newlib/libm/common/sf_isnan.c

   1 /* sf_c_isnan.c -- float version of s_c_isnan.c.
   2  */
   3
   4 /*
   5  * ====================================================
   6  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   7  *
   8  * Developed at SunPro, a Sun Microsystems, Inc. business.
   9  * Permission to use, copy, modify, and distribute this
  10  * software is freely granted, provided that this notice
  11  * is preserved.
  12  * ====================================================
  13  */
  14
  15 /*
  16  * isnanf(x) returns 1 is x is nan, else 0;
  17  *
  18  * isnanf is an extension declared in <math.h>.
  19  */
  20
  21 #include "fdlibm.h"
  22 #include <ieeefp.h>
  23
  24 #undef isnanf
  25
  26 int
  27 isnanf (float x)
  28 {
  29         __int32_t ix;
  30         GET_FLOAT_WORD(ix,x);
  31         ix &= 0x7fffffff;
  32         return FLT_UWORD_IS_NAN(ix);
  33 }
  34
  35 #ifdef _DOUBLE_IS_32BITS
  36
  37 #undef isnan
  38
  39 int
  40 isnan (double x)
  41 {
  42         return isnanf((float) x);
  43 }
  44
  45 #endif /* defined(_DOUBLE_IS_32BITS) */