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  1. /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
  2. /* w_expf.c -- float version of w_exp.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_expf.c,v 1.1 1994/08/10 20:34:03 jtc Exp $";
  19. #endif
  20.  
  21. /*
  22.  * wrapper expf(x)
  23.  */
  24.  
  25. #include "math.h"
  26. #include "math_private.h"
  27.  
  28. #ifdef __STDC__
  29. static const float
  30. #else
  31. static float
  32. #endif
  33. o_threshold=  8.8721679688e+01,  /* 0x42b17180 */
  34. u_threshold= -1.0397208405e+02;  /* 0xc2cff1b5 */
  35.  
  36. #ifdef __STDC__
  37.         float expf(float x)             /* wrapper expf */
  38. #else
  39.         float expf(x)                   /* wrapper expf */
  40.         float x;
  41. #endif
  42. {
  43. #ifdef _IEEE_LIBM
  44.         return __ieee754_expf(x);
  45. #else
  46.         float z;
  47.         z = __ieee754_expf(x);
  48.         if(_LIB_VERSION == _IEEE_) return z;
  49.         if(finitef(x)) {
  50.             if(x>o_threshold)
  51.                 /* exp overflow */
  52.                 return (float)__kernel_standard((double)x,(double)x,106);
  53.             else if(x<u_threshold)
  54.                 /* exp underflow */
  55.                 return (float)__kernel_standard((double)x,(double)x,107);
  56.         }
  57.         return z;
  58. #endif
  59. }
  60.