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Make the indirect branch optimization deterministic. No functionality change.

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Patch by Daniel Reynaud.

llvm-svn: 166501
This commit is contained in:
Nadav Rotem 2012-10-23 21:05:33 +00:00
parent dc9dc4a3e5
commit fee4ada68b
1 changed files with 8 additions and 8 deletions
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16
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -2604,14 +2604,14 @@ void SelectionDAGBuilder::visitIndirectBr(const IndirectBrInst &I) {
MachineBasicBlock *IndirectBrMBB = FuncInfo.MBB;
// Update machine-CFG edges with unique successors.
SmallVector<BasicBlock*, 32> succs;
succs.reserve(I.getNumSuccessors());
for (unsigned i = 0, e = I.getNumSuccessors(); i != e; ++i)
succs.push_back(I.getSuccessor(i));
array_pod_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) {
MachineBasicBlock *Succ = FuncInfo.MBBMap[succs[i]];
SmallSet<BasicBlock*, 32> Done;
for (unsigned i = 0, e = I.getNumSuccessors(); i != e; ++i) {
BasicBlock *BB = I.getSuccessor(i);
bool Inserted = Done.insert(BB);
if (!Inserted)
continue;
MachineBasicBlock *Succ = FuncInfo.MBBMap[BB];
addSuccessorWithWeight(IndirectBrMBB, Succ);
}