On Linux/x86_64,

d34cda720988674bcf8a24267c9e1ec61335d6de is the first bad commit
commit d34cda720988674bcf8a24267c9e1ec61335d6de
Author: Richard Biener <rguent...@suse.de>
Date:   Fri Sep 29 12:54:17 2023 +0200

    Handle non-grouped stores as single-lane SLP

caused

FAIL: gcc.dg/vect/slp-19c.c -flto -ffat-lto-objects  scan-tree-dump-times vect 
"vectorized 1 loops" 1
FAIL: gcc.dg/vect/slp-19c.c -flto -ffat-lto-objects  scan-tree-dump-times vect 
"vectorizing stmts using SLP" 1
FAIL: gcc.dg/vect/slp-19c.c scan-tree-dump-times vect "vectorized 1 loops" 1
FAIL: gcc.dg/vect/slp-19c.c scan-tree-dump-times vect "vectorizing stmts using 
SLP" 1
FAIL: gcc.target/i386/cond_op_fma_double-1.c scan-assembler-times vfmadd132pd[ 
\\t]+[^{\n]*%ymm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 1
FAIL: gcc.target/i386/cond_op_fma_double-1.c scan-assembler-times vfmsub132pd[ 
\\t]+[^{\n]*%ymm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 1
FAIL: gcc.target/i386/cond_op_fma_double-1.c scan-assembler-times vfnmadd132pd[ 
\\t]+[^{\n]*%ymm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 1
FAIL: gcc.target/i386/cond_op_fma_double-1.c scan-assembler-times vfnmsub132pd[ 
\\t]+[^{\n]*%ymm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 1
FAIL: gcc.target/i386/cond_op_fma__Float16-1.c scan-assembler-times 
vfmadd132ph[ \\t]+[^{\n]*%ymm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 1
FAIL: gcc.target/i386/cond_op_fma__Float16-1.c scan-assembler-times 
vfmsub132ph[ \\t]+[^{\n]*%ymm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 1
FAIL: gcc.target/i386/cond_op_fma__Float16-1.c scan-assembler-times 
vfnmadd132ph[ \\t]+[^{\n]*%ymm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 1
FAIL: gcc.target/i386/cond_op_fma__Float16-1.c scan-assembler-times 
vfnmsub132ph[ \\t]+[^{\n]*%ymm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 1
FAIL: gcc.target/i386/cond_op_fma_float-1.c scan-assembler-times vfmadd132ps[ 
\\t]+[^{\n]*%ymm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 1
FAIL: gcc.target/i386/cond_op_fma_float-1.c scan-assembler-times vfmsub132ps[ 
\\t]+[^{\n]*%ymm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 1
FAIL: gcc.target/i386/cond_op_fma_float-1.c scan-assembler-times vfnmadd132ps[ 
\\t]+[^{\n]*%ymm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 1
FAIL: gcc.target/i386/cond_op_fma_float-1.c scan-assembler-times vfnmsub132ps[ 
\\t]+[^{\n]*%ymm[0-9]+{%k[1-7]}(?:\n|[ \\t]+#) 1
FAIL: gcc.target/i386/pr88531-2b.c scan-assembler-times vmulps 1
FAIL: gcc.target/i386/pr88531-2c.c scan-assembler-times vmulps 1

with GCC configured with

../../gcc/configure 
--prefix=/export/users/haochenj/src/gcc-bisect/master/master/r15-3509/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/slp-19c.c 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="vect.exp=gcc.dg/vect/slp-19c.c 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="vect.exp=gcc.dg/vect/slp-19c.c 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="vect.exp=gcc.dg/vect/slp-19c.c 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/cond_op_fma_double-1.c 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/cond_op_fma_double-1.c 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/cond_op_fma_double-1.c 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/cond_op_fma_double-1.c 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/cond_op_fma__Float16-1.c 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/cond_op_fma__Float16-1.c 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/cond_op_fma__Float16-1.c 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/cond_op_fma__Float16-1.c 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/cond_op_fma_float-1.c 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/cond_op_fma_float-1.c 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/cond_op_fma_float-1.c 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/cond_op_fma_float-1.c 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/pr88531-2b.c --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/pr88531-2b.c --target_board='unix{-m64\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/pr88531-2c.c --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/pr88531-2c.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.)

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