From: Alejandro Colomar <alx@kernel.org>
Date: Mon, 4 Mar 2024 23:20:09 +0000 (+0100)
Subject: logb.3: logb(x) is floor(log2(fabs(x)))
X-Git-Tag: man-pages-6.7~52
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=cf26f5ed31472bd4b960620dc9618eb5089dbef3;p=thirdparty%2Fman-pages.git

logb.3: 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>
Cc: Adhemerval Zanella Netto <adhemerval.zanella@linaro.org>
Cc: Vincent Lefevre <vincent@vinc17.net>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
---

diff --git a/man3/logb.3 b/man3/logb.3
index 7cbb2470a..7a1ad2f4a 100644
--- a/man3/logb.3
+++ b/man3/logb.3
@@ -58,7 +58,7 @@ If
 is 2,
 .BI logb( x )
 is equal to
-.BI floor(log2( x ))\fR,
+.BI floor(log2(fabs( x )))\f[R],\f[]
 except that it is probably faster.
 .P
 If