Subversion Repositories Kolibri OS

Rev

Blame | Last modification | View Log | Download | RSS feed

  1. /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
  2. /* w_powf.c -- float version of w_pow.c.
  3.  * Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
  4.  */
  5.  
  6. /*
  7.  * ====================================================
  8.  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
  9.  *
  10.  * Developed at SunPro, a Sun Microsystems, Inc. business.
  11.  * Permission to use, copy, modify, and distribute this
  12.  * software is freely granted, provided that this notice
  13.  * is preserved.
  14.  * ====================================================
  15.  */
  16.  
  17. #if defined(LIBM_SCCS) && !defined(lint)
  18. static char rcsid[] = "$Id: w_powf.c,v 1.1 1994/08/10 20:35:29 jtc Exp $";
  19. #endif
  20.  
  21. /*
  22.  * wrapper powf(x,y) return x**y
  23.  */
  24.  
  25. #include "math.h"
  26. #include "math_private.h"
  27.  
  28.  
  29. #ifdef __STDC__
  30.         float powf(float x, float y)    /* wrapper powf */
  31. #else
  32.         float powf(x,y)                 /* wrapper powf */
  33.         float x,y;
  34. #endif
  35. {
  36. #ifdef _IEEE_LIBM
  37.         return  __ieee754_powf(x,y);
  38. #else
  39.         float z;
  40.         z=__ieee754_powf(x,y);
  41.         if(_LIB_VERSION == _IEEE_|| isnanf(y)) return z;
  42.         if(isnanf(x)) {
  43.             if(y==(float)0.0)
  44.                 /* powf(NaN,0.0) */
  45.                 return (float)__kernel_standard((double)x,(double)y,142);
  46.             else
  47.                 return z;
  48.         }
  49.         if(x==(float)0.0){
  50.             if(y==(float)0.0)
  51.                 /* powf(0.0,0.0) */
  52.                 return (float)__kernel_standard((double)x,(double)y,120);
  53.             if(finitef(y)&&y<(float)0.0)
  54.                 /* powf(0.0,negative) */
  55.                 return (float)__kernel_standard((double)x,(double)y,123);
  56.             return z;
  57.         }
  58.         if(!finitef(z)) {
  59.             if(finitef(x)&&finitef(y)) {
  60.                 if(isnanf(z))
  61.                     /* powf neg**non-int */
  62.                     return (float)__kernel_standard((double)x,(double)y,124);
  63.                 else
  64.                     /* powf overflow */
  65.                     return (float)__kernel_standard((double)x,(double)y,121);
  66.             }
  67.         }
  68.         if(z==(float)0.0&&finitef(x)&&finitef(y))
  69.             /* powf underflow */
  70.             return (float)__kernel_standard((double)x,(double)y,122);
  71.         return z;
  72. #endif
  73. }
  74.