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compute dominator tree children in a deterministic order that does not depend

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on the address of BasicBlock objects in memory.  This eliminates stuff like this:

 Inorder Dominator Tree:
   [1]  %entry
     [2]  %loopentry
-      [3]  %loopexit
       [3]  %no_exit
-        [4]  %endif
         [4]  %then
+        [4]  %endif
+      [3]  %loopexit
       [3]  %return


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14253 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-06-19 20:13:48 +00:00
parent f6437a3023
commit fab8596459
1 changed files with 11 additions and 10 deletions
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21
lib/VMCore/Dominators.cpp
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@ -373,19 +373,20 @@ void DominatorTree::calculate(const ImmediateDominators &ID) {
BasicBlock *Root = Roots[0];
Nodes[Root] = RootNode = new Node(Root, 0); // Add a node for the root...
Function *F = Root->getParent();
// Loop over all of the reachable blocks in the function...
for (ImmediateDominators::const_iterator I = ID.begin(), E = ID.end();
I != E; ++I) {
Node *&BBNode = Nodes[I->first];
if (!BBNode) { // Haven't calculated this node yet?
// Get or calculate the node for the immediate dominator
Node *IDomNode = getNodeForBlock(I->second);
for (Function::iterator I = F->begin(), E = F->end(); I != E; ++I)
if (BasicBlock *ImmDom = ID.get(I)) { // Reachable block.
Node *&BBNode = Nodes[I];
if (!BBNode) { // Haven't calculated this node yet?
// Get or calculate the node for the immediate dominator
Node *IDomNode = getNodeForBlock(ImmDom);
// Add a new tree node for this BasicBlock, and link it as a child of
// IDomNode
BBNode = IDomNode->addChild(new Node(I->first, IDomNode));
// Add a new tree node for this BasicBlock, and link it as a child of
// IDomNode
BBNode = IDomNode->addChild(new Node(I, IDomNode));
}
}
}
}
static std::ostream &operator<<(std::ostream &o,