gcc/testsuite/gcc.dg/tree-ssa/predcom-dse-1.c

   1 /* { dg-do run } */
   2 /* { dg-options "-O2 -fno-inline -fno-tree-loop-distribute-patterns -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, 5, -2, 11, 0};
   7 int result2[10] = {0, 0, -1, -2, -2, 0};
   8 int result3[10] = {0, 0, 0, -1, -2, -2, 0};
   9 int result4[10] = {0, 0, 0, 0, -1, -2, -2, 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, -2, 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 + 3] = -2;
  28     }
  29 }
  30
  31 void check (int *a, int *res, int len)
  32 {
  33   int i;
  34
  35   for (i = 0; i < len; i++)
  36     if (a[i] != res[i])
  37       abort ();
  38 }
  39
  40 int main (void)
  41 {
  42   foo (arr, 0);
  43   check (arr, result0, 10);
  44
  45   foo (arr, 1);
  46   check (arr, result1, 10);
  47
  48   foo (arr, 2);
  49   check (arr, result2, 10);
  50
  51   foo (arr, 3);
  52   check (arr, result3, 10);
  53
  54   foo (arr, 4);
  55   check (arr, result4, 10);
  56
  57   foo (arr, 100);
  58   check (arr, result100, 105);
  59
  60   return 0;
  61 }
  62 /* { dg-final { scan-tree-dump "Store-stores chain" "pcom"} } */