Mercurial > ecos

annotate packages/language/c/libm/current/src/float/portable-api/sf_atan.c @ 3260:77f9d3253c3e

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Add: Complex number header and library (single and double precision floating point), port from Newlib. Add: Single precision floating point library, port from Newlib. [ Bugzilla 1001539 ]
author vae
date Sun, 25 Aug 2013 14:38:57 +0000
parents
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3260
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
1 //===========================================================================
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
2 //
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
3 // sf_atan.c
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
4 //
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
5 // Part of the standard mathematical function library
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
6 //
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
7 //===========================================================================
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
8 // ####ECOSGPLCOPYRIGHTBEGIN####
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
9 // -------------------------------------------
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
10 // This file is part of eCos, the Embedded Configurable Operating System.
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
11 // Copyright (C) 2012 Free Software Foundation, Inc.
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
12 //
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
13 // eCos is free software; you can redistribute it and/or modify it under
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
14 // the terms of the GNU General Public License as published by the Free
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
15 // Software Foundation; either version 2 or (at your option) any later
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
16 // version.
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
17 //
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
18 // eCos is distributed in the hope that it will be useful, but WITHOUT
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
19 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
20 // FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
21 // for more details.
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
22 //
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
23 // You should have received a copy of the GNU General Public License
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
24 // along with eCos; if not, write to the Free Software Foundation, Inc.,
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
25 // 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
26 //
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
27 // As a special exception, if other files instantiate templates or use
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
28 // macros or inline functions from this file, or you compile this file
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
29 // and link it with other works to produce a work based on this file,
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
30 // this file does not by itself cause the resulting work to be covered by
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
31 // the GNU General Public License. However the source code for this file
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
32 // must still be made available in accordance with section (3) of the GNU
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
33 // General Public License v2.
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
34 //
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
35 // This exception does not invalidate any other reasons why a work based
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
36 // on this file might be covered by the GNU General Public License.
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
37 // -------------------------------------------
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
38 // ####ECOSGPLCOPYRIGHTEND####
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
39 //===========================================================================
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
40 //#####DESCRIPTIONBEGIN####
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
41 //
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
42 // Author(s):
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
43 // Contributors: visar, ilijak
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
44 // Date: 2012-03-08
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
45 // Purpose:
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
46 // Description:
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
47 // Usage:
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
48 //
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
49 //####DESCRIPTIONEND####
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
50 //
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
51 //===========================================================================
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
52
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
53 // CONFIGURATION
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
54
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
55 #include <pkgconf/libm.h> // Configuration header
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
56
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
57 // Include the Math library?
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
58 #ifdef CYGPKG_LIBM
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
59
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
60 // Derived from code with the following copyright
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
61
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
62
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
63 /* sf_atan.c -- float version of s_atan.c.
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
64 * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
65 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
66
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
67 /*
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
68 * ====================================================
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
69 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
70 *
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
71 * Developed at SunPro, a Sun Microsystems, Inc. business.
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
72 * Permission to use, copy, modify, and distribute this
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
73 * software is freely granted, provided that this notice
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
74 * is preserved.
