From 63c66724235ace1860e60a11ce2756d577387b29 Mon Sep 17 00:00:00 2001
From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Mon, 16 Jan 2012 20:38:31 +0000
Subject: [PATCH] Give better scavenger errors by invoking the verifier.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@148251 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/CodeGen/RegisterScavenging.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/CodeGen/RegisterScavenging.cpp b/lib/CodeGen/RegisterScavenging.cpp
index 07cf0276912..16c5898e168 100644
--- a/lib/CodeGen/RegisterScavenging.cpp
+++ b/lib/CodeGen/RegisterScavenging.cpp
@@ -205,7 +205,12 @@ void RegScavenger::forward() {
             SubUsed = true;
             break;
           }
-        assert(SubUsed && "Using an undefined register!");
+#ifndef NDEBUG
+        if (!SubUsed) {
+          MBB->getParent()->verify(NULL, "In Register Scavenger");
+          llvm_unreachable("Using an undefined register!");
+        }
+#endif
         (void)SubUsed;
       }
       assert((!EarlyClobberRegs.test(Reg) || MI->isRegTiedToDefOperand(i)) &&
-- 
2.34.1