indirect_memory.hh (13772:31b71dadc472) indirect_memory.hh (13963:94555f0223ba)
1/**
2 * Copyright (c) 2018 Metempsy Technology Consulting
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

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38 * (pp. 178-190). ACM.
39 */
40
41#ifndef __MEM_CACHE_PREFETCH_INDIRECT_MEMORY_HH__
42#define __MEM_CACHE_PREFETCH_INDIRECT_MEMORY_HH__
43
44#include <vector>
45
1/**
2 * Copyright (c) 2018 Metempsy Technology Consulting
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions are
7 * met: redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer;

--- 29 unchanged lines hidden (view full) ---

38 * (pp. 178-190). ACM.
39 */
40
41#ifndef __MEM_CACHE_PREFETCH_INDIRECT_MEMORY_HH__
42#define __MEM_CACHE_PREFETCH_INDIRECT_MEMORY_HH__
43
44#include <vector>
45
46#include "base/sat_counter.hh"
46#include "mem/cache/prefetch/associative_set.hh"
47#include "mem/cache/prefetch/queued.hh"
48
49struct IndirectMemoryPrefetcherParams;
50
51class IndirectMemoryPrefetcher : public QueuedPrefetcher
52{
53 /** Maximum number of prefetches generated per event */
54 const unsigned int maxPrefetchDistance;
55 /** Shift values considered */
56 const std::vector<int> shiftValues;
57 /** Counter threshold to start prefetching */
58 const unsigned int prefetchThreshold;
47#include "mem/cache/prefetch/associative_set.hh"
48#include "mem/cache/prefetch/queued.hh"
49
50struct IndirectMemoryPrefetcherParams;
51
52class IndirectMemoryPrefetcher : public QueuedPrefetcher
53{
54 /** Maximum number of prefetches generated per event */
55 const unsigned int maxPrefetchDistance;
56 /** Shift values considered */
57 const std::vector<int> shiftValues;
58 /** Counter threshold to start prefetching */
59 const unsigned int prefetchThreshold;
59 /** Maximum value of the confidence indirectCounter */
60 const unsigned int maxIndirectCounterValue;
61 /** streamCounter value to trigger the streaming prefetcher */
62 const int streamCounterThreshold;
63 /** Number of prefetches generated when using the streaming prefetcher */
64 const int streamingDistance;
65
66 /** Prefetch Table Entry */
67 struct PrefetchTableEntry : public TaggedEntry
68 {

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81 bool enabled;
82 /** Current index value */
83 int64_t index;
84 /** BaseAddr detected */
85 Addr baseAddr;
86 /** Shift detected */
87 int shift;
88 /** Confidence counter of the indirect fields */
60 /** streamCounter value to trigger the streaming prefetcher */
61 const int streamCounterThreshold;
62 /** Number of prefetches generated when using the streaming prefetcher */
63 const int streamingDistance;
64
65 /** Prefetch Table Entry */
66 struct PrefetchTableEntry : public TaggedEntry
67 {

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80 bool enabled;
81 /** Current index value */
82 int64_t index;
83 /** BaseAddr detected */
84 Addr baseAddr;
85 /** Shift detected */
86 int shift;
87 /** Confidence counter of the indirect fields */
89 int indirectCounter;
88 SatCounter indirectCounter;
90 /**
91 * This variable is set to indicate that there has been at least one
92 * match with the current index value. This information is later used
93 * when a new index is updated. If there were no increases in the
94 * indirectCounter, the counter is decremented.
95 */
96 bool increasedIndirectCounter;
97
89 /**
90 * This variable is set to indicate that there has been at least one
91 * match with the current index value. This information is later used
92 * when a new index is updated. If there were no increases in the
93 * indirectCounter, the counter is decremented.
94 */
95 bool increasedIndirectCounter;
96
98 PrefetchTableEntry() : TaggedEntry(), address(0), secure(false),
99 streamCounter(0), enabled(false), index(0), baseAddr(0), shift(0),
100 indirectCounter(0), increasedIndirectCounter(false)
97 PrefetchTableEntry(unsigned indirect_counter_bits)
98 : TaggedEntry(), address(0), secure(false), streamCounter(0),
99 enabled(false), index(0), baseAddr(0), shift(0),
100 indirectCounter(indirect_counter_bits),
101 increasedIndirectCounter(false)
101 {}
102
103 void reset() override {
104 address = 0;
105 secure = false;
106 streamCounter = 0;
107 enabled = false;
108 index = 0;
109 baseAddr = 0;
110 shift = 0;
102 {}
103
104 void reset() override {
105 address = 0;
106 secure = false;
107 streamCounter = 0;
108 enabled = false;
109 index = 0;
110 baseAddr = 0;
111 shift = 0;
111 indirectCounter = 0;
112 indirectCounter.reset();
112 increasedIndirectCounter = false;
113 }
114 };
115 /** Prefetch table */
116 AssociativeSet<PrefetchTableEntry> prefetchTable;
117
118 /** Indirect Pattern Detector entrt */
119 struct IndirectPatternDetectorEntry : public TaggedEntry

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114 }
115 };
116 /** Prefetch table */
117 AssociativeSet<PrefetchTableEntry> prefetchTable;
118
119 /** Indirect Pattern Detector entrt */
120 struct IndirectPatternDetectorEntry : public TaggedEntry

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