/*- * ==================================================== * 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> #if defined(LIBM_SCCS) && !defined(lint) __RCSID("$NetBSD: s_sincos.c,v 1.5 2022/08/29 01:48:34 riastradh Exp $"); #endif #if 0 __FBSDID("$FreeBSD: head/lib/msun/src/s_sincos.c 319047 2017-05-28 06:13:38Z mmel $"); #endif #include "namespace.h" #include <float.h> #include "math.h" // #define INLINE_REM_PIO2 #include "math_private.h" // #include "e_rem_pio2.c" #include "k_sincos.h" #ifdef __weak_alias __weak_alias(sincos,_sincos) #endif 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 !defined(__HAVE_LONG_DOUBLE) __weak_alias(sincosl, sincos); #endif |