--- old/src/cpu/x86/vm/x86_32.ad	2015-04-15 12:34:16.773783980 +0200
+++ new/src/cpu/x86/vm/x86_32.ad	2015-04-15 12:34:16.625779004 +0200
@@ -1209,8 +1209,7 @@
     return impl_helper(cbuf,do_size,true ,ra_->reg2offset(src_second),dst_second,0x8B,"MOV ",size, st);
 
 
-  Unimplemented();
-  return 0; // Mute compiler
+  fatal("Unimplemented");
 }
 
 #ifndef PRODUCT