LLVM  11.0.0git
Float2Int.h
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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 
18 #include "llvm/ADT/MapVector.h"
19 #include "llvm/ADT/SetVector.h"
20 #include "llvm/IR/ConstantRange.h"
21 #include "llvm/IR/Dominators.h"
22 #include "llvm/IR/Function.h"
23 #include "llvm/IR/PassManager.h"
24 
25 namespace llvm {
26 class Float2IntPass : public PassInfoMixin<Float2IntPass> {
27 public:
29 
30  // Glue for old PM.
31  bool runImpl(Function &F, const DominatorTree &DT);
32 
33 private:
34  void findRoots(Function &F, const DominatorTree &DT);
35  void seen(Instruction *I, ConstantRange R);
36  ConstantRange badRange();
37  ConstantRange unknownRange();
38  ConstantRange validateRange(ConstantRange R);
39  void walkBackwards();
40  void walkForwards();
41  bool validateAndTransform();
42  Value *convert(Instruction *I, Type *ToTy);
43  void cleanup();
44 
48  MapVector<Instruction *, Value *> ConvertedInsts;
49  LLVMContext *Ctx;
50 };
51 }
52 #endif // LLVM_TRANSFORMS_SCALAR_FLOAT2INT_H
This class represents lattice values for constants.
Definition: AllocatorList.h:23
This class implements a map that also provides access to all stored values in a deterministic order...
Definition: MapVector.h:37
F(f)
A CRTP mix-in to automatically provide informational APIs needed for passes.
Definition: PassManager.h:373
Concrete subclass of DominatorTreeBase that is used to compute a normal dominator tree...
Definition: Dominators.h:144
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:68
EquivalenceClasses - This represents a collection of equivalence classes and supports three efficient...
A SetVector that performs no allocations if smaller than a certain size.
Definition: SetVector.h:302
PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM)
Definition: Float2Int.cpp:541
This class represents a range of values.
Definition: ConstantRange.h:47
#define I(x, y, z)
Definition: MD5.cpp:59
LLVM Value Representation.
Definition: Value.h:74
bool runImpl(Function &F, const DominatorTree &DT)
Definition: Float2Int.cpp:517
A container for analyses that lazily runs them and caches their results.
This header defines various interfaces for pass management in LLVM.