[r13-2288 Regression] FAIL: gcc.dg/vect/bb-slp-pr54400.c scan-tree-dump-not slp2 " = VEC_PERM_EXPR" on Linux/x86_64

[haochen.jiang]

On Linux/x86_64,

61c4c989034548f481d1f10198447be27fb9a55f is the first bad commit
commit 61c4c989034548f481d1f10198447be27fb9a55f
Author: Richard Sandiford <richard.sandiford@arm.com>
Date:   Tue Aug 30 15:43:47 2022 +0100

    Extend SLP permutation optimisations

caused

FAIL: gcc.dg/vect/bb-slp-pr54400.c -flto -ffat-lto-objects  scan-tree-dump-not slp2 " = VEC_PERM_EXPR"
FAIL: gcc.dg/vect/bb-slp-pr54400.c scan-tree-dump-not slp2 " = VEC_PERM_EXPR"

with GCC configured with

../../gcc/configure --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r13-2288/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-pr54400.c --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="vect.exp=gcc.dg/vect/bb-slp-pr54400.c --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="vect.exp=gcc.dg/vect/bb-slp-pr54400.c --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="vect.exp=gcc.dg/vect/bb-slp-pr54400.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)