Re: questions on implementing long double

[Craig Howland <howland at LGSInnovations dot com>]

On 09/17/2014 11:02 AM, Marco Atzeri wrote:
> Hi,
> I am currently looking on how to implement the missing long double math
> functions; I am inclined to import the implementation from
> FreeDSB as it seems the most completed while the Netbsd
> lacks some functions.
What is FreeBSD lacking?  ("most completed" implies that something is missing.)  
Would you please send a path to where they have it? (In a quick look via the 
FreeBSD source web interface, it was not at all obvious to me where the math 
library stuff is.)
> As today we have a partial implementation for platform with
> _LDBL_EQ_DBL in libm/common
>
> ./libm/common/fabsl.c
>
> while normal implementation are usually in  libm/math
>
> ./libm/math/sf_fabs.c
> ./libm/math/s_fabs.c
>
> Assuming to merge the current and the FreeBSD, I think that
> the implementation should be moved to files with a name scheme
>
> libm/math/sl_fabs.c
>
> Does make sense ?
I think that the file names should reflect the function names, and not some 
legacy non-matching name that makes things more difficult to find (which is a 
current nuisance in the present files).  So, no, not sl_fabs.c, but fabsl.c.
> Additional question, except the case where in newlib
> _DOUBLE_IS_32BITS is defined, on FreeBSD there are two cases
>
>  LDBL_MANT_DIG == 64
>  LDBL_MANT_DIG == 113
>
> for 80bit and 128 bit.
> There are other LDBL_MANT_DIG values I should be aware on
> newlib platforms ?
>
> Regards
> Marco