On Wed, Aug 27, 2025 at 02:11:44AM +0000, Jiang, Haochen wrote:
> On Linux/x86_64,
>
> 001cd39749f94ece8276b63f91eb864babb81a5d is the first bad commit
> commit 001cd39749f94ece8276b63f91eb864babb81a5d
> Author: Andi Kleen <[email protected]>
> 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
Hmm it works for me and your configuration doesn't look that different.
I believe the test is a bit sensitive on the target tuning, but
you shouldn't use anything special here.
Can you send a few lines around it from the logs? Like
find -name gcc.log | xargs grep -C5 'FAIL.*gf2p8affine'
-Andi
>
> 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.)
>
