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Preparation for Optimal Edge Profiling:

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Optimal edge profiling is only possible when blocks with no predecessors get an
virtual edge (BB,0) that counts the execution frequencies of this
function-exiting blocks.
This patch makes the necessary changes before actually enabling optimal edge profiling.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80667 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andreas Neustifter 2009-09-01 10:06:05 +00:00
parent e7ddcfdebe
commit e885af9fb7
2 changed files with 15 additions and 3 deletions
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9
include/llvm/Analysis/ProfileInfo.h
View File

@ -63,8 +63,13 @@ namespace llvm {
// getFunction() - Returns the Function for an Edge, checking for validity.
static const Function* getFunction(Edge e) {
assert(e.second && "Invalid ProfileInfo::Edge");
return e.second->getParent();
if (e.first) {
return e.first->getParent();
} else if (e.second) {
return e.second->getParent();
}
assert(0 && "Invalid ProfileInfo::Edge");
return (const Function*)0;
}
// getEdge() - Creates an Edge from two BasicBlocks.

9
lib/Analysis/ProfileEstimatorPass.cpp
View File

@ -168,7 +168,14 @@ void ProfileEstimatorPass::recurseBasicBlock(BasicBlock *BB) {
std::set<BasicBlock*> ProcessedSuccs;
// Otherwise consider weight of outgoing edges and store them for
// distribution of remaining weight.
// distribution of remaining weight. In case the block has no successors
// create a (BB,0) edge.
succ_iterator bbi = succ_begin(BB), bbe = succ_end(BB);
if (bbi == bbe) {
Edge edge = getEdge(BB,0);
EdgeInformation[BB->getParent()][edge] = BBWeight;
printEdgeWeight(edge);
}
for ( succ_iterator bbi = succ_begin(BB), bbe = succ_end(BB);
bbi != bbe; ++bbi ) {
if (ProcessedSuccs.insert(*bbi).second) {