diff options
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp index a754ac2040..7ec1492b71 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp +++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp @@ -290,6 +290,29 @@ bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) { TII.get(TargetOpcode::DBG_VALUE)) .addReg(LDI->second, RegState::Debug) .addImm(Offset).addMetadata(Variable); + + // If this vreg is directly copied into an exported register then + // that COPY instructions also need DBG_VALUE, if it is the only + // user of LDI->second. + MachineInstr *CopyUseMI = NULL; + for (MachineRegisterInfo::use_iterator + UI = RegInfo->use_begin(LDI->second); + MachineInstr *UseMI = UI.skipInstruction();) { + if (UseMI->isDebugValue()) continue; + if (UseMI->isCopy() && !CopyUseMI && UseMI->getParent() == EntryMBB) { + CopyUseMI = UseMI; continue; + } + // Otherwise this is another use or second copy use. + CopyUseMI = NULL; break; + } + if (CopyUseMI) { + MachineInstr *NewMI = + BuildMI(*MF, CopyUseMI->getDebugLoc(), + TII.get(TargetOpcode::DBG_VALUE)) + .addReg(CopyUseMI->getOperand(0).getReg(), RegState::Debug) + .addImm(Offset).addMetadata(Variable); + EntryMBB->insertAfter(CopyUseMI, NewMI); + } } } |