[all-commits] [llvm/llvm-project] 79435d: [ConstantFold] Support scalable constant splats in...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 79435de8a51a3df4b74f858a604b7ff56b342ae7
      https://github.com/llvm/llvm-project/commit/79435de8a51a3df4b74f858a604b7ff56b342ae7
  Author: Luke Lau <luke at igalia.com>
  Date:   2025-04-03 (Thu, 03 Apr 2025)

  Changed paths:
    M llvm/lib/IR/ConstantFold.cpp
    M llvm/test/Analysis/ValueTracking/known-bits-from-operator-constexpr.ll
    M llvm/test/Transforms/InstCombine/addrspacecast.ll
    M llvm/test/Transforms/InstCombine/scalable-const-fp-splat.ll
    M llvm/test/Transforms/InstCombine/scalable-trunc.ll
    M llvm/test/Transforms/InstSimplify/ConstProp/cast-vector.ll
    M llvm/test/Transforms/InstSimplify/ConstProp/vscale-inseltpoison.ll
    M llvm/test/Transforms/InstSimplify/ConstProp/vscale.ll
    M llvm/test/Transforms/InstSimplify/vscale-inseltpoison.ll
    M llvm/test/Transforms/InstSimplify/vscale.ll
    M llvm/test/Transforms/LoopVectorize/AArch64/induction-costs-sve.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/truncate-to-minimal-bitwidth-cost.ll
    M llvm/test/Transforms/LoopVectorize/RISCV/truncate-to-minimal-bitwidth-evl-crash.ll
    M llvm/test/Transforms/MemCpyOpt/crash.ll
    M llvm/test/Transforms/VectorCombine/pr88796.ll

  Log Message:
  -----------
  [ConstantFold] Support scalable constant splats in ConstantFoldCastInstruction (#133207)

Previously only fixed vector splats were handled. This adds supports for
scalable vectors too by allowing ConstantExpr splats.

We need to add the extra V->getType()->isVectorTy() check because a
ConstantExpr might be a scalar to vector bitcast.

By allowing ConstantExprs this also allow fixed vector ConstantExprs to
be folded, which causes the diffs in
llvm/test/Analysis/ValueTracking/known-bits-from-operator-constexpr.ll
and llvm/test/Transforms/InstSimplify/ConstProp/cast-vector.ll. I can
remove them from this PR if reviewers would prefer.

Fixes #132922



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