On Linux/x86_64,

6dc90c4dbb6f9589dea9c670c3468496bb207de5 is the first bad commit
commit 6dc90c4dbb6f9589dea9c670c3468496bb207de5
Author: Jan Hubicka <j...@suse.cz>
Date:   Tue Nov 16 23:01:28 2021 +0100

    Use modref summaries for byte-wise dead store elimination.

caused

FAIL: gcc.dg/tree-ssa/modref-dse-4.c scan-tree-dump dse2 "Deleted dead store: 
kill_me"

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r12-5324/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="tree-ssa.exp=gcc.dg/tree-ssa/modref-dse-4.c 
--target_board='unix{-m32\ -march=cascadelake}'"

(Please do not reply to this email, for question about this report, contact me 
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