fsneq.c

来自「sdcc是为51等小型嵌入式cpu设计的c语言编译器支持数种不同类型的cpu」· C语言 代码 · 共 51 行

/*
** libgcc support for software floating point.
** Copyright (C) 1991 by Pipeline Associates, Inc.  All rights reserved.
** Permission is granted to do *anything* you want with this file,
** commercial or otherwise, provided this message remains intact.  So there!
** I would appreciate receiving any updates/patches/changes that anyone
** makes, and am willing to be the repository for said changes (am I
** making a big mistake?).
**
** Pat Wood
** Pipeline Associates, Inc.
** pipeline![e-mail] or
** sun!pipeline!phw or
** uunet!motown!pipeline!phw
*/

/*
** $Id: fsneq.c 3513 2004-10-01 14:49:51Z vrokas $
*/

/* (c)2000/2001: hacked a little by [e-mail] for sdcc */

#include <float.h>

union float_long
  {
    float f;
    long l;
  };

/* compare two floats */
char __fsneq (float a1, float a2) _FS_REENTRANT
{
  FS_STATIC volatile union float_long fl1, fl2;

  fl1.f = a1;
  fl2.f = a2;

#if 0
  if (fl1.l<0 && fl2.l<0)
    {
      fl1.l ^= SIGNBIT;
      fl2.l ^= SIGNBIT;
    }
#endif

  if (fl1.l == fl2.l)
    return (0);
  return (1);
}