20041114-1.c

来自「用于进行gcc测试」· C语言 代码 · 共 36 行

/* Verify that
   
   var <= 0 || ((long unsigned) (unsigned) (var - 1) < MAX_UNSIGNED_INT)

   gets folded to 1.  */

#include <limits.h>

void abort (void);
void link_failure (void);

volatile int v;

void 
foo (int var)
{
  if (!(var <= 0
        || ((long unsigned) (unsigned) (var - 1) < UINT_MAX)))
    link_failure ();
}

int
main (int argc, char **argv)
{
  foo (v);
  return 0;
}

#ifndef __OPTIMIZE__
void
link_failure (void)
{
  abort ();
}
#endif