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cxxrtl: keep the memory write queue sorted on insertion.

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Strategically inserting the pending memory write in memory::update to keep the
queue sorted allows us to skip the queue sort in memory::commit.

The Minerva SRAM SoC runs ~7% faster as a result.
This commit is contained in:
Asu 2020-04-22 20:50:13 +02:00
parent db27f2f378
commit dc77563a6a
1 changed files with 5 additions and 3 deletions
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8
backends/cxxrtl/cxxrtl.h
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@ -641,13 +641,15 @@ struct memory {
void update(size_t index, const value<Width> &val, const value<Width> &mask, int priority = 0) {
assert(index < data.size());
write_queue.emplace_back(write { index, val, mask, priority });
// Queue up the write while keeping the queue sorted by priority.
write_queue.insert(
std::upper_bound(write_queue.begin(), write_queue.end(), priority,
[](const int a, const write& b) { return a < b.priority; }),
write { index, val, mask, priority });
}
bool commit() {
bool changed = false;
std::sort(write_queue.begin(), write_queue.end(),
[](const write &a, const write &b) { return a.priority < b.priority; });
for (const write &entry : write_queue) {
value<Width> elem = data[entry.index];
elem = elem.update(entry.val, entry.mask);