diff -r a49a647afe9a -r ba764ed4b6f2 src/cpu/sparc/vm/vm_version_sparc.cpp
--- a/src/cpu/sparc/vm/vm_version_sparc.cpp	Fri Apr 11 09:56:35 2008 -0400
+++ b/src/cpu/sparc/vm/vm_version_sparc.cpp	Sun Apr 13 17:43:42 2008 -0400
@@ -64,6 +64,15 @@
     if (FLAG_IS_DEFAULT(UseInlineCaches)) {
       UseInlineCaches         = false;
     }
+#ifdef _LP64
+    // Single issue niagara1 is slower for CompressedOops
+    // but niagaras after that it's fine.
+    if (!is_niagara1_plus()) {
+      if (FLAG_IS_DEFAULT(UseCompressedOops)) {
+        FLAG_SET_ERGO(bool, UseCompressedOops, false);
+      }
+    }
+#endif // _LP64
 #ifdef COMPILER2
     // Indirect branch is the same cost as direct
     if (FLAG_IS_DEFAULT(UseJumpTables)) {