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Reuse unused val#'s to avoid running out of memory in extreme cases.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70069 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2009-04-25 20:20:15 +00:00
parent 11d8fb9609
commit a4b2bab233
1 changed files with 5 additions and 1 deletions
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6
lib/CodeGen/LiveInterval.cpp
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@ -577,6 +577,7 @@ void LiveInterval::MergeInClobberRanges(const LiveInterval &Clobbers,
if (Clobbers.empty()) return;
DenseMap<VNInfo*, VNInfo*> ValNoMaps;
VNInfo *UnusedValNo = 0;
iterator IP = begin();
for (const_iterator I = Clobbers.begin(), E = Clobbers.end(); I != E; ++I) {
// For every val# in the Clobbers interval, create a new "unknown" val#.
@ -584,8 +585,10 @@ void LiveInterval::MergeInClobberRanges(const LiveInterval &Clobbers,
DenseMap<VNInfo*, VNInfo*>::iterator VI = ValNoMaps.find(I->valno);
if (VI != ValNoMaps.end())
ClobberValNo = VI->second;
else if (UnusedValNo)
ClobberValNo = UnusedValNo;
else {
ClobberValNo = getNextValue(~0U, 0, VNInfoAllocator);
UnusedValNo = ClobberValNo = getNextValue(~0U, 0, VNInfoAllocator);
ValNoMaps.insert(std::make_pair(I->valno, ClobberValNo));
}
@ -623,6 +626,7 @@ void LiveInterval::MergeInClobberRanges(const LiveInterval &Clobbers,
// Insert the clobber interval.
IP = addRangeFrom(LiveRange(SubRangeStart, SubRangeEnd, ClobberValNo),
IP);
UnusedValNo = 0;
}
}
}