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  1.  
  2. /* @(#)e_scalb.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. /*
  15.  * __ieee754_scalb(x, fn) is provide for
  16.  * passing various standard test suite. One
  17.  * should use scalbn() instead.
  18.  */
  19.  
  20. #include "fdlibm.h"
  21.  
  22. #ifndef _DOUBLE_IS_32BITS
  23.  
  24. #ifdef _SCALB_INT
  25. #ifdef __STDC__
  26.         double __ieee754_scalb(double x, int fn)
  27. #else
  28.         double __ieee754_scalb(x,fn)
  29.         double x; int fn;
  30. #endif
  31. #else
  32. #ifdef __STDC__
  33.         double __ieee754_scalb(double x, double fn)
  34. #else
  35.         double __ieee754_scalb(x,fn)
  36.         double x, fn;
  37. #endif
  38. #endif
  39. {
  40. #ifdef _SCALB_INT
  41.         return scalbn(x,fn);
  42. #else
  43.         if (isnan(x)||isnan(fn)) return x*fn;
  44.         if (!finite(fn)) {
  45.             if(fn>0.0) return x*fn;
  46.             else       return x/(-fn);
  47.         }
  48.         if (rint(fn)!=fn) return (fn-fn)/(fn-fn);
  49.         if ( fn > 65000.0) return scalbn(x, 65000);
  50.         if (-fn > 65000.0) return scalbn(x,-65000);
  51.         return scalbn(x,(int)fn);
  52. #endif
  53. }
  54.  
  55. #endif /* defined(_DOUBLE_IS_32BITS) */
  56.