[PATCH] D72995: [MLIR] LLVM Dialect: add llvm.cmpxchg and improve llvm.atomicrmw custom parser

[Frank Laub via Phabricator via llvm-commits]

flaub created this revision.
flaub added a reviewer: ftynse.
Herald added subscribers: llvm-commits, liufengdb, lucyrfox, mgester, arpith-jacob, antiagainst, shauheen, burmako, jpienaar, rriddle, mehdi_amini, jfb.
Herald added a reviewer: nicolasvasilache.
Herald added a project: LLVM.

Add a `llvm.cmpxchg` op as a counterpart to LLVM IR's `cmpxchg` instruction.
Note that the `weak`, `volatile`, and `syncscope` attributes are not yet supported.

This will be useful for upcoming parallel versions of affine.for and generally
for reduction-like semantics (especially for reductions that can't make use
of `atomicrmw`, e.g. `fmax`).


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D72995

Files:
  mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
  mlir/lib/Dialect/LLVMIR/IR/LLVMDialect.cpp
  mlir/test/Dialect/LLVMIR/invalid.mlir
  mlir/test/Dialect/LLVMIR/roundtrip.mlir
  mlir/test/Target/llvmir.mlir

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