1/**
  2 * This file has no copyright assigned and is placed in the Public Domain.
  3 * This file is part of the mingw-w64 runtime package.
  4 * No warranty is given; refer to the file DISCLAIMER.PD within this package.
  5 */
  6#include "cephes_mconf.h"
  7#ifndef _SET_ERRNO
  8#define _SET_ERRNO(x)
  9#endif
 10
 11#if __SIZEOF_LONG_DOUBLE__ == __SIZEOF_DOUBLE__
 12#include <math.h>
 13
 14long double tanhl(long double x)
 15{
 16  return tanh(x);
 17}
 18#else
 19
 20#ifdef UNK
 21static uLD P[] = {
 22  { { -6.8473739392677100872869E-5L } },
 23  { { -9.5658283111794641589011E-1L } },
 24  { { -8.4053568599672284488465E1L } },
 25  { { -1.3080425704712825945553E3L } }
 26};
 27static uLD Q[] = {
 28  { { 9.6259501838840336946872E1L } },
 29  { { 1.8218117903645559060232E3L } },
 30  { { 3.9241277114138477845780E3L } }
 31};
 32#endif
 33
 34#ifdef IBMPC
 35static uLD P[] = {
 36  { { 0xd2a4,0x1b0c,0x8f15,0x8f99,0xbff1, 0, 0, 0 } },
 37  { { 0x5959,0x9111,0x9cc7,0xf4e2,0xbffe, 0, 0, 0 } },
 38  { { 0xb576,0xef5e,0x6d57,0xa81b,0xc005, 0, 0, 0 } },
 39  { { 0xe3be,0xbfbd,0x5cbc,0xa381,0xc009, 0, 0, 0 } }
 40};
 41static uLD Q[] = {
 42  { { 0x687f,0xce24,0xdd6c,0xc084,0x4005, 0, 0, 0 } },
 43  { { 0x3793,0xc95f,0xfa2f,0xe3b9,0x4009, 0, 0, 0 } },
 44  { { 0xd5a2,0x1f9c,0x0b1b,0xf542,0x400a, 0, 0, 0 } }
 45};
 46#endif
 47
 48#ifdef MIEEE
 49static uLD P[] = {
 50  { { 0xbff10000,0x8f998f15,0x1b0cd2a4, 0 } },
 51  { { 0xbffe0000,0xf4e29cc7,0x91115959, 0 } },
 52  { { 0xc0050000,0xa81b6d57,0xef5eb576, 0 } },
 53  { { 0xc0090000,0xa3815cbc,0xbfbde3be, 0 } }
 54};
 55static uLD Q[] = {
 56  { { 0x40050000,0xc084dd6c,0xce24687f, 0 } },
 57  { { 0x40090000,0xe3b9fa2f,0xc95f3793, 0 } },
 58  { { 0x400a0000,0xf5420b1b,0x1f9cd5a2, 0 } }
 59};
 60#endif
 61
 62long double tanhl(long double x)
 63{
 64  long double s, z;
 65
 66#ifdef MINUSZERO
 67  if (x == 0.0L)
 68    return (x);
 69#endif
 70  if (isnanl(x))
 71  {
 72    _SET_ERRNO (EDOM);
 73    return x;
 74  }
 75
 76  z = fabsl(x);
 77  if (z > 0.5L * MAXLOGL)
 78  {
 79    _SET_ERRNO (ERANGE);
 80    if (x > 0)
 81      return (1.0L);
 82    else
 83      return (-1.0L);
 84  }
 85  if (z >= 0.625L)
 86  {
 87    s = expl(2.0*z);
 88    z =  1.0L  - 2.0/(s + 1.0L);
 89    if (x < 0)
 90      z = -z;
 91  }
 92  else
 93  {
 94    s = x * x;
 95    z = polevll( s, P, 3 )/p1evll(s, Q, 3);
 96    z = x * s * z;
 97    z = x + z;
 98  }
 99  return (z);
100}
101#endif