gcc/testsuite/gcc.dg/vect/slp-reduc-9.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target vect_int_mult } */
   3
   4 int
   5 bar (int *x, int a, int b, int n)
   6 {
   7   x = __builtin_assume_aligned (x, __BIGGEST_ALIGNMENT__);
   8   int sum1 = 0;
   9   int sum2 = 0;
  10   for (int i = 0; i < n; ++i)
  11     {
  12       /* Reduction chain vectorization fails here because of the
  13          different operations but we can still vectorize both
  14          reductions as SLP reductions, saving IVs.  */
  15       sum1 += x[2*i] - a;
  16       sum1 += x[2*i+1] * b;
  17       sum2 += x[2*i] - b;
  18       sum2 += x[2*i+1] * a;
  19     }
  20   return sum1 + sum2;
  21 }
  22
  23 /* { dg-final { scan-tree-dump "Loop contains only SLP stmts" "vect" } } */
  24 /* { dg-final { scan-tree-dump "vectorizing stmts using SLP" "vect" } } */
  25 /* { dg-final { scan-tree-dump "vectorized 1 loops" "vect" } } */