1 /*- 2 * ==================================================== 3 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 4 * 5 * Developed at SunPro, a Sun Microsystems, Inc. business. 6 * Permission to use, copy, modify, and distribute this 7 * software is freely granted, provided that this notice 8 * is preserved. 9 * ==================================================== 10 * 11 * s_sin.c and s_cos.c merged by Steven G. Kargl. Descriptions of the 12 * algorithms are contained in the original files. 13 */ 14 15 #include <sys/cdefs.h> 16 __FBSDID("$FreeBSD$"); 17 18 #include <float.h> 19 20 #include "math.h" 21 #define INLINE_REM_PIO2 22 #include "math_private.h" 23 #include "e_rem_pio2.c" 24 #include "k_sincos.h" 25 26 void 27 sincos(double x, double *sn, double *cs) 28 { 29 double y[2]; 30 int32_t n, ix; 31 32 /* High word of x. */ 33 GET_HIGH_WORD(ix, x); 34 35 /* |x| ~< pi/4 */ 36 ix &= 0x7fffffff; 37 if (ix <= 0x3fe921fb) { 38 if (ix < 0x3e400000) { /* |x| < 2**-27 */ 39 if ((int)x == 0) { /* Generate inexact. */ 40 *sn = x; 41 *cs = 1; 42 return; 43 } 44 } 45 __kernel_sincos(x, 0, 0, sn, cs); 46 return; 47 } 48 49 /* If x = Inf or NaN, then sin(x) = NaN and cos(x) = NaN. */ 50 if (ix >= 0x7ff00000) { 51 *sn = x - x; 52 *cs = x - x; 53 return; 54 } 55 56 /* Argument reduction. */ 57 n = __ieee754_rem_pio2(x, y); 58 59 switch(n & 3) { 60 case 0: 61 __kernel_sincos(y[0], y[1], 1, sn, cs); 62 break; 63 case 1: 64 __kernel_sincos(y[0], y[1], 1, cs, sn); 65 *cs = -*cs; 66 break; 67 case 2: 68 __kernel_sincos(y[0], y[1], 1, sn, cs); 69 *sn = -*sn; 70 *cs = -*cs; 71 break; 72 default: 73 __kernel_sincos(y[0], y[1], 1, cs, sn); 74 *sn = -*sn; 75 } 76 } 77 78 #if (LDBL_MANT_DIG == 53) 79 __weak_reference(sincos, sincosl); 80 #endif 81