gcc/testsuite/gcc.dg/tree-ssa/ldist-9.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -ftree-loop-distribution -fdump-tree-ldist-all" } */
   3
   4 int loop1 (int k)
   5 {
   6   unsigned int i;
   7   int a[1000], b[1000];
   8
   9   for (i = 1; i < (1000-1); i ++) {
  10     a[i] = a[i+1] + a[i-1]; /* S1 */
  11     b[i] = a[i-1] + k; /* S2 */
  12   }
  13   /*
  14     Dependences:
  15     S1->S2 (flow, level 1)
  16     S1->S1 (anti, level 1)
  17     S1->S1 (flow, level 1)
  18
  19     One partition, because of the cost of cache misses.
  20   */
  21
  22   return a[1000-2] + b[1000-1];
  23 }
  24
  25 /* { dg-final { scan-tree-dump-times "distributed: split to 2 loops" 0 "ldist" } } */