* [r14-6559 Regression] FAIL: gcc.dg/guality/pr58791-4.c -Os -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i == 486 on Linux/x86_64
@ 2023-12-15 1:23 haochen.jiang
2023-12-15 8:06 ` Richard Biener
0 siblings, 1 reply; 3+ messages in thread
From: haochen.jiang @ 2023-12-15 1:23 UTC (permalink / raw)
To: dizhao, gcc-regression, gcc-patches, haochen.jiang
On Linux/x86_64,
8afdbcdd7abe1e3c7a81e07f34c256e7f2dbc652 is the first bad commit
commit 8afdbcdd7abe1e3c7a81e07f34c256e7f2dbc652
Author: Di Zhao <dizhao@os.amperecomputing.com>
Date: Fri Dec 15 03:22:32 2023 +0800
Consider fully pipelined FMA in get_reassociation_width
caused
FAIL: gcc.dg/guality/pr58791-4.c -O2 -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i2 == 487
FAIL: gcc.dg/guality/pr58791-4.c -O2 -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i == 486
FAIL: gcc.dg/guality/pr58791-4.c -O2 -flto -fno-use-linker-plugin -flto-partition=none -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i2 == 487
FAIL: gcc.dg/guality/pr58791-4.c -O2 -flto -fno-use-linker-plugin -flto-partition=none -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i == 486
FAIL: gcc.dg/guality/pr58791-4.c -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i2 == 487
FAIL: gcc.dg/guality/pr58791-4.c -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i == 486
FAIL: gcc.dg/guality/pr58791-4.c -O3 -g -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i2 == 487
FAIL: gcc.dg/guality/pr58791-4.c -O3 -g -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i == 486
FAIL: gcc.dg/guality/pr58791-4.c -Os -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i2 == 487
FAIL: gcc.dg/guality/pr58791-4.c -Os -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i == 486
with GCC configured with
../../gcc/configure --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r14-6559/usr --enable-clocale=gnu --with-system-zlib --with-demangler-in-ld --with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet --without-isl --enable-libmpx x86_64-linux --disable-bootstrap
To reproduce:
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="guality.exp=gcc.dg/guality/pr58791-4.c --target_board='unix{-m64\ -march=cascadelake}'"
(Please do not reply to this email, for question about this report, contact me at haochen dot jiang at intel.com.)
(If you met problems with cascadelake related, disabling AVX512F in command line might save that.)
(However, please make sure that there is no potential problems with AVX512.)
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [r14-6559 Regression] FAIL: gcc.dg/guality/pr58791-4.c -Os -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i == 486 on Linux/x86_64
2023-12-15 1:23 [r14-6559 Regression] FAIL: gcc.dg/guality/pr58791-4.c -Os -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i == 486 on Linux/x86_64 haochen.jiang
@ 2023-12-15 8:06 ` Richard Biener
0 siblings, 0 replies; 3+ messages in thread
From: Richard Biener @ 2023-12-15 8:06 UTC (permalink / raw)
To: haochen.jiang; +Cc: dizhao, gcc-regression, gcc-patches, haochen.jiang
On Fri, Dec 15, 2023 at 2:25 AM haochen.jiang
<haochenj@ecsmtp.sh.intel.com> wrote:
>
> On Linux/x86_64,
>
> 8afdbcdd7abe1e3c7a81e07f34c256e7f2dbc652 is the first bad commit
> commit 8afdbcdd7abe1e3c7a81e07f34c256e7f2dbc652
> Author: Di Zhao <dizhao@os.amperecomputing.com>
> Date: Fri Dec 15 03:22:32 2023 +0800
>
> Consider fully pipelined FMA in get_reassociation_width
>
> caused
>
> FAIL: gcc.dg/guality/pr58791-4.c -O2 -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i2 == 487
> FAIL: gcc.dg/guality/pr58791-4.c -O2 -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i == 486
> FAIL: gcc.dg/guality/pr58791-4.c -O2 -flto -fno-use-linker-plugin -flto-partition=none -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i2 == 487
> FAIL: gcc.dg/guality/pr58791-4.c -O2 -flto -fno-use-linker-plugin -flto-partition=none -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i == 486
