diff options
Diffstat (limited to 'sysdeps/libm-ieee754/s_tanhl.c')
| -rw-r--r-- | sysdeps/libm-ieee754/s_tanhl.c | 95 |
1 files changed, 0 insertions, 95 deletions
diff --git a/sysdeps/libm-ieee754/s_tanhl.c b/sysdeps/libm-ieee754/s_tanhl.c deleted file mode 100644 index 1e3dc3b613..0000000000 --- a/sysdeps/libm-ieee754/s_tanhl.c +++ /dev/null @@ -1,95 +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. - * ==================================================== - */ - -#if defined(LIBM_SCCS) && !defined(lint) -static char rcsid[] = "$NetBSD: $"; -#endif - -/* 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**-55 : tanhl(x) := x*(one+x) - * -t - * 2**-55 < x <= 1 : tanhl(x) := -----; t = expm1l(-2x) - * t + 2 - * 2 - * 1 <= x <= 23.0 : tanhl(x) := 1- ----- ; t=expm1l(2x) - * t + 2 - * 23.0 < x <= INF : tanhl(x) := 1. - * - * Special cases: - * tanhl(NaN) is NaN; - * only tanhl(0)=0 is exact for finite argument. - */ - -#include "math.h" -#include "math_private.h" - -#ifdef __STDC__ -static const long double one=1.0, two=2.0, tiny = 1.0e-4900L; -#else -static long double one=1.0, two=2.0, tiny = 1.0e-4900L; -#endif - -#ifdef __STDC__ - long double __tanhl(long double x) -#else - long double __tanhl(x) - long double x; -#endif -{ - long double t,z; - int32_t se; - u_int32_t j0,j1,ix; - - /* High word of |x|. */ - GET_LDOUBLE_WORDS(se,j0,j1,x); - ix = se&0x7fff; - - /* x is INF or NaN */ - if(ix==0x7fff) { - /* for NaN it's not important which branch: tanhl(NaN) = NaN */ - if (se&0x8000) return one/x-one; /* tanhl(-inf)= -1; */ - else return one/x+one; /* tanhl(+inf)=+1 */ - } - - /* |x| < 23 */ - if (ix < 0x4003 || (ix == 0x4003 && j0 < 0xb8000000u)) {/* |x|<23 */ - if ((ix|j0|j1) == 0) - return x; /* x == +- 0 */ - if (ix<0x3fc8) /* |x|<2**-55 */ - return x*(one+x); /* tanh(small) = small */ - if (ix>=0x3fff) { /* |x|>=1 */ - t = __expm1l(two*fabsl(x)); - z = one - two/(t+two); - } else { - t = __expm1l(-two*fabsl(x)); - z= -t/(t+two); - } - /* |x| > 23, return +-1 */ - } else { - z = one - tiny; /* raised inexact flag */ - } - return (se>0x7fff)? -z: z; -} -weak_alias (__tanhl, tanhl) |