Do not generate duplicate dbg_value instructions for function arguments.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@102585 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index cb933d7..38e0c29 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -3684,17 +3684,17 @@
/// EmitFuncArgumentDbgValue - If the DbgValueInst is a dbg_value of a function
/// argument, create the corresponding DBG_VALUE machine instruction for it now.
/// At the end of instruction selection, they will be inserted to the entry BB.
-void
+bool
SelectionDAGBuilder::EmitFuncArgumentDbgValue(const DbgValueInst &DI,
const Value *V, MDNode *Variable,
uint64_t Offset, SDValue &N) {
if (!isa<Argument>(V))
- return;
+ return false;
MachineFunction &MF = DAG.getMachineFunction();
MachineBasicBlock *MBB = FuncInfo.MBBMap[DI.getParent()];
if (MBB != &MF.front())
- return;
+ return false;
unsigned Reg = 0;
if (N.getOpcode() == ISD::CopyFromReg) {
@@ -3710,13 +3710,14 @@
if (!Reg)
Reg = FuncInfo.ValueMap[V];
if (!Reg)
- return;
+ return false;
const TargetInstrInfo *TII = DAG.getTarget().getInstrInfo();
MachineInstrBuilder MIB = BuildMI(MF, getCurDebugLoc(),
TII->get(TargetOpcode::DBG_VALUE))
.addReg(Reg).addImm(Offset).addMetadata(Variable);
FuncInfo.ArgDbgValues.push_back(&*MIB);
+ return true;
}
/// visitIntrinsicCall - Lower the call to the specified intrinsic function. If
@@ -3895,10 +3896,11 @@
} else {
SDValue &N = NodeMap[V];
if (N.getNode()) {
- EmitFuncArgumentDbgValue(DI, V, Variable, Offset, N);
- SDV = DAG.getDbgValue(Variable, N.getNode(),
- N.getResNo(), Offset, dl, SDNodeOrder);
- DAG.AddDbgValue(SDV, N.getNode(), false);
+ if (!EmitFuncArgumentDbgValue(DI, V, Variable, Offset, N)) {
+ SDV = DAG.getDbgValue(Variable, N.getNode(),
+ N.getResNo(), Offset, dl, SDNodeOrder);
+ DAG.AddDbgValue(SDV, N.getNode(), false);
+ }
} else {
// We may expand this to cover more cases. One case where we have no
// data available is an unreferenced parameter; we need this fallback.