Fix RegScavenger::forward() to work on basic blocks containing exactly

one instruction.

llvm-svn: 61236

1 files changed, 1 insertions, 0 deletions

diff --git a/llvm/include/llvm/CodeGen/RegisterScavenging.h b/llvm/include/llvm/CodeGen/RegisterScavenging.h
index 40dd66c06a7..05e9e55e234 100644
--- a/llvm/include/llvm/CodeGen/RegisterScavenging.h
+++ b/llvm/include/llvm/CodeGen/RegisterScavenging.h
@@ -98,6 +98,7 @@ public:
   /// forward / backward - Move the internal MBB iterator and update register
   /// states until it has processed the specific iterator.
   void forward(MachineBasicBlock::iterator I) {
+    if (!Tracking && MBB->begin() != I) forward();
     while (MBBI != I) forward();
   }
   void backward(MachineBasicBlock::iterator I) {