[PATCH] D62793: [X86] X86DAGToDAGISel::matchBitExtract(): pattern b: truncation awareness

[Roman Lebedev via Phabricator via llvm-commits]

lebedev.ri updated this revision to Diff 202612.
lebedev.ri edited the summary of this revision.
lebedev.ri added a comment.

Rebased, extra test exposed an alternative way to still end up
with unrecognized pattern with truncation, so handle it too.

This resulted in inlining `isBitwiseNot()`, not sure if it would be better to extend it with all that instead?


Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D62793/new/

https://reviews.llvm.org/D62793

Files:
  include/llvm/CodeGen/SelectionDAGNodes.h
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  lib/Target/X86/X86ISelDAGToDAG.cpp
  test/CodeGen/X86/extract-bits.ll
  test/CodeGen/X86/extract-lowbits.ll

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