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  1. /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
  2. /* @(#)w_exp.c 5.1 93/09/24 */
  3. /*
  4.  * ====================================================
  5.  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
  6.  *
  7.  * Developed at SunPro, a Sun Microsystems, Inc. business.
  8.  * Permission to use, copy, modify, and distribute this
  9.  * software is freely granted, provided that this notice
  10.  * is preserved.
  11.  * ====================================================
  12.  */
  13.  
  14. #if defined(LIBM_SCCS) && !defined(lint)
  15. static char rcsid[] = "$Id: w_exp.c,v 1.4 1994/08/10 20:34:00 jtc Exp $";
  16. #endif
  17.  
  18. /*
  19.  * wrapper exp(x)
  20.  */
  21.  
  22. #include "math.h"
  23. #include "math_private.h"
  24.  
  25. #ifdef __STDC__
  26. static const double
  27. #else
  28. static double
  29. #endif
  30. o_threshold=  7.09782712893383973096e+02,  /* 0x40862E42, 0xFEFA39EF */
  31. u_threshold= -7.45133219101941108420e+02;  /* 0xc0874910, 0xD52D3051 */
  32.  
  33. #ifdef __STDC__
  34.         double exp(double x)            /* wrapper exp */
  35. #else
  36.         double exp(x)                   /* wrapper exp */
  37.         double x;
  38. #endif
  39. {
  40. #ifdef _IEEE_LIBM
  41.         return __ieee754_exp(x);
  42. #else
  43.         double z;
  44.         z = __ieee754_exp(x);
  45.         if(_LIB_VERSION == _IEEE_) return z;
  46.         if(finite(x)) {
  47.             if(x>o_threshold)
  48.                 return __kernel_standard(x,x,6); /* exp overflow */
  49.             else if(x<u_threshold)
  50.                 return __kernel_standard(x,x,7); /* exp underflow */
  51.         }
  52.         return z;
  53. #endif
  54. }
  55.