On Linux/x86_64,

3c8d8c0be95e99dc0cba7f6fad2429243582119f is the first bad commit
commit 3c8d8c0be95e99dc0cba7f6fad2429243582119f
Author: liuhongt <hongtao....@intel.com>
Date:   Thu Oct 14 09:31:03 2021 +0800

    Adjust testcase for O2 vectorization.

caused

FAIL: gcc.dg/Warray-bounds-51.c (test for excess errors)
FAIL: gcc.dg/Wstringop-overflow-14.c pr102706 (test for warnings, line 40)
FAIL: gcc.dg/Wstringop-overflow-14.c (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/local/skpandey/gccwork/toolwork/gcc-bisect-master/master/r12-4523/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.exp=gcc.dg/Warray-bounds-51.c --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=gcc.dg/Warray-bounds-51.c --target_board='unix{-m64\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=gcc.dg/Wstringop-overflow-14.c --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=gcc.dg/Wstringop-overflow-14.c --target_board='unix{-m64\ 
-march=cascadelake}'"

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