lib/libc/softfloat/unorddf2.c

   1 /* $NetBSD: unorddf2.c,v 1.1 2003/05/06 08:58:19 rearnsha Exp $ */
   2
   3 /*
   4  * Written by Richard Earnshaw, 2003.  This file is in the Public Domain.
   5  */
   6
   7 #include "softfloat-for-gcc.h"
   8 #include "milieu.h"
   9 #include "softfloat.h"
  10
  11 #include <sys/cdefs.h>
  12 #if defined(LIBC_SCCS) && !defined(lint)
  13 __RCSID("$NetBSD: unorddf2.c,v 1.1 2003/05/06 08:58:19 rearnsha Exp $");
  14 #endif /* LIBC_SCCS and not lint */
  15
  16 flag __unorddf2(float64, float64);
  17
  18 flag
  19 __unorddf2(float64 a, float64 b)
  20 {
  21         /*
  22          * The comparison is unordered if either input is a NaN.
  23          * Test for this by comparing each operand with itself.
  24          * We must perform both comparisons to correctly check for
  25          * signalling NaNs.
  26          */
  27         return 1 ^ (float64_eq(a, a) & float64_eq(b, b));
  28 }