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