1 /* sincoshf.c: Computes sinh or cosh of a 32-bit float as outlined in [1]
3 Copyright (C) 2001, 2002 Jesus Calvino-Fraga, jesusc@ieee.org
5 This library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 This library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with this library; if not, write to the Free Software
17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
19 /* [1] William James Cody and W. M. Waite. _Software manual for the
20 elementary functions_, Englewood Cliffs, N.J.:Prentice-Hall, 1980. */
22 /* Version 1.0 - Initial release */
27 #define P0 -0.713793159E+1
28 #define P1 -0.190333999E+0
29 #define Q0 -0.428277109E+2
30 #define Q1 0.100000000E+1
32 #define P(z) (P1*z+P0)
33 #define Q(z) (Q1*z+Q0)
35 #define K1 0.69316101074218750000E+0 /* ln(v) */
36 #define K2 0.24999308500451499336E+0 /* v**(-2) */
37 #define K3 0.13830277879601902638E-4 /* v/2-1 */
39 //WMAX is defined as ln(XMAX)-ln(v)+0.69
40 #define WMAX 44.93535952E+0
43 #define YBAR 9.0 /*Works for me*/
45 float sincoshf(const float x, const int iscosh)
50 if (x<0.0) { y=-x; sign=1; }
53 if ((y>1.0) || iscosh)