* [Bug libstdc++/93059] char and char8_t does not talk with each other with memcpy. std::copy std::copy_n, std::fill, std::fill_n, std::uninitialized_copy std::uninitialized_copy_n, std::fill, std::uninitialized_fill_n fails to convert to memxxx functions
[not found] <bug-93059-4@http.gcc.gnu.org/bugzilla/>
@ 2019-12-29 3:33 ` euloanty at live dot com
2019-12-31 6:03 ` euloanty at live dot com
` (4 subsequent siblings)
5 siblings, 0 replies; 6+ messages in thread
From: euloanty at live dot com @ 2019-12-29 3:33 UTC (permalink / raw)
To: gcc-bugs
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93059
--- Comment #11 from fdlbxtqi <euloanty at live dot com> ---
(In reply to Marc Glisse from comment #8)
> (In reply to fdlbxtqi from comment #6)
> > void copy_char_vector_with_iter(std::vector<char8_t>::iterator
> > out,std::vector<char> const& bits)
> > {
> > std::copy_n(bits.begin(),bits.size(),out);
> > }
> >
> > https://godbolt.org/z/_yA_Ls
> > See the assembly
>
> Thanks, I just filed PR 93063 about a subpart that the compiler should be
> able to do without help from the library.
TBH. I would rather see the library does the optimization instead of the
compiler. I do not trust the compiler can always optimize this stuff.
>From gcc-bugs-return-664129-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 04:15:36 2019
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Subject: [Bug c++/93093] New: __builtin_source_location reports values for default arguments not aligned with the Standard
Date: Sun, 29 Dec 2019 04:15:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93093
Bug ID: 93093
Summary: __builtin_source_location reports values for default
arguments not aligned with the Standard
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
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Consider the following example from the C++ Standard N4842 (nice website
version: eel.is/c++draft/support.srcloc#cons-4):
===========
struct s {
source_location member = source_location::current();
int other_member;
s(source_location loc = source_location::current())
: member(loc) // values of member refer to the location of the
calling function ([dcl.fct.default])
{}
s(int blather) : // values of member refer to this location
other_member(blather)
{}
s(double) // values of member refer to this location
{}
};
void f(source_location a = source_location::current()) {
source_location b = source_location::current(); // values in b refer to
this line
}
void g() {
f(); // f's first argument corresponds to this line of code
source_location c = source_location::current();
f(c); // f's first argument gets the same values as c, above
}
===========
When source_location is implemented with __builtin_source_location, code like
the above does not report those locations. s{}.member does not refer to the
calling location, s(2.0).member does not refer to the constructor declaration
s, and s(1).member does not refer to that location, and so forth.
Some talking on IRC revealed that this might be because of constant evaluation
/ constant folding, changing how the source location attribute behaves in
instances like these. This also affects the patch at
https://gcc.gnu.org/ml/gcc-patches/2019-12/msg01579.html whose tests fail in
both static_assert and regular runtime VERIFYs.
>From gcc-bugs-return-664130-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 04:28:35 2019
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Subject: [Bug c/12245] [8/9/10 regression] Uses lots of memory when compiling large initialized arrays
Date: Sun, 29 Dec 2019 04:28:00 -0000
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JeanHeyd Meneide <phdofthehouse at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |phdofthehouse at gmail dot com
--- Comment #75 from JeanHeyd Meneide <phdofthehouse at gmail dot com> ---
I would like to add to this post. I experience severe memory usage and
compilation time consumption that ramps up heavily when dealing with binary
data. I documented much of my struggles here:
https://thephd.github.io/embed-the-details
I am being told that the functionality I am developing is more suited for a bug
report and that this should be compiler QoI. Upon attempting to file this bug,
I decided to throw my own data and woes into the ring here.
Is there a place I should start looking to help out with this? I would like to
start getting closer to the theoretical near-perfect overhead of dealing with
what essentially ends up being a large binary payload, without resorting to
#embed or any special builtins.
>From gcc-bugs-return-664131-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 04:37:18 2019
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Subject: [Bug libstdc++/93059] char and char8_t does not talk with each other with memcpy. std::copy std::copy_n, std::fill, std::fill_n, std::uninitialized_copy std::uninitialized_copy_n, std::fill, std::uninitialized_fill_n fails to convert to memxxx functions
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--- Comment #12 from fdlbxtqi <euloanty at live dot com> ---
(In reply to Marc Glisse from comment #8)
> (In reply to fdlbxtqi from comment #6)
> > void copy_char_vector_with_iter(std::vector<char8_t>::iterator
> > out,std::vector<char> const& bits)
> > {
> > std::copy_n(bits.begin(),bits.size(),out);
> > }
> >
> > https://godbolt.org/z/_yA_Ls
> > See the assembly
>
> Thanks, I just filed PR 93063 about a subpart that the compiler should be
> able to do without help from the library.
I think the implementation is still problematic since C++ 20 adds the
contiguous_iterator concept. The current implementation looks not to allow
custom
contiguous iterators types to be optimized as memmove.
It needs certain kinds of revamping IMO.
>From gcc-bugs-return-664132-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 08:22:23 2019
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Subject: [Bug libstdc++/93059] char and char8_t does not talk with each other with memcpy. std::copy std::copy_n, std::fill, std::fill_n, std::uninitialized_copy std::uninitialized_copy_n, std::fill, std::uninitialized_fill_n fails to convert to memxxx functions
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--- Comment #13 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to fdlbxtqi from comment #11)
> TBH. I would rather see the library does the optimization instead of the
> compiler. I do not trust the compiler can always optimize this stuff.
If we have both, that looks even safer ;-)
>From gcc-bugs-return-664133-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 08:30:59 2019
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Subject: [Bug libstdc++/93059] char and char8_t does not talk with each other with memcpy. std::copy std::copy_n, std::fill, std::fill_n, std::uninitialized_copy std::uninitialized_copy_n, std::fill, std::uninitialized_fill_n fails to convert to memxxx functions
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--- Comment #14 from fdlbxtqi <euloanty at live dot com> ---
I think It is worth the effort to rewrite these functions since they are so
fundamental to the performance of entire C++. What I am worry about is that
whether revamping these functions would be a new ABI breaking.
If it won’t, I would like to contribute my implementation.
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Sent: Sunday, December 29, 2019 03:22
To: euloanty@live.com<mailto:euloanty@live.com>
Subject: [Bug libstdc++/93059] char and char8_t does not talk with each other
with memcpy. std::copy std::copy_n, std::fill, std::fill_n,
std::uninitialized_copy std::uninitialized_copy_n, std::fill,
std::uninitialized_fill_n fails to convert to memxxx functions
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93059
--- Comment #13 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to fdlbxtqi from comment #11)
> TBH. I would rather see the library does the optimization instead of the
> compiler. I do not trust the compiler can always optimize this stuff.
If we have both, that looks even safer ;-)
--
You are receiving this mail because:
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You reported the bug.
>From gcc-bugs-return-664134-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 08:34:05 2019
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Subject: [Bug libstdc++/93059] char and char8_t does not talk with each other with memcpy. std::copy std::copy_n, std::fill, std::fill_n, std::uninitialized_copy std::uninitialized_copy_n, std::fill, std::uninitialized_fill_n fails to convert to memxxx functions
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--- Comment #15 from fdlbxtqi <euloanty at live dot com> ---
(In reply to fdlbxtqi from comment #14)
> I think It is worth the effort to rewrite these functions since they are so
> fundamental to the performance of entire C++. What I am worry about is that
> whether revamping these functions would be a new ABI breaking.
>
> If it won’t, I would like to contribute my implementation.
>
> Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
>
> From: glisse at gcc dot gnu.org<mailto:gcc-bugzilla@gcc.gnu.org>
> Sent: Sunday, December 29, 2019 03:22
> To: euloanty@live.com<mailto:euloanty@live.com>
> Subject: [Bug libstdc++/93059] char and char8_t does not talk with each
> other with memcpy. std::copy std::copy_n, std::fill, std::fill_n,
> std::uninitialized_copy std::uninitialized_copy_n, std::fill,
> std::uninitialized_fill_n fails to convert to memxxx functions
>
> https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93059
>
> --- Comment #13 from Marc Glisse <glisse at gcc dot gnu.org> ---
> (In reply to fdlbxtqi from comment #11)
> > TBH. I would rather see the library does the optimization instead of the
> > compiler. I do not trust the compiler can always optimize this stuff.
>
> If we have both, that looks even safer ;-)
>
> --
> You are receiving this mail because:
> You are on the CC list for the bug.
> You reported the bug.
I think It is worth the effort to rewrite these functions since they are so
fundamental to the performance of entire C++. Revamping them would create 100%
of performance benefits in a lot of important benchmarks. What I am worried
about is that whether revamping these functions would be a new wave of ABI
breaking.
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93059
--- Comment #16 from fdlbxtqi <euloanty at live dot com> ---
(In reply to Marc Glisse from comment #13)
> (In reply to fdlbxtqi from comment #11)
> > TBH. I would rather see the library does the optimization instead of the
> > compiler. I do not trust the compiler can always optimize this stuff.
>
> If we have both, that looks even safer ;-)
Concepts are no doubt a huge deal breaker.
>From gcc-bugs-return-664136-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 10:21:10 2019
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Subject: [Bug libstdc++/93059] char and char8_t does not talk with each other with memcpy. std::copy std::copy_n, std::fill, std::fill_n, std::uninitialized_copy std::uninitialized_copy_n, std::fill, std::uninitialized_fill_n fails to convert to memxxx functions
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--- Comment #17 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to fdlbxtqi from comment #15)
> What I am worried about is that whether revamping these functions would be a new wave of ABI breaking.
I don't foresee any ABI issue here. Do make sure your code doesn't break with
-std=c++03, and run the testsuite before submitting it.
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Subject: [Bug target/93078] Missing fma and round functions auto-vectorization with x86-64 (sse2)
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--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Sun Dec 29 11:03:25 2019
New Revision: 279754
URL: https://gcc.gnu.org/viewcvs?rev=279754&root=gcc&view=rev
Log:
PR target/93078
* config/i386/i386-builtins.c (ix86_builtin_vectorized_function):
Remove CASE_CFN_RINT handling.
* config/i386/i386-builtin.def (IX86_BUILTIN_RINTPD,
IX86_BUILTIN_RINTPS, IX86_BUILTIN_RINTPD256, IX86_BUILTIN_RINTPS256):
Remove.
* config/i386/sse.md (nearbyint<mode>2, rint<mode>2): New expanders
with VF iterator.
* gcc.target/i386/sse4_1-pr93078.c: New test.
* gcc.target/i386/avx-pr93078.c: New test.
* gcc.target/i386/avx512f-pr93078.c: New test.
Added:
trunk/gcc/testsuite/gcc.target/i386/avx-pr93078.c
trunk/gcc/testsuite/gcc.target/i386/avx512f-pr93078.c
trunk/gcc/testsuite/gcc.target/i386/sse4_1-pr93078.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/config/i386/i386-builtin.def
trunk/gcc/config/i386/i386-builtins.c
trunk/gcc/config/i386/sse.md
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/91310] Read overflow generated by character array assignment to self
Date: Sun, 29 Dec 2019 11:49:00 -0000
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
CC| |tkoenig at gcc dot gnu.org
--- Comment #5 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Just going through the test cases...
Test case number 1 is invalid.
F2018, 9.4.1:
3 Let the characters in the parent string be numbered 1, 2, 3, ..., n, where n
is the length of the parent string.
Then the characters in the substring are those from the parent string from the
starting point and proceeding in
sequence up to and including the ending point. If the starting point is greater
than the ending point, the substring
has length zero; otherwise, both the starting point and the ending point shall
be within the range 1, 2, ..., n. If
the starting point is not specified, the default value is 1. If the ending
point is not specified, the default value is
n.
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Subject: [Bug fortran/91310] Read overflow generated by character array assignment to self
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--- Comment #6 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Comment on attachment 46648
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46648
test case 1
Oops, correction. If len is small enough, the test case can be
valid (well, it could be if str was ever assigned).
Digging further...
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Subject: [Bug fortran/91310] Read overflow generated by character array assignment to self
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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--- Comment #7 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
OK, so finally:
If len + 3 > 512, _then_ the test case is invalid.
It would be nice to add bounds checking for that case, but
that's another kettle if fish.
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Subject: [Bug libstdc++/93059] char and char8_t does not talk with each other with memcpy. std::copy std::copy_n, std::fill, std::fill_n, std::uninitialized_copy std::uninitialized_copy_n, std::fill, std::uninitialized_fill_n fails to convert to memxxx functions
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--- Comment #18 from fdlbxtqi <euloanty at live dot com> ---
(In reply to Marc Glisse from comment #17)
> (In reply to fdlbxtqi from comment #15)
> > What I am worried about is that whether revamping these functions would be a new wave of ABI breaking.
>
> I don't foresee any ABI issue here. Do make sure your code doesn't break
> with -std=c++03, and run the testsuite before submitting it.
Also, I have found another bug??? in both libstdc++ and libc++????
memmove is not allowed for using volatile. Only MSVC passes the test.
libstdc++&libc++ are wrong.
https://godbolt.org/z/FoTCbk
I will fix this as well.
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug rtl-optimization/93094] New: [10 Regression] ICE in maybe_gen_insn, at optabs.c:7433
Date: Sun, 29 Dec 2019 13:58:00 -0000
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Bug ID: 93094
Summary: [10 Regression] ICE in maybe_gen_insn, at
optabs.c:7433
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Keywords: ice-on-valid-code
Severity: normal
Priority: P3
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Reporter: asolokha at gmx dot com
Target Milestone: ---
Target: x86_64-unknown-linux-gnu
gcc-10.0.0-alpha20191222 snapshot (r279712) ICEs when compiling the following
testcase w/ -mavx512bw -O3 -fno-tree-pre:
void
ll (char *un, char *rr, int te, int fp, int nb)
{
const int xe = nb & 1;
while (fp-- != 0)
{
if ((rr[0] & xe) == 0)
un[0] = 0;
un += te;
rr += te;
}
}
% x86_64-unknown-linux-gnu-gcc-10.0.0-alpha20191222 -mavx512bw -O3
-fno-tree-pre -c rgldkcen.c
during RTL pass: expand
rgldkcen.c: In function 'll':
rgldkcen.c:9:15: internal compiler error: in maybe_gen_insn, at optabs.c:7433
9 | un[0] = 0;
| ~~~~~~^~~
0x65fcb3 maybe_gen_insn(insn_code, unsigned int, expand_operand*)
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191222/work/gcc-10-20191222/gcc/optabs.c:7433
0xc329db maybe_expand_insn(insn_code, unsigned int, expand_operand*)
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191222/work/gcc-10-20191222/gcc/optabs.c:7477
0xc329db expand_insn(insn_code, unsigned int, expand_operand*)
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191222/work/gcc-10-20191222/gcc/optabs.c:7508
0xaf75ee expand_mask_store_optab_fn
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191222/work/gcc-10-20191222/gcc/internal-fn.c:2542
0x8c9ebe expand_call_stmt
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191222/work/gcc-10-20191222/gcc/cfgexpand.c:2609
0x8c9ebe expand_gimple_stmt_1
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191222/work/gcc-10-20191222/gcc/cfgexpand.c:3679
0x8c9ebe expand_gimple_stmt
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191222/work/gcc-10-20191222/gcc/cfgexpand.c:3844
0x8ce352 expand_gimple_basic_block
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191222/work/gcc-10-20191222/gcc/cfgexpand.c:5884
0x8d02e3 execute
/var/tmp/portage/sys-devel/gcc-10.0.0_alpha20191222/work/gcc-10-20191222/gcc/cfgexpand.c:6539
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Subject: [Bug libstdc++/93059] char and char8_t does not talk with each other with memcpy. std::copy std::copy_n, std::fill, std::fill_n, std::uninitialized_copy std::uninitialized_copy_n, std::fill, std::uninitialized_fill_n fails to convert to memxxx functions
Date: Sun, 29 Dec 2019 14:53:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93059
--- Comment #19 from fdlbxtqi <euloanty at live dot com> ---
Created attachment 47559
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47559&action=edit
An untested patch
From 1dfd714e1f29e229d69a0c7f6f84bf05dd4ee85d Mon Sep 17 00:00:00 2001
From: expnkx <unlvsur@live.com>
Date: Sun, 29 Dec 2019 09:49:19 -0500
Subject: [PATCH] Untested patch fix volatile bug of std::copyXXX and
std::uninitialized_copyXXX Support custom contiguous_iterator Fix undefined
behavior of &*end constexpr std::fill Greatly improve performance of
std::copyXXX and std::uninitialized_copyXX for different types and apply
pipeline optimization to reduce branch misprediction
>From gcc-bugs-return-664146-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 15:06:56 2019
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Subject: [Bug libstdc++/93059] char and char8_t does not talk with each other with memcpy. std::copy std::copy_n, std::fill, std::fill_n, std::uninitialized_copy std::uninitialized_copy_n, std::fill, std::uninitialized_fill_n fails to convert to memxxx functions
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93059
--- Comment #22 from fdlbxtqi <euloanty at live dot com> ---
Comment on attachment 47559
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47559
An untested patch
>From 1dfd714e1f29e229d69a0c7f6f84bf05dd4ee85d Mon Sep 17 00:00:00 2001
>From: expnkx <unlvsur@live.com>
>Date: Sun, 29 Dec 2019 09:49:19 -0500
>Subject: [PATCH] Untested patch fix volatile bug of std::copyXXX and
> std::uninitialized_copyXXX Support custom contiguous_iterator Fix undefined
> behavior of &*end constexpr std::fill Greatly improve performance of
> std::copyXXX and std::uninitialized_copyXX for different types and apply
> pipeline optimization to reduce branch misprediction
>
>---
> libstdc++-v3/include/bits/stl_algobase.h | 170 ++++++++++++++++++++---
> 1 file changed, 148 insertions(+), 22 deletions(-)
>
>diff --git a/libstdc++-v3/include/bits/stl_algobase.h b/libstdc++-v3/include/bits/stl_algobase.h
>index 40d056ae8d5..01672a8f232 100644
>--- a/libstdc++-v3/include/bits/stl_algobase.h
>+++ b/libstdc++-v3/include/bits/stl_algobase.h
>@@ -1,6 +1,6 @@
> // Core algorithmic facilities -*- C++ -*-
>
>-// Copyright (C) 2001-2019 Free Software Foundation, Inc.
