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Update -mem2reg to use succ_iterator instead of iterating across TerminatorInst

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successors. This makes it support nounwind.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@48320 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2008-03-13 02:42:41 +00:00
parent 1c9b8cf28c
commit 6e7aeb16fa
1 changed files with 10 additions and 13 deletions
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23
lib/Transforms/Utils/PromoteMemoryToRegister.cpp
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@ -884,12 +884,10 @@ NextIteration:
// operands so far. Remember this count.
unsigned NewPHINumOperands = APN->getNumOperands();
TerminatorInst *PredTerm = Pred->getTerminator();
unsigned NumEdges = 0;
for (unsigned i = 0, e = PredTerm->getNumSuccessors(); i != e; ++i) {
if (PredTerm->getSuccessor(i) == BB)
for (succ_iterator I = succ_begin(Pred), E = succ_end(Pred); I != E; ++I)
if (*I == BB)
++NumEdges;
}
assert(NumEdges && "Must be at least one edge from Pred to BB!");
// Add entries for all the phis.
@ -952,18 +950,17 @@ NextIteration:
}
// 'Recurse' to our successors.
TerminatorInst *TI = BB->getTerminator();
unsigned NumSuccs = TI->getNumSuccessors();
if (NumSuccs == 0) return;
// Add all-but-one successor to the worklist.
for (unsigned i = 0; i != NumSuccs-1; i++)
Worklist.push_back(RenamePassData(TI->getSuccessor(i), BB, IncomingVals));
succ_iterator I = succ_begin(BB), E = succ_end(BB);
if (I == E) return;
// Handle the last successor without using the worklist. This allows us to
// handle unconditional branches directly, for example.
--E;
for (; I != E; ++I)
Worklist.push_back(RenamePassData(*I, BB, IncomingVals));
Pred = BB;
BB = TI->getSuccessor(NumSuccs-1);
BB = *I;
goto NextIteration;
}