1//===- LowerAtomic.h - Lower atomic intrinsics ------------------*- C++ -*-===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8/// \file
9// This pass lowers atomic intrinsics to non-atomic form for use in a known
10// non-preemptible environment.
11///
12//===----------------------------------------------------------------------===//
13
14#ifndef LLVM_TRANSFORMS_UTILS_LOWERATOMIC_H
15#define LLVM_TRANSFORMS_UTILS_LOWERATOMIC_H
16
17#include "llvm/IR/Instructions.h"
18
19namespace llvm {
20
21class IRBuilderBase;
22
23/// Convert the given Cmpxchg into primitive load and compare.
24bool lowerAtomicCmpXchgInst(AtomicCmpXchgInst *CXI);
25
26/// Convert the given RMWI into primitive load and stores,
27/// assuming that doing so is legal. Return true if the lowering
28/// succeeds.
29bool lowerAtomicRMWInst(AtomicRMWInst *RMWI);
30
31/// Emit IR to implement the given atomicrmw operation on values in registers,
32/// returning the new value.
33Value *buildAtomicRMWValue(AtomicRMWInst::BinOp Op, IRBuilderBase &Builder,
34 Value *Loaded, Value *Val);
35}
36
37#endif // LLVM_TRANSFORMS_UTILS_LOWERATOMIC_H
38