[all-commits] [llvm/llvm-project] e8f518: [VectorUtils] Replace maskIsAll{Zero, One}OrUndef w...

[Sean Clarke via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e8f518d6613b950958618db9466a5936d844ff26
      https://github.com/llvm/llvm-project/commit/e8f518d6613b950958618db9466a5936d844ff26
  Author: Sean Clarke <seanedwardsclarke at gmail.com>
  Date:   2026-06-02 (Tue, 02 Jun 2026)

  Changed paths:
    M llvm/include/llvm/Analysis/VectorUtils.h
    M llvm/include/llvm/IR/PatternMatch.h
    M llvm/lib/Analysis/InstructionSimplify.cpp
    M llvm/lib/Analysis/VectorUtils.cpp
    M llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
    M llvm/test/Transforms/InstCombine/masked_intrinsics-inseltpoison.ll
    M llvm/test/Transforms/InstCombine/masked_intrinsics.ll
    M llvm/test/Transforms/InstCombine/pr83947.ll
    M llvm/test/Transforms/InstSimplify/call.ll

  Log Message:
  -----------
  [VectorUtils] Replace maskIsAll{Zero,One}OrUndef with PatternMatch (#200040)

As part of the ongoing effort to deprecate UndefValue, and also to take
better advantage of pattern matching, eliminate the VectorUtils
functions `maskIsAllZeroOrUndef`/`maskIsAllOneOrUndef` and replace them
with new matchers `m_ZeroOrPoison` and `m_AllOnesOrPoison`.

The new matchers are simply `m_CombineOr` on `m_Zero`/`m_AllOnes` and
`m_Poison`. `m_Zero` and `m_AllOnes` already match vectors where some
(but not all) elements are poison, so these matchers were created to
also match the case where all elements are poison.

This affects InstCombine/InstSimplify with a mask containing `undef` for
the intrinsics `llvm.masked.load`, `llvm.masked.store`,
`llvm.masked.gather`, and `llvm.masked.scatter`.

Some relevant tests were altered to use poison instead of undef, and
test coverage for masked loads/stores with poison was increased.



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