From 6de6d3e4ec54944475e1daaaddcf86e50c8323ad 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.

llvm-svn: 148251
---
 llvm/lib/CodeGen/RegisterScavenging.cpp | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/llvm/lib/CodeGen/RegisterScavenging.cpp b/llvm/lib/CodeGen/RegisterScavenging.cpp
index 07cf02769124..16c5898e1683 100644
--- a/llvm/lib/CodeGen/RegisterScavenging.cpp
+++ b/llvm/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)) &&