[PATCH v2 2/3] manual: floor(log2(fabs(x))) has rounding errors

[DJ Delorie]

Alejandro Colomar <alx@kernel.org> writes:

> -floating-point value.  If @code{FLT_RADIX} is two, @code{logb} is equal
> -to @code{floor (log2 (fabs (x)))}, except
> -it's probably faster.

> +floating-point value.  If @code{FLT_RADIX} is two, @code{logb (x)} is similar
> +to @code{floor (log2 (fabs (x)))}, except
> +that the latter may give an incorrect integer due to intermediate rounding.

So we're replacing "is equal to" with "is similar to", and replacing
"it's probably faster" (understatement ;) with a note about correctness.

I can't think of a different description that is both more correct and
more succinct, nor do I think it's worth the effort to try to come up
with such.

LGTM.
Reviewed-by: DJ Delorie <dj@redhat.com>

Also, if you could avoid unnecessary reformating, that would help with
reviews.  Thanks!