| /*- |
| * ==================================================== |
| * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. |
| * |
| * Developed at SunPro, a Sun Microsystems, Inc. business. |
| * Permission to use, copy, modify, and distribute this |
| * software is freely granted, provided that this notice |
| * is preserved. |
| * ==================================================== |
| * |
| * s_sin.c and s_cos.c merged by Steven G. Kargl. Descriptions of the |
| * algorithms are contained in the original files. |
| */ |
| |
| #include <sys/cdefs.h> |
| __FBSDID("$FreeBSD$"); |
| |
| #include <float.h> |
| |
| #include "math.h" |
| #define INLINE_REM_PIO2 |
| #include "math_private.h" |
| #include "e_rem_pio2.c" |
| #include "k_sincos.h" |
| |
| void |
| sincos(double x, double *sn, double *cs) |
| { |
| double y[2]; |
| int32_t n, ix; |
| |
| /* High word of x. */ |
| GET_HIGH_WORD(ix, x); |
| |
| /* |x| ~< pi/4 */ |
| ix &= 0x7fffffff; |
| if (ix <= 0x3fe921fb) { |
| if (ix < 0x3e400000) { /* |x| < 2**-27 */ |
| if ((int)x == 0) { /* Generate inexact. */ |
| *sn = x; |
| *cs = 1; |
| return; |
| } |
| } |
| __kernel_sincos(x, 0, 0, sn, cs); |
| return; |
| } |
| |
| /* If x = Inf or NaN, then sin(x) = NaN and cos(x) = NaN. */ |
| if (ix >= 0x7ff00000) { |
| *sn = x - x; |
| *cs = x - x; |
| return; |
| } |
| |
| /* Argument reduction. */ |
| n = __ieee754_rem_pio2(x, y); |
| |
| switch(n & 3) { |
| case 0: |
| __kernel_sincos(y[0], y[1], 1, sn, cs); |
| break; |
| case 1: |
| __kernel_sincos(y[0], y[1], 1, cs, sn); |
| *cs = -*cs; |
| break; |
| case 2: |
| __kernel_sincos(y[0], y[1], 1, sn, cs); |
| *sn = -*sn; |
| *cs = -*cs; |
| break; |
| default: |
| __kernel_sincos(y[0], y[1], 1, cs, sn); |
| *sn = -*sn; |
| } |
| } |
| |
| #if (LDBL_MANT_DIG == 53) |
| __weak_reference(sincos, sincosl); |
| #endif |
