[all-commits] [llvm/llvm-project] b189b8: [InstCombine] Relax the conditons of fold of `ucmp...

[Volodymyr Vasylkun via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b189b89bdeb74a933016bef6d85ae42b0c62b40e
      https://github.com/llvm/llvm-project/commit/b189b89bdeb74a933016bef6d85ae42b0c62b40e
  Author: Volodymyr Vasylkun <vvmposeydon at gmail.com>
  Date:   2024-09-23 (Mon, 23 Sep 2024)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
    M llvm/test/Transforms/InstCombine/phi-with-multiple-unsimplifiable-values.ll

  Log Message:
  -----------
  [InstCombine] Relax the conditons of fold of `ucmp`/`scmp` into phi by allowing the phi node to use the result of `ucmp`/`scmp` more than once (#109593)

This extends the optimisation implemented in #107769 by relaxing the
condtions to make it happen. Now, the value produced by `ucmp`/`scmp`
doesn't need to be one-use, but only one-user, meaning it can be present
in a single phi node more than once.



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