rintl.c raw

   1  #include "libm.h"
   2  
   3  #if LDBL_MANT_DIG == 53 && LDBL_MAX_EXP == 1024
   4  long double rintl(long double x)
   5  {
   6  	return rint(x);
   7  }
   8  #elif (LDBL_MANT_DIG == 64 || LDBL_MANT_DIG == 113) && LDBL_MAX_EXP == 16384
   9  
  10  static const long double toint = 1/LDBL_EPSILON;
  11  
  12  long double rintl(long double x)
  13  {
  14  	union ldshape u = {x};
  15  	int e = u.i.se & 0x7fff;
  16  	int s = u.i.se >> 15;
  17  	long double y;
  18  
  19  	if (e >= 0x3fff+LDBL_MANT_DIG-1)
  20  		return x;
  21  	if (s)
  22  		y = x - toint + toint;
  23  	else
  24  		y = x + toint - toint;
  25  	if (y == 0)
  26  		return 0*x;
  27  	return y;
  28  }
  29  #endif
  30