https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80571
--- Comment #2 from Peter Cordes <peter at cordes dot ca> --- I think hjl's patch for PR 89071 / PR 87007 fixes (most of?) this, at least for AVX. If register pressure is an issue, using a reg holding a arbitrary constant (instead of xor-zeroed) is a valid option, as this bug points out. So I'm not sure we should close this as a duplicate of those fixed bugs.