>+// Copyright (C) 2001-2020 Free Software Foundation, Inc.
> //
> // This file is part of the GNU ISO C++ Library. This library is free
> // software; you can redistribute it and/or modify it under the
>@@ -84,10 +84,37 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> * A constexpr wrapper for __builtin_memmove.
> * @param __num The number of elements of type _Tp (not bytes).
> */
>+#ifndef __cpp_lib_concepts
> template<bool _IsMove, typename _Tp>
>+ _GLIBCXX14_CONSTEXPR
>+ inline void volatile*
>+ __memmove(_Tp volatile* __dst, _Tp volatile const* __src, size_t __num)
>+ {
>+ for(; __num > 0; --__num)
>+ {
>+#if __cplusplus >= 201103L
>+ if constexpr (_IsMove)
>+ *__dst = std::move(*__src);
>+ else
>+#endif
>+ *__dst = *__src;
>+ ++__src;
>+ ++__dst;
>+ }
>+ return __dst;
>+ }
>+#endif
>+ template<bool _IsMove, typename _Tp,typename _Tp_src>
>+/*
>+#ifdef __cpp_lib_concepts
>+ requires (is_trivially_copyable_v<_Tp>&&!is_volatile_v<_Tp>
>+ &&is_trivially_copyable_v<_Tp_src>&&!is_volatile_v<_Tp_src>
>+ &&(same_as<_Tp,_Tp_src>||(sizeof(_Tp)==sizeof(_Tp_src)&&integral<_Tp>&&integral<_Tp_src>)))
>+#endif
>+*/
> _GLIBCXX14_CONSTEXPR
> inline void*
>- __memmove(_Tp* __dst, const _Tp* __src, size_t __num)
>+ __memmove(_Tp* __dst, _Tp_src const* __src, size_t __num)
> {
> #ifdef __cpp_lib_is_constant_evaluated
> if (std::is_constant_evaluated())
>@@ -106,9 +133,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> else
> #endif
> return __builtin_memmove(__dst, __src, sizeof(_Tp) * __num);
>- return __dst;
> }
>-
> /*
> * A constexpr wrapper for __builtin_memcmp.
> * @param __num The number of elements of type _Tp (not bytes).
>@@ -431,7 +456,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> }
> };
> #endif
>-
>+#ifndef __cpp_lib_concepts
> template<bool _IsMove>
> struct __copy_move<_IsMove, true, random_access_iterator_tag>
> {
>@@ -448,12 +473,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> static_assert( __assignable::type::value, "type is not assignable" );
> #endif
> const ptrdiff_t _Num = __last - __first;
>- if (_Num)
>- std::__memmove<_IsMove>(__result, __first, _Num);
>+ if (!_Num)
>+ return __result + _Num;
>+//since before C++20, we do not have [[likely]] attribute. We need to do it manually
>+ std::__memmove<_IsMove>(__result, __first, _Num);
> return __result + _Num;
> }
> };
>-
>+#endif
> // Helpers for streambuf iterators (either istream or ostream).
> // NB: avoid including <iosfwd>, relatively large.
> template<typename _CharT>
>@@ -491,11 +518,41 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> typedef typename iterator_traits<_II>::value_type _ValueTypeI;
> typedef typename iterator_traits<_OI>::value_type _ValueTypeO;
> typedef typename iterator_traits<_II>::iterator_category _Category;
>+#ifdef __cpp_lib_concepts
>+ if constexpr(
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__first)>>)&&
>+ is_trivially_copyable_v<_ValueTypeI>)&&
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__result)>>)&&
>+ is_trivially_copyable_v<_ValueTypeO>)&&
>+ contiguous_iterator<_II>&&
>+ contiguous_iterator<_OI>&&
>+ (same_as<_ValueTypeI,_ValueTypeO>
>+ ||(integral<_ValueTypeI>&&integral<_ValueTypeO>&&
>+ sizeof(_ValueTypeI)==sizeof(_ValueTypeO))))
>+ {
>+ using __assignable = conditional<_IsMove,
>+ is_move_assignable<_OI>,
>+ is_copy_assignable<_OI>>;
>+ static_assert( __assignable::type::value, "result type is not assignable" );
>+ ptrdiff_t const _Num = __last - __first;
>+ if (_Num)
>+#ifdef __has_cpp_attribute(likely)
>+//This if statement is by default bad since it affects CPU pipeline.
>+//needs likely attribute or the branch misprediction penalty (100% misprediction rate probably) is HUGE
>+ [[likely]]
>+#endif
>+ std::__memmove<_IsMove>(to_address(__result), to_address(__first), _Num);
>+ return __result + _Num;
>+ }
>+ else
>+ return std::__copy_move<_IsMove, false,
>+#else
> const bool __simple = (__is_trivially_copyable(_ValueTypeI)
> && __is_pointer<_II>::__value
> && __is_pointer<_OI>::__value
> && __are_same<_ValueTypeI, _ValueTypeO>::__value);
> return std::__copy_move<_IsMove, __simple,
>+#endif
> _Category>::__copy_m(__first, __last, __result);
> }
>
>@@ -581,6 +638,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> * Note that the end of the output range is permitted to be contained
> * within [first,last).
> */
>+
> template<typename _II, typename _OI>
> _GLIBCXX20_CONSTEXPR
> inline _OI
>@@ -595,7 +653,6 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> return std::__copy_move_a<__is_move_iterator<_II>::__value>
> (std::__miter_base(__first), std::__miter_base(__last), __result);
> }
>-
> #if __cplusplus >= 201103L
> /**
> * @brief Moves the range [first,last) into result.
>@@ -698,6 +755,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> };
> #endif
>
>+#ifndef __cpp_lib_concepts
> template<bool _IsMove>
> struct __copy_move_backward<_IsMove, true, random_access_iterator_tag>
> {
>@@ -714,11 +772,13 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> static_assert( __assignable::type::value, "type is not assignable" );
> #endif
> const ptrdiff_t _Num = __last - __first;
>- if (_Num)
>- std::__memmove<_IsMove>(__result - _Num, __first, _Num);
>+ if (!_Num)
>+ return __result - _Num;
>+ std::__memmove<_IsMove>(__result - _Num, __first, _Num);
> return __result - _Num;
> }
> };
>+#endif
>
> template<bool _IsMove, typename _BI1, typename _BI2>
> _GLIBCXX20_CONSTEXPR
>@@ -728,21 +788,56 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> typedef typename iterator_traits<_BI1>::value_type _ValueType1;
> typedef typename iterator_traits<_BI2>::value_type _ValueType2;
> typedef typename iterator_traits<_BI1>::iterator_category _Category;
>- const bool __simple = (__is_trivially_copyable(_ValueType1)
>- && __is_pointer<_BI1>::__value
>- && __is_pointer<_BI2>::__value
>- && __are_same<_ValueType1, _ValueType2>::__value);
>-
> #ifdef __cpp_lib_is_constant_evaluated
> if (std::is_constant_evaluated())
>- return std::__copy_move_backward<true, false,
>+ return std::__copy_move_backward<true, false,
> _Category>::__copy_move_b(__first, __last,
> __result);
>+ else
>+ {
> #endif
>+#if __cpp_lib_concepts
>+ if constexpr(
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__first)>>)&&
>+ is_trivially_copyable_v<_ValueType1>)&&
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__result)>>)&&
>+ is_trivially_copyable_v<_ValueType2>)&&
>+ contiguous_iterator<_BI1>&&
>+ contiguous_iterator<_BI2>&&
>+ (same_as<_ValueType1,_ValueType2>
>+ ||(integral<_ValueType1>&&integral<_ValueType2>&&
>+ sizeof(_ValueType1)==sizeof(_ValueType2))))
>+ {
>+ using __assignable = conditional<_IsMove,
>+ is_move_assignable<_ValueType2>,
>+ is_copy_assignable<_ValueType2>>;
>+ // trivial types can have deleted assignment
>+ static_assert( __assignable::type::value, "type is not assignable" );
>+ ptrdiff_t const _Num = __last - __first;
>+ if (_Num)
>+ #ifdef __has_cpp_attribute(likely)
>+ [[likely]]
>+ #endif
>+ std::__memmove<_IsMove>(to_address(__result) - _Num, to_address(__first), _Num);
>+ return __result - _Num;
>+ }
>+#else
>+ const bool __simple = (
>+#if __cplusplus >= 201103L
>+ (!is_volatile<typename std::remove_reference<decltype(*__first)>::type>::value)&&
>+#endif
>+ __is_trivially_copyable(_ValueType1)
>+ && __is_pointer<_BI1>::__value
>+ && __is_pointer<_BI2>::__value
>+ && __are_same<_ValueType1, _ValueType2>::__value);
> return std::__copy_move_backward<_IsMove, __simple,
> _Category>::__copy_move_b(__first,
> __last,
> __result);
>+#endif
>+#ifdef __cpp_lib_is_constant_evaluated
>+ }
>+#endif
> }
>
> template<bool _IsMove, typename _BI1, typename _BI2>
>@@ -908,16 +1003,33 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> }
>
> // Specialization: for char types we can use memset.
>+
> template<typename _Tp>
>+ _GLIBCXX20_CONSTEXPR
> inline typename
> __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, void>::__type
> __fill_a1(_Tp* __first, _Tp* __last, const _Tp& __c)
> {
>- const _Tp __tmp = __c;
>+ _Tp const __tmp = __c;
>+#ifdef __cpp_lib_is_constant_evaluated
>+ if (std::is_constant_evaluated())
>+ {
>+ for (; __first != __last; ++__first)
>+ *__first = __tmp;
>+ }
>+ else
>+ {
>+#endif
> if (const size_t __len = __last - __first)
>+#ifdef __has_cpp_attribute(likely)
>+ [[likely]]
>+#endif
> __builtin_memset(__first, static_cast<unsigned char>(__tmp), __len);
>+#ifdef __cpp_lib_is_constant_evaluated
> }
>-
>+#endif
>+ }
>+#ifndef __cpp_lib_concepts
> template<typename _Ite, typename _Cont, typename _Tp>
> _GLIBCXX20_CONSTEXPR
> inline void
>@@ -925,7 +1037,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> ::__gnu_cxx::__normal_iterator<_Ite, _Cont> __last,
> const _Tp& __value)
> { std::__fill_a1(__first.base(), __last.base(), __value); }
>-
>+#endif
> template<typename _Tp, typename _VTp>
> void
> __fill_a1(const _GLIBCXX_STD_C::_Deque_iterator<_Tp, _Tp&, _Tp*>&,
>@@ -936,7 +1048,14 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> _GLIBCXX20_CONSTEXPR
> inline void
> __fill_a(_FIte __first, _FIte __last, const _Tp& __value)
>- { std::__fill_a1(__first, __last, __value); }
>+ {
>+#ifdef __cpp_lib_concepts
>+ if constexpr(contiguous_iterator<_FIte>)
>+ std::__fill_a1(to_address(__first), to_address(__last), __value);
>+ else
>+#endif
>+ std::__fill_a1(__first, __last, __value);
>+ }
>
> template<typename _Ite, typename _Seq, typename _Cat, typename _Tp>
> void
>@@ -1306,6 +1425,9 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> const size_t __len1 = __last1 - __first1;
> const size_t __len2 = __last2 - __first2;
> if (const size_t __len = std::min(__len1, __len2))
>+#ifdef __has_cpp_attribute(likely)
>+ [[likely]]
>+#endif
> if (int __result = std::__memcmp(__first1, __first2, __len))
> return __result < 0;
> return __len1 < __len2;
>@@ -1733,7 +1855,11 @@ _GLIBCXX_BEGIN_NAMESPACE_ALGO
> if (__len)
> {
> const auto __c
>- = __builtin_memcmp(&*__first1, &*__first2, __len) <=> 0;
>+ = __builtin_memcmp(to_address(__first1), to_address(__first2), __len) <=> 0;
>+//&*__first1 is not correct and would crash program. Must use to_address()
>+//since a lot of debugging iterator would not be allowed to dereference __first2.
>+//It is undefined behavior to derefernce sentinal iterators
>+//For example, VC's implementation
> if (__c != 0)
> return __c;
> }
>--
>2.24.0.windows.2
>
>From gcc-bugs-return-664144-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 15:06:49 2019
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From: "euloanty at live dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/93059] char and char8_t does not talk with each other with memcpy. std::copy std::copy_n, std::fill, std::fill_n, std::uninitialized_copy std::uninitialized_copy_n, std::fill, std::uninitialized_fill_n fails to convert to memxxx functions
Date: Sun, 29 Dec 2019 15:06:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93059
--- Comment #20 from fdlbxtqi <euloanty at live dot com> ---
Comment on attachment 47559
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47559
An untested patch
>From 1dfd714e1f29e229d69a0c7f6f84bf05dd4ee85d Mon Sep 17 00:00:00 2001
>From: expnkx <unlvsur@live.com>
>Date: Sun, 29 Dec 2019 09:49:19 -0500
>Subject: [PATCH] Untested patch fix volatile bug of std::copyXXX and
> std::uninitialized_copyXXX Support custom contiguous_iterator Fix undefined
> behavior of &*end constexpr std::fill Greatly improve performance of
> std::copyXXX and std::uninitialized_copyXX for different types and apply
> pipeline optimization to reduce branch misprediction
>
>---
> libstdc++-v3/include/bits/stl_algobase.h | 170 ++++++++++++++++++++---
> 1 file changed, 148 insertions(+), 22 deletions(-)
>
>diff --git a/libstdc++-v3/include/bits/stl_algobase.h b/libstdc++-v3/include/bits/stl_algobase.h
>index 40d056ae8d5..01672a8f232 100644
>--- a/libstdc++-v3/include/bits/stl_algobase.h
>+++ b/libstdc++-v3/include/bits/stl_algobase.h
>@@ -1,6 +1,6 @@
> // Core algorithmic facilities -*- C++ -*-
>
>-// Copyright (C) 2001-2019 Free Software Foundation, Inc.
>+// Copyright (C) 2001-2020 Free Software Foundation, Inc.
> //
> // This file is part of the GNU ISO C++ Library. This library is free
> // software; you can redistribute it and/or modify it under the
>@@ -84,10 +84,37 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> * A constexpr wrapper for __builtin_memmove.
> * @param __num The number of elements of type _Tp (not bytes).
> */
>+#ifndef __cpp_lib_concepts
> template<bool _IsMove, typename _Tp>
>+ _GLIBCXX14_CONSTEXPR
>+ inline void volatile*
>+ __memmove(_Tp volatile* __dst, _Tp volatile const* __src, size_t __num)
>+ {
>+ for(; __num > 0; --__num)
>+ {
>+#if __cplusplus >= 201103L
>+ if constexpr (_IsMove)
>+ *__dst = std::move(*__src);
>+ else
>+#endif
>+ *__dst = *__src;
>+ ++__src;
>+ ++__dst;
>+ }
>+ return __dst;
>+ }
>+#endif
>+ template<bool _IsMove, typename _Tp,typename _Tp_src>
>+/*
>+#ifdef __cpp_lib_concepts
>+ requires (is_trivially_copyable_v<_Tp>&&!is_volatile_v<_Tp>
>+ &&is_trivially_copyable_v<_Tp_src>&&!is_volatile_v<_Tp_src>
>+ &&(same_as<_Tp,_Tp_src>||(sizeof(_Tp)==sizeof(_Tp_src)&&integral<_Tp>&&integral<_Tp_src>)))
>+#endif
>+*/
> _GLIBCXX14_CONSTEXPR
> inline void*
>- __memmove(_Tp* __dst, const _Tp* __src, size_t __num)
>+ __memmove(_Tp* __dst, _Tp_src const* __src, size_t __num)
> {
> #ifdef __cpp_lib_is_constant_evaluated
> if (std::is_constant_evaluated())
>@@ -106,9 +133,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> else
> #endif
> return __builtin_memmove(__dst, __src, sizeof(_Tp) * __num);
>- return __dst;
> }
>-
> /*
> * A constexpr wrapper for __builtin_memcmp.
