Re: 8 bit cpu

From	Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups	comp.lang.c
Subject	Re: 8 bit cpu
Date	2025-12-23 19:35 -0800
Organization	None to speak of
Message-ID	<87cy448sd4.fsf@example.invalid> (permalink)
References	<d4h8kk5jltr9t2hqq0m471tlflmnin97ln@4ax.com> <10ifejl$mj2o$1@dont-email.me>

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kalevi@kolttonen.fi (Kalevi Kolttonen) writes:
[...]
> I do not know whether C standards permit 8-bit ints,

It does not.  C (up to C17) requires INT_MIN to be -32767 or lower,
and INT_MAX to be +32767 or higher.  (C23 changes the requirement
for INT_MIN from -32767 to -32768, and mandates 2's-complement for
signed integer types.)

>                                                      but
> cc65 is a real-world 6502 C cross-compiler available straight
> from the standard repositories on Fedora Linux 43 and FreeBSD 15.
>
> We can install cc65 and VICE emulator to do a simple test:
[...]

I have cc65 on my Ubuntu system.  Here's how I demonstrated the same
thing (that sizeof (int) is 2):

$ cat c.c
int SIZEOF_INT = sizeof (int);
$ cc65 c.c
$ cat c.s
;
; File generated by cc65 v 2.18 - Ubuntu 2.19-1
;
	.fopt		compiler,"cc65 v 2.18 - Ubuntu 2.19-1"
	.setcpu		"6502"
[7 lines deleted]
	.export		_SIZEOF_INT

.segment	"DATA"

_SIZEOF_INT:
	.word	$0002

$

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
void Void(void) { Void(); } /* The recursive call of the void */

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8 bit cpu Rosario19 <Ros@invalid.invalid> - 2025-12-18 19:20 +0100
  Re: 8 bit cpu Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2025-12-18 20:03 +0000
    Re: 8 bit cpu Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2025-12-18 20:49 +0000
  Re: 8 bit cpu BGB <cr88192@gmail.com> - 2025-12-18 16:30 -0600
    Re: 8 bit cpu Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-18 15:36 -0800
      Re: 8 bit cpu Richard Heathfield <rjh@cpax.org.uk> - 2025-12-19 01:12 +0000
      Re: 8 bit cpu Kaz Kylheku <046-301-5902@kylheku.com> - 2025-12-20 19:23 +0000
        Re: 8 bit cpu Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-20 17:55 -0800
          Re: 8 bit cpu David Brown <david.brown@hesbynett.no> - 2025-12-21 13:12 +0100
            Re: 8 bit cpu Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-21 16:14 -0800
              Re: 8 bit cpu David Brown <david.brown@hesbynett.no> - 2025-12-22 08:41 +0100
    Re: 8 bit cpu David Brown <david.brown@hesbynett.no> - 2025-12-19 09:49 +0100
    Re: 8 bit cpu Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-20 22:24 +0000
  Re: 8 bit cpu David Brown <david.brown@hesbynett.no> - 2025-12-19 09:19 +0100
    Re: 8 bit cpu bart <bc@freeuk.com> - 2025-12-19 13:43 +0000
      Re: 8 bit cpu David Brown <david.brown@hesbynett.no> - 2025-12-19 16:16 +0100
        Re: 8 bit cpu bart <bc@freeuk.com> - 2025-12-19 16:05 +0000
          Re: 8 bit cpu David Brown <david.brown@hesbynett.no> - 2025-12-19 18:57 +0100
            Re: 8 bit cpu bart <bc@freeuk.com> - 2025-12-20 16:19 +0000
              Re: 8 bit cpu David Brown <david.brown@hesbynett.no> - 2025-12-20 18:29 +0100
  Re: 8 bit cpu Kaz Kylheku <046-301-5902@kylheku.com> - 2025-12-20 19:16 +0000
  Re: 8 bit cpu kalevi@kolttonen.fi (Kalevi Kolttonen) - 2025-12-24 01:11 +0000
    Re: 8 bit cpu Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-23 19:35 -0800
      Re: 8 bit cpu BGB <cr88192@gmail.com> - 2025-12-24 03:19 -0600

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