From e7181b5fdb590c90ec1f559b148d3aa2d546a320 Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Wed, 1 Jun 2011 23:00:17 +0000
Subject: A DBG_VALUE that truncates a range does not start another dbg value
 range.

llvm-svn: 132433
---
 llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp')

diff --git a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
index 0dc5b74fa37..c09c1c558e5 100644
--- a/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
@@ -1411,6 +1411,11 @@ DwarfDebug::collectVariableInfo(const MachineFunction *MF,
       const MachineInstr *Begin = *HI;
       assert(Begin->isDebugValue() && "Invalid History entry");
 
+      // Check if DBG_VALUE is truncating a range.
+      if (Begin->getNumOperands() > 1 && Begin->getOperand(0).isReg()
+          && !Begin->getOperand(0).getReg())
+        continue;
+
       // Compute the range for a register location.
       const MCSymbol *FLabel = getLabelBeforeInsn(Begin);
       const MCSymbol *SLabel = 0;
-- 
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