> * @param __num The number of elements of type _Tp (not bytes).
>@@ -431,7 +456,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> }
> };
> #endif
>-
>+#ifndef __cpp_lib_concepts
> template<bool _IsMove>
> struct __copy_move<_IsMove, true, random_access_iterator_tag>
> {
>@@ -448,12 +473,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> static_assert( __assignable::type::value, "type is not assignable" );
> #endif
> const ptrdiff_t _Num = __last - __first;
>- if (_Num)
>- std::__memmove<_IsMove>(__result, __first, _Num);
>+ if (!_Num)
>+ return __result + _Num;
>+//since before C++20, we do not have [[likely]] attribute. We need to do it manually
>+ std::__memmove<_IsMove>(__result, __first, _Num);
> return __result + _Num;
> }
> };
>-
>+#endif
> // Helpers for streambuf iterators (either istream or ostream).
> // NB: avoid including <iosfwd>, relatively large.
> template<typename _CharT>
>@@ -491,11 +518,41 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> typedef typename iterator_traits<_II>::value_type _ValueTypeI;
> typedef typename iterator_traits<_OI>::value_type _ValueTypeO;
> typedef typename iterator_traits<_II>::iterator_category _Category;
>+#ifdef __cpp_lib_concepts
>+ if constexpr(
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__first)>>)&&
>+ is_trivially_copyable_v<_ValueTypeI>)&&
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__result)>>)&&
>+ is_trivially_copyable_v<_ValueTypeO>)&&
>+ contiguous_iterator<_II>&&
>+ contiguous_iterator<_OI>&&
>+ (same_as<_ValueTypeI,_ValueTypeO>
>+ ||(integral<_ValueTypeI>&&integral<_ValueTypeO>&&
>+ sizeof(_ValueTypeI)==sizeof(_ValueTypeO))))
>+ {
>+ using __assignable = conditional<_IsMove,
>+ is_move_assignable<_OI>,
>+ is_copy_assignable<_OI>>;
>+ static_assert( __assignable::type::value, "result type is not assignable" );
>+ ptrdiff_t const _Num = __last - __first;
>+ if (_Num)
>+#ifdef __has_cpp_attribute(likely)
>+//This if statement is by default bad since it affects CPU pipeline.
>+//needs likely attribute or the branch misprediction penalty (100% misprediction rate probably) is HUGE
>+ [[likely]]
>+#endif
>+ std::__memmove<_IsMove>(to_address(__result), to_address(__first), _Num);
>+ return __result + _Num;
>+ }
>+ else
>+ return std::__copy_move<_IsMove, false,
>+#else
> const bool __simple = (__is_trivially_copyable(_ValueTypeI)
> && __is_pointer<_II>::__value
> && __is_pointer<_OI>::__value
> && __are_same<_ValueTypeI, _ValueTypeO>::__value);
> return std::__copy_move<_IsMove, __simple,
>+#endif
> _Category>::__copy_m(__first, __last, __result);
> }
>
>@@ -581,6 +638,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> * Note that the end of the output range is permitted to be contained
> * within [first,last).
> */
>+
> template<typename _II, typename _OI>
> _GLIBCXX20_CONSTEXPR
> inline _OI
>@@ -595,7 +653,6 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> return std::__copy_move_a<__is_move_iterator<_II>::__value>
> (std::__miter_base(__first), std::__miter_base(__last), __result);
> }
>-
> #if __cplusplus >= 201103L
> /**
> * @brief Moves the range [first,last) into result.
>@@ -698,6 +755,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> };
> #endif
>
>+#ifndef __cpp_lib_concepts
> template<bool _IsMove>
> struct __copy_move_backward<_IsMove, true, random_access_iterator_tag>
> {
>@@ -714,11 +772,13 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> static_assert( __assignable::type::value, "type is not assignable" );
> #endif
> const ptrdiff_t _Num = __last - __first;
>- if (_Num)
>- std::__memmove<_IsMove>(__result - _Num, __first, _Num);
>+ if (!_Num)
>+ return __result - _Num;
>+ std::__memmove<_IsMove>(__result - _Num, __first, _Num);
> return __result - _Num;
> }
> };
>+#endif
>
> template<bool _IsMove, typename _BI1, typename _BI2>
> _GLIBCXX20_CONSTEXPR
>@@ -728,21 +788,56 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> typedef typename iterator_traits<_BI1>::value_type _ValueType1;
> typedef typename iterator_traits<_BI2>::value_type _ValueType2;
> typedef typename iterator_traits<_BI1>::iterator_category _Category;
>- const bool __simple = (__is_trivially_copyable(_ValueType1)
>- && __is_pointer<_BI1>::__value
>- && __is_pointer<_BI2>::__value
>- && __are_same<_ValueType1, _ValueType2>::__value);
>-
> #ifdef __cpp_lib_is_constant_evaluated
> if (std::is_constant_evaluated())
>- return std::__copy_move_backward<true, false,
>+ return std::__copy_move_backward<true, false,
> _Category>::__copy_move_b(__first, __last,
> __result);
>+ else
>+ {
> #endif
>+#if __cpp_lib_concepts
>+ if constexpr(
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__first)>>)&&
>+ is_trivially_copyable_v<_ValueType1>)&&
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__result)>>)&&
>+ is_trivially_copyable_v<_ValueType2>)&&
>+ contiguous_iterator<_BI1>&&
>+ contiguous_iterator<_BI2>&&
>+ (same_as<_ValueType1,_ValueType2>
>+ ||(integral<_ValueType1>&&integral<_ValueType2>&&
>+ sizeof(_ValueType1)==sizeof(_ValueType2))))
>+ {
>+ using __assignable = conditional<_IsMove,
>+ is_move_assignable<_ValueType2>,
>+ is_copy_assignable<_ValueType2>>;
>+ // trivial types can have deleted assignment
>+ static_assert( __assignable::type::value, "type is not assignable" );
>+ ptrdiff_t const _Num = __last - __first;
>+ if (_Num)
>+ #ifdef __has_cpp_attribute(likely)
>+ [[likely]]
>+ #endif
>+ std::__memmove<_IsMove>(to_address(__result) - _Num, to_address(__first), _Num);
>+ return __result - _Num;
>+ }
>+#else
>+ const bool __simple = (
>+#if __cplusplus >= 201103L
>+ (!is_volatile<typename std::remove_reference<decltype(*__first)>::type>::value)&&
>+#endif
>+ __is_trivially_copyable(_ValueType1)
>+ && __is_pointer<_BI1>::__value
>+ && __is_pointer<_BI2>::__value
>+ && __are_same<_ValueType1, _ValueType2>::__value);
> return std::__copy_move_backward<_IsMove, __simple,
> _Category>::__copy_move_b(__first,
> __last,
> __result);
>+#endif
>+#ifdef __cpp_lib_is_constant_evaluated
>+ }
>+#endif
> }
>
> template<bool _IsMove, typename _BI1, typename _BI2>
>@@ -908,16 +1003,33 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> }
>
> // Specialization: for char types we can use memset.
>+
> template<typename _Tp>
>+ _GLIBCXX20_CONSTEXPR
> inline typename
> __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, void>::__type
> __fill_a1(_Tp* __first, _Tp* __last, const _Tp& __c)
> {
>- const _Tp __tmp = __c;
>+ _Tp const __tmp = __c;
>+#ifdef __cpp_lib_is_constant_evaluated
>+ if (std::is_constant_evaluated())
>+ {
>+ for (; __first != __last; ++__first)
>+ *__first = __tmp;
>+ }
>+ else
>+ {
>+#endif
> if (const size_t __len = __last - __first)
>+#ifdef __has_cpp_attribute(likely)
>+ [[likely]]
>+#endif
> __builtin_memset(__first, static_cast<unsigned char>(__tmp), __len);
>+#ifdef __cpp_lib_is_constant_evaluated
> }
>-
>+#endif
>+ }
>+#ifndef __cpp_lib_concepts
> template<typename _Ite, typename _Cont, typename _Tp>
> _GLIBCXX20_CONSTEXPR
> inline void
>@@ -925,7 +1037,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> ::__gnu_cxx::__normal_iterator<_Ite, _Cont> __last,
> const _Tp& __value)
> { std::__fill_a1(__first.base(), __last.base(), __value); }
>-
>+#endif
> template<typename _Tp, typename _VTp>
> void
> __fill_a1(const _GLIBCXX_STD_C::_Deque_iterator<_Tp, _Tp&, _Tp*>&,
>@@ -936,7 +1048,14 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> _GLIBCXX20_CONSTEXPR
> inline void
> __fill_a(_FIte __first, _FIte __last, const _Tp& __value)
>- { std::__fill_a1(__first, __last, __value); }
>+ {
>+#ifdef __cpp_lib_concepts
>+ if constexpr(contiguous_iterator<_FIte>)
>+ std::__fill_a1(to_address(__first), to_address(__last), __value);
>+ else
>+#endif
>+ std::__fill_a1(__first, __last, __value);
>+ }
>
> template<typename _Ite, typename _Seq, typename _Cat, typename _Tp>
> void
>@@ -1306,6 +1425,9 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> const size_t __len1 = __last1 - __first1;
> const size_t __len2 = __last2 - __first2;
> if (const size_t __len = std::min(__len1, __len2))
>+#ifdef __has_cpp_attribute(likely)
>+ [[likely]]
>+#endif
> if (int __result = std::__memcmp(__first1, __first2, __len))
> return __result < 0;
> return __len1 < __len2;
>@@ -1733,7 +1855,11 @@ _GLIBCXX_BEGIN_NAMESPACE_ALGO
> if (__len)
> {
> const auto __c
>- = __builtin_memcmp(&*__first1, &*__first2, __len) <=> 0;
>+ = __builtin_memcmp(to_address(__first1), to_address(__first2), __len) <=> 0;
>+//&*__first1 is not correct and would crash program. Must use to_address()
>+//since a lot of debugging iterator would not be allowed to dereference __first2.
>+//It is undefined behavior to derefernce sentinal iterators
>+//For example, VC's implementation
> if (__c != 0)
> return __c;
> }
>--
>2.24.0.windows.2
>
>From gcc-bugs-return-664145-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 15:06:52 2019
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From: "euloanty at live dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/93059] char and char8_t does not talk with each other with memcpy. std::copy std::copy_n, std::fill, std::fill_n, std::uninitialized_copy std::uninitialized_copy_n, std::fill, std::uninitialized_fill_n fails to convert to memxxx functions
Date: Sun, 29 Dec 2019 15:07:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
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X-Bugzilla-Severity: normal
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93059
--- Comment #21 from fdlbxtqi <euloanty at live dot com> ---
Comment on attachment 47559
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47559
An untested patch
>From 1dfd714e1f29e229d69a0c7f6f84bf05dd4ee85d Mon Sep 17 00:00:00 2001
>From: expnkx <unlvsur@live.com>
>Date: Sun, 29 Dec 2019 09:49:19 -0500
>Subject: [PATCH] Untested patch fix volatile bug of std::copyXXX and
> std::uninitialized_copyXXX Support custom contiguous_iterator Fix undefined
> behavior of &*end constexpr std::fill Greatly improve performance of
> std::copyXXX and std::uninitialized_copyXX for different types and apply
> pipeline optimization to reduce branch misprediction
>
>---
> libstdc++-v3/include/bits/stl_algobase.h | 170 ++++++++++++++++++++---
> 1 file changed, 148 insertions(+), 22 deletions(-)
>
>diff --git a/libstdc++-v3/include/bits/stl_algobase.h b/libstdc++-v3/include/bits/stl_algobase.h
>index 40d056ae8d5..01672a8f232 100644
>--- a/libstdc++-v3/include/bits/stl_algobase.h
>+++ b/libstdc++-v3/include/bits/stl_algobase.h
>@@ -1,6 +1,6 @@
> // Core algorithmic facilities -*- C++ -*-
>
>-// Copyright (C) 2001-2019 Free Software Foundation, Inc.
>+// Copyright (C) 2001-2020 Free Software Foundation, Inc.
> //
> // This file is part of the GNU ISO C++ Library. This library is free
> // software; you can redistribute it and/or modify it under the
>@@ -84,10 +84,37 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> * A constexpr wrapper for __builtin_memmove.
> * @param __num The number of elements of type _Tp (not bytes).
> */
>+#ifndef __cpp_lib_concepts
> template<bool _IsMove, typename _Tp>
>+ _GLIBCXX14_CONSTEXPR
>+ inline void volatile*
>+ __memmove(_Tp volatile* __dst, _Tp volatile const* __src, size_t __num)
>+ {
>+ for(; __num > 0; --__num)
>+ {
>+#if __cplusplus >= 201103L
>+ if constexpr (_IsMove)
>+ *__dst = std::move(*__src);
>+ else
>+#endif
>+ *__dst = *__src;
>+ ++__src;
>+ ++__dst;
>+ }
>+ return __dst;
>+ }
>+#endif
>+ template<bool _IsMove, typename _Tp,typename _Tp_src>
>+/*
>+#ifdef __cpp_lib_concepts
>+ requires (is_trivially_copyable_v<_Tp>&&!is_volatile_v<_Tp>
>+ &&is_trivially_copyable_v<_Tp_src>&&!is_volatile_v<_Tp_src>
>+ &&(same_as<_Tp,_Tp_src>||(sizeof(_Tp)==sizeof(_Tp_src)&&integral<_Tp>&&integral<_Tp_src>)))
>+#endif
>+*/
> _GLIBCXX14_CONSTEXPR
> inline void*
>- __memmove(_Tp* __dst, const _Tp* __src, size_t __num)
>+ __memmove(_Tp* __dst, _Tp_src const* __src, size_t __num)
> {
> #ifdef __cpp_lib_is_constant_evaluated
> if (std::is_constant_evaluated())
>@@ -106,9 +133,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> else
> #endif
> return __builtin_memmove(__dst, __src, sizeof(_Tp) * __num);
>- return __dst;
> }
>-
> /*
> * A constexpr wrapper for __builtin_memcmp.
> * @param __num The number of elements of type _Tp (not bytes).
>@@ -431,7 +456,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> }
> };
> #endif
>-
>+#ifndef __cpp_lib_concepts
> template<bool _IsMove>
> struct __copy_move<_IsMove, true, random_access_iterator_tag>
> {
>@@ -448,12 +473,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> static_assert( __assignable::type::value, "type is not assignable" );
> #endif
> const ptrdiff_t _Num = __last - __first;
>- if (_Num)
>- std::__memmove<_IsMove>(__result, __first, _Num);
>+ if (!_Num)
>+ return __result + _Num;
>+//since before C++20, we do not have [[likely]] attribute. We need to do it manually
>+ std::__memmove<_IsMove>(__result, __first, _Num);
> return __result + _Num;
> }
> };
>-
>+#endif
> // Helpers for streambuf iterators (either istream or ostream).
> // NB: avoid including <iosfwd>, relatively large.
> template<typename _CharT>
>@@ -491,11 +518,41 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> typedef typename iterator_traits<_II>::value_type _ValueTypeI;
> typedef typename iterator_traits<_OI>::value_type _ValueTypeO;
> typedef typename iterator_traits<_II>::iterator_category _Category;
>+#ifdef __cpp_lib_concepts
>+ if constexpr(
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__first)>>)&&
>+ is_trivially_copyable_v<_ValueTypeI>)&&
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__result)>>)&&
>+ is_trivially_copyable_v<_ValueTypeO>)&&
>+ contiguous_iterator<_II>&&
>+ contiguous_iterator<_OI>&&
>+ (same_as<_ValueTypeI,_ValueTypeO>
>+ ||(integral<_ValueTypeI>&&integral<_ValueTypeO>&&
>+ sizeof(_ValueTypeI)==sizeof(_ValueTypeO))))
>+ {
>+ using __assignable = conditional<_IsMove,
>+ is_move_assignable<_OI>,
>+ is_copy_assignable<_OI>>;
>+ static_assert( __assignable::type::value, "result type is not assignable" );
>+ ptrdiff_t const _Num = __last - __first;
>+ if (_Num)
>+#ifdef __has_cpp_attribute(likely)
>+//This if statement is by default bad since it affects CPU pipeline.
>+//needs likely attribute or the branch misprediction penalty (100% misprediction rate probably) is HUGE
>+ [[likely]]
>+#endif
>+ std::__memmove<_IsMove>(to_address(__result), to_address(__first), _Num);
>+ return __result + _Num;
>+ }
>+ else
>+ return std::__copy_move<_IsMove, false,
>+#else
> const bool __simple = (__is_trivially_copyable(_ValueTypeI)
> && __is_pointer<_II>::__value
> && __is_pointer<_OI>::__value
> && __are_same<_ValueTypeI, _ValueTypeO>::__value);
> return std::__copy_move<_IsMove, __simple,
>+#endif
> _Category>::__copy_m(__first, __last, __result);
> }
>
>@@ -581,6 +638,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> * Note that the end of the output range is permitted to be contained
> * within [first,last).
