[Bug target/80571] AVX allows multiple vcvtsi2ss/sd (integer -> float/double) to reuse a single dep-breaking vxorps, even hoisting it out of loops

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80571 --- Comment #2 from Peter Cordes --- 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 th

[Bug target/80571] AVX allows multiple vcvtsi2ss/sd (integer -> float/double) to reuse a single dep-breaking vxorps, even hoisting it out of loops

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80571 --- Comment #1 from Peter Cordes --- Tracking "cold" registers that are safe to use as a read-only source (whether or not they're holding a useful value like a constant) has a couple other applications for x86: * vcvtsi2ss/sd %src,%merge_into,