x86_64 regression analysis

x86_64 regression analysis

[Sunil Pandey]

Hello,

We will start analyzing x86_64 regressions reported at

https://gcc.gnu.org/pipermail/gcc-regression/

to identify commits which caused each regression. For each regression, We
will send an email to the committer, gcc-regression and gcc-patches mailing
lists in following format.

From: sunil.k.pandey <skpandey@sc.intel.com>

Date: Tue, Aug 25, 2020 at 9:06 AMSubject: [r10-8599 Regression] FAIL:
gcc.target/i386/vectorize8.c (internal compiler error) on
Linux/x86_64To: author,  gcc-regression@gcc.gnu.org,
gcc-patches@gcc.gnu.org On
Linux/x86_64,f098bc87dcae5646d11a351cfb55d0e1124c7f60 is the first bad
commitcommit f098bc87dcae5646d11a351cfb55d0e1124c7f60Author:
authorDate:   Mon Jul 20 10:13:58 2020 +0800    Using UNSPEC for
vector compare to mask register.causedFAIL:
gcc.target/i386/vectorize8.c (internal compiler error)with GCC
configured with../../gcc/configure
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-10/releases/gcc-10/r10-8599/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-bootstrapTo
reproduce:$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="i386.exp=gcc.target/i386/vectorize8.c
--target_board='unix{-m64\ -march=cascadelake}'"(Please do not reply
to this email, for question about this report, contact me at skpgkp2
at gmail dot com)

x86_64 regression analysis

[Sunil Pandey]

Hello,

We will start analyzing x86_64 regressions reported at
https://gcc.gnu.org/pipermail/gcc-regression/

to identify commits which caused each regression. For each regression, We
will send an email to the committer, gcc-regression and gcc-patches mailing
lists in following format.


From: sunil.k.pandey <skpandey@sc.intel.com>
Date: Wed, Aug 26, 2020 at 11:06 PM
Subject: [r11-2683 Regression] FAIL: gcc.target/i386/avx512bw-pr96246-1.c
scan-assembler-times vblendmp[sd][\t ] 2 on Linux/x86_64
To: <author>, <gcc-regression@gcc.gnu.org>, <gcc-patches@gcc.gnu.org>


On Linux/x86_64,

7123217afb33d4a2860f552ad778a819cc8dea5e is the first bad commit
commit 7123217afb33d4a2860f552ad778a819cc8dea5e
Author: author <author>
Date:   Tue Jul 21 15:25:20 2020 +0800

    Merge two define_insn: <avx512>_blendm<mode>, <avx512>_load<mode>_mask.

caused

FAIL: gcc.target/i386/avx512bw-pr96246-1.c scan-assembler-times
vblendmp[sd][\t ] 2

with GCC configured with

../../gcc/configure
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r11-2683/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="i386.exp=gcc.target/i386/avx512bw-pr96246-1.c
--target_board='unix{-m64}'"

(Please do not reply to this email, for question about this report, contact
me at skpgkp2 at gmail dot com)