> */
>+
> template<typename _II, typename _OI>
> _GLIBCXX20_CONSTEXPR
> inline _OI
>@@ -595,7 +653,6 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> return std::__copy_move_a<__is_move_iterator<_II>::__value>
> (std::__miter_base(__first), std::__miter_base(__last), __result);
> }
>-
> #if __cplusplus >= 201103L
> /**
> * @brief Moves the range [first,last) into result.
>@@ -698,6 +755,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> };
> #endif
>
>+#ifndef __cpp_lib_concepts
> template<bool _IsMove>
> struct __copy_move_backward<_IsMove, true, random_access_iterator_tag>
> {
>@@ -714,11 +772,13 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> static_assert( __assignable::type::value, "type is not assignable" );
> #endif
> const ptrdiff_t _Num = __last - __first;
>- if (_Num)
>- std::__memmove<_IsMove>(__result - _Num, __first, _Num);
>+ if (!_Num)
>+ return __result - _Num;
>+ std::__memmove<_IsMove>(__result - _Num, __first, _Num);
> return __result - _Num;
> }
> };
>+#endif
>
> template<bool _IsMove, typename _BI1, typename _BI2>
> _GLIBCXX20_CONSTEXPR
>@@ -728,21 +788,56 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> typedef typename iterator_traits<_BI1>::value_type _ValueType1;
> typedef typename iterator_traits<_BI2>::value_type _ValueType2;
> typedef typename iterator_traits<_BI1>::iterator_category _Category;
>- const bool __simple = (__is_trivially_copyable(_ValueType1)
>- && __is_pointer<_BI1>::__value
>- && __is_pointer<_BI2>::__value
>- && __are_same<_ValueType1, _ValueType2>::__value);
>-
> #ifdef __cpp_lib_is_constant_evaluated
> if (std::is_constant_evaluated())
>- return std::__copy_move_backward<true, false,
>+ return std::__copy_move_backward<true, false,
> _Category>::__copy_move_b(__first, __last,
> __result);
>+ else
>+ {
> #endif
>+#if __cpp_lib_concepts
>+ if constexpr(
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__first)>>)&&
>+ is_trivially_copyable_v<_ValueType1>)&&
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__result)>>)&&
>+ is_trivially_copyable_v<_ValueType2>)&&
>+ contiguous_iterator<_BI1>&&
>+ contiguous_iterator<_BI2>&&
>+ (same_as<_ValueType1,_ValueType2>
>+ ||(integral<_ValueType1>&&integral<_ValueType2>&&
>+ sizeof(_ValueType1)==sizeof(_ValueType2))))
>+ {
>+ using __assignable = conditional<_IsMove,
>+ is_move_assignable<_ValueType2>,
>+ is_copy_assignable<_ValueType2>>;
>+ // trivial types can have deleted assignment
>+ static_assert( __assignable::type::value, "type is not assignable" );
>+ ptrdiff_t const _Num = __last - __first;
>+ if (_Num)
>+ #ifdef __has_cpp_attribute(likely)
>+ [[likely]]
>+ #endif
>+ std::__memmove<_IsMove>(to_address(__result) - _Num, to_address(__first), _Num);
>+ return __result - _Num;
>+ }
>+#else
>+ const bool __simple = (
>+#if __cplusplus >= 201103L
>+ (!is_volatile<typename std::remove_reference<decltype(*__first)>::type>::value)&&
>+#endif
>+ __is_trivially_copyable(_ValueType1)
>+ && __is_pointer<_BI1>::__value
>+ && __is_pointer<_BI2>::__value
>+ && __are_same<_ValueType1, _ValueType2>::__value);
> return std::__copy_move_backward<_IsMove, __simple,
> _Category>::__copy_move_b(__first,
> __last,
> __result);
>+#endif
>+#ifdef __cpp_lib_is_constant_evaluated
>+ }
>+#endif
> }
>
> template<bool _IsMove, typename _BI1, typename _BI2>
>@@ -908,16 +1003,33 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> }
>
> // Specialization: for char types we can use memset.
>+
> template<typename _Tp>
>+ _GLIBCXX20_CONSTEXPR
> inline typename
> __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, void>::__type
> __fill_a1(_Tp* __first, _Tp* __last, const _Tp& __c)
> {
>- const _Tp __tmp = __c;
>+ _Tp const __tmp = __c;
>+#ifdef __cpp_lib_is_constant_evaluated
>+ if (std::is_constant_evaluated())
>+ {
>+ for (; __first != __last; ++__first)
>+ *__first = __tmp;
>+ }
>+ else
>+ {
>+#endif
> if (const size_t __len = __last - __first)
>+#ifdef __has_cpp_attribute(likely)
>+ [[likely]]
>+#endif
> __builtin_memset(__first, static_cast<unsigned char>(__tmp), __len);
>+#ifdef __cpp_lib_is_constant_evaluated
> }
>-
>+#endif
>+ }
>+#ifndef __cpp_lib_concepts
> template<typename _Ite, typename _Cont, typename _Tp>
> _GLIBCXX20_CONSTEXPR
> inline void
>@@ -925,7 +1037,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> ::__gnu_cxx::__normal_iterator<_Ite, _Cont> __last,
> const _Tp& __value)
> { std::__fill_a1(__first.base(), __last.base(), __value); }
>-
>+#endif
> template<typename _Tp, typename _VTp>
> void
> __fill_a1(const _GLIBCXX_STD_C::_Deque_iterator<_Tp, _Tp&, _Tp*>&,
>@@ -936,7 +1048,14 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> _GLIBCXX20_CONSTEXPR
> inline void
> __fill_a(_FIte __first, _FIte __last, const _Tp& __value)
>- { std::__fill_a1(__first, __last, __value); }
>+ {
>+#ifdef __cpp_lib_concepts
>+ if constexpr(contiguous_iterator<_FIte>)
>+ std::__fill_a1(to_address(__first), to_address(__last), __value);
>+ else
>+#endif
>+ std::__fill_a1(__first, __last, __value);
>+ }
>
> template<typename _Ite, typename _Seq, typename _Cat, typename _Tp>
> void
>@@ -1306,6 +1425,9 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> const size_t __len1 = __last1 - __first1;
> const size_t __len2 = __last2 - __first2;
> if (const size_t __len = std::min(__len1, __len2))
>+#ifdef __has_cpp_attribute(likely)
>+ [[likely]]
>+#endif
> if (int __result = std::__memcmp(__first1, __first2, __len))
> return __result < 0;
> return __len1 < __len2;
>@@ -1733,7 +1855,11 @@ _GLIBCXX_BEGIN_NAMESPACE_ALGO
> if (__len)
> {
> const auto __c
>- = __builtin_memcmp(&*__first1, &*__first2, __len) <=> 0;
>+ = __builtin_memcmp(to_address(__first1), to_address(__first2), __len) <=> 0;
>+//&*__first1 is not correct and would crash program. Must use to_address()
>+//since a lot of debugging iterator would not be allowed to dereference __first2.
>+//It is undefined behavior to derefernce sentinal iterators
>+//For example, VC's implementation
> if (__c != 0)
> return __c;
> }
>--
>2.24.0.windows.2
>
>From gcc-bugs-return-664147-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 15:07:08 2019
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Subject: [Bug libstdc++/93059] char and char8_t does not talk with each other with memcpy. std::copy std::copy_n, std::fill, std::fill_n, std::uninitialized_copy std::uninitialized_copy_n, std::fill, std::uninitialized_fill_n fails to convert to memxxx functions
Date: Sun, 29 Dec 2019 15:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93059
--- Comment #23 from fdlbxtqi <euloanty at live dot com> ---
Comment on attachment 47559
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47559
An untested patch
>From 1dfd714e1f29e229d69a0c7f6f84bf05dd4ee85d Mon Sep 17 00:00:00 2001
>From: expnkx <unlvsur@live.com>
>Date: Sun, 29 Dec 2019 09:49:19 -0500
>Subject: [PATCH] Untested patch fix volatile bug of std::copyXXX and
> std::uninitialized_copyXXX Support custom contiguous_iterator Fix undefined
> behavior of &*end constexpr std::fill Greatly improve performance of
> std::copyXXX and std::uninitialized_copyXX for different types and apply
> pipeline optimization to reduce branch misprediction
>
>---
> libstdc++-v3/include/bits/stl_algobase.h | 170 ++++++++++++++++++++---
> 1 file changed, 148 insertions(+), 22 deletions(-)
>
>diff --git a/libstdc++-v3/include/bits/stl_algobase.h b/libstdc++-v3/include/bits/stl_algobase.h
>index 40d056ae8d5..01672a8f232 100644
>--- a/libstdc++-v3/include/bits/stl_algobase.h
>+++ b/libstdc++-v3/include/bits/stl_algobase.h
>@@ -1,6 +1,6 @@
> // Core algorithmic facilities -*- C++ -*-
>
>-// Copyright (C) 2001-2019 Free Software Foundation, Inc.
>+// Copyright (C) 2001-2020 Free Software Foundation, Inc.
> //
> // This file is part of the GNU ISO C++ Library. This library is free
> // software; you can redistribute it and/or modify it under the
>@@ -84,10 +84,37 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> * A constexpr wrapper for __builtin_memmove.
> * @param __num The number of elements of type _Tp (not bytes).
> */
>+#ifndef __cpp_lib_concepts
> template<bool _IsMove, typename _Tp>
>+ _GLIBCXX14_CONSTEXPR
>+ inline void volatile*
>+ __memmove(_Tp volatile* __dst, _Tp volatile const* __src, size_t __num)
>+ {
>+ for(; __num > 0; --__num)
>+ {
>+#if __cplusplus >= 201103L
>+ if constexpr (_IsMove)
>+ *__dst = std::move(*__src);
>+ else
>+#endif
>+ *__dst = *__src;
>+ ++__src;
>+ ++__dst;
>+ }
>+ return __dst;
>+ }
>+#endif
>+ template<bool _IsMove, typename _Tp,typename _Tp_src>
>+/*
>+#ifdef __cpp_lib_concepts
>+ requires (is_trivially_copyable_v<_Tp>&&!is_volatile_v<_Tp>
>+ &&is_trivially_copyable_v<_Tp_src>&&!is_volatile_v<_Tp_src>
>+ &&(same_as<_Tp,_Tp_src>||(sizeof(_Tp)==sizeof(_Tp_src)&&integral<_Tp>&&integral<_Tp_src>)))
>+#endif
>+*/
> _GLIBCXX14_CONSTEXPR
> inline void*
>- __memmove(_Tp* __dst, const _Tp* __src, size_t __num)
>+ __memmove(_Tp* __dst, _Tp_src const* __src, size_t __num)
> {
> #ifdef __cpp_lib_is_constant_evaluated
> if (std::is_constant_evaluated())
>@@ -106,9 +133,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> else
> #endif
> return __builtin_memmove(__dst, __src, sizeof(_Tp) * __num);
>- return __dst;
> }
>-
> /*
> * A constexpr wrapper for __builtin_memcmp.
> * @param __num The number of elements of type _Tp (not bytes).
>@@ -431,7 +456,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> }
> };
> #endif
>-
>+#ifndef __cpp_lib_concepts
> template<bool _IsMove>
> struct __copy_move<_IsMove, true, random_access_iterator_tag>
> {
>@@ -448,12 +473,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> static_assert( __assignable::type::value, "type is not assignable" );
> #endif
> const ptrdiff_t _Num = __last - __first;
>- if (_Num)
>- std::__memmove<_IsMove>(__result, __first, _Num);
>+ if (!_Num)
>+ return __result + _Num;
>+//since before C++20, we do not have [[likely]] attribute. We need to do it manually
>+ std::__memmove<_IsMove>(__result, __first, _Num);
> return __result + _Num;
> }
> };
>-
>+#endif
> // Helpers for streambuf iterators (either istream or ostream).
> // NB: avoid including <iosfwd>, relatively large.
> template<typename _CharT>
>@@ -491,11 +518,41 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> typedef typename iterator_traits<_II>::value_type _ValueTypeI;
> typedef typename iterator_traits<_OI>::value_type _ValueTypeO;
> typedef typename iterator_traits<_II>::iterator_category _Category;
>+#ifdef __cpp_lib_concepts
>+ if constexpr(
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__first)>>)&&
>+ is_trivially_copyable_v<_ValueTypeI>)&&
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__result)>>)&&
>+ is_trivially_copyable_v<_ValueTypeO>)&&
>+ contiguous_iterator<_II>&&
>+ contiguous_iterator<_OI>&&
>+ (same_as<_ValueTypeI,_ValueTypeO>
>+ ||(integral<_ValueTypeI>&&integral<_ValueTypeO>&&
>+ sizeof(_ValueTypeI)==sizeof(_ValueTypeO))))
>+ {
>+ using __assignable = conditional<_IsMove,
>+ is_move_assignable<_OI>,
>+ is_copy_assignable<_OI>>;
>+ static_assert( __assignable::type::value, "result type is not assignable" );
>+ ptrdiff_t const _Num = __last - __first;
>+ if (_Num)
>+#ifdef __has_cpp_attribute(likely)
>+//This if statement is by default bad since it affects CPU pipeline.
>+//needs likely attribute or the branch misprediction penalty (100% misprediction rate probably) is HUGE
>+ [[likely]]
>+#endif
>+ std::__memmove<_IsMove>(to_address(__result), to_address(__first), _Num);
>+ return __result + _Num;
>+ }
>+ else
>+ return std::__copy_move<_IsMove, false,
>+#else
> const bool __simple = (__is_trivially_copyable(_ValueTypeI)
> && __is_pointer<_II>::__value
> && __is_pointer<_OI>::__value
> && __are_same<_ValueTypeI, _ValueTypeO>::__value);
> return std::__copy_move<_IsMove, __simple,
>+#endif
> _Category>::__copy_m(__first, __last, __result);
> }
>
>@@ -581,6 +638,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> * Note that the end of the output range is permitted to be contained
> * within [first,last).
> */
>+
> template<typename _II, typename _OI>
> _GLIBCXX20_CONSTEXPR
> inline _OI
>@@ -595,7 +653,6 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> return std::__copy_move_a<__is_move_iterator<_II>::__value>
> (std::__miter_base(__first), std::__miter_base(__last), __result);
> }
>-
> #if __cplusplus >= 201103L
> /**
> * @brief Moves the range [first,last) into result.
>@@ -698,6 +755,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> };
> #endif
>
>+#ifndef __cpp_lib_concepts
> template<bool _IsMove>
> struct __copy_move_backward<_IsMove, true, random_access_iterator_tag>
> {
>@@ -714,11 +772,13 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> static_assert( __assignable::type::value, "type is not assignable" );
> #endif
> const ptrdiff_t _Num = __last - __first;
>- if (_Num)
>- std::__memmove<_IsMove>(__result - _Num, __first, _Num);
>+ if (!_Num)
>+ return __result - _Num;
>+ std::__memmove<_IsMove>(__result - _Num, __first, _Num);
> return __result - _Num;
> }
> };
>+#endif
>
> template<bool _IsMove, typename _BI1, typename _BI2>
> _GLIBCXX20_CONSTEXPR
>@@ -728,21 +788,56 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> typedef typename iterator_traits<_BI1>::value_type _ValueType1;
> typedef typename iterator_traits<_BI2>::value_type _ValueType2;
> typedef typename iterator_traits<_BI1>::iterator_category _Category;
>- const bool __simple = (__is_trivially_copyable(_ValueType1)
>- && __is_pointer<_BI1>::__value
>- && __is_pointer<_BI2>::__value
>- && __are_same<_ValueType1, _ValueType2>::__value);
>-
> #ifdef __cpp_lib_is_constant_evaluated
> if (std::is_constant_evaluated())
>- return std::__copy_move_backward<true, false,
>+ return std::__copy_move_backward<true, false,
> _Category>::__copy_move_b(__first, __last,
> __result);
>+ else
>+ {
> #endif
>+#if __cpp_lib_concepts
>+ if constexpr(
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__first)>>)&&
>+ is_trivially_copyable_v<_ValueType1>)&&
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__result)>>)&&
>+ is_trivially_copyable_v<_ValueType2>)&&
>+ contiguous_iterator<_BI1>&&
>+ contiguous_iterator<_BI2>&&
>+ (same_as<_ValueType1,_ValueType2>
>+ ||(integral<_ValueType1>&&integral<_ValueType2>&&
>+ sizeof(_ValueType1)==sizeof(_ValueType2))))
>+ {
>+ using __assignable = conditional<_IsMove,
>+ is_move_assignable<_ValueType2>,
>+ is_copy_assignable<_ValueType2>>;
>+ // trivial types can have deleted assignment
>+ static_assert( __assignable::type::value, "type is not assignable" );
>+ ptrdiff_t const _Num = __last - __first;
>+ if (_Num)
>+ #ifdef __has_cpp_attribute(likely)
>+ [[likely]]
>+ #endif
>+ std::__memmove<_IsMove>(to_address(__result) - _Num, to_address(__first), _Num);
>+ return __result - _Num;
>+ }
>+#else
>+ const bool __simple = (
>+#if __cplusplus >= 201103L
>+ (!is_volatile<typename std::remove_reference<decltype(*__first)>::type>::value)&&
>+#endif
>+ __is_trivially_copyable(_ValueType1)
>+ && __is_pointer<_BI1>::__value
>+ && __is_pointer<_BI2>::__value
>+ && __are_same<_ValueType1, _ValueType2>::__value);
> return std::__copy_move_backward<_IsMove, __simple,
> _Category>::__copy_move_b(__first,
> __last,
> __result);
>+#endif
>+#ifdef __cpp_lib_is_constant_evaluated
>+ }
>+#endif
> }
>
> template<bool _IsMove, typename _BI1, typename _BI2>
>@@ -908,16 +1003,33 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> }
>
> // Specialization: for char types we can use memset.
