https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97770
--- Comment #17 from Hongtao.liu <crazylht at gmail dot com> --- (In reply to Richard Biener from comment #16) > Changing the signature will not help given we don't want to regress other > cases. > Instead we have to somehow remove the pro- and demotions with the help of > patterns. I think using .POPCOUNT should work there. I'm thinking of reimplementing _mm_popcnt_u64 with a backend builtin like __builtin_ia32_popcountll which is defined as ULONGLONG_FTYPE_ULONGLONG, and handle that in TARGET_VECTORIZE_BUILTIN_VECTORIZED_FUNCTION.
