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 #include <float.h> 17 18 #include "math.h" 19 #define INLINE_REM_PIO2 20 #include "math_private.h" 21 #include "e_rem_pio2.c" 22 #include "k_sincos.h" 23 24 void 25 sincos(double x, double *sn, double *cs) 26 { 27 double y[2]; 28 int32_t n, ix; 29 30 /* High word of x. */ 31 GET_HIGH_WORD(ix, x); 32 33 /* |x| ~< pi/4 */ 34 ix &= 0x7fffffff; 35 if (ix <= 0x3fe921fb) { 36 if (ix < 0x3e400000) { /* |x| < 2**-27 */ 37 if ((int)x == 0) { /* Generate inexact. */ 38 *sn = x; 39 *cs = 1; 40 return; 41 } 42 } 43 __kernel_sincos(x, 0, 0, sn, cs); 44 return; 45 } 46 47 /* If x = Inf or NaN, then sin(x) = NaN and cos(x) = NaN. */ 48 if (ix >= 0x7ff00000) { 49 *sn = x - x; 50 *cs = x - x; 51 return; 52 } 53 54 /* Argument reduction. */ 55 n = __ieee754_rem_pio2(x, y); 56 57 switch(n & 3) { 58 case 0: 59 __kernel_sincos(y[0], y[1], 1, sn, cs); 60 break; 61 case 1: 62 __kernel_sincos(y[0], y[1], 1, cs, sn); 63 *cs = -*cs; 64 break; 65 case 2: 66 __kernel_sincos(y[0], y[1], 1, sn, cs); 67 *sn = -*sn; 68 *cs = -*cs; 69 break; 70 default: 71 __kernel_sincos(y[0], y[1], 1, cs, sn); 72 *sn = -*sn; 73 } 74 } 75 76 #if (LDBL_MANT_DIG == 53) 77 __weak_reference(sincos, sincosl); 78 #endif 79