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 template <typename T> class Optional; 29 class Type; 30 class Value; 31 32 class Float2IntPass : public PassInfoMixin<Float2IntPass> { 33 public: 34 PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM); 35 36 // Glue for old PM. 37 bool runImpl(Function &F, const DominatorTree &DT); 38 39 private: 40 void findRoots(Function &F, const DominatorTree &DT); 41 void seen(Instruction *I, ConstantRange R); 42 ConstantRange badRange(); 43 ConstantRange unknownRange(); 44 ConstantRange validateRange(ConstantRange R); 45 Optional<ConstantRange> calcRange(Instruction *I); 46 void walkBackwards(); 47 void walkForwards(); 48 bool validateAndTransform(); 49 Value *convert(Instruction *I, Type *ToTy); 50 void cleanup(); 51 52 MapVector<Instruction *, ConstantRange> SeenInsts; 53 SmallSetVector<Instruction *, 8> Roots; 54 EquivalenceClasses<Instruction *> ECs; 55 MapVector<Instruction *, Value *> ConvertedInsts; 56 LLVMContext *Ctx; 57 }; 58 } 59 #endif // LLVM_TRANSFORMS_SCALAR_FLOAT2INT_H 60