diff options
Diffstat (limited to 'sysdeps/ieee754/logb.c')
-rw-r--r-- | sysdeps/ieee754/logb.c | 48 |
1 files changed, 0 insertions, 48 deletions
diff --git a/sysdeps/ieee754/logb.c b/sysdeps/ieee754/logb.c deleted file mode 100644 index 918de9ebad..0000000000 --- a/sysdeps/ieee754/logb.c +++ /dev/null @@ -1,48 +0,0 @@ -/* Copyright (C) 1992, 1995 Free Software Foundation, Inc. -This file is part of the GNU C Library. - -The GNU C Library is free software; you can redistribute it and/or -modify it under the terms of the GNU Library General Public License as -published by the Free Software Foundation; either version 2 of the -License, or (at your option) any later version. - -The GNU C Library is distributed in the hope that it will be useful, -but WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -Library General Public License for more details. - -You should have received a copy of the GNU Library General Public -License along with the GNU C Library; see the file COPYING.LIB. If -not, write to the Free Software Foundation, Inc., 675 Mass Ave, -Cambridge, MA 02139, USA. */ - -#include <ansidecl.h> -#include <math.h> -#include <float.h> -#include "ieee754.h" - -/* Return the base 2 signed integral exponent of X. */ -double -DEFUN(__logb, (x), double x) -{ - union ieee754_double u; - - if (__isnan (x)) - return x; - else if (__isinf (x)) - return HUGE_VAL; - else if (x == 0.0) - return - HUGE_VAL; - - u.d = x; - - if (u.ieee.exponent == 0) - /* A denormalized number. - Multiplying by 2 ** DBL_MANT_DIG normalizes it; - we then subtract the DBL_MANT_DIG we added to the exponent. */ - return (__logb (x * ldexp (1.0, DBL_MANT_DIG)) - DBL_MANT_DIG); - - return (int) u.ieee.exponent - (DBL_MAX_EXP - 1); -} - -weak_alias (__logb, logb) |