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[/] [openrisc/] [trunk/] [gnu-stable/] [newlib-1.18.0/] [newlib/] [libm/] [math/] [kf_sin.c] - Rev 859
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/* kf_sin.c -- float version of k_sin.c * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com. */ /* * ==================================================== * 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. * ==================================================== */ #include "fdlibm.h" #ifdef __STDC__ static const float #else static float #endif half = 5.0000000000e-01,/* 0x3f000000 */ S1 = -1.6666667163e-01, /* 0xbe2aaaab */ S2 = 8.3333337680e-03, /* 0x3c088889 */ S3 = -1.9841270114e-04, /* 0xb9500d01 */ S4 = 2.7557314297e-06, /* 0x3638ef1b */ S5 = -2.5050759689e-08, /* 0xb2d72f34 */ S6 = 1.5896910177e-10; /* 0x2f2ec9d3 */ #ifdef __STDC__ float __kernel_sinf(float x, float y, int iy) #else float __kernel_sinf(x, y, iy) float x,y; int iy; /* iy=0 if y is zero */ #endif { float z,r,v; __int32_t ix; GET_FLOAT_WORD(ix,x); ix &= 0x7fffffff; /* high word of x */ if(ix<0x32000000) /* |x| < 2**-27 */ {if((int)x==0) return x;} /* generate inexact */ z = x*x; v = z*x; r = S2+z*(S3+z*(S4+z*(S5+z*S6))); if(iy==0) return x+v*(S1+z*r); else return x-((z*(half*y-v*r)-y)-v*S1); }
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