[all-commits] [llvm/llvm-project] 67d247: [InstCombine] Decompose more icmps into masks (#11...

[Nikita Popov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 67d247a441572c046ccd82682ffe1102584f24ec
      https://github.com/llvm/llvm-project/commit/67d247a441572c046ccd82682ffe1102584f24ec
  Author: Nikita Popov <npopov at redhat.com>
  Date:   2024-10-04 (Fri, 04 Oct 2024)

  Changed paths:
    M llvm/include/llvm/Analysis/CmpInstAnalysis.h
    M llvm/lib/Analysis/CmpInstAnalysis.cpp
    M llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
    M llvm/lib/Transforms/InstCombine/InstCombineCompares.cpp
    M llvm/test/Transforms/InstCombine/and-or-icmps.ll

  Log Message:
  -----------
  [InstCombine] Decompose more icmps into masks (#110836)

Extend decomposeBitTestICmp() to handle cases where the resulting
comparison is of the form `icmp (X & Mask) pred C` with non-zero
`C`. Add a flag to allow code to opt-in to this behavior and use it in
the "log op of icmp" fold infrastructure.

This addresses regressions from #97289.

Proofs: https://alive2.llvm.org/ce/z/hUhdbU



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