gcc/testsuite/gcc.dg/tree-ssa/predcom-dse-5.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -fno-inline -fpredictive-commoning -fdump-tree-pcom-details" } */
   3
   4 int arr[105] = {2, 3, 5, 7, 11};
   5 int result0[10] = {2, 3, 5, 7, 11};
   6 int result1[10] = {0, -1, -2, -3, 11, 0};
   7 int result2[10] = {0, 0, -1, -2, -3, 0};
   8 int result3[10] = {0, 0, 0, -1, -2, -3, 0};
   9 int result4[10] = {0, 0, 0, 0, -1, -2, -3, 0};
  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, 0};
  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     }
  30 }
  31
  32 void check (int *a, int *res, int len)
  33 {
  34   int i;
  35
  36   for (i = 0; i < len; i++)
  37     if (a[i] != res[i])
  38       abort ();
  39 }
  40
  41 int main (void)
  42 {
  43   foo (arr, 0);
  44   check (arr, result0, 10);
  45
  46   foo (arr, 1);
  47   check (arr, result1, 10);
  48
  49   foo (arr, 2);
  50   check (arr, result2, 10);
  51
  52   foo (arr, 3);
  53   check (arr, result3, 10);
  54
  55   foo (arr, 4);
  56   check (arr, result4, 10);
  57
  58   foo (arr, 100);
  59   check (arr, result100, 105);
  60
  61   return 0;
  62 }
  63 /* { dg-final { scan-tree-dump "Store-stores chain" "pcom"} } */