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When joining two intervals where the RHS is really simple, use a light-weight

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method for joining the live ranges instead of the fully-general one.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30049 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-09-02 05:26:59 +00:00
parent 6bda49fd9f
commit f21f0205b5
2 changed files with 172 additions and 11 deletions
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17
lib/CodeGen/LiveInterval.cpp
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@@ -351,6 +351,23 @@ void LiveInterval::join(LiveInterval &Other, int *LHSValNoAssignments,
weight += Other.weight;
}
/// MergeRangesInAsValue - Merge all of the intervals in RHS into this live
/// interval as the specified value number. The LiveRanges in RHS are
/// allowed to overlap with LiveRanges in the current interval, but only if
/// the overlapping LiveRanges have the specified value number.
void LiveInterval::MergeRangesInAsValue(const LiveInterval &RHS,
unsigned LHSValNo) {
// TODO: Make this more efficient.
iterator InsertPos = begin();
for (const_iterator I = RHS.begin(), E = RHS.end(); I != E; ++I) {
// Map the ValId in the other live range to the current live range.
LiveRange Tmp = *I;
Tmp.ValId = LHSValNo;
InsertPos = addRangeFrom(Tmp, InsertPos);
}
}
/// MergeInClobberRanges - For any live ranges that are not defined in the
/// current interval, but are defined in the Clobbers interval, mark them
/// used with an unknown definition value.