[all-commits] [llvm/llvm-project] bf397b: [IR] Add elementwise modifier to atomic loads (#20...

[Harrison Hao via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bf397be011e2cecce6ca0c1d0342eef217a06059
      https://github.com/llvm/llvm-project/commit/bf397be011e2cecce6ca0c1d0342eef217a06059
  Author: Harrison Hao <57025411+harrisonGPU at users.noreply.github.com>
  Date:   2026-07-16 (Thu, 16 Jul 2026)

  Changed paths:
    M llvm/docs/LangRef.md
    M llvm/include/llvm/IR/Instructions.h
    M llvm/lib/AsmParser/LLParser.cpp
    M llvm/lib/Bitcode/Reader/BitcodeReader.cpp
    M llvm/lib/Bitcode/Writer/BitcodeWriter.cpp
    M llvm/lib/IR/AsmWriter.cpp
    M llvm/lib/IR/Instruction.cpp
    M llvm/lib/IR/Instructions.cpp
    M llvm/lib/IR/Verifier.cpp
    M llvm/test/Assembler/atomic.ll
    A llvm/test/Assembler/invalid-load-store-atomic-elementwise.ll
    A llvm/test/Bitcode/atomic-load-store-elementwise.ll
    M llvm/test/Bitcode/compatibility.ll
    M llvm/unittests/IR/VerifierTest.cpp

  Log Message:
  -----------
  [IR] Add elementwise modifier to atomic loads (#204556)

Add an `elementwise` modifier to atomic loads to represent
per-element atomic semantics for fixed-vector loads.

Without the modifier, a vector atomic load remains a whole-value
atomic operation. With `elementwise`, the load behaves as if it were
expanded into one scalar atomic load per fixed-vector element, without
providing atomicity for the vector value as a whole.

Discussion:
https://discourse.llvm.org/t/rfc-add-elementwise-modifier-to-atomic-loads-and-stores/91100



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