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Enhance the TD pass to build composite graphs when we have indirect call

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sites that target multiple callees.  If we have a function table, for
example, with N callees, and M callers call through it, we used to have
to perform O(M*N) graph inlinings.  Now we perform O(M+N) inlinings.

This speeds up the td pass on perlbmk from 36.26s to 25.75s.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20743 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-03-21 20:31:29 +00:00
parent d75e334d24
commit 275b301740
1 changed files with 109 additions and 18 deletions
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127
lib/Analysis/DataStructure/TopDownClosure.cpp
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@ -62,9 +62,11 @@ bool TDDataStructures::runOnModule(Module &M) {
const DSScalarMap &GGSM = GlobalsGraph->getScalarMap();
hash_set<DSNode*> Visited;
for (DSScalarMap::global_iterator I=GGSM.global_begin(), E=GGSM.global_end();
I != E; ++I)
markReachableFunctionsExternallyAccessible(GGSM.find(*I)->second.getNode(),
Visited);
I != E; ++I) {
DSNode *N = GGSM.find(*I)->second.getNode();
if (N->isIncomplete())
markReachableFunctionsExternallyAccessible(N, Visited);
}
// Loop over unresolved call nodes. Any functions passed into (but not
// returned!) from unresolvable call nodes may be invoked outside of the
@ -104,6 +106,13 @@ bool TDDataStructures::runOnModule(Module &M) {
PostOrder.pop_back();
}
// Free the IndCallMap.
while (!IndCallMap.empty()) {
delete IndCallMap.begin()->second;
IndCallMap.erase(IndCallMap.begin());
}
ArgsRemainIncomplete.clear();
GlobalsGraph->removeTriviallyDeadNodes();
@ -202,8 +211,6 @@ void TDDataStructures::InlineCallersIntoGraph(DSGraph &DSG) {
GI = DSG.getScalarMap().global_begin(),
E = DSG.getScalarMap().global_end(); GI != E; ++GI)
RC.getClonedNH(GG.getNodeForValue(*GI));
}
DEBUG(std::cerr << "[TD] Inlining callers into '" << DSG.getFunctionNames()
@ -223,16 +230,21 @@ void TDDataStructures::InlineCallersIntoGraph(DSGraph &DSG) {
do {
const DSCallSite &CS = *EdgesFromCaller.back().CS;
Function &CF = *EdgesFromCaller.back().CalledFunction;
DEBUG(std::cerr << " [TD] Inlining graph for call to Fn '"
<< CF.getName() << "' from Fn '"
<< CS.getCallSite().getInstruction()->
getParent()->getParent()->getName()
<< "': " << CF.getFunctionType()->getNumParams()
DEBUG(std::cerr << " [TD] Inlining graph into Fn '"
<< CF.getName() << "' from ");
if (CallerGraph.getReturnNodes().empty())
DEBUG(std::cerr << "SYNTHESIZED INDIRECT GRAPH");
else
DEBUG (std::cerr << "Fn '"
<< CS.getCallSite().getInstruction()->
getParent()->getParent()->getName() << "'");
DEBUG(std::cerr << ": " << CF.getFunctionType()->getNumParams()
<< " args\n");
// Get the formal argument and return nodes for the called function and
// merge them with the cloned subgraph.
RC.mergeCallSite(DSG.getCallSiteForArguments(CF), CS);
DSCallSite T1 = DSG.getCallSiteForArguments(CF);
RC.mergeCallSite(T1, CS);
++NumTDInlines;
EdgesFromCaller.pop_back();
@ -276,19 +288,98 @@ void TDDataStructures::InlineCallersIntoGraph(DSGraph &DSG) {
// edges to the CallerEdges structure for each callee.
for (DSGraph::fc_iterator CI = DSG.fc_begin(), E = DSG.fc_end();
CI != E; ++CI) {
// Handle direct calls efficiently.
