gcc/testsuite/gcc.dg/tree-ssa/predcom-dse-6.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, 13, 17, 19};
   5 int result0[10] = {2, 3, 5, 7, 11, 13, 17, 19};
   6 int result1[10] = {0, -1, -2, -3, -4, -5, 17, 19};
   7 int result2[10] = {0, 0, -1, -2, -3, -4, -5, 19};
   8 int result3[10] = {0, 0, 0, -1, -2, -3, -4, -5};
   9 int result4[10] = {0, 0, 0, 0, -1, -2, -3, -4, -5};
  10 int result100[105] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  11                       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  12                       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  13                       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  14                       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  15                       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
  16                       0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, -2, -3, -4, -5};
  17
  18 extern void abort (void);
  19
  20 void __attribute__((noinline)) foo (int *a, int len)
  21 {
  22   int i;
  23   for (i = 0; i < len; i++)
  24     {
  25       a[i] = 0;
  26       a[i + 1] = -1;
  27       a[i + 2] = -2;
  28       a[i + 3] = -3;
  29       a[i + 4] = -4;
  30       a[i + 5] = -5;
  31     }
  32 }
  33
  34 void check (int *a, int *res, int len)
  35 {
  36   int i;
  37
  38   for (i = 0; i < len; i++)
  39     if (a[i] != res[i])
  40       abort ();
  41 }
  42
  43 int main (void)
  44 {
  45   foo (arr, 0);
  46   check (arr, result0, 10);
  47
  48   foo (arr, 1);
  49   check (arr, result1, 10);
  50
  51   foo (arr, 2);
  52   check (arr, result2, 10);
  53
  54   foo (arr, 3);
  55   check (arr, result3, 10);
  56
  57   foo (arr, 4);
  58   check (arr, result4, 10);
  59
  60   foo (arr, 100);
  61   check (arr, result100, 105);
  62
  63   return 0;
  64 }
  65 /* { dg-final { scan-tree-dump "Store-stores chain" "pcom"} } */
  66 /* { dg-final { scan-tree-dump-not "Invalid sum" "pcom" } } */