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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.

llvm-svn: 15156
This commit is contained in:
Chris Lattner 2004-07-24 03:41:50 +00:00
parent c51866a20e
commit d9bbbb8484
1 changed files with 9 additions and 0 deletions
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9
llvm/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;