On Linux/x86_64,

a239a63f868e29e9276088e7c0fb00804c2903ba is the first bad commit
commit a239a63f868e29e9276088e7c0fb00804c2903ba
Author: Aldy Hernandez <al...@redhat.com>
Date:   Fri Nov 4 22:24:42 2022 +0100

    Improve multiplication by powers of 2 in range-ops.

caused

FAIL: g++.dg/pr71488.C   (test for excess errors)
FAIL: g++.dg/warn/Warray-bounds-16.C  -std=gnu++14 (test for excess errors)
FAIL: g++.dg/warn/Warray-bounds-16.C  -std=gnu++17 (test for excess errors)
FAIL: g++.dg/warn/Warray-bounds-16.C  -std=gnu++20 (test for excess errors)
FAIL: g++.dg/warn/Warray-bounds-16.C  -std=gnu++98 (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/export/users/haochenj/src/gcc-bisect/master/master/r13-3761/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=g++.dg/pr71488.C 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/pr71488.C 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/pr71488.C 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="dg.exp=g++.dg/pr71488.C 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=g++.dg/warn/Warray-bounds-16.C --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="dg.exp=g++.dg/warn/Warray-bounds-16.C --target_board='unix{-m32\ 
-march=cascadelake}'"

(Please do not reply to this email, for question about this report, contact me 
at haochen dot jiang at intel.com)

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