Make the indirect branch optimization deterministic. No functionality change.
Patch by Daniel Reynaud.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166501 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index db15994..85103d5 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -2604,14 +2604,14 @@
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);
}