[PATCH] D67875: [X86] X86DAGToDAGISel::matchBEXTRFromAndImm(): if can't use BEXTR, fallback to BZHI (PR43381)

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri updated this revision to Diff 221233.
lebedev.ri edited the summary of this revision.
lebedev.ri added a comment.

Scaling down ambigiousness of the patch: if not using BEXTR, only use BZHI if either the mask is larger than 32-bit, or the load folding will happen.

I'm not sure if it's okay to leave newly-created noted like that if we decide it's not worthwhile folding?


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D67875/new/

https://reviews.llvm.org/D67875

Files:
  llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
  llvm/test/CodeGen/X86/bmi-x86_64.ll
  llvm/test/CodeGen/X86/bmi.ll

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