diff -r f353275af40e -r d5d065957597 src/cpu/x86/vm/templateTable_x86_64.cpp
--- a/src/cpu/x86/vm/templateTable_x86_64.cpp	Thu Sep 02 11:40:02 2010 -0700
+++ b/src/cpu/x86/vm/templateTable_x86_64.cpp	Fri Sep 03 17:51:07 2010 -0700
@@ -1583,51 +1583,71 @@
     // r14: locals pointer
     __ testl(rdx, rdx);             // check if forward or backward branch
     __ jcc(Assembler::positive, dispatch); // count only if backward branch
-
-    // increment counter
-    __ movl(rax, Address(rcx, be_offset));        // load backedge counter
-    __ incrementl(rax, InvocationCounter::count_increment); // increment
-                                                            // counter
-    __ movl(Address(rcx, be_offset), rax);        // store counter
-
-    __ movl(rax, Address(rcx, inv_offset));    // load invocation counter
-    __ andl(rax, InvocationCounter::count_mask_value); // and the status bits
-    __ addl(rax, Address(rcx, be_offset));        // add both counters
-
-    if (ProfileInterpreter) {
-      // Test to see if we should create a method data oop
-      __ cmp32(rax,
-               ExternalAddress((address) &InvocationCounter::InterpreterProfileLimit));
-      __ jcc(Assembler::less, dispatch);
-
-      // if no method data exists, go to profile method
-      __ test_method_data_pointer(rax, profile_method);
-
-      if (UseOnStackReplacement) {
-        // check for overflow against ebx which is the MDO taken count
-        __ cmp32(rbx,
-                 ExternalAddress((address) &InvocationCounter::InterpreterBackwardBranchLimit));
-        __ jcc(Assembler::below, dispatch);
-
-        // When ProfileInterpreter is on, the backedge_count comes
-        // from the methodDataOop, which value does not get reset on
-        // the call to frequency_counter_overflow().  To avoid
-        // excessive calls to the overflow routine while the method is
-        // being compiled, add a second test to make sure the overflow
-        // function is called only once every overflow_frequency.
-        const int overflow_frequency = 1024;
-        __ andl(rbx, overflow_frequency - 1);
-        __ jcc(Assembler::zero, backedge_counter_overflow);
-
+    if (TieredCompilation) {
+      Label no_mdo;
+      int increment = InvocationCounter::count_increment;
+      int mask = ((1 << Tier0BackedgeNotifyFreqLog) - 1) << InvocationCounter::count_shift;
+      if (ProfileInterpreter) {
+        // Are we profiling?
+        __ movptr(rbx, Address(rcx, in_bytes(methodOopDesc::method_data_offset())));
+        __ testptr(rbx, rbx);
+        __ jccb(Assembler::zero, no_mdo);
+        // Increment the MDO backedge counter
+        const Address mdo_backedge_counter(rbx, in_bytes(methodDataOopDesc::backedge_counter_offset()) +
+                                           in_bytes(InvocationCounter::counter_offset()));
+        __ increment_mask_and_jump(mdo_backedge_counter, increment, mask,
+                                   rax, false, Assembler::zero, &backedge_counter_overflow);
+        __ jmp(dispatch);
       }
+      __ bind(no_mdo);
+      // Increment backedge counter in methodOop
+      __ increment_mask_and_jump(Address(rcx, be_offset), increment, mask,
+                                 rax, false, Assembler::zero, &backedge_counter_overflow);
     } else {
-      if (UseOnStackReplacement) {
-        // check for overflow against eax, which is the sum of the
-        // counters
+      // increment counter
+      __ movl(rax, Address(rcx, be_offset));        // load backedge counter
+      __ incrementl(rax, InvocationCounter::count_increment); // increment counter
+      __ movl(Address(rcx, be_offset), rax);        // store counter
+
+      __ movl(rax, Address(rcx, inv_offset));    // load invocation counter
+      __ andl(rax, InvocationCounter::count_mask_value); // and the status bits
+      __ addl(rax, Address(rcx, be_offset));        // add both counters
+
+      if (ProfileInterpreter) {
+        // Test to see if we should create a method data oop
         __ cmp32(rax,
-                 ExternalAddress((address) &InvocationCounter::InterpreterBackwardBranchLimit));
-        __ jcc(Assembler::aboveEqual, backedge_counter_overflow);
-
+                 ExternalAddress((address) &InvocationCounter::InterpreterProfileLimit));
+        __ jcc(Assembler::less, dispatch);
+
+        // if no method data exists, go to profile method
+        __ test_method_data_pointer(rax, profile_method);
+
+        if (UseOnStackReplacement) {
+          // check for overflow against ebx which is the MDO taken count
+          __ cmp32(rbx,
+                   ExternalAddress((address) &InvocationCounter::InterpreterBackwardBranchLimit));
+          __ jcc(Assembler::below, dispatch);
+
+          // When ProfileInterpreter is on, the backedge_count comes
+          // from the methodDataOop, which value does not get reset on
+          // the call to frequency_counter_overflow().  To avoid
+          // excessive calls to the overflow routine while the method is
+          // being compiled, add a second test to make sure the overflow
+          // function is called only once every overflow_frequency.
+          const int overflow_frequency = 1024;
+          __ andl(rbx, overflow_frequency - 1);
+          __ jcc(Assembler::zero, backedge_counter_overflow);
+
+        }
+      } else {
+        if (UseOnStackReplacement) {
+          // check for overflow against eax, which is the sum of the
+          // counters
+          __ cmp32(rax,
+                   ExternalAddress((address) &InvocationCounter::InterpreterBackwardBranchLimit));
+          __ jcc(Assembler::aboveEqual, backedge_counter_overflow);
+
+        }
       }
     }
     __ bind(dispatch);
@@ -2912,7 +2932,8 @@
 void TemplateTable::invokevirtual_helper(Register index,
                                          Register recv,
                                          Register flags) {
-  // Uses temporary registers rax, rdx  assert_different_registers(index, recv, rax, rdx);
+  // Uses temporary registers rax, rdx
+  assert_different_registers(index, recv, rax, rdx);
 
   // Test for an invoke of a final method
   Label notFinal;