[all-commits] [llvm/llvm-project] fcad2b: [RISC-V] Add proposed mapping for Ztso

[patrick-rivos via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: fcad2bbcfc1f0acaa91fe03b71ff069975f80c8e
      https://github.com/llvm/llvm-project/commit/fcad2bbcfc1f0acaa91fe03b71ff069975f80c8e
  Author: Patrick O'Neill <patrick at rivosinc.com>
  Date:   2023-08-10 (Thu, 10 Aug 2023)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVExpandAtomicPseudoInsts.cpp
    M llvm/lib/Target/RISCV/RISCVFeatures.td
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/lib/Target/RISCV/RISCVInstrInfoA.td
    M llvm/test/CodeGen/RISCV/atomic-cmpxchg.ll
    M llvm/test/CodeGen/RISCV/atomic-load-store.ll
    M llvm/test/CodeGen/RISCV/atomic-rmw.ll

  Log Message:
  -----------
  [RISC-V] Add proposed mapping for Ztso

Currently LLVM emits Ztso code for fences, loads, and stores (behind an
experimental flag) [1]. This patch updates the mapping and implements
support for LR/SC and AMO ops. This updated mapping is compatible with
the RVWMO ABI present in the psABI. Additional context can be found in
the psABI pull request [2].

[1] https://reviews.llvm.org/D143076
[2] https://github.com/riscv-non-isa/riscv-elf-psabi-doc/pull/391

Differential Revision: https://reviews.llvm.org/D155517