-static bool ProfitableToMerge(MachineBasicBlock *MBB1,
- MachineBasicBlock *MBB2,
- unsigned minCommonTailLength,
- unsigned &CommonTailLen,
- MachineBasicBlock::iterator &I1,
- MachineBasicBlock::iterator &I2,
- MachineBasicBlock *SuccBB,
- MachineBasicBlock *PredBB) {
+static bool
+ProfitableToMerge(MachineBasicBlock *MBB1, MachineBasicBlock *MBB2,
+ unsigned minCommonTailLength, unsigned &CommonTailLen,
+ MachineBasicBlock::iterator &I1,
+ MachineBasicBlock::iterator &I2, MachineBasicBlock *SuccBB,
+ MachineBasicBlock *PredBB,
+ DenseMap<const MachineBasicBlock *, int> &FuncletMembership) {
+ // It is never profitable to tail-merge blocks from two different funclets.
+ if (!FuncletMembership.empty()) {
+ auto Funclet1 = FuncletMembership.find(MBB1);
+ assert(Funclet1 != FuncletMembership.end());
+ auto Funclet2 = FuncletMembership.find(MBB2);
+ assert(Funclet2 != FuncletMembership.end());
+ if (Funclet1->second != Funclet2->second)
+ return false;
+ }
+