>+
> template<typename _Tp>
>+ _GLIBCXX20_CONSTEXPR
> inline typename
> __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, void>::__type
> __fill_a1(_Tp* __first, _Tp* __last, const _Tp& __c)
> {
>- const _Tp __tmp = __c;
>+ _Tp const __tmp = __c;
>+#ifdef __cpp_lib_is_constant_evaluated
>+ if (std::is_constant_evaluated())
>+ {
>+ for (; __first != __last; ++__first)
>+ *__first = __tmp;
>+ }
>+ else
>+ {
>+#endif
> if (const size_t __len = __last - __first)
>+#ifdef __has_cpp_attribute(likely)
>+ [[likely]]
>+#endif
> __builtin_memset(__first, static_cast<unsigned char>(__tmp), __len);
>+#ifdef __cpp_lib_is_constant_evaluated
> }
>-
>+#endif
>+ }
>+#ifndef __cpp_lib_concepts
> template<typename _Ite, typename _Cont, typename _Tp>
> _GLIBCXX20_CONSTEXPR
> inline void
>@@ -925,7 +1037,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> ::__gnu_cxx::__normal_iterator<_Ite, _Cont> __last,
> const _Tp& __value)
> { std::__fill_a1(__first.base(), __last.base(), __value); }
>-
>+#endif
> template<typename _Tp, typename _VTp>
> void
> __fill_a1(const _GLIBCXX_STD_C::_Deque_iterator<_Tp, _Tp&, _Tp*>&,
>@@ -936,7 +1048,14 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> _GLIBCXX20_CONSTEXPR
> inline void
> __fill_a(_FIte __first, _FIte __last, const _Tp& __value)
>- { std::__fill_a1(__first, __last, __value); }
>+ {
>+#ifdef __cpp_lib_concepts
>+ if constexpr(contiguous_iterator<_FIte>)
>+ std::__fill_a1(to_address(__first), to_address(__last), __value);
>+ else
>+#endif
>+ std::__fill_a1(__first, __last, __value);
>+ }
>
> template<typename _Ite, typename _Seq, typename _Cat, typename _Tp>
> void
>@@ -1306,6 +1425,9 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> const size_t __len1 = __last1 - __first1;
> const size_t __len2 = __last2 - __first2;
> if (const size_t __len = std::min(__len1, __len2))
>+#ifdef __has_cpp_attribute(likely)
>+ [[likely]]
>+#endif
> if (int __result = std::__memcmp(__first1, __first2, __len))
> return __result < 0;
> return __len1 < __len2;
>@@ -1733,7 +1855,11 @@ _GLIBCXX_BEGIN_NAMESPACE_ALGO
> if (__len)
> {
> const auto __c
>- = __builtin_memcmp(&*__first1, &*__first2, __len) <=> 0;
>+ = __builtin_memcmp(to_address(__first1), to_address(__first2), __len) <=> 0;
>+//&*__first1 is not correct and would crash program. Must use to_address()
>+//since a lot of debugging iterator would not be allowed to dereference __first2.
>+//It is undefined behavior to derefernce sentinal iterators
>+//For example, VC's implementation
> if (__c != 0)
> return __c;
> }
>--
>2.24.0.windows.2
>
>From gcc-bugs-return-664148-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 15:07:24 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/93059] char and char8_t does not talk with each other with memcpy. std::copy std::copy_n, std::fill, std::fill_n, std::uninitialized_copy std::uninitialized_copy_n, std::fill, std::uninitialized_fill_n fails to convert to memxxx functions
Date: Sun, 29 Dec 2019 15:07:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93059
--- Comment #24 from fdlbxtqi <euloanty at live dot com> ---
Comment on attachment 47559
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47559
An untested patch
>From 1dfd714e1f29e229d69a0c7f6f84bf05dd4ee85d Mon Sep 17 00:00:00 2001
>From: expnkx <unlvsur@live.com>
>Date: Sun, 29 Dec 2019 09:49:19 -0500
>Subject: [PATCH] Untested patch fix volatile bug of std::copyXXX and
> std::uninitialized_copyXXX Support custom contiguous_iterator Fix undefined
> behavior of &*end constexpr std::fill Greatly improve performance of
> std::copyXXX and std::uninitialized_copyXX for different types and apply
> pipeline optimization to reduce branch misprediction
>
>---
> libstdc++-v3/include/bits/stl_algobase.h | 170 ++++++++++++++++++++---
> 1 file changed, 148 insertions(+), 22 deletions(-)
>
>diff --git a/libstdc++-v3/include/bits/stl_algobase.h b/libstdc++-v3/include/bits/stl_algobase.h
>index 40d056ae8d5..01672a8f232 100644
>--- a/libstdc++-v3/include/bits/stl_algobase.h
>+++ b/libstdc++-v3/include/bits/stl_algobase.h
>@@ -1,6 +1,6 @@
> // Core algorithmic facilities -*- C++ -*-
>
>-// Copyright (C) 2001-2019 Free Software Foundation, Inc.
>+// Copyright (C) 2001-2020 Free Software Foundation, Inc.
> //
> // This file is part of the GNU ISO C++ Library. This library is free
> // software; you can redistribute it and/or modify it under the
>@@ -84,10 +84,37 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> * A constexpr wrapper for __builtin_memmove.
> * @param __num The number of elements of type _Tp (not bytes).
> */
>+#ifndef __cpp_lib_concepts
> template<bool _IsMove, typename _Tp>
>+ _GLIBCXX14_CONSTEXPR
>+ inline void volatile*
>+ __memmove(_Tp volatile* __dst, _Tp volatile const* __src, size_t __num)
>+ {
>+ for(; __num > 0; --__num)
>+ {
>+#if __cplusplus >= 201103L
>+ if constexpr (_IsMove)
>+ *__dst = std::move(*__src);
>+ else
>+#endif
>+ *__dst = *__src;
>+ ++__src;
>+ ++__dst;
>+ }
>+ return __dst;
>+ }
>+#endif
>+ template<bool _IsMove, typename _Tp,typename _Tp_src>
>+/*
>+#ifdef __cpp_lib_concepts
>+ requires (is_trivially_copyable_v<_Tp>&&!is_volatile_v<_Tp>
>+ &&is_trivially_copyable_v<_Tp_src>&&!is_volatile_v<_Tp_src>
>+ &&(same_as<_Tp,_Tp_src>||(sizeof(_Tp)==sizeof(_Tp_src)&&integral<_Tp>&&integral<_Tp_src>)))
>+#endif
>+*/
> _GLIBCXX14_CONSTEXPR
> inline void*
>- __memmove(_Tp* __dst, const _Tp* __src, size_t __num)
>+ __memmove(_Tp* __dst, _Tp_src const* __src, size_t __num)
> {
> #ifdef __cpp_lib_is_constant_evaluated
> if (std::is_constant_evaluated())
>@@ -106,9 +133,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> else
> #endif
> return __builtin_memmove(__dst, __src, sizeof(_Tp) * __num);
>- return __dst;
> }
>-
> /*
> * A constexpr wrapper for __builtin_memcmp.
> * @param __num The number of elements of type _Tp (not bytes).
>@@ -431,7 +456,7 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> }
> };
> #endif
>-
>+#ifndef __cpp_lib_concepts
> template<bool _IsMove>
> struct __copy_move<_IsMove, true, random_access_iterator_tag>
> {
>@@ -448,12 +473,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> static_assert( __assignable::type::value, "type is not assignable" );
> #endif
> const ptrdiff_t _Num = __last - __first;
>- if (_Num)
>- std::__memmove<_IsMove>(__result, __first, _Num);
>+ if (!_Num)
>+ return __result + _Num;
>+//since before C++20, we do not have [[likely]] attribute. We need to do it manually
>+ std::__memmove<_IsMove>(__result, __first, _Num);
> return __result + _Num;
> }
> };
>-
>+#endif
> // Helpers for streambuf iterators (either istream or ostream).
> // NB: avoid including <iosfwd>, relatively large.
> template<typename _CharT>
>@@ -491,11 +518,41 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
> typedef typename iterator_traits<_II>::value_type _ValueTypeI;
> typedef typename iterator_traits<_OI>::value_type _ValueTypeO;
> typedef typename iterator_traits<_II>::iterator_category _Category;
>+#ifdef __cpp_lib_concepts
>+ if constexpr(
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__first)>>)&&
>+ is_trivially_copyable_v<_ValueTypeI>)&&
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__result)>>)&&
>+ is_trivially_copyable_v<_ValueTypeO>)&&
>+ contiguous_iterator<_II>&&
>+ contiguous_iterator<_OI>&&
>+ (same_as<_ValueTypeI,_ValueTypeO>
>+ ||(integral<_ValueTypeI>&&integral<_ValueTypeO>&&
>+ sizeof(_ValueTypeI)==sizeof(_ValueTypeO))))
>+ {
>+ using __assignable = conditional<_IsMove,
>+ is_move_assignable<_OI>,
>+ is_copy_assignable<_OI>>;
>+ static_assert( __assignable::type::value, "result type is not assignable" );
>+ ptrdiff_t const _Num = __last - __first;
>+ if (_Num)
>+#ifdef __has_cpp_attribute(likely)
>+//This if statement is by default bad since it affects CPU pipeline.
>+//needs likely attribute or the branch misprediction penalty (100% misprediction rate probably) is HUGE
>+ [[likely]]
>+#endif
>+ std::__memmove<_IsMove>(to_address(__result), to_address(__first), _Num);
>+ return __result + _Num;
>+ }
>+ else
>+ return std::__copy_move<_IsMove, false,
>+#else
> const bool __simple = (__is_trivially_copyable(_ValueTypeI)
> && __is_pointer<_II>::__value
> && __is_pointer<_OI>::__value
> && __are_same<_ValueTypeI, _ValueTypeO>::__value);
> return std::__copy_move<_IsMove, __simple,
>+#endif
> _Category>::__copy_m(__first, __last, __result);
> }
>
>@@ -581,6 +638,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> * Note that the end of the output range is permitted to be contained
> * within [first,last).
> */
>+
> template<typename _II, typename _OI>
> _GLIBCXX20_CONSTEXPR
> inline _OI
>@@ -595,7 +653,6 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> return std::__copy_move_a<__is_move_iterator<_II>::__value>
> (std::__miter_base(__first), std::__miter_base(__last), __result);
> }
>-
> #if __cplusplus >= 201103L
> /**
> * @brief Moves the range [first,last) into result.
>@@ -698,6 +755,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> };
> #endif
>
>+#ifndef __cpp_lib_concepts
> template<bool _IsMove>
> struct __copy_move_backward<_IsMove, true, random_access_iterator_tag>
> {
>@@ -714,11 +772,13 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> static_assert( __assignable::type::value, "type is not assignable" );
> #endif
> const ptrdiff_t _Num = __last - __first;
>- if (_Num)
>- std::__memmove<_IsMove>(__result - _Num, __first, _Num);
>+ if (!_Num)
>+ return __result - _Num;
>+ std::__memmove<_IsMove>(__result - _Num, __first, _Num);
> return __result - _Num;
> }
> };
>+#endif
>
> template<bool _IsMove, typename _BI1, typename _BI2>
> _GLIBCXX20_CONSTEXPR
>@@ -728,21 +788,56 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> typedef typename iterator_traits<_BI1>::value_type _ValueType1;
> typedef typename iterator_traits<_BI2>::value_type _ValueType2;
> typedef typename iterator_traits<_BI1>::iterator_category _Category;
>- const bool __simple = (__is_trivially_copyable(_ValueType1)
>- && __is_pointer<_BI1>::__value
>- && __is_pointer<_BI2>::__value
>- && __are_same<_ValueType1, _ValueType2>::__value);
>-
> #ifdef __cpp_lib_is_constant_evaluated
> if (std::is_constant_evaluated())
>- return std::__copy_move_backward<true, false,
>+ return std::__copy_move_backward<true, false,
> _Category>::__copy_move_b(__first, __last,
> __result);
>+ else
>+ {
> #endif
>+#if __cpp_lib_concepts
>+ if constexpr(
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__first)>>)&&
>+ is_trivially_copyable_v<_ValueType1>)&&
>+ ((!is_volatile_v<std::remove_reference_t<decltype(*__result)>>)&&
>+ is_trivially_copyable_v<_ValueType2>)&&
>+ contiguous_iterator<_BI1>&&
>+ contiguous_iterator<_BI2>&&
>+ (same_as<_ValueType1,_ValueType2>
>+ ||(integral<_ValueType1>&&integral<_ValueType2>&&
>+ sizeof(_ValueType1)==sizeof(_ValueType2))))
>+ {
>+ using __assignable = conditional<_IsMove,
>+ is_move_assignable<_ValueType2>,
>+ is_copy_assignable<_ValueType2>>;
>+ // trivial types can have deleted assignment
>+ static_assert( __assignable::type::value, "type is not assignable" );
>+ ptrdiff_t const _Num = __last - __first;
>+ if (_Num)
>+ #ifdef __has_cpp_attribute(likely)
>+ [[likely]]
>+ #endif
>+ std::__memmove<_IsMove>(to_address(__result) - _Num, to_address(__first), _Num);
>+ return __result - _Num;
>+ }
>+#else
>+ const bool __simple = (
>+#if __cplusplus >= 201103L
>+ (!is_volatile<typename std::remove_reference<decltype(*__first)>::type>::value)&&
>+#endif
>+ __is_trivially_copyable(_ValueType1)
>+ && __is_pointer<_BI1>::__value
>+ && __is_pointer<_BI2>::__value
>+ && __are_same<_ValueType1, _ValueType2>::__value);
> return std::__copy_move_backward<_IsMove, __simple,
> _Category>::__copy_move_b(__first,
> __last,
> __result);
>+#endif
>+#ifdef __cpp_lib_is_constant_evaluated
>+ }
>+#endif
> }
>
> template<bool _IsMove, typename _BI1, typename _BI2>
>@@ -908,16 +1003,33 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> }
>
> // Specialization: for char types we can use memset.
>+
> template<typename _Tp>
>+ _GLIBCXX20_CONSTEXPR
> inline typename
> __gnu_cxx::__enable_if<__is_byte<_Tp>::__value, void>::__type
> __fill_a1(_Tp* __first, _Tp* __last, const _Tp& __c)
> {
>- const _Tp __tmp = __c;
>+ _Tp const __tmp = __c;
>+#ifdef __cpp_lib_is_constant_evaluated
>+ if (std::is_constant_evaluated())
>+ {
>+ for (; __first != __last; ++__first)
>+ *__first = __tmp;
>+ }
>+ else
>+ {
>+#endif
> if (const size_t __len = __last - __first)
>+#ifdef __has_cpp_attribute(likely)
>+ [[likely]]
>+#endif
> __builtin_memset(__first, static_cast<unsigned char>(__tmp), __len);
>+#ifdef __cpp_lib_is_constant_evaluated
> }
>-
>+#endif
>+ }
>+#ifndef __cpp_lib_concepts
> template<typename _Ite, typename _Cont, typename _Tp>
> _GLIBCXX20_CONSTEXPR
> inline void
>@@ -925,7 +1037,7 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> ::__gnu_cxx::__normal_iterator<_Ite, _Cont> __last,
> const _Tp& __value)
> { std::__fill_a1(__first.base(), __last.base(), __value); }
>-
>+#endif
> template<typename _Tp, typename _VTp>
> void
> __fill_a1(const _GLIBCXX_STD_C::_Deque_iterator<_Tp, _Tp&, _Tp*>&,
>@@ -936,7 +1048,14 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> _GLIBCXX20_CONSTEXPR
> inline void
> __fill_a(_FIte __first, _FIte __last, const _Tp& __value)
>- { std::__fill_a1(__first, __last, __value); }
>+ {
>+#ifdef __cpp_lib_concepts
>+ if constexpr(contiguous_iterator<_FIte>)
>+ std::__fill_a1(to_address(__first), to_address(__last), __value);
>+ else
>+#endif
>+ std::__fill_a1(__first, __last, __value);
>+ }
>
> template<typename _Ite, typename _Seq, typename _Cat, typename _Tp>
> void
>@@ -1306,6 +1425,9 @@ _GLIBCXX_END_NAMESPACE_CONTAINER
> const size_t __len1 = __last1 - __first1;
> const size_t __len2 = __last2 - __first2;
> if (const size_t __len = std::min(__len1, __len2))
>+#ifdef __has_cpp_attribute(likely)
>+ [[likely]]
>+#endif
> if (int __result = std::__memcmp(__first1, __first2, __len))
> return __result < 0;
> return __len1 < __len2;
>@@ -1733,7 +1855,11 @@ _GLIBCXX_BEGIN_NAMESPACE_ALGO
> if (__len)
> {
> const auto __c
>- = __builtin_memcmp(&*__first1, &*__first2, __len) <=> 0;
>+ = __builtin_memcmp(to_address(__first1), to_address(__first2), __len) <=> 0;
>+//&*__first1 is not correct and would crash program. Must use to_address()
>+//since a lot of debugging iterator would not be allowed to dereference __first2.
