_2nd_synth_pure_c_item.o
>
>
> Results :
>
> GCC: 4.8.5 (From RHEL 7.5)
>
> real 0m0.349s
> user 0m0.255s
> sys 0m0.083s
>
> real 0m0.193s
> user 0m0.163s
> sys 0m0.023s
>
> GCC: 6.3.0 (GCC 6.3.0 with Revision 264523 backported and applied to it)
>
> real 0m32.235s
> user 0m30.486s
> sys 0m1.622s
>
> real 3m34.203s
> user 3m33.726s
> sys 0m0.292s
>
> The performance difference is relevant in this test.
Thanks for the more realistic testcase. I can confirm the above
and I also see a slowdown in GCC 9 compared to GCC 8 at -O1:
> /usr//bin/time gcc-8 -S t.c -O -fwrapv -mstackrealign
-mpreferred-stack-boundary=4 -m32
157.48user 0.24system 2:37.78elapsed 99%CPU (0avgtext+0avgdata
888036maxresident)k
47704inputs+152outputs (8major+240936minor)pagefaults 0swaps
> /usr//bin/time gcc-9 -S t.c -O -fwrapv -mstackrealign
-mpreferred-stack-boundary=4 -m32
197.61user 0.39system 3:18.08elapsed 99%CPU (0avgtext+0avgdata
890628maxresident)k
0inputs+184outputs (0major+259016minor)pagefaults 0swaps
Somehow it's still CCP that makes things slow:
tree CCP : 178.52 ( 89%) 0.01 ( 2%) 178.55 (
89%) 646 kB ( 0%)
perf tells me it's
- 96.33% 29.55% 14801 cc1 cc1 [.]
ccp_propagate::visit_phi â–’
ccp_propagate::visit_phi
â–’
- ssa_propagation_engine::simulate_stmt
â–’
+ 49.51% ssa_propagation_engine::simulate_block
â–’
+ 46.82% ssa_propagation_engine::ssa_propagate
- 37.06% 28.98% 12421 cc1 cc1 [.]
ccp_lattice_meet â–’
- ccp_lattice_meet
â–’
+ 37.02% ccp_propagate::visit_phi
â–’
+ 0.03% set_lattice_value
- 5.17% 5.17% 1949 cc1 cc1 [.]
wi::bit_or<generic_wide_int<fixed_wide_int_storage<192> >, generic_wâ–’
wi::bit_or<generic_wide_int<fixed_wide_int_storage<192> >,
generic_wide_int<fixed_wide_int_storage<192> > > â–’
- ccp_lattice_meet
â–’
+ 5.16% ccp_propagate::visit_phi
â–’
+ 0.01% set_lattice_value
- 4.02% 4.02% 1509 cc1 cc1 [.]
canonicalize_value â–’
- canonicalize_value
â–’
+ 4.02% get_value_for_expr
â–’
+ 0.00% ccp_folder::get_value
- 2.90% 2.89% 1083 cc1 cc1 [.]
wi::eq_p<generic_wide_int<fixed_wide_int_storage<192> >, int> â–’
wi::eq_p<generic_wide_int<fixed_wide_int_storage<192> >, int>
â–’
- ccp_lattice_meet
â–’
+ 2.89% ccp_propagate::visit_phi
â–’
+ 0.00% set_lattice_value
As said, thanks for the testcase.
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Subject: [Bug c++/71128] [concepts] ICE on ill-formed explicit instantiation of a function concept
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Paolo Carlini <paolo.carlini at oracle dot com> changed:
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----------------------------------------------------------------------------
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--- Comment #1 from Paolo Carlini <paolo.carlini at oracle dot com> ---
Mine.
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Subject: [Bug fortran/80524] [F03] Problematic behaviour with a finalization subroutine in gfortran
Date: Fri, 05 Oct 2018 09:26:00 -0000
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--- Comment #7 from Jürgen Reuter <juergen.reuter at desy dot de> ---
This is still present in the actual trunk.
