From: Spiro Trikaliotis (ml-cbmhackers_at_trikaliotis.net)
Date: 2004-12-10 07:18:46
Hello,
(just commenting on this part, as I've not read the other parts of this
thread:)
* On Thu, Dec 09, 2004 at 02:19:02PM -0600 Jim Brain wrote:
> The corner case is when the counter is at 65535 (for example), and it
> wraps, to 4095.
>
> 4095-65535 = -61440 -> (signed int) -4095 (I think...)
This would be +4096, not -4095:
-61440 = $FFF...FF1000; only getting the least 16 bits results in $1000,
thus, 4096.
Anyway, at least this is true for most compilers that I need. As soon as
you leave the range of your signed arithmetic, you loose the grounds of
ANSI C. In fact, the compiler can code this case like it wants; it could
even through an exception and terminate your program, or fill the
variable with some random number, or ...
But, as I told: You're right, the above is the behaviour I've seen on
all compilers I worked with so far.
Regards,
Spiro.
--
Spiro R. Trikaliotis
http://www.trikaliotis.net/
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