1 //===- LowerAtomic.cpp - 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_SCALAR_LOWERATOMIC_H 15 #define LLVM_TRANSFORMS_SCALAR_LOWERATOMIC_H 16 17 #include "llvm/IR/PassManager.h" 18 19 namespace llvm { 20 21 /// A pass that lowers atomic intrinsic into non-atomic intrinsics. 22 class LowerAtomicPass : public PassInfoMixin<LowerAtomicPass> { 23 public: 24 PreservedAnalyses run(Function &F, FunctionAnalysisManager &); isRequired()25 static bool isRequired() { return true; } 26 }; 27 28 class AtomicRMWInst; 29 /// Convert the given RMWI into primitive load and stores, 30 /// assuming that doing so is legal. Return true if the lowering 31 /// succeeds. 32 bool lowerAtomicRMWInst(AtomicRMWInst *RMWI); 33 } 34 35 #endif // LLVM_TRANSFORMS_SCALAR_LOWERATOMIC_H 36