https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83828
--- Comment #9 from H.J. Lu <hjl.tools at gmail dot com> --- r257175 gave: FAIL: gcc.target/i386/avx512bitalgvl-vpopcntb-1.c execution test FAIL: gcc.target/i386/avx512bitalgvl-vpopcntw-1.c execution test FAIL: gcc.target/i386/avx512bitalg-vpopcntb-1.c execution test FAIL: gcc.target/i386/avx512bitalg-vpopcntw-1.c execution test on AVX512 machine.