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MachineScheduler: add some book-keeping to fix an assert.

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Fixe for Bug 20057 - Assertion failied in llvm::SUnit* llvm::SchedBoundary::pickOnlyChoice(): Assertion `i <= (HazardRec->getMaxLookAhead() + MaxObservedStall) && "permanent hazard"'

Thanks to Chad for the test case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211865 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2014-06-27 04:57:05 +00:00
parent 9fc1a6ffb7
commit e8f8db1c5a
2 changed files with 57 additions and 1 deletions
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8
lib/CodeGen/MachineScheduler.cpp
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@ -1687,8 +1687,14 @@ bool SchedBoundary::checkHazard(SUnit *SU) {
for (TargetSchedModel::ProcResIter
PI = SchedModel->getWriteProcResBegin(SC),
PE = SchedModel->getWriteProcResEnd(SC); PI != PE; ++PI) {
if (getNextResourceCycle(PI->ProcResourceIdx, PI->Cycles) > CurrCycle)
unsigned NRCycle = getNextResourceCycle(PI->ProcResourceIdx, PI->Cycles);
if (NRCycle > CurrCycle) {
MaxObservedStall = std::max(NRCycle - CurrCycle, MaxObservedStall);
DEBUG(dbgs() << " SU(" << SU->NodeNum << ") "
<< SchedModel->getResourceName(PI->ProcResourceIdx)
<< "=" << NRCycle << "c\n");
return true;
}
}
}
return false;