[all-commits] [llvm/llvm-project] ade43a: [WebAssembly] MC support for acquire-release atomi...

[Derek Schuff via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ade43a54d4419b60eda48cb0ebe84df836893bf6
      https://github.com/llvm/llvm-project/commit/ade43a54d4419b60eda48cb0ebe84df836893bf6
  Author: Derek Schuff <dschuff at chromium.org>
  Date:   2026-03-04 (Wed, 04 Mar 2026)

  Changed paths:
    M llvm/include/llvm/BinaryFormat/Wasm.h
    M llvm/lib/Target/WebAssembly/AsmParser/WebAssemblyAsmParser.cpp
    M llvm/lib/Target/WebAssembly/Disassembler/WebAssemblyDisassembler.cpp
    M llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyInstPrinter.cpp
    M llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyInstPrinter.h
    M llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCCodeEmitter.cpp
    M llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyMCTargetDesc.h
    M llvm/lib/Target/WebAssembly/WebAssembly.td
    M llvm/lib/Target/WebAssembly/WebAssemblyInstrAtomics.td
    M llvm/lib/Target/WebAssembly/WebAssemblyInstrInfo.td
    M llvm/lib/Target/WebAssembly/WebAssemblySubtarget.h
    M llvm/test/CodeGen/WebAssembly/atomic-fence.mir
    A llvm/test/MC/WebAssembly/atomics-orderings-errors.s
    A llvm/test/MC/WebAssembly/atomics-orderings.s

  Log Message:
  -----------
  [WebAssembly] MC support for acquire-release atomics (#183656)

Initial support for acquire-release atomics, specified as part of
https://github.com/WebAssembly/shared-everything-threads

This adds an ordering operand to atomic loads, stores, RMWs,
wait/notify,
and fences. It currently defaults to 0 and ISel is not updated yet, so
atomics produced by the compiler will still always be seqcst.

Asm parsing and printing, binary emission and disassembly are all
updated. Binary emission will always use the old encoding because the
encoding is smaller, and to get backwards compatibility for free.



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