[all-commits] [llvm/llvm-project] de2b6c: [InstCombine] Fold icmp over select of cmp more ag...

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: de2b6cb6ab6472a13c68ddcd963aa2f25e298772
      https://github.com/llvm/llvm-project/commit/de2b6cb6ab6472a13c68ddcd963aa2f25e298772
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2024-08-22 (Thu, 22 Aug 2024)

  Changed paths:
    M llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
    M llvm/test/Transforms/InstCombine/select-cmp.ll

  Log Message:
  -----------
  [InstCombine] Fold icmp over select of cmp more aggressively (#105536)

When folding an icmp into a select, treat an icmp of a constant with a
one-use ucmp/scmp intrinsic as a simplification. These comparisons will
reduce down to an icmp.

This addresses a regression seen in Rust and also in llvm-opt-benchmark.



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