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Iterators folloring a SmallVector erased element are invalidated so 

don't access cached iterators from after the erased element.

llvm-svn: 49056
This commit is contained in:
David Greene 2008-04-01 22:14:23 +00:00
parent fc9f25dab0
commit 7f7edc3824
1 changed files with 4 additions and 6 deletions
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10
llvm/lib/Transforms/Scalar/LoopIndexSplit.cpp
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@ -232,8 +232,8 @@ bool LoopIndexSplit::runOnLoop(Loop *IncomingLoop, LPPassManager &LPM_Ref) {
return false;
// First see if it is possible to eliminate loop itself or not.
for (SmallVector<SplitInfo, 4>::iterator SI = SplitData.begin(),
E = SplitData.end(); SI != E;) {
for (SmallVector<SplitInfo, 4>::iterator SI = SplitData.begin();
SI != SplitData.end();) {
SplitInfo &SD = *SI;
ICmpInst *CI = dyn_cast<ICmpInst>(SD.SplitCondition);
if (SD.SplitCondition->getOpcode() == Instruction::And) {
@ -244,8 +244,7 @@ bool LoopIndexSplit::runOnLoop(Loop *IncomingLoop, LPPassManager &LPM_Ref) {
return Changed;
} else {
SmallVector<SplitInfo, 4>::iterator Delete_SI = SI;
++SI;
SplitData.erase(Delete_SI);
SI = SplitData.erase(Delete_SI);
}
}
else if (CI && CI->getPredicate() == ICmpInst::ICMP_EQ) {
@ -256,8 +255,7 @@ bool LoopIndexSplit::runOnLoop(Loop *IncomingLoop, LPPassManager &LPM_Ref) {
return Changed;
} else {
SmallVector<SplitInfo, 4>::iterator Delete_SI = SI;
++SI;
SplitData.erase(Delete_SI);
SI = SplitData.erase(Delete_SI);
}
} else
++SI;