Subject: Re: Data format compatibility: old NetBSD/arm32, NetBSD/arm 26 vs. 32 bit
To: David Laight <>
From: Jason R Thorpe <>
List: port-arm
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 <>