Coverage Report

Created: 2017-10-03 07:32

/Users/buildslave/jenkins/sharedspace/clang-stage2-coverage-R@2/llvm/include/llvm/CodeGen/CalcSpillWeights.h
Line
Count
Source
1
//===---------------- lib/CodeGen/CalcSpillWeights.h ------------*- C++ -*-===//
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
11
#ifndef LLVM_CODEGEN_CALCSPILLWEIGHTS_H
12
#define LLVM_CODEGEN_CALCSPILLWEIGHTS_H
13
14
#include "llvm/ADT/DenseMap.h"
15
#include "llvm/CodeGen/SlotIndexes.h"
16
17
namespace llvm {
18
19
  class LiveInterval;
20
  class LiveIntervals;
21
  class MachineBlockFrequencyInfo;
22
  class MachineLoopInfo;
23
  class VirtRegMap;
24
25
  /// \brief Normalize the spill weight of a live interval
26
  ///
27
  /// The spill weight of a live interval is computed as:
28
  ///
29
  ///   (sum(use freq) + sum(def freq)) / (K + size)
30
  ///
31
  /// @param UseDefFreq Expected number of executed use and def instructions
32
  ///                   per function call. Derived from block frequencies.
33
  /// @param Size       Size of live interval as returnexd by getSize()
34
  /// @param NumInstr   Number of instructions using this live interval
35
  ///
36
  static inline float normalizeSpillWeight(float UseDefFreq, unsigned Size,
37
7.94M
                                           unsigned NumInstr) {
38
7.94M
    // The constant 25 instructions is added to avoid depending too much on
39
7.94M
    // accidental SlotIndex gaps for small intervals. The effect is that small
40
7.94M
    // intervals have a spill weight that is mostly proportional to the number
41
7.94M
    // of uses, while large intervals get a spill weight that is closer to a use
42
7.94M
    // density.
43
7.94M
    return UseDefFreq / (Size + 25*SlotIndex::InstrDist);
44
7.94M
  }
Unexecuted instantiation: CalcSpillWeights.cpp:llvm::normalizeSpillWeight(float, unsigned int, unsigned int)
LiveRangeEdit.cpp:llvm::normalizeSpillWeight(float, unsigned int, unsigned int)
Line
Count
Source
37
315k
                                           unsigned NumInstr) {
38
315k
    // The constant 25 instructions is added to avoid depending too much on
39
315k
    // accidental SlotIndex gaps for small intervals. The effect is that small
40
315k
    // intervals have a spill weight that is mostly proportional to the number
41
315k
    // of uses, while large intervals get a spill weight that is closer to a use
42
315k
    // density.
43
315k
    return UseDefFreq / (Size + 25*SlotIndex::InstrDist);
44
315k
  }
RegAllocBasic.cpp:llvm::normalizeSpillWeight(float, unsigned int, unsigned int)
Line
Count
Source
37
1.47k
                                           unsigned NumInstr) {
38
1.47k
    // The constant 25 instructions is added to avoid depending too much on
39
1.47k
    // accidental SlotIndex gaps for small intervals. The effect is that small
40
1.47k
    // intervals have a spill weight that is mostly proportional to the number
41
1.47k
    // of uses, while large intervals get a spill weight that is closer to a use
42
1.47k
    // density.
43
1.47k
    return UseDefFreq / (Size + 25*SlotIndex::InstrDist);
44
1.47k
  }
RegAllocGreedy.cpp:llvm::normalizeSpillWeight(float, unsigned int, unsigned int)
Line
Count
Source
37
7.62M
                                           unsigned NumInstr) {
38
7.62M
    // The constant 25 instructions is added to avoid depending too much on
39
7.62M
    // accidental SlotIndex gaps for small intervals. The effect is that small
40
7.62M
    // intervals have a spill weight that is mostly proportional to the number
41
7.62M
    // of uses, while large intervals get a spill weight that is closer to a use
42
7.62M
    // density.
43
7.62M
    return UseDefFreq / (Size + 25*SlotIndex::InstrDist);
44
7.62M
  }
RegAllocPBQP.cpp:llvm::normalizeSpillWeight(float, unsigned int, unsigned int)
Line
Count
Source
37
134
                                           unsigned NumInstr) {
38
134
    // The constant 25 instructions is added to avoid depending too much on
39
134
    // accidental SlotIndex gaps for small intervals. The effect is that small
40
134
    // intervals have a spill weight that is mostly proportional to the number
41
134
    // of uses, while large intervals get a spill weight that is closer to a use
42
134
    // density.
43
134
    return UseDefFreq / (Size + 25*SlotIndex::InstrDist);
44
134
  }
45
46
  /// \brief Calculate auxiliary information for a virtual register such as its
47
  /// spill weight and allocation hint.
48
  class VirtRegAuxInfo {
49
  public:
50
    typedef float (*NormalizingFn)(float, unsigned, unsigned);
51
52
  private:
53
    MachineFunction &MF;
54
    LiveIntervals &LIS;
55
    VirtRegMap *VRM;
56
    const MachineLoopInfo &Loops;
57
    const MachineBlockFrequencyInfo &MBFI;
58
    DenseMap<unsigned, float> Hint;
59
    NormalizingFn normalize;
60
61
  public:
62
    VirtRegAuxInfo(MachineFunction &mf, LiveIntervals &lis,
63
                   VirtRegMap *vrm, const MachineLoopInfo &loops,
64
                   const MachineBlockFrequencyInfo &mbfi,
65
                   NormalizingFn norm = normalizeSpillWeight)
66
997k
        : MF(mf), LIS(lis), VRM(vrm), Loops(loops), MBFI(mbfi), normalize(norm) {}
67
68
    /// \brief (re)compute li's spill weight and allocation hint.
69
    void calculateSpillWeightAndHint(LiveInterval &li);
70
  };
71
72
  /// \brief Compute spill weights and allocation hints for all virtual register
73
  /// live intervals.
74
  void calculateSpillWeightsAndHints(LiveIntervals &LIS, MachineFunction &MF,
75
                                     VirtRegMap *VRM,
76
                                     const MachineLoopInfo &MLI,
77
                                     const MachineBlockFrequencyInfo &MBFI,
78
                                     VirtRegAuxInfo::NormalizingFn norm =
79
                                         normalizeSpillWeight);
80
}
81
82
#endif // LLVM_CODEGEN_CALCSPILLWEIGHTS_H