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[X86] AMD Zen 3: same-reg AVX XMM VPSUBUS{B,W} is a 1-cycle(!) dep-breaking zero...
authorRoman Lebedev <lebedev.ri@gmail.com>
Fri, 14 May 2021 15:32:34 +0000 (18:32 +0300)
committerRoman Lebedev <lebedev.ri@gmail.com>
Fri, 14 May 2021 17:23:03 +0000 (20:23 +0300)
commit41a5dcdf87ce887952ab3d6b0e7f731849e1df1f
tree58d1477823f1708450757a822aaad5e339737c12tree | snapshot
parent6733fe5c0d9483f7c85ceab40043ce86aeabf881commit | diff
[X86] AMD Zen 3: same-reg AVX XMM VPSUBUS{B,W} is a 1-cycle(!) dep-breaking zero-idiom

Not really mentioned in ref docs, but measures as such.
Yes, this one is also not zero-cycle.
llvm/lib/Target/X86/X86ScheduleZnver3.td diff | blob | history
llvm/test/tools/llvm-mca/X86/Znver3/zero-idioms-avx-xmm.s diff | blob | history
Domain: System / Toolchain;