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
75 * ====================================================
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
76 *
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
77 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
78
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
79
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
80 #include "mathincl/fdlibm.h"
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
81
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
82 #ifdef __STDC__
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
83 static const float atanhi[] = {
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
84 #else
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
85 static float atanhi[] = {
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
86 #endif
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
87 4.6364760399e-01, /* atan(0.5)hi 0x3eed6338 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
88 7.8539812565e-01, /* atan(1.0)hi 0x3f490fda */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
89 9.8279368877e-01, /* atan(1.5)hi 0x3f7b985e */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
90 1.5707962513e+00, /* atan(inf)hi 0x3fc90fda */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
91 };
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
92
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
93 #ifdef __STDC__
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
94 static const float atanlo[] = {
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
95 #else
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
96 static float atanlo[] = {
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
97 #endif
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
98 5.0121582440e-09, /* atan(0.5)lo 0x31ac3769 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
99 3.7748947079e-08, /* atan(1.0)lo 0x33222168 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
100 3.4473217170e-08, /* atan(1.5)lo 0x33140fb4 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
101 7.5497894159e-08, /* atan(inf)lo 0x33a22168 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
102 };
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
103
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
104 #ifdef __STDC__
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
105 static const float aT[] = {
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
106 #else
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
107 static float aT[] = {
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
108 #endif
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
109 3.3333334327e-01, /* 0x3eaaaaaa */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
110 -2.0000000298e-01, /* 0xbe4ccccd */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
111 1.4285714924e-01, /* 0x3e124925 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
112 -1.1111110449e-01, /* 0xbde38e38 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
113 9.0908870101e-02, /* 0x3dba2e6e */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
114 -7.6918758452e-02, /* 0xbd9d8795 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
115 6.6610731184e-02, /* 0x3d886b35 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
116 -5.8335702866e-02, /* 0xbd6ef16b */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
117 4.9768779427e-02, /* 0x3d4bda59 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
118 -3.6531571299e-02, /* 0xbd15a221 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
119 1.6285819933e-02, /* 0x3c8569d7 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
120 };
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
121
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
122 #ifdef __STDC__
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
123 static const float
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
124 #else
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
125 static float
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
126 #endif
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
127 one = 1.0,
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
128 huge = 1.0e30;
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
129
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
130 #ifdef __STDC__
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
131 float atanf(float x)
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
132 #else
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
133 float atanf(x)
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
134 float x;
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
135 #endif
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
136 {
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
137 float w,s1,s2,z;
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
138 __int32_t ix,hx,id;
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
139
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
140 hx = CYG_LIBM_WORD(x);
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
141 ix = hx&0x7fffffff;
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
142 if(ix>=0x50800000) { /* if |x| >= 2^34 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
143 if(FLT_UWORD_IS_NAN(ix))
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
144 return x+x; /* NaN */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
145 if(hx>0) return atanhi[3]+atanlo[3];
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
146 else return -atanhi[3]-atanlo[3];
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
147 } if (ix < 0x3ee00000) { /* |x| < 0.4375 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
148 if (ix < 0x31000000) { /* |x| < 2^-29 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
149 if(huge+x>one) return x; /* raise inexact */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
150 }
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
151 id = -1;
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
152 } else {
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
153 x = fabsf(x);
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
154 if (ix < 0x3f980000) { /* |x| < 1.1875 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
155 if (ix < 0x3f300000) { /* 7/16 <=|x|<11/16 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
156 id = 0; x = ((float)2.0*x-one)/((float)2.0+x);
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
157 } else { /* 11/16<=|x|< 19/16 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
158 id = 1; x = (x-one)/(x+one);
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
159 }
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
160 } else {
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
161 if (ix < 0x401c0000) { /* |x| < 2.4375 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
162 id = 2; x = (x-(float)1.5)/(one+(float)1.5*x);
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
163 } else { /* 2.4375 <= |x| < 2^66 */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
164 id = 3; x = -(float)1.0/x;
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
165 }
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
166 }}
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
167 /* end of argument reduction */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
168 z = x*x;
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
169 w = z*z;
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
170 /* break sum from i=0 to 10 aT[i]z**(i+1) into odd and even poly */
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
171 s1 = z*(aT[0]+w*(aT[2]+w*(aT[4]+w*(aT[6]+w*(aT[8]+w*aT[10])))));
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
172 s2 = w*(aT[1]+w*(aT[3]+w*(aT[5]+w*(aT[7]+w*aT[9]))));
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
173 if (id<0) return x - x*(s1+s2);
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
174 else {
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
175 z = atanhi[id] - ((x*(s1+s2) - atanlo[id]) - x);
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
176 return (hx<0)? -z:z;
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
177 }
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
178 }
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
179
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
180
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
181 #endif // ifdef CYGPKG_LIBM
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
182
77f9d3253c3e Add: Complex number header and library (single and double precision floating point),
vae
parents:
diff changeset
183 // EOF sf_atan.c