>From gcc-bugs-return-617026-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 09:54:29 2018
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Subject: [Bug libstdc++/54005] Use __atomic_always_lock_free in libstdc++ is_lock_free instead of __atomic_is_lock_free
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--- Comment #24 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Hans-Peter Nilsson from comment #22)
> Or do I misread that? Are __alignof(x) and the result of alignas(x)
> in the declaration guaranteed to always be the same here?
Yes.
>From gcc-bugs-return-617027-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 10:03:14 2018
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Subject: [Bug libstdc++/54005] Use __atomic_always_lock_free in libstdc++ is_lock_free instead of __atomic_is_lock_free
Date: Fri, 05 Oct 2018 10:03:00 -0000
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--- Comment #25 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Hans-Peter Nilsson from comment #23)
> ...and also, a call might be generated as the result of using
> __atomic_is_lock_free (instead of __atomic_always_lock_free), so the target
> may change its mind. Not good.
That should have been fixed by r227878 for Bug 65913 so that for these cases no
call is generated.
Without a testcase showing the wrong thing happening, I still think the right
thing happens here.
>From gcc-bugs-return-617028-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 10:18:39 2018
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Subject: [Bug fortran/58618] Wrong code with character substring and ASSOCIATE
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Jürgen Reuter <juergen.reuter at desy dot de> changed:
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--- Comment #6 from Jürgen Reuter <juergen.reuter at desy dot de> ---
Still present in the current trunk as of r264725.
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Subject: [Bug fortran/87127] External function not recognised from within an associate block
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--- Comment #1 from Jürgen Reuter <juergen.reuter at desy dot de> ---
Present since at least version 5.4. It is still present in the very recent
trunk (r264725).
>From gcc-bugs-return-617030-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 10:36:07 2018
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Subject: [Bug fortran/87127] External function not recognised from within an associate block
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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--- Comment #2 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Present since at least version 5.4. It is still present in the very
> recent trunk (r264725).
Also present in 4.8 and 4.9.
>From gcc-bugs-return-617031-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 10:41:40 2018
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Subject: [Bug fortran/58618] Wrong code with character substring and ASSOCIATE
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--- Comment #7 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
> Still present in the current trunk as of r264725.
If the PR has not been marked as fixed, such post is just adding noise!-(
>From gcc-bugs-return-617032-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 10:42:29 2018
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Subject: [Bug fortran/87477] [meta-bug] [F03] issues concerning the ASSOCIATE statement
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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--- Comment #1 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Marking as NEW.
>From gcc-bugs-return-617033-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 10:46:13 2018
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Subject: [Bug fortran/87449] -Wunused-variable and associate
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Dominique d'Humieres <dominiq at lps dot ens.fr> changed:
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--- Comment #4 from Dominique d'Humieres <dominiq at lps dot ens.fr> ---
Confirmed from at least 4.8 up to trunk (9.0).
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From: "segher at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87509] ICE in extract_insn, at recog.c:2305
Date: Fri, 05 Oct 2018 10:53:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87509
--- Comment #2 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Author: segher
Date: Fri Oct 5 10:52:33 2018
New Revision: 264863
URL: https://gcc.gnu.org/viewcvs?rev=264863&root=gcc&view=rev
Log:
rs6000: Various fixes for the new fpscr builtins (PR87509)
With these fixes all testcases test clean for me, both on
powerpc64-linux {-m32,-m64} and on powerpc64le-linux, with all
relevant -mcpu= settings.
PR target/87509
* config/rs6000/rs6000-builtin.def (RS6000_BUILTIN_SET_FPSCR_DRN): Use
RS6000_BTM_DFP.
* config/rs6000/rs6000.md (rs6000_set_fpscr_rn): Require the operand
to be DImode. When using mffscrn, force the operand to a register.
gcc/testsuite/
PR target/87509
* gcc.target/powerpc/test_fpscr_drn_builtin.c: Use hard_dfp instead
of dfp_hw. Don't include <altivec.h>.
