[PATCH] D147541: [X86] Add InstFixup for masked `unpck{l|h}pd` -> masked `shufpd`

[Noah Goldstein via Phabricator via llvm-commits]

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This is a follow up D147507 <https://reviews.llvm.org/D147507> which removed the prior transformation to
`shufps` which was incorrect as the mask was for 64-bit double
elements, not 32-bit float elements. Using `shufpd` for the
replacement, however, preserves the mask semantics and has the same
benefits as `shufps`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D147541

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

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