[Bug target/65780] [5 Regression] Uninitialized common handling in executables

["evstupac at gmail dot com" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65780

Stupachenko Evgeny <evstupac at gmail dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |evstupac at gmail dot com

--- Comment #47 from Stupachenko Evgeny <evstupac at gmail dot com> ---
The patch caused significant regressions (see below) on spec2000 INT benchmarks
compiled with options “-fPIE -pie -O2 -ffast-math -mfpmath=sse -m32
-march=corei7-avx” or “-fPIE -pie -O2 -ffast-math -mfpmath=sse -m32
-march=slm”.

Sandybridge:
164.gzip    1635.0000  1602.0000 -2.01% 
197.parser  2159.0000  2117.0000 -1.94% 
254.gap     2909.0000  2886.0000 -0.79% 
256.bzip2   2232.0000  2154.0000 -3.49%

Silvermont:
164.gzip     964.0000   945.0000 -1.97% 
197.parser   951.0000   940.0000 -1.15% 
254.gap     1328.0000  1296.0000 -2.40% 
256.bzip2    952.0000   898.0000 -5.67%
>From gcc-bugs-return-484183-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Tue Apr 21 14:15:18 2015
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From: "mm at mezzarobba dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/65833] New: Attempting to convert 128 bit integers to 128 bit decimal floating-point results in an unresolved symbol
Date: Tue, 21 Apr 2015 14:15:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?ide833

            Bug ID: 65833
           Summary: Attempting to convert 128 bit integers to 128 bit
                    decimal floating-point results in an unresolved symbol
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mm at mezzarobba dot net
                CC: christoph.lauter at lip6 dot fr

The following code

$ cat stitd.c
int main(void) {
    __uint128_t foo = 42;
    _Decimal128 bar = foo;
    (void) bar;
    return 0;
}

fails to link with

$ gcc -Wall -Wextra -std=gnu11 stitd.c
/tmp/ccY4noUz.o: In function `main':
stitd.c:(.text+0x27): undefined reference to `__bid_floatunstitd'
collect2: error: ld returned 1 exit status
(exit 1)

Changing __uint128_t to __int128_t results in a similar error. Replacing
_Decimal128 by __float128 works.

~/docs/vrac/c$ gcc -v --version
Using built-in specs.
COLLECT_GCC=/usr/bin/gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.9/lto-wrapper
gcc (Debian 4.9.2-10) 4.9.2
Copyright (C) 2014 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.


Target: x86_64-linux-gnu
Configured with: ../src/configure -v --with-pkgversion='Debian 4.9.2-10'
--with-bugurl=file:///usr/share/doc/gcc-4.9/README.Bugs
--enable-languages=c,c++,java,go,d,fortran,objc,obj-c++ --prefix=/usr
--program-suffix=-4.9 --enable-shared --enable-linker-build-id
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--with-gxx-include-dir=/usr/include/c++/4.9 --libdir=/usr/lib --enable-nls
--with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug
--enable-libstdcxx-time=yes --enable-gnu-unique-object --disable-vtable-verify
--enable-plugin --with-system-zlib --disable-browser-plugin
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--with-jvm-jar-dir=/usr/lib/jvm-exports/java-1.5.0-gcj-4.9-amd64
--with-arch-directory=amd64 --with-ecj-jar=/usr/share/java/eclipse-ecj.jar
--enable-objc-gc --enable-multiarch --with-arch-32=i586 --with-abi=m64
--with-multilib-list=m32,m64,mx32 --enable-multilib --with-tune=generic
--enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
--target=x86_64-linux-gnu
Thread model: posix
gcc version 4.9.2 (Debian 4.9.2-10)
COLLECT_GCC_OPTIONS='-v' '--version' '-mtune=generic' '-march=x86-64'
 /usr/lib/gcc/x86_64-linux-gnu/4.9/cc1 -quiet -v -imultiarch x86_64-linux-gnu
help-dummy -quiet -dumpbase help-dummy -mtune=generic -march=x86-64 -auxbase
help-dummy -version --version -o /tmp/cc2dxKl2.s
GNU C (Debian 4.9.2-10) version 4.9.2 (x86_64-linux-gnu)
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3.1.2-p3, MPC version 1.0.2
warning: MPFR header version 3.1.2-p3 differs from library version 3.1.2-p11.
warning: MPC header version 1.0.2 differs from library version 1.0.3.
GGC heuristics: --param ggc-min-expand\x100 --param ggc-min-heapsize\x131072
COLLECT_GCC_OPTIONS='-v' '--version' '-mtune=generic' '-march=x86-64'
 as -v --64 --version -o /tmp/ccNgVCKN.o /tmp/cc2dxKl2.s
GNU assembler version 2.25 (x86_64-linux-gnu) using BFD version (GNU Binutils
for Debian) 2.25
GNU assembler (GNU Binutils for Debian) 2.25
Copyright (C) 2014 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or later.
This program has absolutely no warranty.
This assembler was configured for a target of `x86_64-linux-gnu'.
COMPILER_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.9/:/usr/lib/gcc/x86_64-linux-gnu/4.9/:/usr/lib/gcc/x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.9/:/usr/lib/gcc/x86_64-linux-gnu/
LIBRARY_PATH=/usr/lib/gcc/x86_64-linux-gnu/4.9/:/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu/:/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../../lib/:/lib/x86_64-linux-gnu/:/lib/../lib/:/usr/lib/x86_64-linux-gnu/:/usr/lib/../lib/:/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../:/lib/:/usr/lib/
COLLECT_GCC_OPTIONS='-v' '--version' '-mtune=generic' '-march=x86-64'
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collect2 version 4.9.2
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/usr/lib/gcc/x86_64-linux-gnu/4.9/../../../x86_64-linux-gnu/crtn.o
GNU ld (GNU Binutils for Debian) 2.25
Copyright (C) 2014 Free Software Foundation, Inc.
This program is free software; you may redistribute it under the terms of
the GNU General Public License version 3 or (at your option) a later version.
This program has absolutely no warranty.