20000108-1.c

来自「linux下编程用 编译软件」· C语言 代码 · 共 21 行

/* Copyright (C) 2000  Free Software Foundation.

   by Alexandre Oliva  <[e-mail]>  */

/* { dg-do run } */
/* { dg-options "-O3" } */

extern void abort (void);

void foo () {} /* unused, but essential to trigger the bug */

int main () {
  int i;
  /* use asms to prevent optimizations */
  /* i = -1; */ asm ("" : "=r" (i) : "0" (-1));
  /* i =  1; */ asm ("" : "=r" (i) : "0" (i ? 1 : 2));
  if (i != 1)
    abort();
  return 0;
}