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
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