diff -r 3f49d30f8184 -r d86923d96dca src/cpu/x86/vm/assembler_x86.cpp
--- a/src/cpu/x86/vm/assembler_x86.cpp	Thu Apr 07 21:32:23 2011 -0700
+++ b/src/cpu/x86/vm/assembler_x86.cpp	Fri Apr 08 17:03:31 2011 -0700
@@ -7941,12 +7941,12 @@
 #endif
   push(rax);                          // save rax,
   // addr may contain rsp so we will have to adjust it based on the push
-  // we just did
+  // we just did (and on 64 bit we do two pushes)
   // NOTE: 64bit seemed to have had a bug in that it did movq(addr, rax); which
   // stores rax into addr which is backwards of what was intended.
   if (addr.uses(rsp)) {
     lea(rax, addr);
-    pushptr(Address(rax, BytesPerWord));
+    pushptr(Address(rax, LP64_ONLY(2 *) BytesPerWord));
   } else {
     pushptr(addr);
   }
@@ -8396,6 +8396,17 @@
     movptr(dst, src);
 }
 
+// Doesn't do verfication, generates fixed size code
+void MacroAssembler::load_heap_oop_not_null(Register dst, Address src) {
+#ifdef _LP64
+  if (UseCompressedOops) {
+    movl(dst, src);
+    decode_heap_oop_not_null(dst);
+  } else
+#endif
+    movptr(dst, src);
+}
+
 void MacroAssembler::store_heap_oop(Address dst, Register src) {
 #ifdef _LP64
   if (UseCompressedOops) {