Add DEBUG message.

llvm-svn: 113614

1 files changed, 6 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/RegAllocFast.cpp b/llvm/lib/CodeGen/RegAllocFast.cpp
index fc150d55e22..83014024633 100644
--- a/llvm/lib/CodeGen/RegAllocFast.cpp
+++ b/llvm/lib/CodeGen/RegAllocFast.cpp
@@ -798,9 +798,11 @@ void RAFast::AllocateBasicBlock() {
             setPhysReg(MI, i, LRI->second.PhysReg);
           else {
             int SS = StackSlotForVirtReg[Reg];
-            if (SS == -1)
+            if (SS == -1) {
               // We can't allocate a physreg for a DebugValue, sorry!
+              DEBUG(dbgs() << "Unable to allocate vreg used by DBG_VALUE");
               MO.setReg(0);
+            }
             else {
               // Modify DBG_VALUE now that the value is in a spill slot.
               int64_t Offset = MI->getOperand(1).getImm();
@@ -817,9 +819,11 @@ void RAFast::AllocateBasicBlock() {
                 MI = NewDV;
                 ScanDbgValue = true;
                 break;
-              } else
+              } else {
                 // We can't allocate a physreg for a DebugValue; sorry!
+                DEBUG(dbgs() << "Unable to allocate vreg used by DBG_VALUE");
                 MO.setReg(0);
+              }
             }
           }
         }