* gcc.target/powerpc/test_fpscr_drn_builtin_error.c: Ditto. Require
lp64.
* gcc.target/powerpc/test_fpscr_rn_builtin.c: Don't include
<altivec.h>.
* gcc.target/powerpc/test_fpscr_rn_builtin_error.c: Ditto.
* gcc.target/powerpc/test_mffsl.c: Ditto.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/rs6000/rs6000-builtin.def
trunk/gcc/config/rs6000/rs6000.md
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/powerpc/test_fpscr_drn_builtin.c
trunk/gcc/testsuite/gcc.target/powerpc/test_fpscr_drn_builtin_error.c
trunk/gcc/testsuite/gcc.target/powerpc/test_fpscr_rn_builtin.c
trunk/gcc/testsuite/gcc.target/powerpc/test_fpscr_rn_builtin_error.c
trunk/gcc/testsuite/gcc.target/powerpc/test_mffsl.c
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Subject: [Bug target/87522] LTO incorrectly merges target specific options
Date: Fri, 05 Oct 2018 11:30:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87522
--- Comment #3 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Fri Oct 5 11:29:44 2018
New Revision: 264864
URL: https://gcc.gnu.org/viewcvs?rev=264864&root=gcc&view=rev
Log:
i386: Don't pass -msse2avx to assembler for -mavx
With
gcc -O2 -fPIC -flto -g -c -o a.o a.c
gcc -O2 -fPIC -flto -g -mavx -c -o b.o b.c
gcc -shared -O2 -fPIC -flto -g -o lib1.so a.o b.o
LTO correctly generates AVX for b.o and SSE for a.o. But the GCC driver
passes -msse2avx to assembler, which encodes SSE instructions as AVX
instructions. We shouldn't pass -msse2avx to assembler for -mavx.
PR target/87522
* config/i386/gnu-user.h (ASM_SPEC): Don't pass -msse2avx to
assembler for -mavx.
* config/i386/gnu-user64.h (ASM_SPEC): Likewise.
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/gnu-user.h
trunk/gcc/config/i386/gnu-user64.h
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Subject: [Bug target/87522] LTO incorrectly merges target specific options
Date: Fri, 05 Oct 2018 11:32:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87522
--- Comment #4 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Fri Oct 5 11:31:45 2018
New Revision: 264865
URL: https://gcc.gnu.org/viewcvs?rev=264865&root=gcc&view=rev
Log:
i386: Don't pass -msse2avx to assembler for -mavx
With
gcc -O2 -fPIC -flto -g -c -o a.o a.c
gcc -O2 -fPIC -flto -g -mavx -c -o b.o b.c
gcc -shared -O2 -fPIC -flto -g -o lib1.so a.o b.o
LTO correctly generates AVX for b.o and SSE for a.o. But the GCC driver
passes -msse2avx to assembler, which encodes SSE instructions as AVX
instructions. We shouldn't pass -msse2avx to assembler for -mavx.
Backport from mainline
PR target/87522
* config/i386/gnu-user.h (ASM_SPEC): Don't pass -msse2avx to
assembler for -mavx.
* config/i386/gnu-user64.h (ASM_SPEC): Likewise.
Modified:
branches/gcc-8-branch/gcc/ChangeLog
branches/gcc-8-branch/gcc/config/i386/gnu-user.h
branches/gcc-8-branch/gcc/config/i386/gnu-user64.h
>From gcc-bugs-return-617037-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Fri Oct 05 11:41:35 2018
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From: "hjl at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/87522] LTO incorrectly merges target specific options
Date: Fri, 05 Oct 2018 11:41:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87522
--- Comment #5 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Fri Oct 5 11:40:59 2018
New Revision: 264867
URL: https://gcc.gnu.org/viewcvs?rev=264867&root=gcc&view=rev
Log:
i386: Don't pass -msse2avx to assembler for -mavx
With
gcc -O2 -fPIC -flto -g -c -o a.o a.c
gcc -O2 -fPIC -flto -g -mavx -c -o b.o b.c
gcc -shared -O2 -fPIC -flto -g -o lib1.so a.o b.o
LTO correctly generates AVX for b.o and SSE for a.o. But the GCC driver
passes -msse2avx to assembler, which encodes SSE instructions as AVX
instructions. We shouldn't pass -msse2avx to assembler for -mavx.
