gnu/dist/gcc4/gcc/testsuite/gcc.c-torture/execute/20031215-1.c

   1 /* PR middle-end/13400 */
   2 /* The following test used to fail at run-time with a write to read-only
   3    memory, caused by if-conversion converting a conditional write into an
   4    unconditional write.  */
   5
   6 typedef struct {int c, l; char ch[3];} pstr;
   7 const pstr ao = {2, 2, "OK"};
   8 const pstr * const a = &ao;
   9
  10 void test1(void)
  11 {
  12     if (a->ch[a->l]) {
  13         ((char *)a->ch)[a->l] = 0;
  14     }
  15 }
  16
  17 void test2(void)
  18 {
  19     if (a->ch[a->l]) {
  20         ((char *)a->ch)[a->l] = -1;
  21     }
  22 }
  23
  24 void test3(void)
  25 {
  26     if (a->ch[a->l]) {
  27         ((char *)a->ch)[a->l] = 1;
  28     }
  29 }
  30
  31 int main(void)
  32 {
  33     test1();
  34     test2();
  35     test3();
  36     return 0;
  37 }
  38