Subversion Repositories Kolibri OS

Rev

Rev 4872 | Blame | Compare with Previous | Last modification | View Log | RSS feed

  1. /* sf_asinh.c -- float version of s_asinh.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. one =  1.0000000000e+00, /* 0x3F800000 */
  24. ln2 =  6.9314718246e-01, /* 0x3f317218 */
  25. huge=  1.0000000000e+30;
  26.  
  27. #ifdef __STDC__
  28.         float asinhf(float x)
  29. #else
  30.         float asinhf(x)
  31.         float x;
  32. #endif
  33. {      
  34.         float t,w;
  35.         __int32_t hx,ix;
  36.         GET_FLOAT_WORD(hx,x);
  37.         ix = hx&0x7fffffff;
  38.         if(!FLT_UWORD_IS_FINITE(ix)) return x+x;        /* x is inf or NaN */
  39.         if(ix< 0x31800000) {    /* |x|<2**-28 */
  40.             if(huge+x>one) return x;    /* return x inexact except 0 */
  41.         }
  42.         if(ix>0x4d800000) {     /* |x| > 2**28 */
  43.             w = __ieee754_logf(fabsf(x))+ln2;
  44.         } else if (ix>0x40000000) {     /* 2**28 > |x| > 2.0 */
  45.             t = fabsf(x);
  46.             w = __ieee754_logf((float)2.0*t+one/(__ieee754_sqrtf(x*x+one)+t));
  47.         } else {                /* 2.0 > |x| > 2**-28 */
  48.             t = x*x;
  49.             w =log1pf(fabsf(x)+t/(one+__ieee754_sqrtf(one+t)));
  50.         }
  51.         if(hx>0) return w; else return -w;
  52. }
  53.  
  54. #ifdef _DOUBLE_IS_32BITS
  55.  
  56. #ifdef __STDC__
  57.         double asinh(double x)
  58. #else
  59.         double asinh(x)
  60.         double x;
  61. #endif
  62. {
  63.         return (double) asinhf((float) x);
  64. }
  65.  
  66. #endif /* defined(_DOUBLE_IS_32BITS) */
  67.