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If only user of a vreg is an copy instruction to export copy of vreg out of current basic block then insert DBG_VALUE so that debug value of the variable is also transfered to new vreg.

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Testcase is in r114476.
This fixes radar 8412415.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114478 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel 2010-09-21 20:56:33 +00:00
parent 161f0caaf9
commit 44cfe14445
1 changed files with 23 additions and 0 deletions
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23
lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
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@ -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);
}
}
}