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1 : //===-- Float2Int.h - Demote floating point ops to work on integers -------===//
2 : //
3 : // The LLVM Compiler Infrastructure
4 : //
5 : // This file is distributed under the University of Illinois Open Source
6 : // License. See LICENSE.TXT for details.
7 : //
8 : //===----------------------------------------------------------------------===//
9 : //
10 : // This file provides the Float2Int pass, which aims to demote floating
11 : // point operations to work on integers, where that is losslessly possible.
12 : //
13 : //===----------------------------------------------------------------------===//
14 :
15 : #ifndef LLVM_TRANSFORMS_SCALAR_FLOAT2INT_H
16 : #define LLVM_TRANSFORMS_SCALAR_FLOAT2INT_H
17 :
18 : #include "llvm/ADT/EquivalenceClasses.h"
19 : #include "llvm/ADT/MapVector.h"
20 : #include "llvm/IR/ConstantRange.h"
21 : #include "llvm/IR/Function.h"
22 : #include "llvm/IR/PassManager.h"
23 :
24 : namespace llvm {
25 4798 : 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);
31 :
32 : private:
33 : void findRoots(Function &F, SmallPtrSet<Instruction *, 8> &Roots);
34 : void seen(Instruction *I, ConstantRange R);
35 : ConstantRange badRange();
36 : ConstantRange unknownRange();
37 : ConstantRange validateRange(ConstantRange R);
38 : void walkBackwards(const SmallPtrSetImpl<Instruction *> &Roots);
39 : void walkForwards();
40 : bool validateAndTransform();
41 : Value *convert(Instruction *I, Type *ToTy);
42 : void cleanup();
43 :
44 : MapVector<Instruction *, ConstantRange> SeenInsts;
45 : SmallPtrSet<Instruction *, 8> Roots;
46 : EquivalenceClasses<Instruction *> ECs;
47 : MapVector<Instruction *, Value *> ConvertedInsts;
48 : LLVMContext *Ctx;
49 : };
50 : }
51 : #endif // LLVM_TRANSFORMS_SCALAR_FLOAT2INT_H
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