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[SwitchLowering] Handle destinations on multiple phi instructions

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Follow up from r222926. Also handle multiple destinations from merged
cases on multiple and subsequent phi instructions.

rdar://problem/19106978

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223135 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bruno Cardoso Lopes
2014-12-02 18:31:53 +00:00
parent 88d2b5812a
commit 495e547ef9
2 changed files with 5 additions and 2 deletions
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5
lib/Transforms/Utils/LowerSwitch.cpp
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@ -149,6 +149,7 @@ static void fixPhis(BasicBlock *SuccBB, BasicBlock *OrigBB, BasicBlock *NewBB,
// Only update the first occurence.
unsigned Idx = 0, E = PN->getNumIncomingValues();
unsigned LocalNumMergedCases = NumMergedCases;
for (; Idx != E; ++Idx) {
if (PN->getIncomingBlock(Idx) == OrigBB) {
PN->setIncomingBlock(Idx, NewBB);
@ -158,10 +159,10 @@ 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.
for (++Idx; NumMergedCases > 0 && Idx != E; ++Idx)
for (++Idx; LocalNumMergedCases > 0 && Idx < E; ++Idx)
if (PN->getIncomingBlock(Idx) == OrigBB) {
PN->removeIncomingValue(Idx);
NumMergedCases--;
LocalNumMergedCases--;
}
}
}