On Linux/x86_64,

a7acb6dca941db2b1c135107dac3a34a20650d5c is the first bad commit
commit a7acb6dca941db2b1c135107dac3a34a20650d5c
Author: Vladimir N. Makarov <vmaka...@redhat.com>
Date:   Mon Dec 13 13:48:12 2021 -0500

    [PR99531] Modify pseudo class cost calculation when processing move 
involving the pseudo and a hard register

caused

FAIL: gcc.dg/guality/pr43051-1.c   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  -DPREVENT_OPTIMIZATION  line 34 c == 
&a[0]
FAIL: gcc.dg/guality/pr43051-1.c   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  -DPREVENT_OPTIMIZATION  line 39 c == 
&a[0]
FAIL: gcc.target/i386/pr99531.c scan-assembler-not push

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r12-5944/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="guality.exp=gcc.dg/guality/pr43051-1.c 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="guality.exp=gcc.dg/guality/pr43051-1.c --target_board='unix{-m64\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/pr99531.c --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="i386.exp=gcc.target/i386/pr99531.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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