1 /* asincosf.c: Computes asin or acos 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 P1 0.933935835E+0
28 #define P2 -0.504400557E+0
29 #define Q0 0.560363004E+1
30 #define Q1 -0.554846723E+1
31 #define Q2 0.100000000E+1
33 #define P(g) (P2*g+P1)
34 #define Q(g) ((Q2*g+Q1)*g+Q0)
42 float asincosf(const float x, const int isacos)
47 static myconst float a[2]={ 0.0, QUART_PI };
48 static myconst float b[2]={ HALF_PI, QUART_PI };
72 r=y+y*((P(g)*g)/Q(g));