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* Because of optimization, the shadow nodes between arguments might get

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removed.  Check to see if they are there.
* Repeat optimizations while changing


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1997 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-03-27 00:53:57 +00:00
parent 26f8a40b51
commit df8af1ca89
1 changed files with 14 additions and 13 deletions
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27
lib/Analysis/DataStructure/ComputeClosure.cpp
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@ -218,12 +218,14 @@ void FunctionDSGraph::computeClosure(const DataStructure &DS) {
if (CN->getNumArgs()) {
// The ArgNodes of the incorporated graph should be the nodes starting at
// StartNode, ordered the same way as the call arguments. The arg nodes
// are seperated by a single shadow node, so we need to be sure to step
// over them.
// are seperated by a single shadow node, but that shadow node might get
// eliminated in the process of optimization.
//
unsigned ArgOffset = StartNode;
for (unsigned i = 0, e = CN->getNumArgs(); i != e; ++i) {
// Get the arg node of the incorporated method...
while (!isa<ArgDSNode>(Nodes[ArgOffset])) // Scan for next arg node
ArgOffset++;
ArgDSNode *ArgNode = cast<ArgDSNode>(Nodes[ArgOffset]);
// Now we make all of the nodes inside of the incorporated method point
@ -232,16 +234,12 @@ void FunctionDSGraph::computeClosure(const DataStructure &DS) {
//
ResolveNodeTo(ArgNode, CN->getArgValues(i));
if (StartNode == 0) { // Self recursion?
ArgOffset += 2; // Skip over the argument & the shadow node...
} else {
if (StartNode) { // Not Self recursion?
// Remove the argnode from the set of nodes in this method...
Nodes.erase(Nodes.begin()+ArgOffset);
// ArgNode is no longer useful, delete now!
delete ArgNode;
ArgOffset++; // Skip over the shadow node for the argument
}
}
}
@ -249,13 +247,16 @@ void FunctionDSGraph::computeClosure(const DataStructure &DS) {
// Now the call node is completely destructable. Eliminate it now.
delete CN;
// Eliminate shadow nodes that are not distinguishable from some other
// node in the graph...
//
UnlinkUndistinguishableShadowNodes();
bool Changed = true;
while (Changed) {
// Eliminate shadow nodes that are not distinguishable from some other
// node in the graph...
//
Changed = UnlinkUndistinguishableShadowNodes();
// Eliminate shadow nodes that are now extraneous due to linking...
RemoveUnreachableShadowNodes();
// Eliminate shadow nodes that are now extraneous due to linking...
Changed |= RemoveUnreachableShadowNodes();
}
//if (F == Func) return; // Only do one self inlining