>+//It is undefined behavior to derefernce sentinal iterators
>+//For example, VC's implementation
> if (__c != 0)
> return __c;
> }
>--
>2.24.0.windows.2
>
>From gcc-bugs-return-664149-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 15:08:40 2019
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/93059] char and char8_t does not talk with each other with memcpy. std::copy std::copy_n, std::fill, std::fill_n, std::uninitialized_copy std::uninitialized_copy_n, std::fill, std::uninitialized_fill_n fails to convert to memxxx functions
Date: Sun, 29 Dec 2019 15:08:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93059
--- Comment #25 from fdlbxtqi <euloanty at live dot com> ---
Created attachment 47560
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47560&action=edit
forgot to_address
2nd patch
I am going to run testsuites
>From gcc-bugs-return-664150-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 15:43:59 2019
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Subject: =?UTF-8?B?W0J1ZyBjKysvOTMwOTVdIE5ldzogQnVpbGQgTGF0ZXN0IEdDQyBmYWlsIC4u?= =?UTF-8?B?Ly4uL2djYy9nY2MvZ2ltcGxlLWZvbGQuYzo0MTQ2Ojg6IGVycm9yOiBleHBl?= =?UTF-8?B?Y3RlZCB1bnF1YWxpZmllZC1pZCBiZWZvcmUg4oCYdGhyb3dz4oCZ?Date: Sun, 29 Dec 2019 15:43:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93095
Bug ID: 93095
Summary: Build Latest GCC fail
../../gcc/gcc/gimple-fold.c:4146:8: error: expected
unqualified-id before ‘throws’
Product: gcc
Version: 10.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: euloanty at live dot com
Target Milestone: ---
g++ -fno-PIE -c -g -O2 -DIN_GCC -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wno-error=format-diag -Wmissing-format-attribute
-Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -fno-common -DHAVE_CONFIG_H -I. -I. -I../../gcc/gcc
-I../../gcc/gcc/. -I../../gcc/gcc/../include -I../../gcc/gcc/../libcpp/include
-I/home/cqwrteur/gcc-build/./gmp -I/home/cqwrteur/gcc/gmp
-I/home/cqwrteur/gcc-build/./mpfr/src -I/home/cqwrteur/gcc/mpfr/src
-I/home/cqwrteur/gcc/mpc/src -I../../gcc/gcc/../libdecnumber
-I../../gcc/gcc/../libdecnumber/bid -I../libdecnumber
-I../../gcc/gcc/../libbacktrace -I/home/cqwrteur/gcc-build/./isl/include
-I/home/cqwrteur/gcc/isl/include -o gimple-loop-versioning.o -MT
gimple-loop-versioning.o -MMD -MP -MF ./.deps/gimple-loop-versioning.TPo
../../gcc/gcc/gimple-loop-versioning.cc
g++ -fno-PIE -c -g -O2 -DIN_GCC -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wno-error=format-diag -Wmissing-format-attribute
-Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -fno-common -DHAVE_CONFIG_H -I. -I. -I../../gcc/gcc
-I../../gcc/gcc/. -I../../gcc/gcc/../include -I../../gcc/gcc/../libcpp/include
-I/home/cqwrteur/gcc-build/./gmp -I/home/cqwrteur/gcc/gmp
-I/home/cqwrteur/gcc-build/./mpfr/src -I/home/cqwrteur/gcc/mpfr/src
-I/home/cqwrteur/gcc/mpc/src -I../../gcc/gcc/../libdecnumber
-I../../gcc/gcc/../libdecnumber/bid -I../libdecnumber
-I../../gcc/gcc/../libbacktrace -I/home/cqwrteur/gcc-build/./isl/include
-I/home/cqwrteur/gcc/isl/include -o gimple-low.o -MT gimple-low.o -MMD -MP -MF
./.deps/gimple-low.TPo ../../gcc/gcc/gimple-low.c
../../gcc/gcc/gimple-fold.c: In function ‘void
fold_builtin_atomic_compare_exchange(gimple_stmt_iterator*)’:
../../gcc/gcc/gimple-fold.c:4146:8: error: expected unqualified-id before
‘throws’
4146 | bool throws = false;
| ^~~~~~
../../gcc/gcc/gimple-fold.c:4174:7: error: expected primary-expression before
‘throws’
4174 | throws = true;
| ^~~~~~
../../gcc/gcc/gimple-fold.c:4185:11: error: expected primary-expression before
‘throws’
4185 | if (throws)
| ^~~~~~
../../gcc/gcc/gimple-fold.c:4185:11: error: expected ‘)’ before ‘throws’
4185 | if (throws)
| ~^~~~~~
| )
../../gcc/gcc/gimple-fold.c:4197:7: error: expected primary-expression before
‘throws’
4197 | if (throws && oldlhs == NULL_TREE)
| ^~~~~~
../../gcc/gcc/gimple-fold.c:4197:7: error: expected ‘)’ before ‘throws’
4197 | if (throws && oldlhs == NULL_TREE)
| ~^~~~~~
| )
g++ -fno-PIE -c -g -O2 -DIN_GCC -fno-exceptions -fno-rtti
-fasynchronous-unwind-tables -W -Wall -Wno-narrowing -Wwrite-strings
-Wcast-qual -Wno-error=format-diag -Wmissing-format-attribute
-Woverloaded-virtual -pedantic -Wno-long-long -Wno-variadic-macros
-Wno-overlength-strings -fno-common -DHAVE_CONFIG_H -I. -I. -I../../gcc/gcc
-I../../gcc/gcc/. -I../../gcc/gcc/../include -I../../gcc/gcc/../libcpp/include
-I/home/cqwrteur/gcc-build/./gmp -I/home/cqwrteur/gcc/gmp
-I/home/cqwrteur/gcc-build/./mpfr/src -I/home/cqwrteur/gcc/mpfr/src
-I/home/cqwrteur/gcc/mpc/src -I../../gcc/gcc/../libdecnumber
-I../../gcc/gcc/../libdecnumber/bid -I../libdecnumber
-I../../gcc/gcc/../libbacktrace -I/home/cqwrteur/gcc-build/./isl/include
-I/home/cqwrteur/gcc/isl/include -o gimple-pretty-print.o -MT
gimple-pretty-print.o -MMD -MP -MF ./.deps/gimple-pretty-print.TPo
../../gcc/gcc/gimple-pretty-print.c
Makefile:1117: recipe for target 'gimple-fold.o' failed
make[2]: *** [gimple-fold.o] Error 1
make[2]: *** Waiting for unfinished jobs....
In file included from ../../gcc/gcc/coretypes.h:444,
from ../../gcc/gcc/expmed.c:26:
../../gcc/gcc/machmode.h: In function ‘rtx_def* emit_store_flag_1(rtx,
rtx_code, rtx, rtx, machine_mode, int, int, machine_mode)’:
../../gcc/gcc/machmode.h:546:42: warning: ‘int_mode’ may be used uninitialized
in this function [-Wmaybe-uninitialized]
546 | ? mode_size_inline (mode) : mode_size[mode]);
| ^~~~
../../gcc/gcc/expmed.c:5623:19: note: ‘int_mode’ was declared here
5623 | scalar_int_mode int_mode;
| ^~~~~~~~
1make[2]: Leaving directory '/home/cqwrteur/gcc-build/gcc'
Makefile:4373: recipe for target 'all-gcc' failed
make[1]: *** [all-gcc] Error 2
make[1]: Leaving directory '/home/cqwrteur/gcc-build'
Makefile:966: recipe for target 'all' failed
make: *** [all] Error 2
>From gcc-bugs-return-664151-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 16:40:09 2019
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Subject: [Bug libgcc/92988] crtstuff.c:387:21: error: '__dso_handle' undeclared (first use in this function)
Date: Sun, 29 Dec 2019 16:40:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92988
--- Comment #1 from John David Anglin <danglin at gcc dot gnu.org> ---
Created attachment 47561
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47561&action=edit
Patch
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/88337] Implement P1002R1, P1327R1, P1330R0, C++20 relaxations of constexpr restrictions.
Date: Sun, 29 Dec 2019 16:45:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88337
--- Comment #11 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Author: mpolacek
Date: Sun Dec 29 16:44:41 2019
New Revision: 279755
URL: https://gcc.gnu.org/viewcvs?rev=279755&root=gcc&view=rev
Log:
PR c++/88337 - Implement P1327R1: Allow dynamic_cast in constexpr.
This patch implements
<http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1327r1.html>.
When build_dynamic_cast realizes that a dynamic_cast needs a run-time check, it
generates a call to __dynamic_cast -- see dyncast.cc in libsupc++ for its
definition. The gist of my approach is to evaluate such a call at compile
time.
* constexpr.c (cxx_dynamic_cast_fn_p): New function.
(extract_obj_from_addr_offset): New function.
(get_component_with_type): New function.
(cxx_eval_dynamic_cast_fn): New function.
(cxx_eval_call_expression): Call cxx_eval_dynamic_cast_fn for a call
to __dynamic_cast.
(potential_constant_expression_1): Don't give up on
cxx_dynamic_cast_fn_p.
* rtti.c (build_dynamic_cast_1): When creating a call to
__dynamic_cast, use the location of the original expression.
* g++.dg/cpp2a/constexpr-dynamic1.C: New test.
* g++.dg/cpp2a/constexpr-dynamic10.C: New test.
* g++.dg/cpp2a/constexpr-dynamic11.C: New test.
* g++.dg/cpp2a/constexpr-dynamic12.C: New test.
* g++.dg/cpp2a/constexpr-dynamic13.C: New test.
* g++.dg/cpp2a/constexpr-dynamic14.C: New test.
* g++.dg/cpp2a/constexpr-dynamic15.C: New test.
* g++.dg/cpp2a/constexpr-dynamic16.C: New test.
* g++.dg/cpp2a/constexpr-dynamic17.C: New test.
* g++.dg/cpp2a/constexpr-dynamic2.C: New test.
* g++.dg/cpp2a/constexpr-dynamic3.C: New test.
* g++.dg/cpp2a/constexpr-dynamic4.C: New test.
* g++.dg/cpp2a/constexpr-dynamic5.C: New test.
* g++.dg/cpp2a/constexpr-dynamic6.C: New test.
* g++.dg/cpp2a/constexpr-dynamic7.C: New test.
* g++.dg/cpp2a/constexpr-dynamic8.C: New test.
* g++.dg/cpp2a/constexpr-dynamic9.C: New test.
Added:
trunk/gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic1.C
trunk/gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic10.C
trunk/gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic11.C
trunk/gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic12.C
trunk/gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic13.C
trunk/gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic14.C
trunk/gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic15.C
trunk/gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic16.C
trunk/gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic17.C
trunk/gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic2.C
trunk/gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic3.C
trunk/gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic4.C
trunk/gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic5.C
trunk/gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic6.C
trunk/gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic7.C
trunk/gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic8.C
trunk/gcc/testsuite/g++.dg/cpp2a/constexpr-dynamic9.C
Modified:
trunk/gcc/cp/ChangeLog
trunk/gcc/cp/constexpr.c
trunk/gcc/cp/rtti.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug c++/88337] Implement P1002R1, P1327R1, P1330R0, C++20 relaxations of constexpr restrictions.
Date: Sun, 29 Dec 2019 16:47:00 -0000
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Marek Polacek <mpolacek at gcc dot gnu.org> changed:
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----------------------------------------------------------------------------
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Resolution|--- |FIXED
--- Comment #12 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Implemented in GCC 10.
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Subject: [Bug c++/88323] implement C++20 language features.
Date: Sun, 29 Dec 2019 16:48:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88323
Bug 88323 depends on bug 88337, which changed state.
Bug 88337 Summary: Implement P1002R1, P1327R1, P1330R0, C++20 relaxations of constexpr restrictions.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88337
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
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Subject: [Bug c++/55004] [meta-bug] constexpr issues
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Bug 55004 depends on bug 88337, which changed state.
Bug 88337 Summary: Implement P1002R1, P1327R1, P1330R0, C++20 relaxations of constexpr restrictions.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88337
What |Removed |Added
----------------------------------------------------------------------------
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>From gcc-bugs-return-664156-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 16:49:49 2019
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Subject: [Bug c++/93096] New: detect [class.cdtor]/6 UB in constexpr dynamic_cast
Date: Sun, 29 Dec 2019 16:49:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93096
Bug ID: 93096
Summary: detect [class.cdtor]/6 UB in constexpr dynamic_cast
Product: gcc
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We should detect the UB here:
struct V {
virtual void f();
};
struct A : V { };
struct B : V {
constexpr B(V*, A*);
};
struct D : A, B {
constexpr D() : B((A*)this, this) { }
};
constexpr B::B(V* v, A* a)
{
// undefined behavior, a has type A*, A not a base of B
dynamic_cast<B*>(a);
}
constexpr D d;
but currently we don't. This is
<http://eel.is/c++draft/class.cdtor#6.sentence-3>. See
<https://gcc.gnu.org/ml/gcc-patches/2019-12/msg01521.html> for another testcase
and possible approaches how to handle this.
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Subject: [Bug libgomp/93066] libgomp/target.c:525:46: error: expected expression before ')' token
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--- Comment #4 from John David Anglin <danglin at gcc dot gnu.org> ---
Created attachment 47562
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47562&action=edit
Patch
I'm fine with the proposed changes to target.c but I think we need the include
fix as it's needed for other packages:
https://community.hpe.com/t5/Languages-and-Scripting/SIZE-MAX-undefined/td-p/4798688#
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Subject: [Bug tree-optimization/61502] == comparison on "one-past" pointer gives wrong result
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--- Comment #35 from Alexander Cherepanov <ch3root at openwall dot com> ---
What remains in this pr is the original problem.
1. The best way to demonstrate that there is indeed a bug here is probably to
compare representation of pointers directly:
----------------------------------------------------------------------
#include <string.h>
#include <stdio.h>
__attribute__((noipa)) // imagine it in a separate TU
static void *opaque(void *p) { return p; }
int main()
{
int x[5];
int y[2];
void *p = &x;
void *q = &y + 1;
printf("val1: %d\n", p == q);
printf("repr: %d\n", memcmp(&p, &q, sizeof(void *)) == 0);
opaque(&p); // move the next comparison to runtime
printf("val2: %d\n", p == q);
opaque(q);
}
----------------------------------------------------------------------
$ gcc -std=c11 -pedantic -Wall -Wextra -O3 test.c && ./a.out
val1: 0
repr: 1
val2: 1
----------------------------------------------------------------------
gcc x86-64 version: gcc (GCC) 10.0.0 20191229 (experimental)
----------------------------------------------------------------------
C11, 6.2.6.1p4: "Two values (other than NaNs) with the same object
representation compare equal". Our pointers are not NaNs and have the same
representation so should compare equal.
DR 260 allows one to argue that representation of these pointers could change
right between the checks but IMHO this part of DR 260 is just wrong as it makes
copying objects byte-by-byte impossible. See
https://bugs.llvm.org/show_bug.cgi?id=44188 for a nice illustration.
While at it, the testcase also demonstrates that the comparison `p == q` is
unstable.
I'm not taking sides here, just stating that the standard and the compiler
disagree.
2. C++ at some point made results of the discussed comparison unspecified --
https://eel.is/c++draft/expr.eq#3.1 . According to the DR linked to in comment
27, it's done to make the definition usable at compile time. Perhaps
harmonization of the standards should move in this direction, not vice versa.
3. OTOH clang was fixed to be complying with C11.
4. What seems missing in the discussion is a clear description of benefits of
the current gcc's approach. Does it make some optimizations easier to
implement? Does it enable other optimizations?
Obviously, it could be used to fold `a + i == b` to `0` if `a` and `b` are two
different known arrays and `i` is unknown (or known to be exactly the length of
`a`). But this is probably not helpful for aliasing analysis as AA doesn't deal
with past-the-end pointers. And optimization of loops like in comment 19 is
probably not superhelpful too:-)
>From gcc-bugs-return-664159-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 17:47:36 2019
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Subject: [Bug libgomp/93097] New: Wrong OpenMP version reported
Date: Sun, 29 Dec 2019 17:47:00 -0000
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Bug ID: 93097
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Product: gcc
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Currently, version 201511 is reported in _OPENMP, which is OpenMP 4.5. The
actual version of OpenMP is 5, so version 201811 should be reported instead.
Offending line in libgomp/env.c is 1170:
- fputs (" _OPENMP = '201511'\n", stderr);
+ fputs (" _OPENMP = '201811'\n", stderr);
>From gcc-bugs-return-664161-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 17:51:34 2019
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Can't reproduce and don't see anything problematic on that code.
Unless e.g. the system headers are defining throws as a macro, can you e.g.
attach preprocessed gimple-fold.ii? (E.g. do cd gcc; make gimple-fold.o
and cut'n'paste the command line, replace -c with -E -dD)?
