[all-commits] [llvm/llvm-project] fffea2: [MLIR] LLVM Dialect: add llvm.cmpxchg and improve ...

[Frank Laub via All-commits]

  Branch: refs/heads/master
  Home:   https://github.com/llvm/llvm-project
  Commit: fffea2842d2807e6deabeb719774d83e3c490156
      https://github.com/llvm/llvm-project/commit/fffea2842d2807e6deabeb719774d83e3c490156
  Author: Frank Laub <frank.laub at intel.com>
  Date:   2020-01-21 (Tue, 21 Jan 2020)

  Changed paths:
    M mlir/include/mlir/Dialect/LLVMIR/LLVMDialect.h
    M mlir/include/mlir/Dialect/LLVMIR/LLVMOps.td
    M mlir/lib/Dialect/LLVMIR/IR/LLVMDialect.cpp
    M mlir/test/Dialect/LLVMIR/invalid.mlir
    M mlir/test/Dialect/LLVMIR/roundtrip.mlir
    M mlir/test/Target/llvmir.mlir

  Log Message:
  -----------
  [MLIR] LLVM Dialect: add llvm.cmpxchg and improve llvm.atomicrmw custom parser

Summary:
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`).

Reviewers: ftynse, nicolasvasilache

Reviewed By: ftynse

Subscribers: merge_guards_bot, jfb, mehdi_amini, rriddle, jpienaar, burmako, shauheen, antiagainst, arpith-jacob, mgester, lucyrfox, liufengdb, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D72995