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

long double __truncl (long double x)

Function Documentation

long double __truncl ( long double  x)

Definition at line 28 of file s_truncl.c.

{
  int32_t j0;
  u_int64_t i0, i1, sx;

  GET_LDOUBLE_WORDS64 (i0, i1, x);
  sx = i0 & 0x8000000000000000ULL;
  j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
  if (j0 < 48)
    {
      if (j0 < 0)
       /* The magnitude of the number is < 1 so the result is +-0.  */
       SET_LDOUBLE_WORDS64 (x, sx, 0);
      else
       SET_LDOUBLE_WORDS64 (x, i0 & ~(0x0000ffffffffffffLL >> j0), 0);
    }
  else if (j0 > 111)
    {
      if (j0 == 0x4000)
       /* x is inf or NaN.  */
       return x + x;
    }
  else
    {
      SET_LDOUBLE_WORDS64 (x, i0, i1 & ~(0xffffffffffffffffULL >> (j0 - 48)));
    }

  return x;
}

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