LLVM  8.0.0svn
Float2Int.h
Go to the documentation of this file.
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 
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 class Float2IntPass : public PassInfoMixin<Float2IntPass> {
26 public:
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 
47  MapVector<Instruction *, Value *> ConvertedInsts;
48  LLVMContext *Ctx;
49 };
50 }
51 #endif // LLVM_TRANSFORMS_SCALAR_FLOAT2INT_H
Compute iterated dominance frontiers using a linear time algorithm.
Definition: AllocatorList.h:24
This class implements a map that also provides access to all stored values in a deterministic order...
Definition: MapVector.h:38
F(f)
bool runImpl(Function &F)
Definition: Float2Int.cpp:493
A CRTP mix-in to automatically provide informational APIs needed for passes.
Definition: PassManager.h:366
A set of analyses that are preserved following a run of a transformation pass.
Definition: PassManager.h:154
The instances of the Type class are immutable: once they are created, they are never changed...
Definition: Type.h:46
This is an important class for using LLVM in a threaded context.
Definition: LLVMContext.h:69
EquivalenceClasses - This represents a collection of equivalence classes and supports three efficient...
SmallPtrSet - This class implements a set which is optimized for holding SmallSize or less elements...
Definition: SmallPtrSet.h:418
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM)
Definition: Float2Int.cpp:517
This class represents a range of values.
Definition: ConstantRange.h:47
#define I(x, y, z)
Definition: MD5.cpp:58
LLVM Value Representation.
Definition: Value.h:73
A container for analyses that lazily runs them and caches their results.
This header defines various interfaces for pass management in LLVM.