https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106117
--- Comment #3 from Hongtao.liu <crazylht at gmail dot com> --- we're using -fexcess-precision=16 to force operation-by-operation translation when AVX512-FP16 is not available. https://gcc.gnu.org/pipermail/gcc-patches/2021-August/576493.html
