gcc/testsuite/gcc.dg/tree-ssa/predcom-dse-12.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, 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 int sum;
  20
  21 void __attribute__((noinline)) foo (int * restrict a, int len, int t1, int t2)
  22 {
  23   int i;
  24   for (i = 0; i < len; i++)
  25     {
  26       a[i] = t1;
  27       a[i + 3] = t2;
  28       a[i + 1] = -1;
  29       sum = sum + a[i] + a[i + 3];
  30     }
  31 }
  32
  33 void check (int *a, int *res, int len, int sval)
  34 {
  35   int i;
  36
  37   if (sum != sval)
  38     abort ();
  39
  40   for (i = 0; i < len; i++)
  41     if (a[i] != res[i])
  42       abort ();
  43 }
  44
  45 int main (void)
  46 {
  47   foo (arr, 0, 0, -2);
  48   check (arr, result0, 10, 0);
  49
  50   foo (arr, 1, 0, -2);
  51   check (arr, result1, 10, -2);
  52
  53   foo (arr, 2, 0, -2);
  54   check (arr, result2, 10, -6);
  55
  56   foo (arr, 3, 0, -2);
  57   check (arr, result3, 10, -12);
  58
  59   foo (arr, 4, 0, -2);
  60   check (arr, result4, 10, -20);
  61
  62   foo (arr, 100, 0, -2);
  63   check (arr, result100, 105, -220);
  64
  65   return 0;
  66 }
  67 /* { dg-final { scan-tree-dump "Store-stores chain" "pcom"} } */