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  1. //===-- Float2Int.h - Demote floating point ops to work on integers -------===//
  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. //
  9. // This file provides the Float2Int pass, which aims to demote floating
  10. // point operations to work on integers, where that is losslessly possible.
  11. //
  12. //===----------------------------------------------------------------------===//
  13.  
  14. #ifndef LLVM_TRANSFORMS_SCALAR_FLOAT2INT_H
  15. #define LLVM_TRANSFORMS_SCALAR_FLOAT2INT_H
  16.  
  17. #include "llvm/ADT/EquivalenceClasses.h"
  18. #include "llvm/ADT/MapVector.h"
  19. #include "llvm/ADT/SetVector.h"
  20. #include "llvm/IR/ConstantRange.h"
  21. #include "llvm/IR/PassManager.h"
  22.  
  23. namespace llvm {
  24. class DominatorTree;
  25. class Function;
  26. class Instruction;
  27. class LLVMContext;
  28. class Type;
  29. class Value;
  30.  
  31. class Float2IntPass : public PassInfoMixin<Float2IntPass> {
  32. public:
  33.   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
  34.  
  35.   // Glue for old PM.
  36.   bool runImpl(Function &F, const DominatorTree &DT);
  37.  
  38. private:
  39.   void findRoots(Function &F, const DominatorTree &DT);
  40.   void seen(Instruction *I, ConstantRange R);
  41.   ConstantRange badRange();
  42.   ConstantRange unknownRange();
  43.   ConstantRange validateRange(ConstantRange R);
  44.   std::optional<ConstantRange> calcRange(Instruction *I);
  45.   void walkBackwards();
  46.   void walkForwards();
  47.   bool validateAndTransform();
  48.   Value *convert(Instruction *I, Type *ToTy);
  49.   void cleanup();
  50.  
  51.   MapVector<Instruction *, ConstantRange> SeenInsts;
  52.   SmallSetVector<Instruction *, 8> Roots;
  53.   EquivalenceClasses<Instruction *> ECs;
  54.   MapVector<Instruction *, Value *> ConvertedInsts;
  55.   LLVMContext *Ctx;
  56. };
  57. }
  58. #endif // LLVM_TRANSFORMS_SCALAR_FLOAT2INT_H
  59.