[PATCH] Update x86_64 ULPs

[Ondřej Bílka]

On Thu, May 02, 2013 at 02:55:20PM -0400, Carlos O'Donell wrote:
> On 05/02/2013 02:49 PM, Joseph S. Myers wrote:
> > On Thu, 2 May 2013, Ondrej Bilka wrote:
> > 
> >> Could we compute ulp directly with mpfr or I am missing some roadblock?
> > 
> > The whole point of ulps baselines is to record the errors produced by the 
> > actual glibc implementation, compared to an exact expected result (which 
> > quite likely was computed with MPFR).  Those baselines can, on x86 and 
> > x86_64, depend on the processor implementation of the x87 instructions for 
> > transcendental operations (so on whether an Intel or AMD processor is in 
> > use, for example), as well as, on 32-bit x86, on the details of where the 
> > compiler uses excess precision.
> >

So mpfr computations depend on processor used?
 
> > I've been thinking lately about how to better automate computation of the 
> > *expected results* with MPFR and MPC, but that won't remove the need for 
> > ulps values for the glibc implementations used on different platforms.
> 
> +1
>  
> Automating expected result computation would be great.
> 
> Cheers,
> Carlos.

-- 

SCSI's too wide.