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
23namespace llvm {
24class DominatorTree;
25class Function;
26class Instruction;
27class LLVMContext;
28class Type;
29class Value;
30
31class Float2IntPass : public PassInfoMixin<Float2IntPass> {
32public:
33 PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
34
35 // Glue for old PM.
36 bool runImpl(Function &F, const DominatorTree &DT);
37
38private:
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

source code of llvm/include/llvm/Transforms/Scalar/Float2Int.h