linux-kernel - Re: __LITTLE_ENDIAN vs. __LITTLE_ENDIAN

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Message-ID: <jezlyxmfbx.fsf@sykes.suse.de>
Date:	Fri, 05 Oct 2007 23:17:22 +0200
From:	Andreas Schwab <schwab@...e.de>
To:	Timur Tabi <timur@...escale.com>
Cc:	Jan Engelhardt <jengelh@...putergmbh.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: __LITTLE_ENDIAN vs. __LITTLE_ENDIAN_BITFIELD

Timur Tabi <timur@...escale.com> writes:

> Then I don't understand that point of defining __LITTLE_ENDIAN_BITFIELD.
> What does it mean for a C-level bitfield ordering to be little-endian if
> the processor is BIG_ENDIAN?

Byte endianess and bit endianness are orthogonal concecpts.  A cpu can
have insns using both little and big endian bit addressing (btst
vs. bftst on m68k).  The bitfield ordering is a property of the ABI and
may even be different from how the cpu numbers the bits in its ISA.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@...e.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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