From 1b67d6c565d9743a5ac1d1c17eabc42b81cd976c Mon Sep 17 00:00:00 2001
From: Cameron Zwarich <zwarich@apple.com>
Date: Mon, 20 Dec 2010 00:08:10 +0000
Subject: Ignore debug values when performing MachineVerifier liveness checks.
 Fixes PR8822.

llvm-svn: 122207
---
 llvm/lib/CodeGen/MachineVerifier.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'llvm/lib/CodeGen/MachineVerifier.cpp')

diff --git a/llvm/lib/CodeGen/MachineVerifier.cpp b/llvm/lib/CodeGen/MachineVerifier.cpp
index f7713fd..4025e29 100644
--- a/llvm/lib/CodeGen/MachineVerifier.cpp
+++ b/llvm/lib/CodeGen/MachineVerifier.cpp
@@ -587,7 +587,9 @@ MachineVerifier::visitMachineOperand(const MachineOperand *MO, unsigned MONum) {
       return;
 
     // Check Live Variables.
-    if (MO->isUndef()) {
+    if (MI->isDebugValue()) {
+      // Liveness checks are not valid for debug values.
+    } else if (MO->isUndef()) {
       // An <undef> doesn't refer to any register, so just skip it.
     } else if (MO->isUse()) {
       regsLiveInButUnused.erase(Reg);
-- 
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