bp.c

来自「linux下编程用 编译软件」· C语言 代码 · 共 33 行

/* { dg-do compile } */
/* { dg-options "-O2" } */
/* { dg-final { scan-assembler "b\[np\] " } } */

#define a_val (*((volatile unsigned char *) 0x7f14))
#define b_val (*((volatile unsigned char *) 0x7f10))

unsigned char * a_ptr = (unsigned char *) 0x7f14;
unsigned char * b_ptr = (unsigned char *) 0x7f10;

int
foo (void)
{
  if (a_val & 0x08)
    {
      if (b_val & 0x08)
	return -1;

      return 0;
    }

  return -1;
}

int
bar (void)
{
  *a_ptr = 0x08;
  *b_ptr = 0xf7;

  return foo ();
}