gcc/testsuite/gcc.dg/vect/bb-slp-59.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target vect_double } */
   3 /* { dg-additional-options "-fdump-tree-loopdone" } */
   4
   5 double x[1024];
   6 void bar (void);
   7
   8 void foo (void)
   9 {
  10   double tem1 = x[0];
  11   double tem2 = x[1];
  12   for (int i = 0; i < 511; ++i)
  13     {
  14       x[2*i] = tem2;
  15       x[2*i+1] = tem1;
  16       bar ();
  17       tem1 = x[2*(i+1)];
  18       tem2 = x[2*(i+1)+1];
  19     }
  20 }
  21
  22 /* We should be able to vectorize the cycle in one SLP attempt including
  23    both load groups and do only one permutation.  */
  24 /* { dg-final { scan-tree-dump-times "transform load" 2 "slp1" } } */
  25 /* { dg-final { scan-tree-dump-times "VEC_PERM_EXPR" 1 "loopdone" } } */
  26 /* { dg-final { scan-tree-dump-times "optimized: basic block" 1 "slp1" } } */