Re: earmv6hf IEEE754 underflow problem

[Tobias Nygren <tnn%NetBSD.org@localhost>]

On Mon, 23 Feb 2015 20:42:23 +0100
Martin Husemann <martin%duskware.de@localhost> wrote:

> On Mon, Feb 23, 2015 at 08:38:36PM +0100, Tobias Nygren wrote:
> > Ah, I see. That explains the problem, thank you. But the BCM2835 VFP
> > hardware itself does have some exception support, doesn't it?
> 
> I don't know - that output was from a Cortex A7 CPU (and would probably
> be the same for RPi2), but I don't have a RPi myself.

The ARM1176JZF-S manual says

"The VFP supports all five floating point exceptions defined by the
IEEE 754 standard"

Also

rpi# dmesg |grep exceptions
vfp0 at cpu0: VFP11, rounding, exceptions

... but the userland does not have any of the fenv(3) stuff so
I suppose it's still missing some code. Maybe this would be a good
google SoC project?

Cheers,
-Tobias