https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92686
--- Comment #4 from Hongtao.liu <crazylht at gmail dot com> --- (In reply to Richard Biener from comment #2) > It would be definitely nice to have this. Maybe add a tunable whether to use > mask registers for SSE/AVX2? Sure for 128/256-bit vector under avx512f. > Is there any boost frequency penalty for using them? not see any frequency penalty by using mask register. > Using mask registers also looks like a way to reduce register pressure > (in case the register pressure is not on the masks side). Yes, it would save 1 vector register(using for mask) and 1 instruction(vpblendvb)
