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Move a DenseMap's declaration outside of a loop, and just call 

clear() on each iteration. This avoids allocating and deallocating
all of DenseMap's memory on each iteration.

llvm-svn: 52642
This commit is contained in:
Dan Gohman 2008-06-23 21:15:00 +00:00
parent 29a8220501
commit fa63cc4e91
1 changed files with 2 additions and 1 deletions
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3
llvm/lib/CodeGen/SelectionDAG/ScheduleDAGRRList.cpp
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@ -953,10 +953,11 @@ void ScheduleDAGRRList::ListScheduleBottomUp() {
// While Available queue is not empty, grab the node with the highest // While Available queue is not empty, grab the node with the highest
// priority. If it is not ready put it back. Schedule the node. // priority. If it is not ready put it back. Schedule the node.
SmallVector<SUnit*, 4> NotReady; SmallVector<SUnit*, 4> NotReady;
DenseMap<SUnit*, SmallVector<unsigned, 4> > LRegsMap;
Sequence.reserve(SUnits.size()); Sequence.reserve(SUnits.size());
while (!AvailableQueue->empty()) { while (!AvailableQueue->empty()) {
bool Delayed = false; bool Delayed = false;
DenseMap<SUnit*, SmallVector<unsigned, 4> > LRegsMap; LRegsMap.clear();
SUnit *CurSU = AvailableQueue->pop(); SUnit *CurSU = AvailableQueue->pop();
while (CurSU) { while (CurSU) {
if (CurSU->CycleBound <= CurCycle) { if (CurSU->CycleBound <= CurCycle) {