On Linux/x86_64,

b88adba751da635c6f0c353c5bc51bbe2ecf4c89 is the first bad commit
commit b88adba751da635c6f0c353c5bc51bbe2ecf4c89
Author: Liwei Xu liwei.xu@intel.com<mailto:liwei.xu@intel.com>
Date:   Fri Sep 23 13:46:02 2022 +0800

Optimize nested permutation to single VEC_PERM_EXPR [PR54346]

caused

FAIL: gcc.dg/tree-ssa/forwprop-19.c scan-tree-dump-not forwprop1 .VEC_PERM_EXPR.

with GCC configured with

../../gcc/configure --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r13-3212/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/forwprop-19.c --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="tree-ssa.exp=gcc.dg/tree-ssa/forwprop-19.c --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="tree-ssa.exp=gcc.dg/tree-ssa/forwprop-19.c --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="tree-ssa.exp=gcc.dg/tree-ssa/forwprop-19.c --target_board='unix{-m64\ -march=cascadelake}'"