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Optimize extendIntervalEndTo a tiny bit by saving one call through the

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vector erase. No functionality changed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@159746 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2012-07-05 12:40:45 +00:00
parent 39c2a3d219
commit 95c88b8cb2
1 changed files with 7 additions and 7 deletions
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14
lib/CodeGen/LiveInterval.cpp
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@ -196,16 +196,16 @@ void LiveInterval::extendIntervalEndTo(Ranges::iterator I, SlotIndex NewEnd) {
// If NewEnd was in the middle of an interval, make sure to get its endpoint.
I->end = std::max(NewEnd, prior(MergeTo)->end);
// Erase any dead ranges.
ranges.erase(llvm::next(I), MergeTo);
// If the newly formed range now touches the range after it and if they have
// the same value number, merge the two ranges into one range.
Ranges::iterator Next = llvm::next(I);
if (Next != ranges.end() && Next->start <= I->end && Next->valno == ValNo) {
I->end = Next->end;
ranges.erase(Next);
if (MergeTo != ranges.end() && MergeTo->start <= I->end &&
MergeTo->valno == ValNo) {
I->end = MergeTo->end;
++MergeTo;
}
// Erase any dead ranges.
ranges.erase(llvm::next(I), MergeTo);
}