Help with testing 4.1.3

[Scott Bucholtz]

This seems like the same problem I'm having.  mpfr.org reports a 
bug-fixed sqrt() function but that is for (I believe) the newest version 
of MPFR (and not for the one distributed with GMP-4.1.2.  Can we upgrade 
all of MPFR to the latest version for 4.1.3 to elevate these problems?


On Sun, 25 Apr 2004, Kevin Ryde wrote:

> Laurent Fousse <laurent at fousse.info> writes:
> >
> > | mpfr_sqrt_ui differs from sqrt for a=891885598, rnd_mode=GMP_RNDZ
> > | sqrt gives 0x1.d2a1d0a4c79b2p+14, mpfr_sqrt_ui gives 
> > | 0x1.d2a1d0a4c79b1p+14 (-1 ulp)
> 
> Looks like it's sqrt() which is wrong.  By my reckoning the root is
> 1D2A1D0A4C79B1FFD1... which rounded to zero should be ...b1 as per
> mpf_sqrt_ui rather than ...b2 per sqrt().
> 
> Assuming fesetround has done it's job then it looks like sqrt is
> either broken or not meant to obey the hardware rounding mode.  Such
> is the folly of relying on exact answers from the math library :-(.
> I'll disable that test.
> _______________________________________________
> gmp-devel mailing list
> gmp-devel at swox.com
> https://gmplib.org/mailman/listinfo/gmp-devel
> 


Scott Bucholtz
IT System Engineer for Research and Development
Honeywell FM&T/NM
work:   (505) 661-8496
cell:   (505) 570-3000