Subversion Repositories openrisc_2011-10-31

/* 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);

}