This is the mail archive of the
libc-ports@sources.redhat.com
mailing list for the libc-ports project.
Re: fma ulps
On Wed, 30 May 2012, Chris Metcalf wrote:
> > fma isn't meant to have ulps.
>
> Just to confirm, I did record some 1-ulp results for tile, but only because
> the rounding-mode support doesn't exist. Presumably in that case it's
> still better to list ulps than to let the test fail?
Given that you know the cause, and that there is an open bug for the
issue, yes. But I don't think it's a good idea to add ulps for such
functions with fully-defined results without at least having the open bug
- and in the alpha case, there is a plausible cause that may not be hard
to fix (needing to build s_fma.c, s_fmaf.c and s_fmal.c with
-mieee-with-inexact).
--
Joseph S. Myers
joseph@codesourcery.com