Let's get moving

Steve Kargl sgk at troutmask.apl.washington.edu
Tue Jun 2 00:40:37 UTC 2015

On Mon, Jun 01, 2015 at 11:32:29PM +0000, Montgomery-Smith, Stephen wrote:
> Hey people,
> I was looking at https://wiki.freebsd.org/Numerics, and we are stalling.

The wiki is out-of-date.  I've committed patches for erfcl, erfl,
and lgammal.  I'm working on powl and I'll do tgammal after I get
powl done.  I have versions of sincos[fl], which aren't quite ready,
but I would like to have available for my work on the Bessel functions.

> For example, we have working code for clog and clogf - why don't we
> commit it?
> One of the reasons I bring this up is I would like to create a port for
> http://librsb.sourceforge.net/, and the only barriers are the lack of
> cpowf and cpow.  Right now I intend to commit it with a rather
> simplistic patch:

>From src/math_private.h

 * The C99 standard intends x+I*y to be used for this, but x+I*y is
 * currently unusable in general since gcc introduces many overflow,
 * underflow, sign and efficiency bugs by rewriting I*y as
 * (0.0+I)*(y+0.0*I) and laboriously computing the full complex product.
 * In particular, I*Inf is corrupted to NaN+I*Inf, and I*-0 is corrupted
 * to -0.0+I*0.0.

Last time I checked, clang was even worse with regards to I.


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