[all-commits] [llvm/llvm-project] c89c0d: IR: Introduce "thread-model" module flag

[Matt Arsenault via All-commits]

  Branch: refs/heads/users/arsenm/thread-model/introduce-module-flag
  Home:   https://github.com/llvm/llvm-project
  Commit: c89c0d6b3b2e34dbc0a6636952e812cef8dfda9c
      https://github.com/llvm/llvm-project/commit/c89c0d6b3b2e34dbc0a6636952e812cef8dfda9c
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2026-09-10 (Thu, 10 Sep 2026)

  Changed paths:
    M llvm/docs/LangRef.md
    M llvm/include/llvm/CodeGen/CommandFlags.h
    M llvm/include/llvm/IR/Module.h
    M llvm/include/llvm/Support/CodeGen.h
    M llvm/include/llvm/Target/TargetOptions.h
    M llvm/include/llvm/TargetParser/Triple.h
    M llvm/lib/CodeGen/CommandFlags.cpp
    M llvm/lib/IR/Module.cpp
    M llvm/lib/IR/Verifier.cpp
    M llvm/lib/TargetParser/Triple.cpp
    A llvm/test/Assembler/module-flags-thread-model.ll
    A llvm/test/Linker/module-flags-thread-model.ll
    A llvm/test/Verifier/module-flags-thread-model.ll

  Log Message:
  -----------
  IR: Introduce "thread-model" module flag

Introduce the replacement for TargetOptions::ThreadModel, but
does not yet wire up the uses. This maintains the current values,
but I question if it makes sense to retain "posix" as the default.
POSIX sounds very target opinionated, but isn't used in a non-binary
way anywhere. Alternatively we could have a simple singlethread binary
flag, or name this something more general.

Follows the precedents of float-abi. It happens the triple default
is just POSIX, but theoretically targets like AVR should be defaulting
to singlethread.

Co-authored-by: Claude (Claude-Opus-4.8) <noreply at anthropic.com>



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