Add an assertion instead of crashing when the scavenger goes past the end

of a basic block.

llvm-svn: 128925

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/RegisterScavenging.cpp b/llvm/lib/CodeGen/RegisterScavenging.cpp
index b9dd28e5c78..ebfe533838d 100644
--- a/llvm/lib/CodeGen/RegisterScavenging.cpp
+++ b/llvm/lib/CodeGen/RegisterScavenging.cpp
@@ -126,9 +126,10 @@ void RegScavenger::forward() {
     MBBI = MBB->begin();
     Tracking = true;
   } else {
-    assert(MBBI != MBB->end() && "Already at the end of the basic block!");
+    assert(MBBI != MBB->end() && "Already past the end of the basic block!");
     MBBI = llvm::next(MBBI);
   }
+  assert(MBBI != MBB->end() && "Already at the end of the basic block!");
 
   MachineInstr *MI = MBBI;