/*- * ==================================================== * 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_sincosf.c -- float version of s_sincos.c. * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. * Optimized by Bruce D. Evans. * Merged s_sinf.c and s_cosf.c by Steven G. Kargl. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include <float.h> #include "math.h" #define INLINE_REM_PIO2F #include "math_private.h" #include "e_rem_pio2f.c" #include "k_sincosf.h" /* Small multiples of pi/2 rounded to double precision. */ static const double p1pio2 = 1*M_PI_2, /* 0x3FF921FB, 0x54442D18 */ p2pio2 = 2*M_PI_2, /* 0x400921FB, 0x54442D18 */ p3pio2 = 3*M_PI_2, /* 0x4012D97C, 0x7F3321D2 */ p4pio2 = 4*M_PI_2; /* 0x401921FB, 0x54442D18 */ void sincosf(float x, float *sn, float *cs) { float c, s; double y; int32_t n, hx, ix; GET_FLOAT_WORD(hx, x); ix = hx & 0x7fffffff; if (ix <= 0x3f490fda) { /* |x| ~<= pi/4 */ if (ix < 0x39800000) { /* |x| < 2**-12 */ if ((int)x == 0) { *sn = x; /* x with inexact if x != 0 */ *cs = 1; return; } } __kernel_sincosdf(x, sn, cs); return; } if (ix <= 0x407b53d1) { /* |x| ~<= 5*pi/4 */ if (ix <= 0x4016cbe3) { /* |x| ~<= 3pi/4 */ if (hx > 0) { __kernel_sincosdf(x - p1pio2, cs, sn); *cs = -*cs; } else { __kernel_sincosdf(x + p1pio2, cs, sn); *sn = -*sn; } } else { if (hx > 0) __kernel_sincosdf(x - p2pio2, sn, cs); else __kernel_sincosdf(x + p2pio2, sn, cs); *sn = -*sn; *cs = -*cs; } return; } if (ix <= 0x40e231d5) { /* |x| ~<= 9*pi/4 */ if (ix <= 0x40afeddf) { /* |x| ~<= 7*pi/4 */ if (hx > 0) { __kernel_sincosdf(x - p3pio2, cs, sn); *sn = -*sn; } else { __kernel_sincosdf(x + p3pio2, cs, sn); *cs = -*cs; } } else { if (hx > 0) __kernel_sincosdf(x - p4pio2, sn, cs); else __kernel_sincosdf(x + p4pio2, sn, cs); } return; } /* If x = Inf or NaN, then sin(x) = NaN and cos(x) = NaN. */ if (ix >= 0x7f800000) { *sn = x - x; *cs = x - x; return; } /* Argument reduction. */ n = __ieee754_rem_pio2f(x, &y); __kernel_sincosdf(y, &s, &c); switch(n & 3) { case 0: *sn = s; *cs = c; break; case 1: *sn = c; *cs = -s; break; case 2: *sn = -s; *cs = -c; break; default: *sn = -c; *cs = s; } }