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 /// Emit IR to implement the given cmpxchg operation on values in registers, 27 /// returning the new value. 28 std::pair<Value *, Value *> buildCmpXchgValue(IRBuilderBase &Builder, 29 Value *Ptr, Value *Cmp, 30 Value *Val, Align Alignment); 31 32 /// Convert the given RMWI into primitive load and stores, 33 /// assuming that doing so is legal. Return true if the lowering 34 /// succeeds. 35 bool lowerAtomicRMWInst(AtomicRMWInst *RMWI); 36 37 /// Emit IR to implement the given atomicrmw operation on values in registers, 38 /// returning the new value. 39 Value *buildAtomicRMWValue(AtomicRMWInst::BinOp Op, IRBuilderBase &Builder, 40 Value *Loaded, Value *Val); 41 } 42 43 #endif // LLVM_TRANSFORMS_UTILS_LOWERATOMIC_H 44