[PATCH] D147728: [X86] Add inst fixup for `unpckpd` -> `unpckqdq`.

[Noah Goldstein via Phabricator via llvm-commits]

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`unpckqdq` seems to be treated as a shuffle from bypass delay
perspective (which makes sense it appears to have shared shuffle units
for all micro-arch).

`unpckqdq` is slightly preferable to `shufpd` as it saves 1-byte of
code size and can be used to replace the micro-fused `rm` version. So,
if the target has no bypass delay, we should do `unpckpd` ->
`unpckqdq` instead of `shufpd.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147728

Files:
  llvm/lib/Target/X86/X86FixupInstTuning.cpp
  llvm/test/CodeGen/X86/tuning-shuffle-unpckpd-avx512.ll
  llvm/test/CodeGen/X86/tuning-shuffle-unpckpd.ll

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