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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.arch
Subject: Re: Byte Addressability And Beyond
Date: Sun, 5 May 2024 00:25:17 -0000 (UTC)
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On Thu, 2 May 2024 12:00:40 -0000 (UTC), John Levine wrote:

> ... it is easy to construct examples that appear to make your less
> favored option look wrong ...

Here is the issue: we have three different quantities needing numbering.

* Bit places within an integer
* Bit numbers within a bit field
* Byte numbers within a multibyte integer (offsets from the base address)

In little-endian, it is easy to relate all these three as follows:

    bit place within integer = bit number within bit field =
        byte number * 8 + bit within byte

There is no correspondingly simple formula for any big-endian 
architecture.