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Instead, teach SimplifyCFG to trim non-address-taken blocks from

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indirectbr destination lists.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111122 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-08-16 14:41:14 +00:00
parent 9883b95a2b
commit 7a4994356b
2 changed files with 16 additions and 2 deletions
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lib/Transforms/Utils/SimplifyCFG.cpp
+3 -2
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@@ -2057,12 +2057,13 @@ bool SimplifyCFGOpt::run(BasicBlock *BB) {
return true;
}
}
} else if (IndirectBrInst *IBI = dyn_cast<IndirectBrInst>(BB->getTerminator())) {
} else if (IndirectBrInst *IBI =
dyn_cast<IndirectBrInst>(BB->getTerminator())) {
// Eliminate redundant destinations.
SmallPtrSet<Value *, 8> Succs;
for (unsigned i = 0, e = IBI->getNumDestinations(); i != e; ++i) {
BasicBlock *Dest = IBI->getDestination(i);
if (!Succs.insert(Dest)) {
if (!Dest->hasAddressTaken() || !Succs.insert(Dest)) {
Dest->removePredecessor(BB);
IBI->removeDestination(i);
--i; --e;