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Handle the case when block dominates itself.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37773 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2007-06-28 02:07:08 +00:00
parent eb62eca503
commit dc3a207e78
1 changed files with 4 additions and 1 deletions
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5
include/llvm/Analysis/Dominators.h
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@ -185,7 +185,7 @@ protected:
const DomTreeNode *B) const {
const DomTreeNode *IDom;
if (A == 0 || B == 0) return false;
while ((IDom = B->getIDom()) != 0 && IDom != A)
while ((IDom = B->getIDom()) != 0 && IDom != A && IDom != B)
B = IDom; // Walk up the tree
return IDom != 0;
}
@ -244,6 +244,9 @@ protected:
DomTreeNode *addNewBlock(BasicBlock *BB, BasicBlock *DomBB) {
assert(getNode(BB) == 0 && "Block already in dominator tree!");
DomTreeNode *IDomNode = getNode(DomBB);
// Check if BB dominates itself.
//if (!IDomNode && BB == DomBB)
// IDomNode = BB;
assert(IDomNode && "Not immediate dominator specified for block!");
DFSInfoValid = false;
return DomTreeNodes[BB] =