[all-commits] [llvm/llvm-project] a99e05: [DAG] shouldReduceLoadWidth - add optional<unsigne...

[Simon Pilgrim via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a99e055030f0da61651e808cbb208bb39594cdc0
      https://github.com/llvm/llvm-project/commit/a99e055030f0da61651e808cbb208bb39594cdc0
  Author: Simon Pilgrim <llvm-dev at redking.me.uk>
  Date:   2025-04-23 (Wed, 23 Apr 2025)

  Changed paths:
    M llvm/include/llvm/CodeGen/TargetLowering.h
    M llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
    M llvm/lib/Target/AArch64/AArch64ISelLowering.h
    M llvm/lib/Target/AMDGPU/AMDGPUISelLowering.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUISelLowering.h
    M llvm/lib/Target/BPF/BPFISelLowering.h
    M llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
    M llvm/lib/Target/Hexagon/HexagonISelLowering.h
    M llvm/lib/Target/X86/X86ISelLowering.cpp
    M llvm/lib/Target/X86/X86ISelLowering.h

  Log Message:
  -----------
  [DAG] shouldReduceLoadWidth - add optional<unsigned> byte offset argument (#136723)

Based off feedback for #129695 - we need to be able to determine the
load offset of smaller loads when trying to determine whether a multiple
use load should be split (in particular for AVX subvector extractions).

This patch adds a std::optional<unsigned> ByteOffset argument to
shouldReduceLoadWidth calls for where we know the constant offset to
allow targets to make use of it in future patches.



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