[PATCH] D143789: [X86] Try harder to convert `{v}blendw` -> `{v}blend{d|ps}`

[Noah Goldstein via Phabricator via llvm-commits]

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`{v}blend{d|ps}` is basically always faster or as fast as `{v}blendw`.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D143789

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/test/CodeGen/X86/combine-sdiv.ll
  llvm/test/CodeGen/X86/shuffle-blendw.ll

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