Re: Endianness and Record Specification

[Robin Vowels <robin.vowels@gmail.com>]

On Sep 22, 7:59 pm, "Dmitry A. Kazakov" <mail...@dmitry-kazakov.de>
wrote:
> On Sat, 22 Sep 2012 02:32:17 -0700 (PDT), Robin Vowels wrote:
> > This won't help your problem, but
> > PL/I bit strings are stored in correct order regardless
> > of big-endian or little-endian machine on which the program runs.
> > The memory image is identical for both machine types.
>
> This does not make any sense.
>
> 1. Anything a language stores it does in the correct order, unless the
> compiler in broken. Just per definition, the correct order is the order
> used by the language.

I pointed out that in PL/I the order in which the bits are stored
is the same regardless of endian-ness.
Endian-ness came many years after the introduction of PL/I.

It shouldn't be an issue with Ada either.

> 2. As for logical order of bits, that depends exclusively on the hardware.
> As an example consider an A/D converter card which maps its registers onto
> certain physical addresses of the host machine. The compiler has no
> whatsoever influence on the bit, byte, word etc orders of the register as
> perceived by the host machine hardware.

That isn't relevant in determining the endian-ness.
An A-D converter isn't the processor, it's an attachment.