On Jan 30, 2011, at 4:07 PM, Jonathan Wakely wrote:
> On 30 January 2011 21:02, Amittai Aviram wrote:
>>
>> I tried it with strncpy and with __builtin_strncpy, with exactly the same results, i.e., the assembly code still calls strncpy with three arguments.
>
> Did you enable optimization?
I hadn't and that did it--even with just "-O1." Thank you! Very interesting!—
movl $1280066888, (%rsp)
movw $79, 4(%rsp)
The first integer in hex is 4C 4C 45 48 ( == 'L','L','E','H')
and the second (79) is 4F ( == 'O')
So, of course, it works out when assigned in little-endian order. The second assignment also puts NULL in the right place as the higher-order bits of the integer 79.
Amittai Aviram
PhD Student in Computer Science
Yale University
646 483 2639
amittai.aviram@xxxxxxxx
http://www.amittai.com
