On Wed, Mar 13, 2019 at 01:00:58PM +0000, Joseph Myers wrote:
> > Yeah, an alias doesn't really cost much, and has the advantage that if in
> > the vector version you need at some point to differentiate between the
> > finite only vs. full implementations, you can just by tweaking libmvec
> > implementation, the callers will have proper calls depending on if they were
> > compiled with -Ofast or -O3 etc.
>
> Experience is showing that some or all of the finite-only versions in
> glibc were mistaken premature optimization - that proper optimized
> implementations do not gain anything from adding a finite-only
> restriction. There is no good basis to suppose that if additional
> variants of the vector functions were useful in future, finite-only would
> be the right conditional (or that the right set of variants would be the
> same as the right set of variants for scalar functions).
If the finite only doesn't buy anything, then another option is to drop the
math-finite.h stuff or portions thereof.
But adding a new GCC extension that other compilers will need to implement
too, instead of just adding a couple of aliases seems to be overkill to me.
Jakub
