gcc/testsuite/gcc.dg/tree-ssa/predcom-dse-11.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -fno-inline -fpredictive-commoning -fdump-tree-pcom-details-blocks" } */
   3
   4 int arr[105] = {2, 3, 5, 7, 11};
   5 int x[105] = {2, 3, 5, 7, 11};
   6 int result0[10] = {2, 3, 5, 7, 11};
   7 int result1[10] = {0, 0, 0, 0, 0, 0, -1, -2, -2};
   8
   9 extern void abort (void);
  10
  11 int __attribute__((noinline)) foo (int * __restrict__ a, int * __restrict__ b, int len, int flag)
  12 {
  13   int i, sum = 0;
  14   for (i = 0; i < len; i++)
  15     {
  16       a[i] = 0;
  17       b[i + 2] = i;
  18       a[i + 1] = -1;
  19       sum += b[i];
  20       a[i + 3] = -2;
  21     }
  22   return sum;
  23 }
  24
  25 void check (int *a, int *res, int len, int sum, int val)
  26 {
  27   int i;
  28
  29   if (sum != val)
  30     abort ();
  31
  32   for (i = 0; i < len; i++)
  33     if (a[i] != res[i])
  34       abort ();
  35 }
  36
  37 int main (void)
  38 {
  39   int i, sum;
  40
  41   sum = foo (arr, x, 0, 0);
  42   check (arr, result0, 10, sum, 0);
  43
  44   sum = foo (arr, x, 6, 0);
  45   check (arr, result1, 10, sum, 11);
  46
  47   return 0;
  48 }
  49 /* { dg-final { scan-tree-dump "Store-stores chain" "pcom"} } */
  50 /* { dg-final { scan-tree-dump "Store-loads chain" "pcom"} } */
  51 /* { dg-final { scan-tree-dump-not "Invalid sum" "pcom" } } */
  52