[PATCH] D55813: [X86] Add isel patterns to match BMI/TBMI instructions when lowering has turned the root nodes into one of the flag producing binops.

[Craig Topper via Phabricator via llvm-commits]

craig.topper created this revision.
craig.topper added reviewers: RKSimon, spatel.

This fixes the patterns that have or/and as a root. 'and' is still broken because lowering keeps a CMP and we match it and the and to TEST. To fix this we'll probably need some custom code in X86ISelDAGToDAG or something. I had to look for uses of the CF flag because all these nodes have non-standard CF flag behavior. A real or/xor would always clear CF. In practice we shouldn't be using the CF flag from these nodes as far as I know.


Repository:
  rL LLVM

https://reviews.llvm.org/D55813

Files:
  lib/Target/X86/X86ISelDAGToDAG.cpp
  lib/Target/X86/X86InstrInfo.td
  test/CodeGen/X86/bmi.ll
  test/CodeGen/X86/tbm_patterns.ll

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