diff -r 6dc5471e0f66 -r 85f13cdfbc1d src/cpu/x86/vm/assembler_x86.cpp
--- a/src/cpu/x86/vm/assembler_x86.cpp	Tue Dec 15 17:19:40 2009 -0800
+++ b/src/cpu/x86/vm/assembler_x86.cpp	Wed Dec 16 12:48:04 2009 +0100
@@ -7666,7 +7666,7 @@
 
 #ifdef ASSERT
   Label L;
-  testl(tmp, tmp);
+  testptr(tmp, tmp);
   jccb(Assembler::notZero, L);
   hlt();
   bind(L);