Implement C23 pown [committed]

[Vincent Lefevre]

On 2025-06-03 11:09:07 -0500, Segher Boessenkool wrote:
> The commit message clearly says this implementation isd correct for
> IEEE float only.  And indeed it is not for double-double, which is very
> much not IEEE.
> 
> Maybe these tests should require IEEE float?  The implementation does,
> after all!

Shouldn't this implementation rather be disabled with non-IEEE floats
(thus not just the tests), as it is not correct?

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Work: CR INRIA - computer arithmetic / Pascaline project (LIP, ENS-Lyon)