[PATCH] D123023: [DAG] SimplifySetCC - relax fold (X^C1) == C2 --> X == C1^C2

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: dmgreen, spatel, craig.topper.
Herald added subscribers: StephenFan, pengfei, atanasyan, jrtc27, hiraditya, arichardson, sdardis.
Herald added a project: All.
RKSimon requested review of this revision.
Herald added a project: LLVM.

Remove limitation that wouldn't perform the fold if all the inverted bits are known zero

The thumb2 changes look to be benign, although it does show that the TEQ/TST isel patterns could probably be improved?

Fixes movmsk regression in D122754 <https://reviews.llvm.org/D122754>

I'm not sure who is actively reviewing MIPS codegen at the moment, and thats the one case which shows a notable improvement :-(


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D123023

Files:
  llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
  llvm/test/CodeGen/Mips/countleading.ll
  llvm/test/CodeGen/Thumb2/thumb2-teq.ll
  llvm/test/CodeGen/X86/peep-test-3.ll

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