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Properly deal with empty intervals when checking for interference.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@121319 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2010-12-08 23:51:35 +00:00
parent 045869c12a
commit 9b0c4f8af3
2 changed files with 3 additions and 1 deletions
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3
lib/CodeGen/LiveIntervalUnion.cpp
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@ -111,9 +111,10 @@ void LiveIntervalUnion::verify(LiveVirtRegBitSet& VisitedVRegs) {
// Assumes that segments are sorted by start position in both
// LiveInterval and LiveSegments.
void LiveIntervalUnion::Query::findIntersection(InterferenceResult &IR) const {
// Search until reaching the end of the LiveUnion segments.
LiveInterval::iterator VirtRegEnd = VirtReg->end();
if (IR.VirtRegI == VirtRegEnd)
return;
while (IR.LiveUnionI.valid()) {
// Slowly advance the live virtual reg iterator until we surpass the next
// segment in LiveUnion.

1
lib/CodeGen/RegAllocGreedy.cpp
View File

@ -173,6 +173,7 @@ unsigned RAGreedy::selectOrSplit(LiveInterval &VirtReg,
// Found an available register.
return PhysReg;
}
assert(!VirtReg.empty() && "Empty VirtReg has interference");
LiveInterval *interferingVirtReg =
Queries[interfReg].firstInterference().liveUnionPos().value();