[PATCH] D116375: [X86] Use bit test instructions to optimize some logic atomic operations

[Phoebe Wang via Phabricator via llvm-commits]

pengfei created this revision.
pengfei added reviewers: LuoYuanke, RKSimon, craig.topper, spatel.
Herald added a subscriber: hiraditya.
pengfei requested review of this revision.
Herald added a project: LLVM.
Herald added a subscriber: llvm-commits.

This is to match GCC's optimizations: https://gcc.godbolt.org/z/3odh9e7WE


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D116375

Files:
  llvm/lib/Target/X86/X86ISelLowering.cpp
  llvm/lib/Target/X86/X86ISelLowering.h
  llvm/lib/Target/X86/X86InstrCompiler.td
  llvm/lib/Target/X86/X86InstrInfo.td
  llvm/test/CodeGen/X86/atomic-bit-test.ll

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