> FAIL: gcc.dg/guality/pr58791-4.c -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i2 == 487
> FAIL: gcc.dg/guality/pr58791-4.c -O2 -flto -fuse-linker-plugin -fno-fat-lto-objects -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i == 486
> FAIL: gcc.dg/guality/pr58791-4.c -O3 -g -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i2 == 487
> FAIL: gcc.dg/guality/pr58791-4.c -O3 -g -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i == 486
> FAIL: gcc.dg/guality/pr58791-4.c -Os -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i2 == 487
> FAIL: gcc.dg/guality/pr58791-4.c -Os -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i == 486
>
> with GCC configured with
>
> ../../gcc/configure --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r14-6559/usr --enable-clocale=gnu --with-system-zlib --with-demangler-in-ld --with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet --without-isl --enable-libmpx x86_64-linux --disable-bootstrap
>
> To reproduce:
>
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="guality.exp=gcc.dg/guality/pr58791-4.c --target_board='unix{-m64\ -march=cascadelake}'"
There's an extra intermediate stmt inserted (for much later use, but
reassoc inserts close to defs) that is
then also used for FMA forming. This disturbs things in some way:
g_5 = (double) f_4;
# DEBUG g => g_5
# DEBUG BEGIN_STMT
h_7 = (double) b_6(D);
# DEBUG h => h_7
# DEBUG BEGIN_STMT
_39 = h_7 * 3.25e+0;
# DEBUG D#5 => g_5 * h_7
# DEBUG i => D#5
# DEBUG BEGIN_STMT
# DEBUG i2 => D#5 + 1.0e+0
# DEBUG BEGIN_STMT
# DEBUG D#8 => g_5 * _39
_3 = .FMA (g_5, _39, h_7);
g_5 is dead after the FMA. Interestingly removing the
asm volatile (NOP : : : "memory");
asm volatile (NOP : : : "memory");
lines fixes the regression because then we can TER the FMA, keeping
g_5 live for longer.
Richard.
^ permalink raw reply [flat|nested] 3+ messages in thread
* [r14-6559 Regression] FAIL: gcc.dg/guality/pr58791-4.c -Os -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i == 486 on Linux/x86_64
@ 2023-12-15 17:36 haochen.jiang
0 siblings, 0 replies; 3+ messages in thread
From: haochen.jiang @ 2023-12-15 17:36 UTC (permalink / raw)
To: dizhao, gcc-regression, gcc-patches, haochen.jiang
On Linux/x86_64,
8afdbcdd7abe1e3c7a81e07f34c256e7f2dbc652 is the first bad commit
commit 8afdbcdd7abe1e3c7a81e07f34c256e7f2dbc652
Author: Di Zhao <dizhao@os.amperecomputing.com>
Date: Fri Dec 15 03:22:32 2023 +0800
Consider fully pipelined FMA in get_reassociation_width
caused
FAIL: gcc.dg/pr110279-2.c scan-tree-dump-not reassoc2 "was chosen for reassociation"
FAIL: gcc.dg/pr110279-2.c scan-tree-dump-times optimized "\\.FMA " 3
with GCC configured with
../../gcc/configure --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r14-6559/usr --enable-clocale=gnu --with-system-zlib --with-demangler-in-ld --with-fpmath=sse --enable-languages=c,c++,fortran --enable-cet --without-isl --enable-libmpx x86_64-linux --disable-bootstrap
To reproduce:
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/pr110279-2.c --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/pr110279-2.c --target_board='unix{-m64}'"
(Please do not reply to this email, for question about this report, contact me at haochen dot jiang at intel.com)
(If you met problems with cascadelake related, disabling AVX512F in command line might save that.)
(However, please make sure that there is no potential problems with AVX512.)
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2023-12-15 17:38 UTC | newest]
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2023-12-15 1:23 [r14-6559 Regression] FAIL: gcc.dg/guality/pr58791-4.c -Os -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i == 486 on Linux/x86_64 haochen.jiang
2023-12-15 8:06 ` Richard Biener
2023-12-15 17:36 haochen.jiang
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