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Implement optimization for direct function call case. This dramatically

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reduces the number of function nodes created and speeds up analysis by
about 10% overall.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5495 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2003-02-05 21:59:58 +00:00
parent bbe5ac1458
commit 923fc05b3a
13 changed files with 209 additions and 97 deletions
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36
lib/Analysis/DataStructure/DataStructure.cpp
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@ -799,7 +799,8 @@ static void removeIdenticalCalls(std::vector<DSCallSite> &Calls,
std::sort(Calls.begin(), Calls.end()); // Sort by callee as primary key!
// Scan the call list cleaning it up as necessary...
DSNode *LastCalleeNode = 0;
DSNode *LastCalleeNode = 0;
Function *LastCalleeFunc = 0;
unsigned NumDuplicateCalls = 0;
bool LastCalleeContainsExternalFunction = false;
for (unsigned i = 0; i != Calls.size(); ++i) {
@ -807,8 +808,9 @@ static void removeIdenticalCalls(std::vector<DSCallSite> &Calls,
// If the Callee is a useless edge, this must be an unreachable call site,
// eliminate it.
killIfUselessEdge(CS.getCallee());
if (CS.getCallee().getNode() == 0) {
if (CS.isIndirectCall() && CS.getCalleeNode()->getReferrers().size() == 1 &&
CS.getCalleeNode()->NodeType == 0) { // No useful info?
std::cerr << "WARNING: Useless call site found??\n";
CS.swap(Calls.back());
Calls.pop_back();
--i;
@ -826,11 +828,15 @@ static void removeIdenticalCalls(std::vector<DSCallSite> &Calls,
// never be resolved. Merge the arguments of the call node because no
// information will be lost.
//
if (CS.getCallee().getNode() == LastCalleeNode) {
if ((CS.isDirectCall() && CS.getCalleeFunc() == LastCalleeFunc) ||
(CS.isIndirectCall() && CS.getCalleeNode() == LastCalleeNode)) {
++NumDuplicateCalls;
if (NumDuplicateCalls == 1) {
LastCalleeContainsExternalFunction =
nodeContainsExternalFunction(LastCalleeNode);
if (LastCalleeNode)
LastCalleeContainsExternalFunction =
nodeContainsExternalFunction(LastCalleeNode);
else
LastCalleeContainsExternalFunction = LastCalleeFunc->isExternal();
}
if (LastCalleeContainsExternalFunction ||
@ -847,7 +853,13 @@ static void removeIdenticalCalls(std::vector<DSCallSite> &Calls,
OCS = CS;
}
} else {
LastCalleeNode = CS.getCallee().getNode();
if (CS.isDirectCall()) {
LastCalleeFunc = CS.getCalleeFunc();
LastCalleeNode = 0;
} else {
LastCalleeNode = CS.getCalleeNode();
LastCalleeFunc = 0;
}
NumDuplicateCalls = 0;
}
}
@ -877,7 +889,7 @@ void DSGraph::removeTriviallyDeadNodes() {
for (unsigned i = 0; i != Nodes.size(); ++i) {
DSNode *Node = Nodes[i];
if (!(Node->NodeType & ~(DSNode::Composition | DSNode::Array |
DSNode::DEAD))) {
DSNode::DEAD))) {
// This is a useless node if it has no mod/ref info (checked above),
// outgoing edges (which it cannot, as it is not modified in this
// context), and it has no incoming edges. If it is a global node it may
@ -918,7 +930,7 @@ void DSNode::markReachableNodes(hash_set<DSNode*> &ReachableNodes) {
void DSCallSite::markReachableNodes(hash_set<DSNode*> &Nodes) {
getRetVal().getNode()->markReachableNodes(Nodes);
getCallee().getNode()->markReachableNodes(Nodes);
if (isIndirectCall()) getCalleeNode()->markReachableNodes(Nodes);
for (unsigned i = 0, e = getNumPtrArgs(); i != e; ++i)
getPtrArg(i).getNode()->markReachableNodes(Nodes);
@ -954,8 +966,10 @@ static bool CanReachAliveNodes(DSNode *N, hash_set<DSNode*> &Alive,
//
static bool CallSiteUsesAliveArgs(DSCallSite &CS, hash_set<DSNode*> &Alive,
hash_set<DSNode*> &Visited) {
if (CanReachAliveNodes(CS.getRetVal().getNode(), Alive, Visited) ||
CanReachAliveNodes(CS.getCallee().getNode(), Alive, Visited))
if (CanReachAliveNodes(CS.getRetVal().getNode(), Alive, Visited))
return true;
if (CS.isIndirectCall() &&
CanReachAliveNodes(CS.getCalleeNode(), Alive, Visited))
return true;
for (unsigned i = 0, e = CS.getNumPtrArgs(); i != e; ++i)
if (CanReachAliveNodes(CS.getPtrArg(i).getNode(), Alive, Visited))