On Fri, Jul 7, 2023 at 3:18 PM Jan Beulich via Gcc-regression
<gcc-regress...@gcc.gnu.org> wrote:
>
> On 06.07.2023 13:57, haochen.jiang wrote:
> > On Linux/x86_64,
> >
> > e007369c8b67bcabd57c4fed8cff2a6db82e78e6 is the first bad commit
> > commit e007369c8b67bcabd57c4fed8cff2a6db82e78e6
> > Author: Jan Beulich <jbeul...@suse.com>
> > Date: Wed Jul 5 09:49:16 2023 +0200
> >
> > x86: yet more PR target/100711-like splitting
> >
> > caused
> >
> > FAIL: gcc.target/i386/pr100711-1.c scan-assembler-times pandn 2
> > FAIL: gcc.target/i386/pr100711-2.c scan-assembler-times vpandn 8
>
> I expect the same applies here - -mno-avx512f (or -mno-avx512vl) might
For this one, we can just add -mno-avx512f to the testcase,it aims to
optimize pandn for avx2 target.
> address this failure. But whether that's really the way to go I'm not
> sure of. Plus of course such adjustments should have been done ahead
> of time, when it was decided that testing with certain -march= settings
> is a goal. My changes have merely uncovered the prior omissions.
It's not a standard request, it's just our private tester which is
used to find gcc bugs and miss-optimizations.
It sometimes generates false positive reports (usually adding
-mno-avx512f to the testcase can fix that), hope that's not too
annoying.
>
> Jan
>
> > with GCC configured with
> >
> > ../../gcc/configure
> > --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r14-2314/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/pr100711-1.c
> > --target_board='unix{-m32\ -march=cascadelake}'"
> > $ cd {build_dir}/gcc && make check
> > RUNTESTFLAGS="i386.exp=gcc.target/i386/pr100711-2.c
> > --target_board='unix{-m32\ -march=cascadelake}'"
> >
> > (Please do not reply to this email, for question about this report, contact
> > me at haochen dot jiang at intel.com)
>
--
BR,
Hongtao
