[Bug math/14803] Different ULPs depending on size of long int in GCC

[hjl.tools at gmail dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14803

--- Comment #4 from H.J. Lu <hjl.tools at gmail dot com> 2012-11-04 23:05:35 UTC ---
(In reply to comment #1)
>
> Really I'd consider this just a variant on bug 21718 (real.c rounding not 
> perfect).  That would ideally be fixed by using MPFR for this in GCC ... 
> except that for any MPFR versions before 3.1.1p2, the bug I found with the 
> ternary value from mpfr_strtofr could cause problems for subnormal 
> results.
> 

Fedora 17 has mpfr-3.1.0. So most of system MPFR won't be suitable for
this.

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