what about a PDP 8 or PDP 15, could we not code for it? being 12
and 18 bit machines?
Steve
On Jul 30, 2008, at 8:36 AM, Dave Hansen wrote:
From: [EMAIL PROTECTED]
> 2008/7/14 Weddington, Eric <[EMAIL PROTECTED]>:
> > A 24-bit integer is not supported by the C language. In theory,
support
> > could be added to GCC, but then it would be considered an
extension to
> > the C language. And it would also be difficult and/or time-
consuming to
> > add to GCC.
>
> The C standard doesn't dictate the size of any integer type,
except that char
> must be large enough to hold the environments standard character
set and
> the size of any larger types is ordered as you'd expect.
> char <= short <= int <= long
Also that short and int must be able to represent at least -32767 to
+32767, and long must be able to represent +/-2,147,483,647. So
int24_t would have to be a special type outside the standard types.
And I think (though I'm not certain) that it would have to be
promoted to long before any operator could be applied. Some of that
would be mitigated by the as-if rule, of course...
> int is typically the natural word size for the architecture, but
often on 8 bit
> micros it will be larger (since char typically provides an 8 bit
int anyway.)
It's larger because an 8 bits can't represent the required range of
values.
Regards,
-=Dave
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