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Re: [Qemu-devel] [PATCH] pcnet32 driver change, please test
From: |
Paul Brook |
Subject: |
Re: [Qemu-devel] [PATCH] pcnet32 driver change, please test |
Date: |
Sat, 3 Mar 2007 01:01:55 +0000 |
User-agent: |
KMail/1.9.5 |
> : I find this curious... C99 (6.7.2.1) says "the allocation order of
> : bit-fields within a unit (high-order to low-order or low-order to
> : high-order) is implementation defined". I can't see any requirement
> : for this, so is it just convention that bitfields on big endian systems
> : start from the most significant bit, and those on little endian systems
> : start from the least significant bit? (My thinking is that endianness
> : usually refers to byte ordering and not so much bit ordering.)
>
> This is a convention that goes back a very long ways. It was this way
> in the mid 1980's, and has remained true through today. I've
> personally observed this to be the case on many different MIPS
> compilers, ARM compilers and SPARC compilers over the years.
I'm fairly sure I've seen targets that use other bitfield orderings, though I
can't remember offhand what they were.
Paul
- [Qemu-devel] [PATCH] pcnet32 driver change, please test, Thiemo Seufer, 2007/03/02
- Re: [Qemu-devel] [PATCH] pcnet32 driver change, please test, Thiemo Seufer, 2007/03/02
- Re: [Qemu-devel] [PATCH] pcnet32 driver change, please test, Stuart Brady, 2007/03/02
- Re: [Qemu-devel] [PATCH] pcnet32 driver change, please test, M. Warner Losh, 2007/03/02
- Re: [Qemu-devel] [PATCH] pcnet32 driver change, please test,
Paul Brook <=
- Re: [Qemu-devel] [PATCH] pcnet32 driver change, please test, M. Warner Losh, 2007/03/02
- Re: [Qemu-devel] [PATCH] pcnet32 driver change, please test, Andreas Schwab, 2007/03/03
- Re: [Qemu-devel] [PATCH] pcnet32 driver change, please test, M. Warner Losh, 2007/03/03
- Re: [Qemu-devel] [PATCH] pcnet32 driver change, please test, Andreas Schwab, 2007/03/03
- Re: [Qemu-devel] [PATCH] pcnet32 driver change, please test, M. Warner Losh, 2007/03/03
- Re: [Qemu-devel] [PATCH] pcnet32 driver change, please test, Andreas Schwab, 2007/03/03