From 70a0145d7cad8f134f80be536c76a87ed27ea5e0 Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Thu, 29 Apr 2010 01:23:55 +0000
Subject: [PATCH] Avoid emitting a dbg_value machineinstr that's not going to
 be inserted into entry block.

llvm-svn: 102581
---
 llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp | 2 ++
 llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp    | 2 --
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 254a6543ffd6..cb933d7cdd51 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -3709,6 +3709,8 @@ SelectionDAGBuilder::EmitFuncArgumentDbgValue(const DbgValueInst &DI,
 
   if (!Reg)
     Reg = FuncInfo.ValueMap[V];
+  if (!Reg)
+    return;
 
   const TargetInstrInfo *TII = DAG.getTarget().getInstrInfo();
   MachineInstrBuilder MIB = BuildMI(MF, getCurDebugLoc(),
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 88245de01304..adb321d929cf 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -222,8 +222,6 @@ bool SelectionDAGISel::runOnMachineFunction(MachineFunction &mf) {
   for (unsigned i = 0, e = FuncInfo->ArgDbgValues.size(); i != e; ++i) {
     MachineInstr *MI = FuncInfo->ArgDbgValues[e-i-1];
     unsigned Reg = MI->getOperand(0).getReg();
-    if (!Reg)
-      continue;
     if (TargetRegisterInfo::isPhysicalRegister(Reg))
       EntryMBB->insert(EntryMBB->begin(), MI);
     else {