[r15-6810 Regression] FAIL: gcc.dg/vect/vect-121.c scan-tree-dump-not optimized "Invalid sum" on Linux/x86_64

[haochen.jiang]

On Linux/x86_64,

f4e259b4a66c81c234608056117836e13606e4c8 is the first bad commit
commit f4e259b4a66c81c234608056117836e13606e4c8
Author: Alex Coplan <alex.coplan@arm.com>
Date:   Thu Jul 25 16:34:05 2024 +0000

    vect: Ensure we add vector skip guard even when versioning for aliasing [PR118211]

caused

FAIL: gcc.dg/vect/vect-121.c -flto -ffat-lto-objects  scan-tree-dump-not optimized "Invalid sum"
FAIL: gcc.dg/vect/vect-121.c scan-tree-dump-not optimized "Invalid sum"

with GCC configured with

../../gcc/configure --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r15-6810/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/vect-121.c --target_board='unix{-m32}'"

(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.)