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Re: Expansion of narrowing math built-ins into power instructions


On Wed, 14 Aug 2019, Segher Boessenkool wrote:

> Does something like
>   float d; double a, b, x;
>   ...
>   d = fadd (a + x, b - x);
> work as wanted, with such a representation?  It would simplify (does it?) to
>   d = fadd (a, b);
> but is that allowed?

It's not allowed, but neither is simplifying (a + x) + (b - x) into (a + 
b), when contraction isn't allowed.

-- 
Joseph S. Myers
joseph@codesourcery.com


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