46 lines
1.8 KiB
C++
46 lines
1.8 KiB
C++
//===- LowerAtomic.h - Lower atomic intrinsics ------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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/// \file
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// This pass lowers atomic intrinsics to non-atomic form for use in a known
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// non-preemptible environment.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_LOWERATOMIC_H
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#define LLVM_TRANSFORMS_UTILS_LOWERATOMIC_H
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#include "llvm/IR/Instructions.h"
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namespace llvm {
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class IRBuilderBase;
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/// Convert the given Cmpxchg into primitive load and compare.
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LLVM_ABI bool lowerAtomicCmpXchgInst(AtomicCmpXchgInst *CXI);
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/// Emit IR to implement the given cmpxchg operation on values in registers,
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/// returning the new value.
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LLVM_ABI std::pair<Value *, Value *> buildCmpXchgValue(IRBuilderBase &Builder,
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Value *Ptr, Value *Cmp,
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Value *Val,
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Align Alignment);
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/// Convert the given RMWI into primitive load and stores,
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/// assuming that doing so is legal. Return true if the lowering
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/// succeeds.
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LLVM_ABI bool lowerAtomicRMWInst(AtomicRMWInst *RMWI);
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/// Emit IR to implement the given atomicrmw operation on values in registers,
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/// returning the new value.
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LLVM_ABI Value *buildAtomicRMWValue(AtomicRMWInst::BinOp Op,
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IRBuilderBase &Builder, Value *Loaded,
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Value *Val);
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}
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#endif // LLVM_TRANSFORMS_UTILS_LOWERATOMIC_H
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