Subject: Re: Data format compatibility: old NetBSD/arm32, NetBSD/arm 26 vs. 32 bit
To: David Laight <email@example.com>
From: Jason R Thorpe <firstname.lastname@example.org>
Date: 10/29/2002 07:23:27
On Tue, Oct 29, 2002 at 03:04:38PM +0000, David Laight wrote:
> > No, but the only change I'm aware of is that double-precision floating
> > point numbers are stored with native word-order rather than with
> > big-endian word order and native byte order within words.
> Ah - so they are now not in the ARM 'native' format for 64bit
> FP values? (IIRC one of the early arm cpus had hardware FP that used
> this mixed byte order.)
Well, there are two ARM "native" FP formats. FPA and VFP (the latter is
new in ARMv5).
In FPA, the words of a double are always in big-endian order. In VFP,
they're always in memory order.
-- Jason R. Thorpe <email@example.com>