[llvm-commits] CVS: llvm/lib/CodeGen/RegAllocIterativeScan.cpp
Alkis Evlogimenos
alkis at cs.uiuc.edu
Wed Jul 21 19:17:04 PDT 2004
Changes in directory llvm/lib/CodeGen:
RegAllocIterativeScan.cpp updated: 1.6 -> 1.7
---
Log message:
Use reverse iterators when updating the vector, since scanning from
the end will reduce erase() runtimes.
---
Diffs of the changes: (+14 -11)
Index: llvm/lib/CodeGen/RegAllocIterativeScan.cpp
diff -u llvm/lib/CodeGen/RegAllocIterativeScan.cpp:1.6 llvm/lib/CodeGen/RegAllocIterativeScan.cpp:1.7
--- llvm/lib/CodeGen/RegAllocIterativeScan.cpp:1.6 Wed Jul 21 15:50:33 2004
+++ llvm/lib/CodeGen/RegAllocIterativeScan.cpp Wed Jul 21 21:16:53 2004
@@ -230,20 +230,21 @@
}
// expire any remaining active intervals
- for (IntervalPtrs::iterator i = active_.begin(); i != active_.end(); ) {
+ for (IntervalPtrs::reverse_iterator
+ i = active_.rbegin(); i != active_.rend(); ) {
unsigned reg = (*i)->reg;
DEBUG(std::cerr << "\tinterval " << **i << " expired\n");
if (MRegisterInfo::isVirtualRegister(reg))
reg = vrm_->getPhys(reg);
prt_->delRegUse(reg);
- i = active_.erase(i);
+ i = IntervalPtrs::reverse_iterator(active_.erase(i.base()-1));
}
// expire any remaining inactive intervals
- for (IntervalPtrs::iterator
- i = inactive_.begin(); i != inactive_.end(); ) {
+ for (IntervalPtrs::reverse_iterator
+ i = inactive_.rbegin(); i != inactive_.rend(); ) {
DEBUG(std::cerr << "\tinterval " << **i << " expired\n");
- i = inactive_.erase(i);
+ i = IntervalPtrs::reverse_iterator(inactive_.erase(i.base()-1));
}
// return true if we spilled anything
@@ -267,7 +268,8 @@
void RA::processActiveIntervals(IntervalPtrs::value_type cur)
{
DEBUG(std::cerr << "\tprocessing active intervals:\n");
- for (IntervalPtrs::iterator i = active_.begin(); i != active_.end();) {
+ for (IntervalPtrs::reverse_iterator
+ i = active_.rbegin(); i != active_.rend();) {
unsigned reg = (*i)->reg;
// remove expired intervals
if ((*i)->expiredAt(cur->start())) {
@@ -276,7 +278,7 @@
reg = vrm_->getPhys(reg);
prt_->delRegUse(reg);
// remove from active
- i = active_.erase(i);
+ i = IntervalPtrs::reverse_iterator(active_.erase(i.base()-1));
}
// move inactive intervals to inactive list
else if (!(*i)->liveAt(cur->start())) {
@@ -287,7 +289,7 @@
// add to inactive
inactive_.push_back(*i);
// remove from active
- i = active_.erase(i);
+ i = IntervalPtrs::reverse_iterator(active_.erase(i.base()-1));
}
else {
++i;
@@ -298,14 +300,15 @@
void RA::processInactiveIntervals(IntervalPtrs::value_type cur)
{
DEBUG(std::cerr << "\tprocessing inactive intervals:\n");
- for (IntervalPtrs::iterator i = inactive_.begin(); i != inactive_.end();) {
+ for (IntervalPtrs::reverse_iterator
+ i = inactive_.rbegin(); i != inactive_.rend();) {
unsigned reg = (*i)->reg;
// remove expired intervals
if ((*i)->expiredAt(cur->start())) {
DEBUG(std::cerr << "\t\tinterval " << **i << " expired\n");
// remove from inactive
- i = inactive_.erase(i);
+ i = IntervalPtrs::reverse_iterator(inactive_.erase(i.base()-1));
}
// move re-activated intervals in active list
else if ((*i)->liveAt(cur->start())) {
@@ -316,7 +319,7 @@
// add to active
active_.push_back(*i);
// remove from inactive
- i = inactive_.erase(i);
+ i = IntervalPtrs::reverse_iterator(inactive_.erase(i.base()-1));
}
else {
++i;
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