From: Andreas Schwab <schwab@suse.de>
To: Timur Tabi <timur@freescale.com>
Cc: Jan Engelhardt <jengelh@computergmbh.de>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: __LITTLE_ENDIAN vs. __LITTLE_ENDIAN_BITFIELD
Date: Fri, 05 Oct 2007 23:17:22 +0200 [thread overview]
Message-ID: <jezlyxmfbx.fsf@sykes.suse.de> (raw)
In-Reply-To: <47069982.9030009@freescale.com> (Timur Tabi's message of "Fri\, 05 Oct 2007 15\:07\:30 -0500")
Timur Tabi <timur@freescale.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@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."
next prev parent reply other threads:[~2007-10-05 21:17 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-10-05 18:27 __LITTLE_ENDIAN vs. __LITTLE_ENDIAN_BITFIELD Timur Tabi
2007-10-05 18:35 ` Jan Engelhardt
2007-10-05 19:35 ` Timur Tabi
2007-10-05 19:43 ` Jan Engelhardt
2007-10-05 19:47 ` Timur Tabi
2007-10-05 20:04 ` Andreas Schwab
2007-10-05 20:07 ` Timur Tabi
2007-10-05 20:34 ` linux-os (Dick Johnson)
2007-10-05 20:37 ` Timur Tabi
2007-10-05 23:27 ` Benjamin Herrenschmidt
2007-10-05 21:17 ` Andreas Schwab [this message]
2007-10-05 21:06 ` Anton Altaparmakov
2007-10-05 21:10 ` Timur Tabi
2007-10-05 21:29 ` Andreas Schwab
2007-10-05 21:32 ` Timur Tabi
2007-10-05 23:17 ` Andreas Schwab
2007-10-09 17:46 ` Lennart Sorensen
2007-10-09 17:56 ` Timur Tabi
2007-10-09 18:34 ` Lennart Sorensen
2007-10-09 18:50 ` Krzysztof Halasa
2007-10-09 18:57 ` Timur Tabi
2007-10-09 19:37 ` Krzysztof Halasa
2007-10-09 19:44 ` Timur Tabi
2007-10-09 22:11 ` Krzysztof Halasa
2007-10-09 19:11 ` Jeremy Fitzhardinge
2007-10-09 19:39 ` Krzysztof Halasa
2007-10-09 21:40 ` Jeremy Fitzhardinge
2007-10-09 22:34 ` Krzysztof Halasa
2007-10-10 12:05 ` linux-os (Dick Johnson)
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