diff -r 0dc88ad3244e -r 6476042f815c src/cpu/x86/vm/stubGenerator_x86_64.cpp
--- a/src/cpu/x86/vm/stubGenerator_x86_64.cpp	Tue Apr 06 15:18:10 2010 -0700
+++ b/src/cpu/x86/vm/stubGenerator_x86_64.cpp	Wed Apr 07 09:37:47 2010 -0700
@@ -871,9 +871,8 @@
   }
 
   address generate_fp_mask(const char *stub_name, int64_t mask) {
+    __ align(CodeEntryAlignment);
     StubCodeMark mark(this, "StubRoutines", stub_name);
-
-    __ align(16);
     address start = __ pc();
 
     __ emit_data64( mask, relocInfo::none );
@@ -1268,7 +1267,7 @@
                              Label& L_copy_32_bytes, Label& L_copy_8_bytes) {
     DEBUG_ONLY(__ stop("enter at entry label, not here"));
     Label L_loop;
-    __ align(16);
+    __ align(OptoLoopAlignment);
   __ BIND(L_loop);
     if(UseUnalignedLoadStores) {
       __ movdqu(xmm0, Address(end_from, qword_count, Address::times_8, -24));
@@ -1309,7 +1308,7 @@
                               Label& L_copy_32_bytes, Label& L_copy_8_bytes) {
     DEBUG_ONLY(__ stop("enter at entry label, not here"));
     Label L_loop;
-    __ align(16);
+    __ align(OptoLoopAlignment);
   __ BIND(L_loop);
     if(UseUnalignedLoadStores) {
       __ movdqu(xmm0, Address(from, qword_count, Address::times_8, 16));
@@ -2229,7 +2228,7 @@
     // Loop control:
     //   for (count = -count; count != 0; count++)
     // Base pointers src, dst are biased by 8*(count-1),to last element.
-    __ align(16);
+    __ align(OptoLoopAlignment);
 
     __ BIND(L_store_element);
     __ store_heap_oop(to_element_addr, rax_oop);  // store the oop