Subversion Repositories Kolibri OS

Rev

Go to most recent revision | Blame | Last modification | View Log | Download | RSS feed

  1. /* kf_sin.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 "fdlibm.h"
  17.  
  18. #ifdef __STDC__
  19. static const float
  20. #else
  21. static float
  22. #endif
  23. half =  5.0000000000e-01,/* 0x3f000000 */
  24. S1  = -1.6666667163e-01, /* 0xbe2aaaab */
  25. S2  =  8.3333337680e-03, /* 0x3c088889 */
  26. S3  = -1.9841270114e-04, /* 0xb9500d01 */
  27. S4  =  2.7557314297e-06, /* 0x3638ef1b */
  28. S5  = -2.5050759689e-08, /* 0xb2d72f34 */
  29. S6  =  1.5896910177e-10; /* 0x2f2ec9d3 */
  30.  
  31. #ifdef __STDC__
  32.         float __kernel_sinf(float x, float y, int iy)
  33. #else
  34.         float __kernel_sinf(x, y, iy)
  35.         float x,y; int iy;              /* iy=0 if y is zero */
  36. #endif
  37. {
  38.         float z,r,v;
  39.         __int32_t ix;
  40.         GET_FLOAT_WORD(ix,x);
  41.         ix &= 0x7fffffff;                       /* high word of x */
  42.         if(ix<0x32000000)                       /* |x| < 2**-27 */
  43.            {if((int)x==0) return x;}            /* generate inexact */
  44.         z       =  x*x;
  45.         v       =  z*x;
  46.         r       =  S2+z*(S3+z*(S4+z*(S5+z*S6)));
  47.         if(iy==0) return x+v*(S1+z*r);
  48.         else      return x-((z*(half*y-v*r)-y)-v*S1);
  49. }
  50.