LLVM 20.0.0git
LowerAtomic.h
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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
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
BinOp
This enumeration lists the possible modifications atomicrmw can make.
Definition: Instructions.h:708
This is an optimization pass for GlobalISel generic memory operations.
Definition: AddressRanges.h:18
Value * buildAtomicRMWValue(AtomicRMWInst::BinOp Op, IRBuilderBase &Builder, Value *Loaded, Value *Val)
Emit IR to implement the given atomicrmw operation on values in registers, returning the new value.
Definition: LowerAtomic.cpp:42
DWARFExpression::Operation Op
bool lowerAtomicCmpXchgInst(AtomicCmpXchgInst *CXI)
Convert the given Cmpxchg into primitive load and compare.
Definition: LowerAtomic.cpp:22
bool lowerAtomicRMWInst(AtomicRMWInst *RMWI)
Convert the given RMWI into primitive load and stores, assuming that doing so is legal.