src/math/rintl.c

   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