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/IR/ConstantRange.h" 20 #include "llvm/IR/Dominators.h" 21 #include "llvm/IR/Function.h" 22 #include "llvm/IR/PassManager.h" 23 24 namespace llvm { 25 class Float2IntPass : public PassInfoMixin<Float2IntPass> { 26 public: 27 PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM); 28 29 // Glue for old PM. 30 bool runImpl(Function &F, const DominatorTree &DT); 31 32 private: 33 void findRoots(Function &F, const DominatorTree &DT, 34 SmallPtrSet<Instruction *, 8> &Roots); 35 void seen(Instruction *I, ConstantRange R); 36 ConstantRange badRange(); 37 ConstantRange unknownRange(); 38 ConstantRange validateRange(ConstantRange R); 39 void walkBackwards(const SmallPtrSetImpl<Instruction *> &Roots); 40 void walkForwards(); 41 bool validateAndTransform(); 42 Value *convert(Instruction *I, Type *ToTy); 43 void cleanup(); 44 45 MapVector<Instruction *, ConstantRange> SeenInsts; 46 SmallPtrSet<Instruction *, 8> Roots; 47 EquivalenceClasses<Instruction *> ECs; 48 MapVector<Instruction *, Value *> ConvertedInsts; 49 LLVMContext *Ctx; 50 }; 51 } 52 #endif // LLVM_TRANSFORMS_SCALAR_FLOAT2INT_H 53