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glibc  2.9
Functions
s_lroundl.c File Reference
#include <math.h>
#include "math_private.h"
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Functions

long int __lroundl (long double x)

Function Documentation

long int __lroundl ( long double  x)

Definition at line 28 of file s_lroundl.c.

{
  int64_t j0;
  u_int64_t i1, i0;
  long int result;
  int sign;

  GET_LDOUBLE_WORDS64 (i0, i1, x);
  j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
  sign = (i0 & 0x8000000000000000ULL) != 0 ? -1 : 1;
  i0 &= 0x0000ffffffffffffLL;
  i0 |= 0x0001000000000000LL;

  if (j0 < 48)
    {
      if (j0 < 0)
       return j0 < -1 ? 0 : sign;
      else
       {
         i0 += 0x0000800000000000LL >> j0;
         result = i0 >> (48 - j0);
       }
    }
  else if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
    {
      if (j0 >= 112)
       result = ((long int) i0 << (j0 - 48)) | (i1 << (j0 - 112));
      else
       {
         u_int64_t j = i1 + (0x8000000000000000ULL >> (j0 - 48));
         if (j < i1)
           ++i0;

         if (j0 == 48)
           result = (long int) i0;
         else
           result = ((long int) i0 << (j0 - 48)) | (j >> (112 - j0));
       }
    }
  else
    {
      /* The number is too large.  It is left implementation defined
        what happens.  */
      return (long int) x;
    }

  return sign * result;
}

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