Re: hf/sf [Was Re: CVS commit: pkgsrc/misc/raspberrypi-userland]

[Warner Losh <imp%bsdimp.com@localhost>]

On Nov 11, 2013, at 4:31 PM, Justin Cormack wrote:

> On Mon, Nov 11, 2013 at 10:56 PM, Michael van Elst 
> <mlelstv%serpens.de@localhost> wrote:
>> matt%3am-software.com@localhost (Matt Thomas) writes:
>> 
>>> Exactly.  with hf, floating point values are passed in floating point
>>> registers.  That can not be hidden via a library (this works on x86
>>> since the stack has all the arguments).
>> 
>> It could be hidden by emulating the floating point hardware.
> 
> Thats not sane. The slowdown would be enormous. You are emulating
> registers as well as operations.

Is there a complete write up of the conventions here?

Warner