[all-commits] [llvm/llvm-project] 9221f3: [RISCV] Support RISCV Atomics ABI attributes (#84597)

[Paul Kirth via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9221f3af8f832d990be986c05d964ad37e5a2356
      https://github.com/llvm/llvm-project/commit/9221f3af8f832d990be986c05d964ad37e5a2356
  Author: Paul Kirth <paulkirth at google.com>
  Date:   2024-04-25 (Thu, 25 Apr 2024)

  Changed paths:
    M lld/ELF/Arch/RISCV.cpp
    M lld/test/ELF/riscv-attributes.s
    M llvm/include/llvm/Support/RISCVAttributeParser.h
    M llvm/include/llvm/Support/RISCVAttributes.h
    M llvm/lib/Support/RISCVAttributeParser.cpp
    M llvm/lib/Support/RISCVAttributes.cpp
    M llvm/lib/Target/RISCV/MCTargetDesc/RISCVTargetStreamer.cpp
    M llvm/test/CodeGen/RISCV/attributes.ll
    M llvm/test/MC/RISCV/attribute.s
    M llvm/test/MC/RISCV/invalid-attribute.s

  Log Message:
  -----------
  [RISCV] Support RISCV Atomics ABI attributes (#84597)

This patch adds support for the `atomic_abi` attribute, specifid in

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

The atomics_abi tag merging is conducted as follows:

- UNKNOWN is safe to merge with all other values.
- A6C is compatible with A6S, and results in the A6C ABI.
- A6C is incompatible with A7, and results in an error.
- A6S and A7 are compatible, and merging results in the A7 ABI.

Note: the A7 is not yet supported in either LLVM or in any current
hardware,
and is therefore ommited from attribute generation in
RISCVTargetStreamer.



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