On Sun, Nov 23, 2025 at 9:21 AM Haochen Jiang <[email protected]> wrote:
>
> On Linux/x86_64,
>
> ed1911b9f1f1ab0c1b631f0b6427b798c7056200 is the first bad commit
> commit ed1911b9f1f1ab0c1b631f0b6427b798c7056200
> Author: Kugan Vivekanandarajah <[email protected]>
> Date: Sun Nov 23 15:27:10 2025 +1100
>
> [tree-optimization] Allow LICM to hoist loads in "self write" patterns
>
> caused
>
> FAIL: gcc.dg/vect/bb-slp-41.c -flto -ffat-lto-objects scan-tree-dump-not
> slp1 "vectorizing stmts using SLP"
> FAIL: gcc.dg/vect/bb-slp-41.c scan-tree-dump-not slp1 "vectorizing stmts
> using SLP"
The vectorization done is sensible. The testcase doesn't check was it
was intended to ...
we now SLP vectorize the scalar epilog we now unroll. I can't guess
what we didn't want to
vectorize (some CTOR, obviously). The testcase was added in
r10-4336-g818b3293f4545d.
I'll fix the testcase in the most reasonable way
Richard.
> with GCC configured with
>
> ../../gcc/configure
> --prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-5526/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="vect.exp=gcc.dg/vect/bb-slp-41.c --target_board='unix{-m32}'"
> $ cd {build_dir}/gcc && make check
> RUNTESTFLAGS="vect.exp=gcc.dg/vect/bb-slp-41.c --target_board='unix{-m32\
> -march=cascadelake}'"
> $ cd {build_dir}/gcc && make check
> RUNTESTFLAGS="vect.exp=gcc.dg/vect/bb-slp-41.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.)
