用于进行gcc测试

				/* powerpc64-linux gcc miscompiled this due to rs6000.c:expand_block_move				   not setting mem aliasing info correctly for the code implementing the				   structure assignment.  */								struct termios				{				  unsigned int a;				  unsigned int b;				  unsigned int c;				  unsigned int d;				  unsigned char pad[28];				};								struct tty_driver				{				  unsigned char pad1[38];				  struct termios t __attribute__ ((aligned (8)));				};								static struct termios zero_t;				static struct tty_driver pty;								void ini (void)				{				  pty.t = zero_t;				  pty.t.a = 1;				  pty.t.b = 2;				  pty.t.c = 3;				  pty.t.d = 4;				}								int main (void)				{				  extern void abort (void);								  ini ();				  if (pty.t.a != 1				      || pty.t.b != 2				      || pty.t.c != 3				      || pty.t.d != 4)				    abort ();				  return 0;				}