[PATCH] D155517: [RISC-V] Add proposed mapping for Ztso

[Patrick O'Neill via Phabricator via llvm-commits]

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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


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D155517

Files:
  llvm/lib/Target/RISCV/RISCVExpandAtomicPseudoInsts.cpp
  llvm/lib/Target/RISCV/RISCVFeatures.td
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/lib/Target/RISCV/RISCVInstrInfo.cpp
  llvm/lib/Target/RISCV/RISCVInstrInfo.h
  llvm/lib/Target/RISCV/RISCVInstrInfoA.td
  llvm/test/CodeGen/RISCV/atomic-cmpxchg.ll
  llvm/test/CodeGen/RISCV/atomic-load-store.ll
  llvm/test/CodeGen/RISCV/atomic-rmw.ll

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