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 
19 namespace llvm {
20 
21 class IRBuilderBase;
22 
23 /// Convert the given Cmpxchg into primitive load and compare.
24 bool 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.
29 bool lowerAtomicRMWInst(AtomicRMWInst *RMWI);
30 
31 /// Emit IR to implement the given atomicrmw operation on values in registers,
32 /// returning the new value.
33 Value *buildAtomicRMWValue(AtomicRMWInst::BinOp Op, IRBuilderBase &Builder,
34                            Value *Loaded, Value *Inc);
35 }
36 
37 #endif // LLVM_TRANSFORMS_UTILS_LOWERATOMIC_H
38