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Remove duplicate successors from indirectbr instructions before building the machine CFG.

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This makes early tail duplication run 60 times faster when compiling the Firefox
JavaScript interpreter, see PR6186.

llvm-svn: 95831
This commit is contained in:
Jakob Stoklund Olesen 2010-02-11 00:34:18 +00:00
parent e87a8a944d
commit 215d9f3898
1 changed files with 8 additions and 2 deletions
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10
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -2062,9 +2062,15 @@ void SelectionDAGBuilder::visitSwitch(SwitchInst &SI) {
}
void SelectionDAGBuilder::visitIndirectBr(IndirectBrInst &I) {
// Update machine-CFG edges.
// Update machine-CFG edges with unique successors.
std::vector<BasicBlock*> succs;
succs.reserve(I.getNumSuccessors());
for (unsigned i = 0, e = I.getNumSuccessors(); i != e; ++i)
CurMBB->addSuccessor(FuncInfo.MBBMap[I.getSuccessor(i)]);
succs.push_back(I.getSuccessor(i));
std::sort(succs.begin(), succs.end());
succs.erase(std::unique(succs.begin(), succs.end()), succs.end());
for (unsigned i = 0, e = succs.size(); i != e; ++i)
CurMBB->addSuccessor(FuncInfo.MBBMap[succs[i]]);
DAG.setRoot(DAG.getNode(ISD::BRIND, getCurDebugLoc(),
MVT::Other, getControlRoot(),