complex arc-trig etc

Stephen Montgomery-Smith stephen at
Sat Dec 29 03:37:28 UTC 2012

On 12/28/2012 09:19 PM, Steve Kargl wrote:
> On Fri, Dec 28, 2012 at 08:24:52PM -0600, Stephen Montgomery-Smith wrote:
>> On 12/17/2012 02:38 AM, Bruce Evans wrote:
>>> On Sun, 16 Dec 2012, Stephen Montgomery-Smith wrote:
>>>> Hey guys, my complex arc-trig functions at
>>>> have been sitting there a long time.
>>>> Anyone want to commit them?
>>> I was sort of waiting for the next rounds of changes:
>>> 1. update the template to give similar code for float and long double
>>> 2. make it work for i386 using ENTERI()
>> What is ENTERI()?
> For 'long double' on i386, the precision is
> set to 53 bits in the kernel (see the file
> sys/x86/include/fpu.h).  ENTERI() toggles
> the fpu control word to use 64 bits for 
> long double and you use RETURNI() instead
> of 'return(val)' to return from the function.
> You can see these being used in msun/src/ld80/
> s_expl.c.  Also, note the ENTERI() and RETURNI()
> are defined in msun/src/math_private.h.
> Bruce can probably give a better explanation
> and the history.

Now I see why I couldn't find it.  It is only in CURRENT.  (I had
grepped the whole of source, but I am still in the dark ages of FreeBSD-8.)

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