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

int __fpclassifyl (long double x)

Function Documentation

int __fpclassifyl ( long double  x)

Definition at line 27 of file s_fpclassifyl.c.

{
  u_int32_t ex, hx, lx;
  int retval = FP_NORMAL;

  GET_LDOUBLE_WORDS (ex, hx, lx, x);
  ex &= 0x7fff;
  if ((ex | lx | hx) == 0)
    retval = FP_ZERO;
  else if (ex == 0 && (hx & 0x80000000) == 0)
    retval = FP_SUBNORMAL;
  else if (ex == 0x7fff)
    retval = ((hx & 0x7fffffff) | lx) != 0 ? FP_NAN : FP_INFINITE;

  return retval;
}