[all-commits] [llvm/llvm-project] 6b0807: [AArch64][GlobalISel] Add support for lowering tru...

[Amara Emerson via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6b0807fe2b8af7361f98f0f947a3129a6ab79f7e
      https://github.com/llvm/llvm-project/commit/6b0807fe2b8af7361f98f0f947a3129a6ab79f7e
  Author: Amara Emerson <amara at apple.com>
  Date:   2025-01-06 (Mon, 06 Jan 2025)

  Changed paths:
    M llvm/include/llvm/CodeGen/GlobalISel/LegalizerHelper.h
    M llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp
    M llvm/lib/Target/AArch64/GISel/AArch64LegalizerInfo.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/legalize-bitcast.mir
    M llvm/test/CodeGen/AArch64/GlobalISel/legalize-store-vector-bools.mir
    M llvm/test/CodeGen/AArch64/vec-combine-compare-to-bitmask.ll

  Log Message:
  -----------
  [AArch64][GlobalISel] Add support for lowering trunc stores of vector bools.

This is essentially a port of TargetLowering::scalarizeVectorStore(), which
is used for the case where we have something like a store of <8 x s8> truncating
to <8 x s1> in memory. The naive lowering is a sequence of extracts to compute
a scalar value to store.

AArch64's DAG implementation has some more smarts to improve this further which
we can do later.

Reviewers: topperc, davemgreen

Pull Request: https://github.com/llvm/llvm-project/pull/121169



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