https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100885
--- Comment #4 from Hongtao.liu <crazylht at gmail dot com> --- > Need to adjust the third constraint from (v, vm, C, n) to (Yw, Ywm, C, n) Also for those extend instructions which need AVX512VL is needed for xmm16-xmm32.