-
Notifications
You must be signed in to change notification settings - Fork 1
/
perceptron_hybrid.h
51 lines (35 loc) · 1.5 KB
/
perceptron_hybrid.h
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
#ifndef _PREDICTOR_H_
#define _PREDICTOR_H_
#include "utils.h"
#include "tracer.h"
#include <bitset>
#include <stdint.h>
#define PERC_TABLE_SIZE 2048
#define GSHARE_TABLE_SIZE 131072
#define CHOICE_TABLE_SIZE 16384
#define HIST_LEN 17 // Optimal value as determined by paper
/////////////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////
class PREDICTOR{
// The state is defined for perceptron predictor.
private:
bitset<HIST_LEN> ghr; // global history register
bitset<2> choiceTable[CHOICE_TABLE_SIZE]; // saturating counters
int8_t perceptronTable[PERC_TABLE_SIZE][HIST_LEN + 1]; //table of perceptrons
UINT32 perceptronSteps; // number of training steps for each perceptron
UINT32 *pht; // pattern history table
public:
// The interface to the four functions below CAN NOT be changed
PREDICTOR(void);
bool GetPrediction(UINT32 PC);
void UpdatePredictor(UINT32 PC, bool resolveDir, bool predDir, UINT32 branchTarget);
void TrackOtherInst(UINT32 PC, OpType opType, UINT32 branchTarget);
// Contestants can define their own functions below
UINT32 HashPC(UINT32 PC, UINT32 numPerceptronEntries);
bool GetGsharePrediction(UINT32 PC);
void UpdateGsharePredictor(UINT32 PC, bool resolveDir);
bool GetPerceptronPrediction(UINT32 PC);
void UpdatePerceptronPredictor(UINT32 PC, bool resolveDir, bool predDir);
};
/***********************************************************/
#endif