1/* Compute sine and cosine of argument. 2 Copyright (C) 1997, 2000 Free Software Foundation, Inc. 3 This file is part of the GNU C Library. 4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. 5 6 The GNU C 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. 10 11 The GNU C 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. 15 16 You should have received a copy of the GNU Lesser General Public 17 License along with the GNU C Library; if not, write to the Free 18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 19 02111-1307 USA. */ 20 21#include <math.h> 22 23#include "math_private.h" 24 25 26void 27__sincosf (float x, float *sinx, float *cosx) 28{ 29 int32_t ix; 30 31 /* High word of x. */ 32 GET_FLOAT_WORD (ix, x); 33 34 /* |x| ~< pi/4 */ 35 ix &= 0x7fffffff; 36 if (ix <= 0x3f490fd8) 37 { 38 *sinx = __kernel_sinf (x, 0.0, 0); 39 *cosx = __kernel_cosf (x, 0.0); 40 } 41 else if (ix>=0x7f800000) 42 { 43 /* sin(Inf or NaN) is NaN */ 44 *sinx = *cosx = x - x; 45 } 46 else 47 { 48 /* Argument reduction needed. */ 49 float y[2]; 50 int n; 51 52 n = __ieee754_rem_pio2f (x, y); 53 switch (n & 3) 54 { 55 case 0: 56 *sinx = __kernel_sinf (y[0], y[1], 1); 57 *cosx = __kernel_cosf (y[0], y[1]); 58 break; 59 case 1: 60 *sinx = __kernel_cosf (y[0], y[1]); 61 *cosx = -__kernel_sinf (y[0], y[1], 1); 62 break; 63 case 2: 64 *sinx = -__kernel_sinf (y[0], y[1], 1); 65 *cosx = -__kernel_cosf (y[0], y[1]); 66 break; 67 default: 68 *sinx = -__kernel_cosf (y[0], y[1]); 69 *cosx = __kernel_sinf (y[0], y[1], 1); 70 break; 71 } 72 } 73} 74weak_alias (__sincosf, sincosf) 75