diff options
Diffstat (limited to 'sysdeps/ieee754/ldbl-128/s_tanhl.c')
-rw-r--r-- | sysdeps/ieee754/ldbl-128/s_tanhl.c | 100 |
1 files changed, 0 insertions, 100 deletions
diff --git a/sysdeps/ieee754/ldbl-128/s_tanhl.c b/sysdeps/ieee754/ldbl-128/s_tanhl.c deleted file mode 100644 index 0db8f5f775..0000000000 --- a/sysdeps/ieee754/ldbl-128/s_tanhl.c +++ /dev/null @@ -1,100 +0,0 @@ -/* s_tanhl.c -- long double version of s_tanh.c. - * Conversion to long double by Ulrich Drepper, - * Cygnus Support, drepper@cygnus.com. - */ - -/* - * ==================================================== - * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. - * - * Developed at SunPro, a Sun Microsystems, Inc. business. - * Permission to use, copy, modify, and distribute this - * software is freely granted, provided that this notice - * is preserved. - * ==================================================== - */ - -/* Changes for 128-bit long double contributed by - Stephen L. Moshier <moshier@na-net.ornl.gov> */ - -/* tanhl(x) - * Return the Hyperbolic Tangent of x - * - * Method : - * x -x - * e - e - * 0. tanhl(x) is defined to be ----------- - * x -x - * e + e - * 1. reduce x to non-negative by tanhl(-x) = -tanhl(x). - * 2. 0 <= x <= 2**-57 : tanhl(x) := x*(one+x) - * -t - * 2**-57 < x <= 1 : tanhl(x) := -----; t = expm1l(-2x) - * t + 2 - * 2 - * 1 <= x <= 40.0 : tanhl(x) := 1- ----- ; t=expm1l(2x) - * t + 2 - * 40.0 < x <= INF : tanhl(x) := 1. - * - * Special cases: - * tanhl(NaN) is NaN; - * only tanhl(0)=0 is exact for finite argument. - */ - -#include <float.h> -#include <math.h> -#include <math_private.h> - -static const _Float128 one = 1.0, two = 2.0, tiny = L(1.0e-4900); - -_Float128 -__tanhl (_Float128 x) -{ - _Float128 t, z; - u_int32_t jx, ix; - ieee854_long_double_shape_type u; - - /* Words of |x|. */ - u.value = x; - jx = u.parts32.w0; - ix = jx & 0x7fffffff; - /* x is INF or NaN */ - if (ix >= 0x7fff0000) - { - /* for NaN it's not important which branch: tanhl(NaN) = NaN */ - if (jx & 0x80000000) - return one / x - one; /* tanhl(-inf)= -1; */ - else - return one / x + one; /* tanhl(+inf)=+1 */ - } - - /* |x| < 40 */ - if (ix < 0x40044000) - { - if (u.value == 0) - return x; /* x == +- 0 */ - if (ix < 0x3fc60000) /* |x| < 2^-57 */ - { - math_check_force_underflow (x); - return x * (one + tiny); /* tanh(small) = small */ - } - u.parts32.w0 = ix; /* Absolute value of x. */ - if (ix >= 0x3fff0000) - { /* |x| >= 1 */ - t = __expm1l (two * u.value); - z = one - two / (t + two); - } - else - { - t = __expm1l (-two * u.value); - z = -t / (t + two); - } - /* |x| > 40, return +-1 */ - } - else - { - z = one - tiny; /* raised inexact flag */ - } - return (jx & 0x80000000) ? -z : z; -} -weak_alias (__tanhl, tanhl) |