Backport from mainline
PR target/87522
* config/i386/gnu-user.h (ASM_SPEC): Don't pass -msse2avx to
assembler for -mavx.
* config/i386/gnu-user64.h (ASM_SPEC): Likewise.
Modified:
branches/gcc-7-branch/gcc/ChangeLog
branches/gcc-7-branch/gcc/config/i386/gnu-user.h
branches/gcc-7-branch/gcc/config/i386/gnu-user64.h
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Subject: [Bug target/87522] LTO incorrectly merges target specific options
Date: Fri, 05 Oct 2018 11:45:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87522
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |FIXED
Target Milestone|--- |9.0
--- Comment #6 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for GCC 9, GCC 8.3 and GCC 7.4.
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From: "terra at gnome dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/87502] Poor code generation for std::string("c-style string")
Date: Fri, 05 Oct 2018 12:17:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87502
--- Comment #6 from M Welinder <terra at gnome dot org> ---
> const_cast<std::string&>(s)="some longer string so it needs proper deletion";
Is that really valid?
This comes down to whether the temporary object creating with the function
call is constant [in which case the above is UB] or not [in which case the
above is perfectly fine].
If I am reading http://cpp14.centaur.ath.cx/dcl.init.ref.html right then
the object is created with the const/volatile specifiers of the argument
type, in this case const. If so, such an object must not be changed.
Just in case I am reading it wrong, I still say the generated code is
excessive. gcc creates 16 instructions that, among other things, check
the _S_force_new flag. Most of those instructions will never be executed
in practice. I think the generated code, at least for the
temporary-from-small-string case, should simply be
movq (%rsp), %rdi
leaq 16(%rsp), %rax
cmpq %rax, %rdi ;; check if buffer is allocated
je .L42
call do_the_complicated_thing
.L42:
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Subject: GCC for AArch64 never emits CFI in debug_frame
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Hello
I've noticed that for C++ translation unit GCC for aarch64 always
emits CFI into eh_frame but never debug_frame even if debug
information is enabled. Tried on GCC versions 6 to 8.
DWARF for the ARM 64-bit architecture (AArch64) states that it must be
debug_frame ((https://static.docs.arm.com/ihi0057/b/IHI0057B_aadwarf64.pdf)
GAS supports emitting CFI to both sections by directive: .cfi_sections
.debug_frame,.eh_frame
At the same time gcc for arm emits CFI in both debug_frame and .ARM.exidx
I'm aware about CFI for Exception Handling. But what the reason to not
emit both ?
Is there any implicit reason for that or it's just a bug ?
Steps to reproduce:
cat > test.cpp <<EOF
int foo() {
return 0;
}
EOF
./aarch64-none-elf-gcc -c -g test.cpp -o test_cpp.o &&
./aarch64-none-elf-objdump -g test_cpp.o | grep -B 3 "CIE" | grep
"_frame"
Contents of the .eh_frame section:
While for C code it does:
cat > test.c <<EOF
int foo() {
return 0;
}
EOF
./aarch64-none-elf-gcc -c -g test.c -o test_c.o &&
./aarch64-none-elf-objdump -g test_c.o | grep -B 3 "CIE" | grep
"_frame"
Contents of the .debug_frame section:
Alex
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2018-09-25 23:16 [Bug c++/87437] New: g++ ICE Segfault initializing implicitly sized array in template with enum index james at albanarts dot com
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