On Tue, Sep 29, 2015 at 10:31:29AM -0700, Dmitriy Cherkasov wrote:
>
>
> On 09/29/2015 05:54 AM, Jorge Ramirez Ortiz wrote:
> > On 09/28/2015 08:12 PM, Gilles Chanteperdrix wrote:
> >> On Mon, Sep 28, 2015 at 04:57:28PM -0700, Dmitriy Cherkasov wrote:
> >> Ok, this page:
> >> http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.den0024a/CJHECGIH.html
> >>
> >> seems to indicate that armv8 may or may not trap upon
> >> exception. Or maybe the exceptions can be enabled with the FPCR
> >> register? Or the glibc functions defined in the fenv.h header?
> >>
> > the way it is worded it appears to be a decision left to the SoC vendor.
> > I'll post the question to [email protected] for confirmation.
> >
> From some earlier docs, it looks like it was possible to toggle
> trapping with FPCR, but as Lennart mentioned those bits appear to now be
> reserved. On our hardware, setting them has no effect.
>
>
> I also enjoyed this part:
>
> Both floating-point and NEON are required in all standard ARMv8
> implementations. However, implementations targeting specialized markets
> may support the following combinations:
>
> *
>
> No NEON or floating-point
Well, I guess there is a difference between "standard" and
"implementation targeting specialized markets".
--
Gilles.
https://click-hack.org
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