MIN/MAX and trapping math and NANs

[Joseph Myers]

On Tue, 11 Apr 2023, Michael Matz via Gcc wrote:

> Note that this makes minNum/maxNum (and friends) not associative.  Also, 
> different languages and different hardware implement fmin/fmax different 
> and sometimes in conflict with 754-2008 (e.g. on SSE2 maxsd isn't 
> commutative but maxNum is!).  This can be considered a defect in 754-2008.  
> As result these operations were demoted in 754-2019 and new functions 
> minimumNumber (and friends) recommended (those propagate a qNaN).

Yes.  fmax/fmin correspond to the IEEE 754-2008 operations.  C2x has new 
functions corresponding to the IEEE 754-2019 operations.

-- 
Joseph S. Myers
joseph@codesourcery.com