1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
//===- llvm/Transforms/Utils/UnrollLoop.h - Unrolling utilities -*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines some loop unrolling utilities. It does not define any
// actual pass or policy, but provides a single function to perform loop
// unrolling.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_TRANSFORMS_UTILS_UNROLLLOOP_H
#define LLVM_TRANSFORMS_UTILS_UNROLLLOOP_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Analysis/TargetTransformInfo.h"
namespace llvm {
class AssumptionCache;
class BasicBlock;
class DominatorTree;
class Loop;
class LoopInfo;
class MDNode;
class OptimizationRemarkEmitter;
class ScalarEvolution;
using NewLoopsMap = SmallDenseMap<const Loop *, Loop *, 4>;
const Loop* addClonedBlockToLoopInfo(BasicBlock *OriginalBB,
BasicBlock *ClonedBB, LoopInfo *LI,
NewLoopsMap &NewLoops);
/// Represents the result of a \c UnrollLoop invocation.
enum class LoopUnrollResult {
/// The loop was not modified.
Unmodified,
/// The loop was partially unrolled -- we still have a loop, but with a
/// smaller trip count. We may also have emitted epilogue loop if the loop
/// had a non-constant trip count.
PartiallyUnrolled,
/// The loop was fully unrolled into straight-line code. We no longer have
/// any back-edges.
FullyUnrolled
};
LoopUnrollResult UnrollLoop(Loop *L, unsigned Count, unsigned TripCount,
bool Force, bool AllowRuntime,
bool AllowExpensiveTripCount, bool PreserveCondBr,
bool PreserveOnlyFirst, unsigned TripMultiple,
unsigned PeelCount, bool UnrollRemainder,
LoopInfo *LI, ScalarEvolution *SE,
DominatorTree *DT, AssumptionCache *AC,
OptimizationRemarkEmitter *ORE, bool PreserveLCSSA);
bool UnrollRuntimeLoopRemainder(Loop *L, unsigned Count,
bool AllowExpensiveTripCount,
bool UseEpilogRemainder, bool UnrollRemainder,
LoopInfo *LI,
ScalarEvolution *SE, DominatorTree *DT,
AssumptionCache *AC,
bool PreserveLCSSA);
void computePeelCount(Loop *L, unsigned LoopSize,
TargetTransformInfo::UnrollingPreferences &UP,
unsigned &TripCount);
bool peelLoop(Loop *L, unsigned PeelCount, LoopInfo *LI, ScalarEvolution *SE,
DominatorTree *DT, AssumptionCache *AC, bool PreserveLCSSA);
MDNode *GetUnrollMetadata(MDNode *LoopID, StringRef Name);
} // end namespace llvm
#endif // LLVM_TRANSFORMS_UTILS_UNROLLLOOP_H
|
