[PATCH] D110861: X86InstrInfo: Extend optimizeCompareInstr to look across basic blocks.

[Matthias Braun via Phabricator via llvm-commits]

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This extends `optimizeCompareInstr` to continue the backwards search when it reached the beginning of a basic block. If there is a single predecessor block then we can just continue the search in that block and mark the EFLAGS register as live-in.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D110861

Files:
  llvm/lib/Target/X86/X86InstrInfo.cpp
  llvm/test/CodeGen/X86/optimize-compare.mir

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