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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.  
  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 *Val);
  35. }
  36.  
  37. #endif // LLVM_TRANSFORMS_UTILS_LOWERATOMIC_H
  38.