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Fix a performance regression from the CPR patch, simplify code

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14974 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-07-18 21:34:16 +00:00
parent 96940cb522
commit 8919cccc3d
1 changed files with 6 additions and 14 deletions
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20
lib/Transforms/IPO/Inliner.cpp
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@ -170,28 +170,20 @@ bool Inliner::doFinalization(CallGraph &CG) {
CallGraphNode *CGN = I->second;
Function *F = CGN ? CGN->getFunction() : 0;
// If the only remaining use of the function is a dead constant
// pointer ref, remove it.
if (F && F->hasOneUse())
if (Function *GV = dyn_cast<Function>(F->use_back()))
if (GV->removeDeadConstantUsers()) {
if (F->hasInternalLinkage()) {
// There *MAY* be an edge from the external call node to this
// function. If so, remove it.
CallGraphNode *EN = CG.getExternalCallingNode();
CallGraphNode::iterator I = std::find(EN->begin(), EN->end(), CGN);
if (I != EN->end()) EN->removeCallEdgeTo(CGN);
}
}
// If the only remaining users of the function are dead constants,
// remove them.
if (F) F->removeDeadConstantUsers();
if (F && (F->hasLinkOnceLinkage() || F->hasInternalLinkage()) &&
F->use_empty()) {
// Remove any call graph edges from the function to its callees.
while (CGN->begin() != CGN->end())
CGN->removeCallEdgeTo(*(CGN->end()-1));
// If the function has external linkage (basically if it's a linkonce
// function) remove the edge from the external node to the callee node.
// function) remove the edge from the external node to the callee
// node.
if (!F->hasInternalLinkage())
CG.getExternalCallingNode()->removeCallEdgeTo(CGN);