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

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Functions

long int __lroundf (float x)

Function Documentation

long int __lroundf ( float  x)

Definition at line 27 of file s_lroundf.c.

{
  int32_t j0;
  u_int32_t i;
  long int result;
  int sign;

  GET_FLOAT_WORD (i, x);
  j0 = ((i >> 23) & 0xff) - 0x7f;
  sign = (i & 0x80000000) != 0 ? -1 : 1;
  i &= 0x7fffff;
  i |= 0x800000;

  if (j0 < (int32_t) (8 * sizeof (long int)) - 1)
    {
      if (j0 < 0)
       return j0 < -1 ? 0 : sign;
      else if (j0 >= 23)
       result = (long int) i << (j0 - 23);
      else
       {
         i += 0x400000 >> j0;

         result = i >> (23 - 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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