[PATCH] D95086: [DAGCombiner] Transform (zext (select c, load1, load2)) -> (select c, zextload1, zextload2)

[Guozhi Wei via Phabricator via llvm-commits]

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If extload is legal, following transform

  (zext (select c, load1, load2)) -> (select c, zextload1, zextload2)

can save one ext instruction.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D95086

Files:
  llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  llvm/test/CodeGen/X86/select-ext.ll

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