if (CI->isDirectCall()) {
if (!CI->getCalleeFunc()->isExternal() &&
!DSG.getReturnNodes().count(CI->getCalleeFunc()))
CallerEdges[&getDSGraph(*CI->getCalleeFunc())]
.push_back(CallerCallEdge(&DSG, &*CI, CI->getCalleeFunc()));
continue;
}
Instruction *CallI = CI->getCallSite().getInstruction();
// For each function in the invoked function list at this call site...
std::pair<BUDataStructures::ActualCalleesTy::const_iterator,
BUDataStructures::ActualCalleesTy::const_iterator>
IP = ActualCallees.equal_range(CallI);
// Loop over each actual callee at this call site
for (BUDataStructures::ActualCalleesTy::const_iterator I = IP.first;
I != IP.second; ++I) {
DSGraph& CalleeGraph = getDSGraph(*I->second);
if (&CalleeGraph != &DSG)
CallerEdges[&CalleeGraph].push_back(CallerCallEdge(&DSG, &*CI,
I->second));
// Skip over all calls to this graph (SCC calls).
while (IP.first != IP.second && &getDSGraph(*IP.first->second) == &DSG)
++IP.first;
// All SCC calls?
if (IP.first == IP.second) continue;
Function *FirstCallee = IP.first->second;
++IP.first;
// Skip over more SCC calls.
while (IP.first != IP.second && &getDSGraph(*IP.first->second) == &DSG)
++IP.first;
// If there is exactly one callee from this call site, remember the edge in
// CallerEdges.
if (IP.first == IP.second) {
if (!FirstCallee->isExternal())
CallerEdges[&getDSGraph(*FirstCallee)]
.push_back(CallerCallEdge(&DSG, &*CI, FirstCallee));
continue;
}
// Otherwise, there are multiple callees from this call site, so it must be
// an indirect call. Chances are that there will be other call sites with
// this set of targets. If so, we don't want to do M*N inlining operations,
// so we build up a new, private, graph that represents the calls of all
// calls to this set of functions.
std::vector<Function*> Callees;
IP = ActualCallees.equal_range(CallI);
for (BUDataStructures::ActualCalleesTy::const_iterator I = IP.first;
I != IP.second; ++I)
if (!I->second->isExternal())
Callees.push_back(I->second);
std::sort(Callees.begin(), Callees.end());
std::map<std::vector<Function*>, DSGraph*>::iterator IndCallRecI =
IndCallMap.lower_bound(Callees);
DSGraph *IndCallGraph;
// If we already have this graph, recycle it.
if (IndCallRecI != IndCallMap.end() && IndCallRecI->first == Callees) {
std::cerr << " [TD] *** Reuse of indcall graph for " << Callees.size()
<< " callees!\n";
IndCallGraph = IndCallRecI->second;
} else {
// Otherwise, create a new DSGraph to represent this.
IndCallGraph = new DSGraph(DSG.getGlobalECs(), DSG.getTargetData());
// Make a nullary dummy call site, which will eventually get some content
// merged into it. The actual callee function doesn't matter here, so we
// just pass it something to keep the ctor happy.
std::vector<DSNodeHandle> ArgDummyVec;
DSCallSite DummyCS(CI->getCallSite(), DSNodeHandle(), Callees[0]/*dummy*/,
ArgDummyVec);
IndCallGraph->getFunctionCalls().push_back(DummyCS);
IndCallRecI = IndCallMap.insert(IndCallRecI,
std::make_pair(Callees, IndCallGraph));
// Additionally, make sure that each of the callees inlines this graph
// exactly once.
DSCallSite *NCS = &IndCallGraph->getFunctionCalls().front();
for (unsigned i = 0, e = Callees.size(); i != e; ++i) {
DSGraph& CalleeGraph = getDSGraph(*Callees[i]);
if (&CalleeGraph != &DSG)
CallerEdges[&CalleeGraph].push_back(CallerCallEdge(IndCallGraph, NCS,
Callees[i]));
}
}
// Now that we know which graph to use for this, merge the caller
// information into the graph, based on information from the call site.
ReachabilityCloner RC(*IndCallGraph, DSG, 0);
RC.mergeCallSite(IndCallGraph->getFunctionCalls().front(), *CI);
}
}