mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-23 11:13:28 +01:00
076a6683eb
We've been running doxygen with the autobrief option for a couple of years now. This makes the \brief markers into our comments redundant. Since they are a visual distraction and we don't want to encourage more \brief markers in new code either, this patch removes them all. Patch produced by for i in $(git grep -l '\\brief'); do perl -pi -e 's/\\brief //g' $i & done Differential Revision: https://reviews.llvm.org/D46290 llvm-svn: 331272
109 lines
4.7 KiB
C++
109 lines
4.7 KiB
C++
//===- lib/CodeGen/CalcSpillWeights.h ---------------------------*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_CODEGEN_CALCSPILLWEIGHTS_H
|
|
#define LLVM_CODEGEN_CALCSPILLWEIGHTS_H
|
|
|
|
#include "llvm/ADT/DenseMap.h"
|
|
#include "llvm/CodeGen/SlotIndexes.h"
|
|
|
|
namespace llvm {
|
|
|
|
class LiveInterval;
|
|
class LiveIntervals;
|
|
class MachineBlockFrequencyInfo;
|
|
class MachineFunction;
|
|
class MachineLoopInfo;
|
|
class VirtRegMap;
|
|
|
|
/// Normalize the spill weight of a live interval
|
|
///
|
|
/// The spill weight of a live interval is computed as:
|
|
///
|
|
/// (sum(use freq) + sum(def freq)) / (K + size)
|
|
///
|
|
/// @param UseDefFreq Expected number of executed use and def instructions
|
|
/// per function call. Derived from block frequencies.
|
|
/// @param Size Size of live interval as returnexd by getSize()
|
|
/// @param NumInstr Number of instructions using this live interval
|
|
static inline float normalizeSpillWeight(float UseDefFreq, unsigned Size,
|
|
unsigned NumInstr) {
|
|
// The constant 25 instructions is added to avoid depending too much on
|
|
// accidental SlotIndex gaps for small intervals. The effect is that small
|
|
// intervals have a spill weight that is mostly proportional to the number
|
|
// of uses, while large intervals get a spill weight that is closer to a use
|
|
// density.
|
|
return UseDefFreq / (Size + 25*SlotIndex::InstrDist);
|
|
}
|
|
|
|
/// Calculate auxiliary information for a virtual register such as its
|
|
/// spill weight and allocation hint.
|
|
class VirtRegAuxInfo {
|
|
public:
|
|
using NormalizingFn = float (*)(float, unsigned, unsigned);
|
|
|
|
private:
|
|
MachineFunction &MF;
|
|
LiveIntervals &LIS;
|
|
VirtRegMap *VRM;
|
|
const MachineLoopInfo &Loops;
|
|
const MachineBlockFrequencyInfo &MBFI;
|
|
DenseMap<unsigned, float> Hint;
|
|
NormalizingFn normalize;
|
|
|
|
public:
|
|
VirtRegAuxInfo(MachineFunction &mf, LiveIntervals &lis,
|
|
VirtRegMap *vrm, const MachineLoopInfo &loops,
|
|
const MachineBlockFrequencyInfo &mbfi,
|
|
NormalizingFn norm = normalizeSpillWeight)
|
|
: MF(mf), LIS(lis), VRM(vrm), Loops(loops), MBFI(mbfi), normalize(norm) {}
|
|
|
|
/// (re)compute li's spill weight and allocation hint.
|
|
void calculateSpillWeightAndHint(LiveInterval &li);
|
|
|
|
/// Compute future expected spill weight of a split artifact of li
|
|
/// that will span between start and end slot indexes.
|
|
/// \param li The live interval to be split.
|
|
/// \param start The expected begining of the split artifact. Instructions
|
|
/// before start will not affect the weight.
|
|
/// \param end The expected end of the split artifact. Instructions
|
|
/// after end will not affect the weight.
|
|
/// \return The expected spill weight of the split artifact. Returns
|
|
/// negative weight for unspillable li.
|
|
float futureWeight(LiveInterval &li, SlotIndex start, SlotIndex end);
|
|
|
|
/// Helper function for weight calculations.
|
|
/// (Re)compute li's spill weight and allocation hint, or, for non null
|
|
/// start and end - compute future expected spill weight of a split
|
|
/// artifact of li that will span between start and end slot indexes.
|
|
/// \param li The live interval for which to compute the weight.
|
|
/// \param start The expected begining of the split artifact. Instructions
|
|
/// before start will not affect the weight. Relevant for
|
|
/// weight calculation of future split artifact.
|
|
/// \param end The expected end of the split artifact. Instructions
|
|
/// after end will not affect the weight. Relevant for
|
|
/// weight calculation of future split artifact.
|
|
/// \return The spill weight. Returns negative weight for unspillable li.
|
|
float weightCalcHelper(LiveInterval &li, SlotIndex *start = nullptr,
|
|
SlotIndex *end = nullptr);
|
|
};
|
|
|
|
/// Compute spill weights and allocation hints for all virtual register
|
|
/// live intervals.
|
|
void calculateSpillWeightsAndHints(LiveIntervals &LIS, MachineFunction &MF,
|
|
VirtRegMap *VRM,
|
|
const MachineLoopInfo &MLI,
|
|
const MachineBlockFrequencyInfo &MBFI,
|
|
VirtRegAuxInfo::NormalizingFn norm =
|
|
normalizeSpillWeight);
|
|
|
|
} // end namespace llvm
|
|
|
|
#endif // LLVM_CODEGEN_CALCSPILLWEIGHTS_H
|