On Linux/x86_64,

4c7731081647c22cbd249dc0faa20c3df9ed6411 is the first bad commit
commit 4c7731081647c22cbd249dc0faa20c3df9ed6411
Author: Richard Biener <rguent...@suse.de>
Date:   Wed Sep 29 11:18:23 2021 +0200

    Fix peeling for alignment with negative step

caused

FAIL: gcc.dg/torture/pr65270-1.c   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  execution test
FAIL: gcc.dg/torture/pr65270-1.c   -O3 -g  execution test
FAIL: gcc.dg/torture/pr65270-2.c   -O3 -fomit-frame-pointer -funroll-loops 
-fpeel-loops -ftracer -finline-functions  execution test
FAIL: gcc.dg/torture/pr65270-2.c   -O3 -g  execution test

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r12-3958/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="dg-torture.exp=gcc.dg/torture/pr65270-1.c 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg-torture.exp=gcc.dg/torture/pr65270-1.c 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg-torture.exp=gcc.dg/torture/pr65270-2.c 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg-torture.exp=gcc.dg/torture/pr65270-2.c 
--target_board='unix{-m64\ -march=cascadelake}'"

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