Help with testing 4.1.3

Scott Bucholtz linuxman at
Sun Apr 25 05:32:32 CEST 2004

This seems like the same problem I'm having. 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> 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.
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Scott Bucholtz
IT System Engineer for Research and Development
Honeywell FM&T/NM
work:   (505) 661-8496
cell:   (505) 570-3000

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