[r14-3148 Regression] FAIL: gcc.dg/vect/bb-slp-subgroups-2.c scan-tree-dump-times slp2 "optimized: basic block" 2 on Linux/x86_64

[r14-3148 Regression] FAIL: gcc.dg/vect/bb-slp-subgroups-2.c scan-tree-dump-times slp2 "optimized: basic block" 2 on Linux/x86_64

[Jiang, Haochen]

From: haochen.jiang <haochenj@shliclel4214.sh.intel.com> 
Sent: Tuesday, August 15, 2023 5:26 PM
To: rguenther@suse.de; gcc-regression@gcc.gnu.org; gcc-patches@gcc.gnu.org; Jiang, Haochen <haochen.jiang@intel.com>
Subject: [r14-3148 Regression] FAIL: gcc.dg/vect/bb-slp-subgroups-2.c scan-tree-dump-times slp2 "optimized: basic block" 2 on Linux/x86_64

On Linux/x86_64,

3a13884b23ae32b43d56d68a9c6bd4ce53d60017 is the first bad commit commit 3a13884b23ae32b43d56d68a9c6bd4ce53d60017
Author: Richard Biener <rguenther@suse.de>
Date:   Fri Aug 11 12:08:10 2023 +0200

    Improve BB vectorization opt-info

caused

FAIL: gcc.dg/vect/bb-slp-subgroups-2.c -flto -ffat-lto-objects  scan-tree-dump-times slp2 "optimized: basic block" 2
FAIL: gcc.dg/vect/bb-slp-subgroups-2.c scan-tree-dump-times slp2 "optimized: basic block" 2

with GCC configured with

../../gcc/configure --prefix=/export/users/haochenj/src/gcc-bisect/master/master/r14-3148/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-subgroups-2.c --target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="vect.exp=gcc.dg/vect/bb-slp-subgroups-2.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.)
(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.)