gonzui

    1: /* k_sinf.c -- float version of k_sin.c
    2:  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
    3:  */
    4: 
    5: /*
    6:  * ====================================================
    7:  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
    8:  *
    9:  * Developed at SunPro, a Sun Microsystems, Inc. business.
   10:  * Permission to use, copy, modify, and distribute this
   11:  * software is freely granted, provided that this notice 
   12:  * is preserved.
   13:  * ====================================================
   14:  */
   15: 
   16: #include "math.h"
   17: #include "math_private.h"
   18: 
   19: static const float 
   20: half =  5.0000000000e-01,/* 0x3f000000 */
   21: S1  = -1.6666667163e-01, /* 0xbe2aaaab */
   22: S2  =  8.3333337680e-03, /* 0x3c088889 */
   23: S3  = -1.9841270114e-04, /* 0xb9500d01 */
   24: S4  =  2.7557314297e-06, /* 0x3638ef1b */
   25: S5  = -2.5050759689e-08, /* 0xb2d72f34 */
   26: S6  =  1.5896910177e-10; /* 0x2f2ec9d3 */
   27: 
   28: float
   29: __kernel_sinf(float x, float y, int iy)
   30: {
   31:         float z,r,v;
   32:         int32_t ix;
   33:         GET_FLOAT_WORD(ix,x);
   34:         ix &= 0x7fffffff;                      /* high word of x */
   35:         if(ix<0x32000000)                      /* |x| < 2**-27 */
   36:            {if((int)x==0) return x;}           /* generate inexact */
   37:         z      =  x*x;
   38:         v      =  z*x;
   39:         r      =  S2+z*(S3+z*(S4+z*(S5+z*S6)));
   40:         if(iy==0) return x+v*(S1+z*r);
   41:         else      return x-((z*(half*y-v*r)-y)-v*S1);
   42: }