On Fri, Apr 18, 2025, 7:29 PM haochen.jiang <haoch...@smtp.intel.com> wrote:
> On Linux/x86_64,
>
> 94f275432f7ea4781ec7c05fa9d1d81ef6cb3fc1 is the first bad commit
> commit 94f275432f7ea4781ec7c05fa9d1d81ef6cb3fc1
> Author: Andrew Pinski <quic_apin...@quicinc.com>
> Date: Thu Feb 20 16:09:05 2025 -0800
>
> gimple-fold: Improve optimize_memcpy_to_memset to handle STRING_CST
> [PR78408]
>
> caused
>
> FAIL: gcc.dg/pr78408-3.c scan-tree-dump-times forwprop1 "after previous" 1
>
I have a fix for this testcase and the other one already. Will commit it
tomorrow. It is just a testcase issue as the testcase gets optimized
correctly; just in a different way than what this patch expects.
> with GCC configured with
>
> ../../gcc/configure
> --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r16-22/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/pr78408-3.c
> --target_board='unix{-m32\ -march=cascadelake}'"
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/pr78408-3.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.)
>
