[all-commits] [llvm/llvm-project] 79ae40: [ConstantFolding] Fold intrinsics of scalable vect...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 79ae407c95715f0be5a78260c3b135090f679637
      https://github.com/llvm/llvm-project/commit/79ae407c95715f0be5a78260c3b135090f679637
  Author: Luke Lau <luke at igalia.com>
  Date:   2025-05-28 (Wed, 28 May 2025)

  Changed paths:
    M llvm/lib/Analysis/ConstantFolding.cpp
    M llvm/lib/IR/Constants.cpp
    M llvm/test/Transforms/InstSimplify/ConstProp/abs.ll
    M llvm/test/Transforms/InstSimplify/ConstProp/fma.ll
    M llvm/test/Transforms/InstSimplify/exp10.ll

  Log Message:
  -----------
  [ConstantFolding] Fold intrinsics of scalable vectors with splatted operands (#141845)

As noted in
https://github.com/llvm/llvm-project/pull/141821#issuecomment-2917328924,
whilst we currently constant fold intrinsics of fixed-length vectors via
their scalar counterpart, we don't do the same for scalable vectors.

This handles the scalable vector case when the operands are splats.

One weird snag in ConstantVector::getSplat was that it produced a undef
if passed in poison, so this also contains a fix by checking for
PoisonValue before UndefValue.



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