Float2Int.h revision 360784 
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
24namespace llvm {
25class Float2IntPass : public PassInfoMixin<Float2IntPass> {
26public:
27  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
28
29  // Glue for old PM.
30  bool runImpl(Function &F, const DominatorTree &DT);
31
32private:
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