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| author | Alejandro Colomar <alx@kernel.org> | 2024-03-31 22:38:39 +0200 |
|---|---|---|
| committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2024-04-03 09:16:22 -0300 |
| commit | b7d15bd1f00ae3f941150c9e49e65fbc6595adda (patch) | |
| tree | dca542182c82334eb9295ee221f2ff806d553a84 | |
| parent | 4dcd674b66bb0529019908ea9a08748e005edeb7 (diff) | |
| download | glibc-b7d15bd1f00ae3f941150c9e49e65fbc6595adda.tar.gz glibc-b7d15bd1f00ae3f941150c9e49e65fbc6595adda.tar.xz glibc-b7d15bd1f00ae3f941150c9e49e65fbc6595adda.zip | |
manual: logb(x) is floor(log2(fabs(x)))
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>
| -rw-r--r-- | manual/math.texi | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/manual/math.texi b/manual/math.texi index 2f6ee253b9..c54eaebb65 100644 --- a/manual/math.texi +++ b/manual/math.texi @@ -561,7 +561,7 @@ These functions return the base-2 logarithm of @var{x}. @safety{@prelim{}@mtsafe{}@assafe{}@acsafe{}} 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 -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} would have if it were normalized. If @var{x} is infinity (positive or |