[r16-4468 Regression] FAIL: gcc.dg/ipa/ipcp-cb-spec2.c (test for excess errors) on Linux/x86_64

[Jiang, Haochen]

On Linux/x86_64,

7cd91c7c42eec894c8c13fa68ccc12ec3a047c9a is the first bad commit
commit 7cd91c7c42eec894c8c13fa68ccc12ec3a047c9a
Author: Josef Melcr <jmelc...@gmail.com>
Date:   Thu Oct 16 16:25:29 2025 +0200

    ipa, cgraph: Enable constant propagation to OpenMP kernels.

caused

FAIL: gcc.dg/ipa/ipcp-cb1.c (test for excess errors)
FAIL: gcc.dg/ipa/ipcp-cb-spec1.c (test for excess errors)
FAIL: gcc.dg/ipa/ipcp-cb-spec2.c (test for excess errors)

with GCC configured with

../../gcc/configure 
--prefix=/export/users3/haochenj/src/gcc-bisect/master/master/r16-4468/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="ipa.exp=gcc.dg/ipa/ipcp-cb1.c 
--target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="ipa.exp=gcc.dg/ipa/ipcp-cb1.c 
--target_board='unix{-m32\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="ipa.exp=gcc.dg/ipa/ipcp-cb1.c 
--target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check RUNTESTFLAGS="ipa.exp=gcc.dg/ipa/ipcp-cb1.c 
--target_board='unix{-m64\ -march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ipa.exp=gcc.dg/ipa/ipcp-cb-spec1.c --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ipa.exp=gcc.dg/ipa/ipcp-cb-spec1.c --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ipa.exp=gcc.dg/ipa/ipcp-cb-spec1.c --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ipa.exp=gcc.dg/ipa/ipcp-cb-spec1.c --target_board='unix{-m64\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ipa.exp=gcc.dg/ipa/ipcp-cb-spec2.c --target_board='unix{-m32}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ipa.exp=gcc.dg/ipa/ipcp-cb-spec2.c --target_board='unix{-m32\ 
-march=cascadelake}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ipa.exp=gcc.dg/ipa/ipcp-cb-spec2.c --target_board='unix{-m64}'"
$ cd {build_dir}/gcc && make check 
RUNTESTFLAGS="ipa.exp=gcc.dg/ipa/ipcp-cb-spec2.c --target_board='unix{-m64\ 
-march=cascadelake}'"

(Please directly reply to this email for question about this report.)
(If you met problems with cascadelake related, disabling AVX512F in command 
line might save that.)
(However, please make sure that there is no potential problems with AVX512.)