--- a/hotspot/src/cpu/sparc/vm/c1_LIRAssembler_sparc.cpp	Mon Oct 08 17:04:00 2012 -0700
+++ b/hotspot/src/cpu/sparc/vm/c1_LIRAssembler_sparc.cpp	Tue Oct 09 10:11:38 2012 +0200
@@ -105,6 +105,11 @@
         if (src->is_address() && !src->is_stack() && (src->type() == T_OBJECT || src->type() == T_ARRAY)) return false;
       }
 
+      if (UseCompressedKlassPointers) {
+        if (src->is_address() && !src->is_stack() && src->type() == T_ADDRESS &&
+            src->as_address_ptr()->disp() == oopDesc::klass_offset_in_bytes()) return false;
+      }
+
       if (dst->is_register()) {
         if (src->is_address() && Assembler::is_simm13(src->as_address_ptr()->disp())) {
           return !PatchALot;
@@ -969,8 +974,19 @@
 #endif
         }
         break;
-      case T_METADATA:
-      case T_ADDRESS:  __ ld_ptr(base, offset, to_reg->as_register()); break;
+      case T_METADATA:  __ ld_ptr(base, offset, to_reg->as_register()); break;
+      case T_ADDRESS:
+        if (offset == oopDesc::klass_offset_in_bytes()) {
+          __ lduw(base, offset, to_reg->as_register());
+#ifdef _LP64
+          if (UseCompressedKlassPointers) {
+            __ decode_klass_not_null(to_reg->as_register());
+          }
+#endif
+        } else {
+          __ ld_ptr(base, offset, to_reg->as_register());
+        }
+        break;
       case T_ARRAY : // fall through
       case T_OBJECT:
         {
@@ -2344,7 +2360,7 @@
     if (UseCompressedKlassPointers) {
       // tmp holds the default type. It currently comes uncompressed after the
       // load of a constant, so encode it.
-      __ encode_heap_oop(tmp);
+      __ encode_klass_not_null(tmp);
       // load the raw value of the dst klass, since we will be comparing
       // uncompressed values directly.
       __ lduw(dst, oopDesc::klass_offset_in_bytes(), tmp2);