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[SwitchLowering] Remove incoming values in the reverse order

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- To prevent invalidating *successive* indices.
 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@232510 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael Liao
2015-03-17 18:03:10 +00:00
parent 5a6068638e
commit de3983775e
2 changed files with 140 additions and 1 deletions
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7
lib/Transforms/Utils/LowerSwitch.cpp
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@@ -175,11 +175,16 @@ static void fixPhis(BasicBlock *SuccBB, BasicBlock *OrigBB, BasicBlock *NewBB,
// Remove additional occurences coming from condensed cases and keep the
// number of incoming values equal to the number of branches to SuccBB.
SmallVector<unsigned, 8> Indices;
for (++Idx; LocalNumMergedCases > 0 && Idx < E; ++Idx)
if (PN->getIncomingBlock(Idx) == OrigBB) {
PN->removeIncomingValue(Idx);
Indices.push_back(Idx);
LocalNumMergedCases--;
}
// Remove incoming values in the reverse order to prevent invalidating
// *successive* index.
for (auto III = Indices.rbegin(), IIE = Indices.rend(); III != IIE; ++III)
PN->removeIncomingValue(*III);
}
}