diff -r 58f23871a5b6 -r d2c37eee9a65 hotspot/src/cpu/x86/vm/assembler_x86.cpp
--- a/hotspot/src/cpu/x86/vm/assembler_x86.cpp	Thu Apr 08 10:55:40 2010 +0200
+++ b/hotspot/src/cpu/x86/vm/assembler_x86.cpp	Thu Apr 08 12:13:07 2010 -0700
@@ -3365,6 +3365,13 @@
 
 #else // LP64
 
+void Assembler::set_byte_if_not_zero(Register dst) {
+  int enc = prefix_and_encode(dst->encoding(), true);
+  emit_byte(0x0F);
+  emit_byte(0x95);
+  emit_byte(0xE0 | enc);
+}
+
 // 64bit only pieces of the assembler
 // This should only be used by 64bit instructions that can use rip-relative
 // it cannot be used by instructions that want an immediate value.