[Cfp-interest 1846] Re: fmax, fmin

[Jim Thomas]

> On Nov 3, 2020, at 11:42 AM, Fred J. Tydeman <tydeman at tybor.com> wrote:
> 
> I am not sure what I should be doing here about this item.

Is this for the action item:

    Fred: Write a paper to remove the fminfN/fmaxfN/fmindN/... functions from part 3 as an annex.

The action item seems fairly specific, and only pertains to the part 3 annex. Your last change below is about the action item.

I thought we had decided not to remove or obsolesce the fmax and fmin functions in the C23 draft (not including the part 3 annex).

We should replace use of fmax in G.5.1#8. Did you check that fmaximum is a good replacement, i.e., that fmaximum_num isn’t needed? It would be good to look for any other needed cleanup from adding the new max-min functions.

- Jim Thomas

> 
> Here is a first pass.  Comments welcome.
> 
> Background.
> 
> IEEE 754-2008 had minNum, minNumMag, maxNum, and maxNumMag operations.
> Some of these were added to C99 as fmin and fmax (based upon IEEE
> 754 work in progress???).
> 
> They have been replaced in IEEE 754-2019 with minimum, minimumNumber,
> maximum, and maximumNumber, minimumMagnitude, minimumMagnitudeNumber,
> maximumMagnitude, and maximumMagnitudeNumber.  These have been added
> to C23; some with shorter names.
> 
> WG14 N2573 C2x draft
> 
> 5.2.4.2.3#7: Maybe remove fmax and fmin from the Preferred quantum
> exponents table.
> 
> 7.12.12.2 fmax: Maybe add something like: These functions have been
> superseded by fmaximum.
> 
> Maybe add [[deprecated]] -- this is based upon: 164) In particular,
> deprecated is appropriate for names and entities that are obsolescent,
> insecure, unsafe, or otherwise unfit for purpose.
> 
> Remove fmaxd32, fmaxd64, fmaxd128.
> 
> 7.12.12.3 fmin: Maybe add something like: These functions have been
> superseded by fminimum.  Maybe add [[deprecated]].
> 
> Remove fmind32, fmind64, fmind128.
> 
> 7.25#15: Replace fmax with fmaximum in three places
> 
> 7.31.8: Maybe add something about fmin and fmax being obsolescent.
> 
> F.3#1: Remove fmax and fmin from the Operation binding table.
> 
> F.3#3:  Maybe add something like:  These functions have been
> superseded by fminimum and fmaximum.
> 
> F.10.9.2 fmax: ???
> F.10.9.3 fmin: ???
> 
> G.5.1#8: Replace fmax with fmaximum.
> 
> WG14 N2601 Part 3 as annex X
> 
> In 7.12.11 Manipulation functions, remove:
> fmaxfN
> fmaxfNx
> fmaxdN
> fmaxdNx
> 
> fminfN
> fminfNx
> fmindN
> fmindNx
> 
> 
> 
> ---
> Fred J. Tydeman        Tydeman Consulting
> tydeman at tybor.com      Testing, numerics, programming
> +1 (702) 608-6093      Vice-chair of PL22.11 (ANSI "C")
> Sample C99+FPCE tests: http://www.tybor.com
> Savers sleep well, investors eat well, spenders work forever.
> 
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