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(Normalization Functions): Remove duplicated description of logb.

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This commit is contained in:
Ulrich Drepper 2001-07-19 14:18:08 +00:00
parent e968f23e06
commit b7d03293a7
1 changed files with 2 additions and 27 deletions
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29
manual/arith.texi
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@ -1262,33 +1262,8 @@ For example, @code{ldexp (0.8, 4)} returns @code{12.8}.
@end deftypefun
The following functions, which come from BSD, provide facilities
equivalent to those of @code{ldexp} and @code{frexp}.
@comment math.h
@comment BSD
@deftypefun double logb (double @var{x})
@comment math.h
@comment BSD
@deftypefunx float logbf (float @var{x})
@comment math.h
@comment BSD
@deftypefunx {long double} logbl (long double @var{x})
These functions return the integer part of the base-2 logarithm of
@var{x}, an integer value represented in type @code{double}. This is
the highest integer power of @code{2} contained in @var{x}. The sign of
@var{x} is ignored. For example, @code{logb (3.5)} is @code{1.0} and
@code{logb (4.0)} is @code{2.0}.
When @code{2} raised to this power is divided into @var{x}, it gives a
quotient between @code{1} (inclusive) and @code{2} (exclusive).
If @var{x} is zero, the return value is minus infinity if the machine
supports infinities, and a very small number if it does not. If @var{x}
is infinity, the return value is infinity.
For finite @var{x}, the value returned by @code{logb} is one less than
the value that @code{frexp} would store into @code{*@var{exponent}}.
@end deftypefun
equivalent to those of @code{ldexp} and @code{frexp}. See also the
@w{ISO C} function @code{logb} which originally also appeared in BSD.
@comment math.h
@comment BSD