On Linux/x86_64,
001cd39749f94ece8276b63f91eb864babb81a5d is the first bad commit
commit 001cd39749f94ece8276b63f91eb864babb81a5d
Author: Andi Kleen <a...@gcc.gnu.org>
Date: Sun Aug 3 17:35:39 2025 -0700
Use x86 GFNI for vectorized constant byte shifts/rotates
caused
FAIL: gcc.target/i386/shift-gf2p8affine-5.c scan-assembler-times vgf2p8affineqb
31
FAIL: gcc.target/i386/shift-gf2p8affine-6.c scan-assembler-times vgf2p8affineqb 0
FAIL: gcc.target/i386/shift-gf2p8affine-7.c scan-assembler-times vgf2p8affineqb
53
with GCC configured with
../../gcc/configure
--prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-3364/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/shift-gf2p8affine-5.c
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="i386.exp=gcc.target/i386/shift-gf2p8affine-5.c
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="i386.exp=gcc.target/i386/shift-gf2p8affine-6.c
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="i386.exp=gcc.target/i386/shift-gf2p8affine-6.c
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="i386.exp=gcc.target/i386/shift-gf2p8affine-7.c
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check
RUNTESTFLAGS="i386.exp=gcc.target/i386/shift-gf2p8affine-7.c
--target_board='unix{-m64\ -march=cascadelake}'"
(Please directly reply to this email for question about this report.)
(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.)
