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-rw-r--r--src/mem/cache/prefetch/stride.cc14
-rw-r--r--src/mem/cache/prefetch/stride.hh1
2 files changed, 11 insertions, 4 deletions
diff --git a/src/mem/cache/prefetch/stride.cc b/src/mem/cache/prefetch/stride.cc
index c4cf2023a..d4a31f9da 100644
--- a/src/mem/cache/prefetch/stride.cc
+++ b/src/mem/cache/prefetch/stride.cc
@@ -98,12 +98,17 @@ StridePrefetcher::calculatePrefetch(PacketPtr &pkt, std::list<Addr> &addresses,
bool stride_match = (new_stride == (*iter)->stride);
if (stride_match && new_stride != 0) {
+ (*iter)->tolerance = true;
if ((*iter)->confidence < Max_Conf)
(*iter)->confidence++;
} else {
- (*iter)->stride = new_stride;
- if ((*iter)->confidence > Min_Conf)
- (*iter)->confidence = 0;
+ if (!((*iter)->tolerance)) {
+ (*iter)->stride = new_stride;
+ if ((*iter)->confidence > Min_Conf)
+ (*iter)->confidence = 0;
+ } else {
+ (*iter)->tolerance = false;
+ }
}
DPRINTF(HWPrefetch, "hit: PC %x data_addr %x (%s) stride %d (%s), "
@@ -118,7 +123,7 @@ StridePrefetcher::calculatePrefetch(PacketPtr &pkt, std::list<Addr> &addresses,
return;
for (int d = 1; d <= degree; d++) {
- Addr new_addr = data_addr + d * new_stride;
+ Addr new_addr = data_addr + d * (*iter)->stride;
if (pageStop && !samePage(data_addr, new_addr)) {
// Spanned the page, so now stop
pfSpanPage += degree - d + 1;
@@ -160,6 +165,7 @@ StridePrefetcher::calculatePrefetch(PacketPtr &pkt, std::list<Addr> &addresses,
new_entry->isSecure = is_secure;
new_entry->stride = 0;
new_entry->confidence = 0;
+ new_entry->tolerance = false;
tab.push_back(new_entry);
}
}
diff --git a/src/mem/cache/prefetch/stride.hh b/src/mem/cache/prefetch/stride.hh
index 0e31984f9..a491eb687 100644
--- a/src/mem/cache/prefetch/stride.hh
+++ b/src/mem/cache/prefetch/stride.hh
@@ -72,6 +72,7 @@ class StridePrefetcher : public BasePrefetcher
bool isSecure;
int stride;
int confidence;
+ bool tolerance;
};
std::list<StrideEntry*> table[Max_Contexts];