6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2024-12-14 11:32:34 +00:00
Code Issues Projects Releases Wiki Activity

Use reverse iterators when updating the vector, since scanning from

Browse Source 
the end will reduce erase() runtimes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15093 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alkis Evlogimenos 2004-07-22 02:16:53 +00:00
parent 6beef3e1a0
commit 10e169b038
1 changed files with 14 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
lib/CodeGen/RegAllocIterativeScan.cpp
View File

@ -230,20 +230,21 @@ bool RA::linearScan()
}
// 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::initIntervalSets(LiveIntervals::Intervals& li)
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 @@ void RA::processActiveIntervals(IntervalPtrs::value_type cur)
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 @@ void RA::processActiveIntervals(IntervalPtrs::value_type cur)
// 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::processActiveIntervals(IntervalPtrs::value_type cur)
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 @@ void RA::processInactiveIntervals(IntervalPtrs::value_type cur)
// 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;