gcc/testsuite/gcc.dg/torture/pr48702.c

   1 /* { dg-do run } */
   2
   3 extern void abort (void);
   4
   5 #define LEN 4
   6
   7 static inline void unpack(int  array[LEN])
   8 {
   9   int ii, val;
  10   val = 1;
  11   for (ii = 0; ii < LEN; ii++) {
  12       array[ii] = val % 2;
  13       val = val / 2;
  14   }
  15 }
  16
  17 static inline int  pack(int  array[LEN])
  18 {
  19   int ans, ii;
  20   ans = 0;
  21   for (ii = LEN-1; ii >= 0; ii--) {
  22       ans = 2 * ans + array[ii];
  23   }
  24   return ans;
  25 }
  26
  27 int __attribute__((noinline))
  28 foo()
  29 {
  30   int temp, ans;
  31   int array[LEN];
  32   unpack(array);
  33   temp = array[0];
  34   array[0] = array[2];
  35   array[2] = temp;
  36   ans = pack(array);
  37   return ans;
  38 }
  39
  40 int main(void)
  41 {
  42   int val;
  43   val = foo();
  44   if (val != 4)
  45     abort ();
  46   return 0;
  47 }