diff options
| -rw-r--r-- | llvm/lib/CodeGen/PreAllocSplitting.cpp | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/llvm/lib/CodeGen/PreAllocSplitting.cpp b/llvm/lib/CodeGen/PreAllocSplitting.cpp index f09ea23c108..09f002aa265 100644 --- a/llvm/lib/CodeGen/PreAllocSplitting.cpp +++ b/llvm/lib/CodeGen/PreAllocSplitting.cpp @@ -648,6 +648,10 @@ bool PreAllocSplitting::SplitRegLiveInterval(LiveInterval *LI) { if (DefMI && LIs->isReMaterializable(*LI, ValNo, DefMI)) return false; + // If this would create a new join point, do not split. + if (DefMI && createsNewJoin(LR, DefMI->getParent(), Barrier->getParent())) + return false; + // Find all references in the barrier mbb. SmallPtrSet<MachineInstr*, 4> RefsInMBB; for (MachineRegisterInfo::reg_iterator I = MRI->reg_begin(CurrLI->reg), @@ -862,7 +866,7 @@ bool PreAllocSplitting::createsNewJoin(LiveRange* LR, Stack.push_back(std::make_pair(PredMBB, ++S)); continue; } else - Stack.push_back(std::make_pair(PredMBB, ++S)); + Stack.push_back(std::make_pair(PredMBB, S+1)); MachineBasicBlock* MBB = *S; Visited.insert(MBB); |
