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Change implementation of LiveIntervals::overlap(). This results in a

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30-50% decrease in running time of the linear scan register allocator.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10707 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alkis Evlogimenos 2004-01-07 01:45:58 +00:00
parent f6608ddf44
commit 80b378cf7c
1 changed files with 22 additions and 10 deletions
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32
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -386,17 +386,29 @@ bool LiveIntervals::Interval::liveAt(unsigned index) const
bool LiveIntervals::Interval::overlaps(const Interval& other) const
{
std::vector<bool> bitMap(end(), false);
for (Ranges::const_iterator r = ranges.begin(); r != ranges.end(); ++r) {
for (unsigned i = r->first; i < r->second; ++i)
bitMap[i] = true;
}
for (Ranges::const_iterator r = other.ranges.begin();
r != other.ranges.end(); ++r) {
for (unsigned i = r->first;
i < r->second && i < bitMap.size(); ++i)
if (bitMap[i])
Ranges::const_iterator i = ranges.begin();
Ranges::const_iterator j = other.ranges.begin();
while (i != ranges.end() && j != other.ranges.end()) {
if (i->first < j->first) {
if (i->second > j->first) {
return true;
}
else {
++i;
}
}
else if (j->first < i->first) {
if (j->second > i->first) {
return true;
}
else {
++j;
}
}
else {
return true;
}
}
return false;