cross-test.c

来自「早期freebsd实现」· C语言 代码 · 共 90 行

/* This small function uses all the arithmetic operators that
   libgcc1.c can handle.  If you can link it, then
   you have provided replacements for all the libgcc1.c functions that
   your target machine needs.  */

int foo ();
double dfoo ();

main ()
{
  int a = foo (), b = foo ();
  unsigned int au = foo (), bu = foo ();
  float af = dfoo (), bf = dfoo ();
  double ad = dfoo (), bd = dfoo ();

  discard (a * b);
  discard (a / b);
  discard (a % b);

  discard (au / bu);
  discard (au % bu);

  discard (a >> b);
  discard (a << b);

  discard (au >> bu);
  discard (au << bu);

  ddiscard (ad + bd);
  ddiscard (ad - bd);
  ddiscard (ad * bd);
  ddiscard (ad / bd);
  ddiscard (-ad);

  ddiscard (af + bf);
  ddiscard (af - bf);
  ddiscard (af * bf);
  ddiscard (af / bf);
  ddiscard (-af);

  discard ((int) ad);
  discard ((int) af);

  ddiscard ((double) a);
  ddiscard ((float) a);
  ddiscard ((float) ad);

  discard (ad == bd);
  discard (ad < bd);
  discard (ad > bd);
  discard (ad != bd);
  discard (ad <= bd);
  discard (ad >= bd);

  discard (af == bf);
  discard (af < bf);
  discard (af > bf);
  discard (af != bf);
  discard (af <= bf);
  discard (af >= bf);

  return 0;
}

discard (x)
     int x;
{}

ddiscard (x)
     double x;
{}

foo ()
{
  static int table[] = {20, 69, 4, 202};
  static int idx;

  return table[idx++];
}

double
dfoo ()
{
  static double table[] = {20.4, 69.96, 4.4, 202.202};
  static int idx;

  return table[idx++];
}