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manual: logb(x) is floor(log2(fabs(x)))

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log2(3) doesn't accept negative input, but it seems logb(3) does accept
it.

Link: <https://lore.kernel.org/linux-man/ZeYKUOKYS7G90SaV@debian/T/#u>
Reported-by: Morten Welinder <mwelinder@gmail.com>
Reviewed-by: DJ Delorie <dj@redhat.com>
Cc: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
Cc: Vincent Lefevre <vincent@vinc17.net>
Cc: Paul Zimmermann <Paul.Zimmermann@inria.fr>
Cc: Andreas Schwab <schwab@linux-m68k.org>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
This commit is contained in:
Alejandro Colomar 2024-03-31 22:38:39 +02:00 committed by Adhemerval Zanella
parent 4dcd674b66
commit b7d15bd1f0
1 changed files with 1 additions and 1 deletions
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manual/math.texi
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@ -561,7 +561,7 @@ These functions return the base-2 logarithm of @var{x}.
@safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}} @safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}}
These functions extract the exponent of @var{x} and return it as a These functions extract the exponent of @var{x} and return it as a
floating-point value. If @code{FLT_RADIX} is two, @code{logb} is equal floating-point value. If @code{FLT_RADIX} is two, @code{logb} is equal
to @code{floor (log2 (x))}, except it's probably faster. to @code{floor (log2 (fabs (x)))}, except it's probably faster.
If @var{x} is de-normalized, @code{logb} returns the exponent @var{x} If @var{x} is de-normalized, @code{logb} returns the exponent @var{x}
would have if it were normalized. If @var{x} is infinity (positive or would have if it were normalized. If @var{x} is infinity (positive or