[r14-6559 Regression] FAIL: gcc.dg/guality/pr58791-4.c -Os -DPREVENT_OPTIMIZATION line pr58791-4.c:32 i == 486 on Linux/x86_64

["haochen.jiang" <haochenj@ecsmtp.sh.intel.com>]

On Linux/x86_64,

8afdbcdd7abe1e3c7a81e07f34c256e7f2dbc652 is the first bad commit
commit 8afdbcdd7abe1e3c7a81e07f34c256e7f2dbc652
Author: Di Zhao <dizhao@os.amperecomputing.com>
Date:   Fri Dec 15 03:22:32 2023 +0800

    Consider fully pipelined FMA in get_reassociation_width

caused

FAIL: gcc.dg/pr110279-2.c scan-tree-dump-not reassoc2 "was chosen for reassociation"
FAIL: gcc.dg/pr110279-2.c scan-tree-dump-times optimized "\\.FMA " 3

with GCC configured with

../../gcc/configure --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r14-6559/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="dg.exp=gcc.dg/pr110279-2.c --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=gcc.dg/pr110279-2.c --target_board='unix{-m64}'"

(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.)