Re: [r16-7504 Regression] FAIL: gcc.dg/tree-ssa/copy-prop-aggregate-return-1.c scan-tree-dump-times forwprop1 "after previous" 1 on Linux/x86_64

On Fri, Feb 13, 2026 at 7:32 PM Haochen Jiang <[email protected]> wrote:
>
> On Linux/x86_64,
>
> b960a57e1b00390c2ca9ff1406b72232d379a322 is the first bad commit
> commit b960a57e1b00390c2ca9ff1406b72232d379a322
> Author: Andrew Pinski <[email protected]>
> Date:   Thu Feb 12 20:36:33 2026 -0800
>
>     forwprop: Add copy prop for aggregates into a return [PR95825]
>
> caused
>
> FAIL: gcc.dg/tree-ssa/copy-prop-aggregate-return-1.c scan-tree-dump-times forwprop1 "after previous" 1
>
> with GCC configured with
>
> ../../gcc/configure --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-7504/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="tree-ssa.exp=gcc.dg/tree-ssa/copy-prop-aggregate-return-1.c --target_board='unix{-m32}'"
> $ cd {build_dir}/gcc && make check RUNTESTFLAGS="tree-ssa.exp=gcc.dg/tree-ssa/copy-prop-aggregate-return-1.c --target_board='unix{-m32\ -march=cascadelake}'"

I could not figure out how to get a testcase that works on ia32 so I
limited the testcase instead to x86_64 and aarch64 because I know
there are other targets where this could fail for too and it was
easier to limit it to a few targets where it would work.

Thanks,
Andrew


>
> (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.)