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Do not add unreachable code to a natural loop! 

llvm-svn: 9377
This commit is contained in:
Chris Lattner 2003-10-22 16:41:21 +00:00
parent aa81dce20c
commit ac4238f7bc
1 changed files with 4 additions and 1 deletions
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5
llvm/lib/Analysis/LoopInfo.cpp
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@ -151,11 +151,14 @@ Loop *LoopInfo::ConsiderForLoop(BasicBlock *BB, const DominatorSet &DS) {
Loop *L = new Loop(BB);
BBMap[BB] = L;
BasicBlock *EntryBlock = &BB->getParent()->getEntryBlock();
while (!TodoStack.empty()) { // Process all the nodes in the loop
BasicBlock *X = TodoStack.back();
TodoStack.pop_back();
if (!L->contains(X)) { // As of yet unprocessed??
if (!L->contains(X) && // As of yet unprocessed??
DS.dominates(EntryBlock, X)) { // X is reachable from entry block?
// Check to see if this block already belongs to a loop. If this occurs
// then we have a case where a loop that is supposed to be a child of the
// current loop was processed before the current loop. When this occurs,