[all-commits] [llvm/llvm-project] 4fd5d9: [RISCV] Emitting proper atomic ABI tag when Zalasr...

[Brendan Sweeney via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4fd5d935a3d30d20aed7697be5d8bb76dae8eab6
      https://github.com/llvm/llvm-project/commit/4fd5d935a3d30d20aed7697be5d8bb76dae8eab6
  Author: Brendan Sweeney <brs at eecs.berkeley.edu>
  Date:   2025-03-03 (Mon, 03 Mar 2025)

  Changed paths:
    M llvm/lib/Target/RISCV/MCTargetDesc/RISCVTargetStreamer.cpp
    M llvm/test/CodeGen/RISCV/attributes.ll

  Log Message:
  -----------
  [RISCV] Emitting proper atomic ABI tag when Zalasr is enabled (#121017)

When Zalasr is enabled, it will emit the A7 atomic ABI tag. Zalasr is
the load-acquire and store-release extension, and the reason A7 (and
A6S) exists is to support it.

The A7 atomic ABI is compatible with A6S (which is what is currently
emitted as the tag), but A7 is not compatible with A6C, while A6C and
A6S are compatible.


https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-atomic.adoc#risc-v-atomics-mappings


https://github.com/riscv-non-isa/riscv-elf-psabi-doc/blob/master/riscv-elf.adoc#tag_riscv_atomic_abi-14-uleb128version



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