$ diff -u test_uint.s test_int.s 
--- test_uint.s 2006-08-28 13:12:43.000000000 +0200
+++ test_int.s  2006-08-28 13:13:35.000000000 +0200
@@ -1,4 +1,4 @@
-       .file   "test_uint.c"
+       .file   "test_int.c"
        .section        .rodata
 .LC0:
        .string "abcdef"
@@ -22,7 +22,7 @@
        movl    $1, -4(%rbp)
        movl    -4(%rbp), %eax
        negl    %eax
-       mov     %eax, %eax
+       cltq
        addq    -16(%rbp), %rax
        movb    $121, (%rax)
        movq    -24(%rbp), %rdi