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  1. /* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
  2. /* s_frexpf.c -- float version of s_frexp.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: s_frexpf.c,v 1.2 1994/08/18 23:06:51 jtc Exp $";
  19. #endif
  20.  
  21. #include "math.h"
  22. #include "math_private.h"
  23.  
  24. #ifdef __STDC__
  25. static const float
  26. #else
  27. static float
  28. #endif
  29. one   =  1.0000000000e+00, /* 0x3F800000 */
  30. two25 =  3.3554432000e+07; /* 0x4c000000 */
  31.  
  32. #ifdef __STDC__
  33.         float frexpf(float x, int *eptr)
  34. #else
  35.         float frexpf(x, eptr)
  36.         float x; int *eptr;
  37. #endif
  38. {
  39.         int32_t hx,ix;
  40.         GET_FLOAT_WORD(hx,x);
  41.         ix = 0x7fffffff&hx;
  42.         *eptr = 0;
  43.         if(ix>=0x7f800000||(ix==0)) return x;   /* 0,inf,nan */
  44.         if (ix<0x00800000) {            /* subnormal */
  45.             x *= two25;
  46.             GET_FLOAT_WORD(hx,x);
  47.             ix = hx&0x7fffffff;
  48.             *eptr = -25;
  49.         }
  50.         *eptr += (ix>>23)-126;
  51.         hx = (hx&0x807fffff)|0x3f000000;
  52.         *(int*)&x = hx;
  53.         return x;
  54. }
  55.