>From gcc-bugs-return-664160-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 17:51:01 2019
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Subject: [Bug libstdc++/68350] std::uninitialized_copy overly restrictive for trivially_copyable types
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Arthur O'Dwyer <arthur.j.odwyer at gmail dot com> changed:
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--- Comment #6 from Arthur O'Dwyer <arthur.j.odwyer at gmail dot com> ---
(I got here from
https://stackoverflow.com/questions/47464819/uninitialized-copy-memcpy-memmove-optimization)
Jonathan, you wrote:
> The point of the condition is to decide whether to use std::copy, because for trivially-copyable types that is optimized to memmove. But unlike std::uninitialized_copy, std::copy calls no constructors, so the type must be trivially default constructible, and if an exception is thrown, it calls no destructors, so the type must be trivially destructible as well. So we can only use the memmove optimization for types which [...]
What do you mean "if an exception is thrown"? If we call std::copy from here,
then it's because we are taking the memmove path. memmove never throws
exceptions, so how can we be worried about what happens "if an exception is
thrown"?
That is, the following code 100% definitely never attempts to destroy a `B`
object, so why does it matter that `B`'s destructor is non-trivial?
// https://godbolt.org/z/w7nTe5
struct A {
int i;
A() = default;
A(const A&) = default;
~A() = default;
};
struct B {
int i;
B() = default;
B(const B&) = default;
~B() {}
};
void copyAs(A *p, A *q, int n) {
std::uninitialized_copy(p, p+n, q); // successfully uses memmove
}
void copyBs(B *p, B *q, int n) {
std::uninitialized_copy(p, p+n, q); // fails to use memmove
}
>From gcc-bugs-return-664162-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 17:56:04 2019
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Subject: [Bug target/93094] [10 Regression] ICE in maybe_gen_insn, at optabs.c:7433
Date: Sun, 29 Dec 2019 17:56:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Started with r272239.
>From gcc-bugs-return-664163-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 18:01:50 2019
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Subject: [Bug libstdc++/93059] char and char8_t does not talk with each other with memcpy. std::copy std::copy_n, std::fill, std::fill_n, std::uninitialized_copy std::uninitialized_copy_n, std::fill, std::uninitialized_fill_n fails to convert to memxxx functions
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Bernd Edlinger <bernd.edlinger at hotmail dot de> changed:
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--- Comment #26 from Bernd Edlinger <bernd.edlinger at hotmail dot de> ---
(In reply to fdlbxtqi from comment #2)
> Also find a bug of __memmove
>
> /*
> * A constexpr wrapper for __builtin_memmove.
> * @param __num The number of elements of type _Tp (not bytes).
> */
> template<bool _IsMove, typename _Tp>
> _GLIBCXX14_CONSTEXPR
> inline void*
> __memmove(_Tp* __dst, const _Tp* __src, size_t __num)
> {
> #ifdef __cpp_lib_is_constant_evaluated
> if (std::is_constant_evaluated())
> {
> for(; __num > 0; --__num)
> {
> if constexpr (_IsMove)
> *__dst = std::move(*__src);
> else
> *__dst = *__src;
> ++__src;
> ++__dst;
> }
> return __dst;
> }
> else
> #endif
> return __builtin_memmove(__dst, __src, sizeof(_Tp) * __num);
> return __dst;
> }
>
> The last 2nd line return __dst is wrong. It should not exist.
Sorry, I don't know what this function is all about.
But to me the code in the ifdef looks totally bogus.
First it returns __dst+__num, while memmove is sopposed
to return __dst, and is is somehow clear that
__dst and __src do not overlap?
because if they do the loop would overwite the __dst buffer before
__src is fully copied?
>From gcc-bugs-return-664164-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 18:06:29 2019
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Subject: [Bug target/93094] [10 Regression] ICE in maybe_gen_insn, at optabs.c:7433
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--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Scalar MASK_STORE really shouldn't appear in the IL except in the copy of the
loop intended for vectorization only (when it is transformed into vectorized
MASK_STORE). So I'm afraid the above change leaks the loop intended for
vectorization only into the IL somehow.
>From gcc-bugs-return-664166-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 19:39:47 2019
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Subject: [Bug tree-optimization/93098] [10 Regression] ICE with negative shifter
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/93098] New: [10 Regression] ICE with negative shifter
Date: Sun, 29 Dec 2019 19:39:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93098
Bug ID: 93098
Summary: [10 Regression] ICE with negative shifter
Product: gcc
Version: 10.0
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Even though it is undefined code, we should not ICE on this code.
Try with -O2:
typedef unsigned long long uint64_t;
int popcount64c_1 (uint64_t x)
{
x -= (x >> -1) & 0x5555555555555555ULL;
x = (x & 0x3333333333333333ULL) + ((x >> 2) & 0x3333333333333333ULL);
x = (x + (x >> 4)) & 0x0f0f0f0f0f0f0f0fULL;
return (x * 0x0101010101010101ULL) >> 56;
}
Found this via inspection of match.pd after I was working on something else and
had the testcase for PR 50193 fails.
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Subject: [Bug tree-optimization/93098] [10 Regression] ICE with negative shifter
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--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This was introduced with r276721 .
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Subject: [Bug tree-optimization/93055] accumulation loops in stepanov_vector benchmark use more instruction level parpallelism
Date: Sun, 29 Dec 2019 21:24:00 -0000
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--- Comment #5 from Jan Hubicka <hubicka at gcc dot gnu.org> ---
Created attachment 47563
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47563&action=edit
fixed testcase
I have verified that building with
g++ -O3 -march=bdver1 -fno-prefetch-loop-arrays ~/stepanov_vector.ii
gets me the lea into internal loop. This does not happen with gcc9.
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Subject: [Bug c++/92745] [8/9 Regression] Initializing array with vec4 results in compile error
Date: Sun, 29 Dec 2019 23:48:00 -0000
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--- Comment #9 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Author: jakub
Date: Sun Dec 29 23:47:55 2019
New Revision: 279758
URL: https://gcc.gnu.org/viewcvs?rev=279758&root=gcc&view=rev
Log:
PR c++/92745
* g++.dg/cpp0x/initlist118.C: Add -Wno-psabi -w to dg-options.
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/g++.dg/cpp0x/initlist118.C
>From gcc-bugs-return-664170-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Sun Dec 29 23:53:48 2019
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Subject: [Bug libgomp/93097] Wrong OpenMP version reported
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--- Comment #1 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
That would be incorrect, as OpenMP 5 is only partially supported, there are
various OpenMP 5 features missing, some of them on the compiler side only, but
others (e.g. the allocators) on the library side too.
We can only claim OpenMP 5 support when everything is supported (hopefully in
GCC 11).
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Subject: [Bug c++/67834] Local references inside comdat groups
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--- Comment #10 from John David Anglin <danglin at gcc dot gnu.org> ---
Created attachment 47564
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Patch
Untested fix.
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--- Comment #2 from fdlbxtqi <euloanty at live dot com> ---
(In reply to Jakub Jelinek from comment #1)
> Can't reproduce and don't see anything problematic on that code.
> Unless e.g. the system headers are defining throws as a macro, can you e.g.
> attach preprocessed gimple-fold.ii? (E.g. do cd gcc; make gimple-fold.o
> and cut'n'paste the command line, replace -c with -E -dD)?
probably because I am working on a new Herbception's compiler?
BTW, throws should not be an identifier since Herb Sutter is going to use this
as his deterministic exception.
http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p0709r0.pdf
I am starting his herbception project.
https://github.com/expnkx/gcc/commit/41109f8f8c8f257e4b0ef691b27b1bcfe3d6d3ab
Can you give me some guidelines about how to start a new C++ branch???
Herbception is a huge change
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To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/93059] char and char8_t does not talk with each other with memcpy. std::copy std::copy_n, std::fill, std::fill_n, std::uninitialized_copy std::uninitialized_copy_n, std::fill, std::uninitialized_fill_n fails to convert to memxxx functions
Date: Mon, 30 Dec 2019 02:14:00 -0000
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--- Comment #27 from fdlbxtqi <euloanty at live dot com> ---
(In reply to Bernd Edlinger from comment #26)
> (In reply to fdlbxtqi from comment #2)
> > Also find a bug of __memmove
> >
> > /*
> > * A constexpr wrapper for __builtin_memmove.
> > * @param __num The number of elements of type _Tp (not bytes).
> > */
> > template<bool _IsMove, typename _Tp>
> > _GLIBCXX14_CONSTEXPR
> > inline void*
> > __memmove(_Tp* __dst, const _Tp* __src, size_t __num)
> > {
> > #ifdef __cpp_lib_is_constant_evaluated
> > if (std::is_constant_evaluated())
> > {
> > for(; __num > 0; --__num)
> > {
> > if constexpr (_IsMove)
> > *__dst = std::move(*__src);
> > else
> > *__dst = *__src;
> > ++__src;
> > ++__dst;
> > }
> > return __dst;
> > }
> > else
> > #endif
> > return __builtin_memmove(__dst, __src, sizeof(_Tp) * __num);
> > return __dst;
> > }
> >
> > The last 2nd line return __dst is wrong. It should not exist.
>
> Sorry, I don't know what this function is all about.
> But to me the code in the ifdef looks totally bogus.
> First it returns __dst+__num, while memmove is sopposed
> to return __dst, and is is somehow clear that
> __dst and __src do not overlap?
>
> because if they do the loop would overwite the __dst buffer before
> __src is fully copied?
Nope. It is C++20's new feature if(std::is_constant_evaluated()) which allows
you to write functions can be used both in compile and runtime.
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Subject: =?UTF-8?B?W0J1ZyBjKysvOTMwOTVdIEJ1aWxkIExhdGVzdCBHQ0MgZmFpbCAuLi8uLi9n?= =?UTF-8?B?Y2MvZ2NjL2dpbXBsZS1mb2xkLmM6NDE0Njo4OiBlcnJvcjogZXhwZWN0ZWQg?= =?UTF-8?B?dW5xdWFsaWZpZWQtaWQgYmVmb3JlIOKAmHRocm93c+KAmQ==?Date: Mon, 30 Dec 2019 02:21:00 -0000
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--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to fdlbxtqi from comment #2)
> (In reply to Jakub Jelinek from comment #1)
> > Can't reproduce and don't see anything problematic on that code.
> > Unless e.g. the system headers are defining throws as a macro, can you e.g.
> > attach preprocessed gimple-fold.ii? (E.g. do cd gcc; make gimple-fold.o
> > and cut'n'paste the command line, replace -c with -E -dD)?
>
> probably because I am working on a new Herbception's compiler?
oh. So if that is the case, then you need to have a list of reserved
identifiers and start changing them. But that change should go in at the
begining of stage 1.
> ...
> Can you give me some guidelines about how to start a new C++ branch???
> Herbception is a huge change
There are four ways:
1) have a svn branch (https://gcc.gnu.org/svn.html)
2) have a git only branch (https://gcc.gnu.org/wiki/GitMirror )
3) wait for the svn moved over to git and make a git branch.
4) have a local git branch which can be rebased on the new git after the move
has happened.
>From gcc-bugs-return-664175-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 30 03:26:15 2019
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From: "fxue at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/93084] [10 regression] Infinite loop in ipa-cp when building clang with LTO+PGO
Date: Mon, 30 Dec 2019 03:26:00 -0000
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fxue at gcc dot gnu.org changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |fxue at gcc dot gnu.org
--- Comment #5 from fxue at gcc dot gnu.org ---
I guess some situation is missed in self_recursively_generated_p(), this causes
propagation along scc explode.
>From gcc-bugs-return-664176-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 30 03:34:47 2019
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From: "fxue at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/93084] [10 regression] Infinite loop in ipa-cp when building clang with LTO+PGO
Date: Mon, 30 Dec 2019 03:34:00 -0000
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--- Comment #6 from fxue at gcc dot gnu.org ---
Could you share how you build clang with PGO, and train workload?
>From gcc-bugs-return-664177-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 30 06:32:17 2019
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From: "mcccs at gmx dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/93082] macOS Authorization.h needs fixinclude
Date: Mon, 30 Dec 2019 06:32:00 -0000
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--- Comment #2 from mcccs at gmx dot com ---
Reported on the "other side" https://bugs.llvm.org/show_bug.cgi?id=44406
Changing it to enum works too, my only doubt is that it has a different width
and sign (but better than not compiling)
Updated patch, thank you Andrew:
fix = {
hackname = darwin_authorization;
mach = "*-*-darwin*";
files = Frameworks/Security.framework/Headers/Authorization.h;
select =
"static const size_t kAuthorizationExternalFormLength = 32;\n";
c_fix = format;
c_fix_arg =
"enum { kAuthorizationExternalFormLength = 32 };\n";
test_text =
"static const size_t kAuthorizationExternalFormLength = 32;\n";
};
>From gcc-bugs-return-664178-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 30 07:51:14 2019
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Subject: [Bug tree-optimization/61502] == comparison on "one-past" pointer gives wrong result
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--- Comment #36 from rguenther at suse dot de <rguenther at suse dot de> ---
On December 29, 2019 6:42:55 PM GMT+01:00, ch3root at openwall dot com
<gcc-bugzilla@gcc.gnu.org> wrote:
>https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61502
>
>--- Comment #35 from Alexander Cherepanov <ch3root at openwall dot com>
>---
>What remains in this pr is the original problem.
>
>1. The best way to demonstrate that there is indeed a bug here is
>probably to
>compare representation of pointers directly:
>
>----------------------------------------------------------------------
>#include <string.h>
>#include <stdio.h>
>
>__attribute__((noipa)) // imagine it in a separate TU
>static void *opaque(void *p) { return p; }
>
>int main()
>{
> int x[5];
> int y[2];
>
> void *p = &x;
> void *q = &y + 1;
>
> printf("val1: %d\n", p == q);
> printf("repr: %d\n", memcmp(&p, &q, sizeof(void *)) == 0);
>
> opaque(&p); // move the next comparison to runtime
> printf("val2: %d\n", p == q);
>
> opaque(q);
>}
>----------------------------------------------------------------------
>$ gcc -std=c11 -pedantic -Wall -Wextra -O3 test.c && ./a.out
>val1: 0
>repr: 1
>val2: 1
>----------------------------------------------------------------------
>gcc x86-64 version: gcc (GCC) 10.0.0 20191229 (experimental)
>----------------------------------------------------------------------
>
>C11, 6.2.6.1p4: "Two values (other than NaNs) with the same object
>representation compare equal". Our pointers are not NaNs and have the
>same
>representation so should compare equal.
>
>DR 260 allows one to argue that representation of these pointers could
>change
>right between the checks but IMHO this part of DR 260 is just wrong as
>it makes
>copying objects byte-by-byte impossible. See
>https://bugs.llvm.org/show_bug.cgi?id=44188 for a nice illustration.
>
>While at it, the testcase also demonstrates that the comparison `p ==
>q` is
>unstable.
>
>I'm not taking sides here, just stating that the standard and the
>compiler
>disagree.
>
>2. C++ at some point made results of the discussed comparison
>unspecified --
>https://eel.is/c++draft/expr.eq#3.1 . According to the DR linked to in
>comment
>27, it's done to make the definition usable at compile time. Perhaps
>harmonization of the standards should move in this direction, not vice
>versa.
>
>3. OTOH clang was fixed to be complying with C11.
>
>4. What seems missing in the discussion is a clear description of
>benefits of
>the current gcc's approach. Does it make some optimizations easier to
>implement? Does it enable other optimizations?
>Obviously, it could be used to fold `a + i == b` to `0` if `a` and `b`
>are two
>different known arrays and `i` is unknown
That's indeed the main thing. Basically it allows points-to analysis work at
all in the presence of non-constant offsets.
(or known to be exactly the
>length of
>`a`). But this is probably not helpful for aliasing analysis as AA
>doesn't deal
>with past-the-end pointers. And optimization of loops like in comment
>19 is
>probably not superhelpful too:-)
>From gcc-bugs-return-664179-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 30 08:06:16 2019
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From: "build+gcc@de-korte.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug libgomp/93097] Wrong OpenMP version reported
Date: Mon, 30 Dec 2019 08:06:00 -0000
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Arjen de Korte <build+gcc@de-korte.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |INVALID
--- Comment #2 from Arjen de Korte <build+gcc@de-korte.org> ---
I see. I took the availability of a single OpenMP 5 function as an indication
of full support. I was wrong. Apologies for the noise.
>From gcc-bugs-return-664180-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 30 09:21:08 2019
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From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/93098] [10 Regression] ICE with negative shifter
Date: Mon, 30 Dec 2019 09:21:00 -0000
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Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2019-12-30
Assignee|unassigned at gcc dot gnu.org |jakub at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 47565
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47565&action=edit
gcc10-pr93098.patch
Untested fix.
