From 1c8ab781d5b24bc473b4baa8f3fb6e9b55597aa3 Mon Sep 17 00:00:00 2001
From: Jim Grosbach <grosbach@apple.com>
Date: Fri, 4 Jun 2010 20:18:30 +0000
Subject: [PATCH] Skip dbg_value instructions when scanning instructions in
 register scavenging.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105481 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/RegisterScavenging.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/CodeGen/RegisterScavenging.cpp b/lib/CodeGen/RegisterScavenging.cpp
index 690e59f96eb..b3e79756b62 100644
--- a/lib/CodeGen/RegisterScavenging.cpp
+++ b/lib/CodeGen/RegisterScavenging.cpp
@@ -258,6 +258,10 @@ unsigned RegScavenger::findSurvivorReg(MachineBasicBlock::iterator StartMI,
 
   bool inVirtLiveRange = false;
   for (++MI; InstrLimit > 0 && MI != ME; ++MI, --InstrLimit) {
+    if (MI->isDebugValue()) {
+      ++InstrLimit; // Don't count debug instructions
+      continue;
+    }
     bool isVirtKillInsn = false;
     bool isVirtDefInsn = false;
     // Remove any candidates touched by instruction.