diff options
| -rw-r--r-- | lib/CodeGen/LiveVariables.cpp | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/lib/CodeGen/LiveVariables.cpp b/lib/CodeGen/LiveVariables.cpp index aec62dfcdf..539799ec58 100644 --- a/lib/CodeGen/LiveVariables.cpp +++ b/lib/CodeGen/LiveVariables.cpp @@ -152,7 +152,12 @@ void LiveVariables::HandleVirtRegUse(VarInfo &VRInfo, MachineBasicBlock *MBB, "Should have kill for defblock!"); // Add a new kill entry for this basic block. - VRInfo.Kills.push_back(MI); + unsigned BBNum = MBB->getNumber(); + // If this virtual register is already marked as alive in this basic block, + // that means it is alive in at least one of the successor block, it's not + // a kill. + if (VRInfo.AliveBlocks.size() <= BBNum || !VRInfo.AliveBlocks[BBNum]) + VRInfo.Kills.push_back(MI); // Update all dominating blocks to mark them known live. for (MachineBasicBlock::const_pred_iterator PI = MBB->pred_begin(), |