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In the joiner, merge the small interval into the large interval. This restores

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us back to taking about 10.5s on gcc, instead of taking 15.6s!  The net result
is that my big patches have hand no significant effect on compile time or code
quality.  heh.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15156 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-07-24 03:41:50 +00:00
parent 4df98e546d
commit deb9971061
1 changed files with 9 additions and 0 deletions
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9
lib/CodeGen/LiveInterval.cpp
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@ -260,6 +260,15 @@ void LiveInterval::join(LiveInterval &Other, unsigned CopyIdx) {
unsigned MergedSrcValIdx = SourceLR->ValId;
unsigned MergedDstValIdx = DestLR->ValId;
// Try to do the least amount of work possible. In particular, if there are
// more liverange chunks in the other set than there are in the 'this' set,
// swap sets to merge the fewest chunks in possible.
if (Other.ranges.size() > ranges.size()) {
std::swap(MergedSrcValIdx, MergedDstValIdx);
std::swap(ranges, Other.ranges);
std::swap(NumValues, Other.NumValues);
}
// Join the ranges of other into the ranges of this interval.
Ranges::iterator InsertPos = ranges.begin();
std::map<unsigned, unsigned> Dst2SrcIdxMap;