On Linux/x86_64,

4653b682ef161c3c2fc7bf8462b8f9206a1349e6 is the first bad commit
commit 4653b682ef161c3c2fc7bf8462b8f9206a1349e6
Author: Richard Biener <rguent...@suse.de>
Date:   Tue Mar 5 15:46:24 2024 +0100

    Allow single-lane SLP in-order reductions

caused

FAIL: gcc.dg/vect/vect-cond-reduc-in-order-2-signed-zero.c execution test
FAIL: gcc.dg/vect/vect-cond-reduc-in-order-2-signed-zero.c -flto 
-ffat-lto-objects execution test

with GCC configured with

../../gcc/configure 
--prefix=/export/users/haochenj/src/gcc-bisect/master/master/r15-1056/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-cond-reduc-in-order-2-signed-zero.c 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="vect.exp=gcc.dg/vect/vect-cond-reduc-in-order-2-signed-zero.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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