>From gcc-bugs-return-664181-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 30 10:01:49 2019
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From: "rainer@emrich-ebersheim.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libobjc/93099] New: Multiple definition error while linking libobjc.dll.a
Date: Mon, 30 Dec 2019 10:01:00 -0000
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Bug ID: 93099
Summary: Multiple definition error while linking libobjc.dll.a
Product: gcc
Version: unknown
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Target Milestone: ---
libtool: link:
/opt/devel/SCRATCH/tmp.F6n0FMZOiy/gcc-10.0.0/gcc-10.0.0/./gcc/xgcc
-B/opt/devel/SCRATCH/tmp.F6n0FMZOiy/gcc-10.0.0/gcc-10.0.0/./gcc/
-L/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-10.0.0/x86_64-w64-mingw32/lib
-L/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-10.0.0/mingw/lib
-isystem
/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-10.0.0/x86_64-w64-mingw32/include
-isystem
/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-10.0.0/mingw/include
-B/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-10.0.0/x86_64-w64-mingw32/bin/
-B/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-10.0.0/x86_64-w64-mingw32/lib/
-isystem
/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-10.0.0/x86_64-w64-mingw32/include
-isystem
/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-10.0.0/x86_64-w64-mingw32/sys-include
-shared .libs/NXConstStr.o .libs/Object.o .libs/Protocol.o
.libs/accessors.o .libs/linking.o .libs/class.o .libs/encoding.o .libs/error.o
.libs/gc.o .libs/hash.o .libs/init.o .libs/ivars.o .libs/memory.o
.libs/methods.o .libs/nil_method.o .libs/objc-foreach.o .libs/objc-sync.o
.libs/objects.o .libs/protocols.o .libs/sarray.o .libs/selector.o
.libs/sendmsg.o .libs/thr.o .libs/exception.o
-L/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-10.0.0/x86_64-w64-mingw32/lib
-L/opt/devel/gnu/gcc/MINGW_NT/x86_64-w64-mingw32/mingw-w64-runtime-trunk-svn/gcc-10.0.0/mingw/lib
-shared-libgcc -o .libs/libobjc-4.dll -Wl,--enable-auto-image-base -Xlinker
--out-implib -Xlinker .libs/libobjc.dll.a
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/Protocol.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
multiple definition of `_objc_load_callback';
.libs/Object.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/class.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
multiple definition of `_objc_load_callback';
.libs/Object.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/encoding.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
multiple definition of `_objc_load_callback';
.libs/Object.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/hash.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
multiple definition of `_objc_load_callback';
.libs/Object.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/init.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
multiple definition of `_objc_load_callback';
.libs/Object.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/ivars.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
multiple definition of `_objc_load_callback';
.libs/Object.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/memory.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
multiple definition of `_objc_load_callback';
.libs/Object.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/methods.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
multiple definition of `_objc_load_callback';
.libs/Object.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/objc-foreach.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
multiple definition of `_objc_load_callback';
.libs/Object.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/objc-sync.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
multiple definition of `_objc_load_callback';
.libs/Object.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/objects.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
multiple definition of `_objc_load_callback';
.libs/Object.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/protocols.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
multiple definition of `_objc_load_callback';
.libs/Object.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/sarray.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
multiple definition of `_objc_load_callback';
.libs/Object.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/selector.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
multiple definition of `_objc_load_callback';
.libs/Object.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/sendmsg.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
multiple definition of `_objc_load_callback';
.libs/Object.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/thr.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
multiple definition of `_objc_load_callback';
.libs/Object.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/thr.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/message.h:113:
multiple definition of `__objc_msg_forward2';
.libs/sendmsg.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/message.h:113:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/thr.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/message.h:112:
multiple definition of `__objc_msg_forward';
.libs/sendmsg.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/message.h:112:
first defined here
D:\opt\devel\gnu\gcc\MINGW_NT\x86_64-w64-mingw32\mingw-w64-runtime-trunk-svn\gcc-10.0.0\bin\ld.exe:
.libs/exception.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
multiple definition of `_objc_load_callback';
.libs/Object.o:D:/opt/devel/gnu/src/gcc-mingw-w64/gcc-10.0.0/libobjc/objc/runtime.h:919:
first defined here
collect2.exe: error: ld returned 1 exit status
make[2]: *** [Makefile:265: libobjc.la] Error 1
make[2]: Leaving directory
'/opt/devel/SCRATCH/tmp.F6n0FMZOiy/gcc-10.0.0/gcc-10.0.0/x86_64-w64-mingw32/libobjc'
make[1]: *** [Makefile:21010: all-target-libobjc] Error 2
make[1]: Leaving directory
'/opt/devel/SCRATCH/tmp.F6n0FMZOiy/gcc-10.0.0/gcc-10.0.0'
make: *** [Makefile:1009: all] Error 2
>From gcc-bugs-return-664182-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 30 10:04:47 2019
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From: "rainer@emrich-ebersheim.de" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libobjc/93099] Multiple definition error while linking libobjc.dll.a
Date: Mon, 30 Dec 2019 10:04:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93099
--- Comment #1 from Rainer Emrich <rainer@emrich-ebersheim.de> ---
That's with revision 279747.
>From gcc-bugs-return-664183-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 30 10:27:52 2019
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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libobjc/93099] Multiple definition error while linking libobjc.dll.a
Date: Mon, 30 Dec 2019 10:27:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93099
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |ASSIGNED
Last reconfirmed| |2019-12-30
Assignee|unassigned at gcc dot gnu.org |pinskia at gcc dot gnu.org
Ever confirmed|0 |1
--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Created attachment 47566
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=47566&action=edit
Patch to try
Can you try this patch?
It should fix the problem but I cannot test it as I don't have a windows build
machine setup.
>From gcc-bugs-return-664184-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 30 10:28:11 2019
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Subject: [Bug libobjc/93099] [10 Regression] Multiple definition error while linking libobjc.dll.a
Date: Mon, 30 Dec 2019 10:28:00 -0000
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Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Keywords| |build
Target Milestone|--- |10.0
Summary|Multiple definition error |[10 Regression] Multiple
|while linking libobjc.dll.a |definition error while
| |linking libobjc.dll.a
>From gcc-bugs-return-664185-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 30 10:31:47 2019
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Subject: [Bug middle-end/93100] New: gcc -fsanitizedress inhibits -Wuninitialized
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93100
Bug ID: 93100
Summary: gcc -fsanitize=address inhibits -Wuninitialized
Product: gcc
Version: 9.2.1
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Similar to -fsanitize=undefined in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89284, -fsanitize=address also
inhibits -Wuninitialized.
$ cat prog.cc
struct A
{
bool a;
int i;
};
void f (void)
{
struct A a;
if (a.i) { // expecting -Wuninitialized wearning
struct A b = a;
}
}
void g (void)
{
struct A a;
if (a.a) { // expecting -Wuninitialized wearning
struct A b = a;
}
}
$ gcc -O0 -S -Wuninitialized -Wno-unused prog.cc --sanitize=address
<no output>
$ gcc -O0 -S -Wuninitialized -Wno-unused prog.cc
prog.cc: In function ‘void f()’:
prog.cc:11:9: warning: ‘a.A::i’ is used uninitialized in this function
[-Wuninitialized]
11 | if (a.i) { // expecting -Wuninitialized wearning
| ~~^
prog.cc:12:14: warning: ‘a’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
12 | struct A b = a;
| ^
prog.cc: In function ‘void g()’:
prog.cc:20:9: warning: ‘a.A::a’ is used uninitialized in this function
[-Wuninitialized]
20 | if (a.a) { // expecting -Wuninitialized wearning
| ~~^
prog.cc:21:14: warning: ‘a’ may be used uninitialized in this function
[-Wmaybe-uninitialized]
21 | struct A b = a;
| ^
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Subject: [Bug fortran/92961] [8/9/10 Regression] ICE in gfc_zero_size_array, at fortran/arith.c:1680
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92961
--- Comment #2 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Mon Dec 30 10:34:11 2019
New Revision: 279762
URL: https://gcc.gnu.org/viewcvs?rev=279762&root=gcc&view=rev
Log:
Catch division by zero errors in array sizes.
2019-12-30 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/92961
* gfortran.h (gfc_seen_div0): Add declaration.
* arith.h (gfc_seen_div0): Add definition.
(eval_intrinsic): For integer division by zero, set gfc_seen_div0.
* decl.c (variable_decl): If resolution resp. simplification
fails for array spec and a division of zero error has been
seen, return MATCH_ERROR.
2019-12-30 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/92961
* gfortran.dg/arith_divide_2.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/arith_divide_2.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/arith.c
trunk/gcc/fortran/decl.c
trunk/gcc/fortran/gfortran.h
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug libstdc++/91541] [C++17] Exception specification of operator= of node-based containers may be broken
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--- Comment #11 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Mon Dec 30 10:43:38 2019
New Revision: 279763
URL: https://gcc.gnu.org/viewcvs?rev=279763&root=gcc&view=rev
Log:
Remove KIND argument from INDEX so it does not mess up scalarization.
2019-12-30 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/91541
* intrinsic.c (add_sym_4ind): New function.
(add_functions): Use it for INDEX.
(resolve_intrinsic): Also call f1m for INDEX.
* intrinsic.h (gfc_resolve_index_func): Adjust prototype to
take a gfc_arglist instead of individual arguments.
* iresolve.c (gfc_resolve_index_func): Adjust arguments.
Remove KIND argument if present, and make sure this is
not done twice.
* trans-decl.c: Include "intrinsic.h".
(gfc_get_extern_function_decl): Special case for resolving INDEX.
2019-12-30 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/91541
* gfortran.dg/index_3.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/index_3.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/intrinsic.c
trunk/gcc/fortran/intrinsic.h
trunk/gcc/fortran/iresolve.c
trunk/gcc/fortran/trans-decl.c
trunk/gcc/testsuite/ChangeLog
>From gcc-bugs-return-664188-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 30 10:44:47 2019
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Subject: [Bug fortran/92961] [8/9 Regression] ICE in gfc_zero_size_array, at fortran/arith.c:1680
Date: Mon, 30 Dec 2019 10:44:00 -0000
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Version|10.0 |9.2.1
Summary|[8/9/10 Regression] ICE in |[8/9 Regression] ICE in
|gfc_zero_size_array, at |gfc_zero_size_array, at
|fortran/arith.c:1680 |fortran/arith.c:1680
--- Comment #3 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Fixed on trunk so far.
>From gcc-bugs-return-664190-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 30 10:46:56 2019
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Subject: [Bug c++/93101] New: [regression] ICE - aggregate initialization of base
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Bug ID: 93101
Summary: [regression] ICE - aggregate initialization of base
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Following code snippet compiles fine with gcc 9 and earlier, but ICEs on gcc
10.0.0 20191229 (verified on godbolt.org)
#include <string>
struct base
{
std::string bla;
};
struct foo : base
{
int a;
};
base makeBase();
int getInt();
foo create()
{
return foo{ makeBase(), getInt() };
}
>From gcc-bugs-return-664189-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 30 10:46:11 2019
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Subject: [Bug fortran/91651] [F03] Implement KIND argument for INDEX
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--- Comment #3 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Mon Dec 30 10:43:38 2019
New Revision: 279763
URL: https://gcc.gnu.org/viewcvs?rev=279763&root=gcc&view=rev
Log:
Remove KIND argument from INDEX so it does not mess up scalarization.
2019-12-30 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/91541
* intrinsic.c (add_sym_4ind): New function.
(add_functions): Use it for INDEX.
(resolve_intrinsic): Also call f1m for INDEX.
* intrinsic.h (gfc_resolve_index_func): Adjust prototype to
take a gfc_arglist instead of individual arguments.
* iresolve.c (gfc_resolve_index_func): Adjust arguments.
Remove KIND argument if present, and make sure this is
not done twice.
* trans-decl.c: Include "intrinsic.h".
(gfc_get_extern_function_decl): Special case for resolving INDEX.
2019-12-30 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/91541
* gfortran.dg/index_3.f90: New test.
Added:
trunk/gcc/testsuite/gfortran.dg/index_3.f90
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/fortran/intrinsic.c
trunk/gcc/fortran/intrinsic.h
trunk/gcc/fortran/iresolve.c
trunk/gcc/fortran/trans-decl.c
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug fortran/91651] [F03] Implement KIND argument for INDEX
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--- Comment #4 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Author: tkoenig
Date: Mon Dec 30 10:47:39 2019
New Revision: 279765
URL: https://gcc.gnu.org/viewcvs?rev=279765&root=gcc&view=rev
Log:
2019-12-30 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/91651
Fix PR numbers in ChangeLog.
Modified:
trunk/gcc/fortran/ChangeLog
trunk/gcc/testsuite/ChangeLog
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Subject: [Bug libstdc++/91541] [C++17] Exception specification of operator= of node-based containers may be broken
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Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |tkoenig at gcc dot gnu.org
--- Comment #12 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
(In reply to Thomas Koenig from comment #11)
*sigh* corrected in the original PR.
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Subject: [Bug fortran/91651] [F03] Implement KIND argument for INDEX
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91651
Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |FIXED
--- Comment #5 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
Fixed on trunk.
Thanks for the bug report!
>From gcc-bugs-return-664194-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org Mon Dec 30 11:01:29 2019
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Date: Mon, 30 Dec 2019 11:01:00 -0000
From: Jan Hubicka <hubicka@ucw.cz>
To: "fxue at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
Cc: gcc-bugs@gcc.gnu.org
Subject: Re: [Bug tree-optimization/93084] [10 regression] Infinite loop in ipa-cp when building clang with LTO+PGO
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> https://gcc.gnu.org/bugzilla/show_bug.cgi?id“084
>
> --- Comment #6 from fxue at gcc dot gnu.org ---
> Could you share how you build clang with PGO, and train workload?
It needs a lot of patience. If you have patch I can try it since I
still have the train data and corresponding gcc tree.
I do the following. Pretty much imitating what
utils/collect_and_build_with_pgo.py does.
First I build instrumented compiler and train it on testsuite (it takes
a long time and probably could be omitted)
cmake -G Ninja /aux/hubicka/llvm \
-DCLANG_TABLEGEN=/aux/hubicka/llvm/out/stage1/bin/clang-tblgen \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_CXX_COMPILER=/aux/hubicka/trunk-install/bin/g++ \
-DCMAKE_C_COMPILER=/aux/hubicka/trunk-install/bin/gcc \
-DCMAKE_INSTALL_PREFIX=/aux/hubicka/llvm10-install-gccfdolto \
-DLLVM_BINUTILS_INCDIR=/aux/hubicka/binutils-install/include/ \
-DLLVM_BUILD_RUNTIME=No \
-DLLVM_TABLEGEN=/aux/hubicka/llvm/out/stage1/bin/llvm-tblgen \
-DLLVM_TARGETS_TO_BUILD=X86 \
-DCMAKE_RANLIB=/aux/hubicka/trunk-install/bin/gcc-ranlib \
-DCMAKE_AR=/aux/hubicka/trunk-install/bin/gcc-ar \
-DCMAKE_C_FLAGS="-O2 -flto=auto -flifetime-dse=1 -fno-semantic-interposition -fprofile-generate" \
-DCMAKE_CXX_FLAGS="-O2 -flto=auto -flifetime-dse=1 -fno-semantic-interposition -fprofile-generate" \
-DLLVM_PARALLEL_LINK_JOBS=1
ninja clang lld
ninja check-llvm check-clang
next I do train build in new directory.
cmake -G Ninja /aux/hubicka/llvm \
-DCMAKE_BUILD_TYPE=Release \
-DCMAKE_CXX_COMPILER=/aux/hubicka/llvm/out/instrumented-gcc/bin/clang++ \
-DCMAKE_C_COMPILER=/aux/hubicka/llvm/out/instrumented-gcc/bin/clang
ninja all
then I tar gcda files collected in the first build directory
cd /aux/hubicka/llvm/instrumented-gcc/
tar czvf ../clang-profile.tgz `find . -name "*.gcda"`
and do final build supplying the gcda files.
tar xzvf ../clang-profile.tgz
cmake -G Ninja /aux/hubicka/llvm \
-DCLANG_TABLEGEN=/aux/hubicka/llvm/out/stage1/bin/clang-tblgen \
-DCMAKE_BUILD_TYPE=Release -DCMAKE_C_FLAGS=-Wno-backend-plugin \
-DLLVM_TABLEGEN=/aux/hubicka/llvm/out/stage1/bin/llvm-tblgen \
-DCMAKE_RANLIB=/aux/hubicka/trunk-install/bin/gcc-ranlib \
-DCMAKE_AR=/aux/hubicka/trunk-install/bin/gcc-ar \
-DCMAKE_C_FLAGS="-O2 -fno-semantic-interposition -fprofile-use -Wno-missing-profile -flto=auto -flifetime-dse=1 -fprofile-correction -Wno-error" \
-DCMAKE_CXX_FLAGS="-O2 -fno-semantic-interposition -fprofile-use -Wno-missing-profile -flifetime-dse=1 -flto=auto -fprofile-correction -Wno-error" \
-DLLVM_TARGETS_TO_BUILD=X86 \
-DCMAKE_CXX_COMPILER=/aux/hubicka/trunk-install/bin/g++ \
-DCMAKE_C_COMPILER=/aux/hubicka/trunk-install/bin/gcc \
-DLLVM_BINUTILS_INCDIR=/aux/hubicka/binutils-install/include/ \
-DLLVM_PARALLEL_LINK_JOBS=1
ninja all
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