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mem-cache: Rewrite explicit fully associative lookup

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The code is already assuming a fully associative cache.  Rather than
calling getPossibleEntries with a random value and therefore needlessly
passing a vector of pointers, we use the AssociativeCache iterator to
loop over the cache entries

Change-Id: Ic99cbd39ee9f12eef9091d9d62ca24d0c3e61300
Signed-off-by: Giacomo Travaglini <giacomo.travaglini@arm.com>
This commit is contained in:
Giacomo Travaglini
2024-04-12 17:18:14 +01:00
parent 1773001dd6
commit 58aa0cfbe5
1 changed files with 18 additions and 9 deletions
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27
src/mem/cache/prefetch/signature_path_v2.cc vendored
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@@ -1,4 +1,16 @@
/**
* Copyright (c) 2024 Arm Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Copyright (c) 2018 Metempsy Technology Consulting
* All rights reserved.
*
@@ -59,16 +71,13 @@ SignaturePathV2::handleSignatureTableMiss(stride_t current_block,
// This should return all entries of the GHR, since it is a fully
// associative table
std::vector<GlobalHistoryEntry *> all_ghr_entries =
globalHistoryRegister.getPossibleEntries(0 /* any value works */);
for (auto gh_entry : all_ghr_entries) {
if (gh_entry->lastBlock + gh_entry->delta == current_block) {
new_signature = gh_entry->signature;
new_conf = gh_entry->confidence;
new_stride = gh_entry->delta;
for (auto &gh_entry : globalHistoryRegister) {
if (gh_entry.lastBlock + gh_entry.delta == current_block) {
new_signature = gh_entry.signature;
new_conf = gh_entry.confidence;
new_stride = gh_entry.delta;
found = true;
globalHistoryRegister.accessEntry(gh_entry);
globalHistoryRegister.accessEntry(&gh_entry);
break;
}
}