1 /* powf.c: Computes x**y where x and y are 32-bit floats.
2 WARNING: less that 6 digits accuracy.
4 Copyright (C) 2001, 2002 Jesus Calvino-Fraga, jesusc@ieee.org
6 This library is free software; you can redistribute it and/or
7 modify it under the terms of the GNU Lesser General Public
8 License as published by the Free Software Foundation; either
9 version 2.1 of the License, or (at your option) any later version.
11 This library is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
16 You should have received a copy of the GNU Lesser General Public
17 License along with this library; if not, write to the Free Software
18 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
20 /* Version 1.0 - Initial release */
25 float powf(const float x, const float y)
27 if(y == 0.0) return 1.0;
29 if(x <= 0.0) return 0.0;
30 return expf(logf(x) * y);