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Re: real128 cmplx ATAN, ATANH - quality of implementation?

From: Steve Kargl <sgk at troutmask dot apl dot washington dot edu>
To: Dan Nagle <danlnagle at me dot com>
Cc: FX <fxcoudert at gmail dot com>, mexas at bris dot ac dot uk, fortran at gcc dot gnu dot org
Date: Sat, 4 Feb 2017 16:12:18 -0800
Subject: Re: real128 cmplx ATAN, ATANH - quality of implementation?
Authentication-results: sourceware.org; auth=none
References: <201702031345.v13DjEQ5001217@mech-as222.men.bris.ac.uk> <F69FD8A4-F37D-4586-89D7-DC8079D1C471@gmail.com> <20170203153503.GB62087@troutmask.apl.washington.edu> <4A0E2BB9-211D-4D4A-8BBF-17406EE578F3@gmail.com> <20170203210254.GA86818@troutmask.apl.washington.edu> <B413638F-F545-4EDA-A32E-20E838091980@me.com> <20170203234012.GA84134@troutmask.apl.washington.edu>
Reply-to: sgk at troutmask dot apl dot washington dot edu

On Fri, Feb 03, 2017 at 03:40:12PM -0800, Steve Kargl wrote:
> 
> But, seriously, thanks for the input Dan.  I'll defer to FX
> here as I'm changing code he wrote.  In particular, if the
> routine does not find a suitable real kind type value, it 
> will then return -1 or -2.  I don't know what -2 is signalling
> to the compiler.   

After reading the F2008 standard, I now know what -2 means.  I
think gfortran will never return -2, but I've left the code that
checks for it.  I'll submit a patch later tonight.

-- 
Steve
20170204 https://www.youtube.com/watch?v=dYfs-eS0fBM
20161221 https://www.youtube.com/watch?v=IbCHE-hONow

References:
- real128 cmplx ATAN, ATANH - quality of implementation?
  - From: Anton Shterenlikht
- Re: real128 cmplx ATAN, ATANH - quality of implementation?
  - From: FX
- Re: real128 cmplx ATAN, ATANH - quality of implementation?
  - From: Steve Kargl
- Re: real128 cmplx ATAN, ATANH - quality of implementation?
  - From: FX
- Re: real128 cmplx ATAN, ATANH - quality of implementation?
  - From: Steve Kargl
- Re: real128 cmplx ATAN, ATANH - quality of implementation?
  - From: Dan Nagle
- Re: real128 cmplx ATAN, ATANH - quality of implementation?
  - From: Steve Kargl

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