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MI Sched fix: assert "Disconnected LRG within the scheduling region."

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187435 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2013-07-30 19:59:08 +00:00
parent 8717679c44
commit 1e46fcd989
2 changed files with 60 additions and 1 deletions
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6
lib/CodeGen/MachineScheduler.cpp
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@ -1017,6 +1017,12 @@ void CopyConstrain::constrainLocalCopy(SUnit *CopySU, ScheduleDAGMI *DAG) {
GlobalSegment->start)) {
return;
}
// If the prior global segment may be defined by the same two-address
// instruction that also defines LocalLI, then can't make a hole here.
if (SlotIndex::isSameInstr(llvm::prior(GlobalSegment)->start,
LocalLI->beginIndex())) {
return;
}
// If GlobalLI has a prior segment, it must be live into the EBB. Otherwise
// it would be a disconnected component in the live range.
assert(llvm::prior(GlobalSegment)->start < LocalLI->beginIndex() &&