gcc/testsuite/gcc.dg/vect/pr85586.c

   1 #define N 100
   2
   3 void __attribute__ ((noipa))
   4 foo (int *out, int *in, int step)
   5 {
   6   for (int i = 0; i < N; ++i)
   7     {
   8       out[0] = in[i];
   9       out[1] = 2;
  10       out += step;
  11     }
  12 }
  13
  14 int in[N];
  15 int out[N * 2];
  16
  17 int
  18 main (void)
  19 {
  20   for (int i = 0; i < N; ++i)
  21     {
  22       in[i] = i * (i + 1);
  23       asm volatile ("" ::: "memory");
  24     }
  25
  26   foo (out, in, 1);
  27   for (int i = 0; i < N; ++i)
  28     if (out[i] != in[i])
  29       __builtin_abort ();
  30   if (out[N] != 2)
  31     __builtin_abort ();
  32
  33   foo (out + N - 1, in, -1);
  34   if (out[0] != in[N - 1])
  35     __builtin_abort ();
  36   for (int i = 1; i <= N; ++i)
  37     if (out[i] != 2)
  38       __builtin_abort ();
  39
  40   return 0;
  41 }
  42
  43 /* { dg-final { scan-tree-dump-times "LOOP VECTORIZED" 1 "vect" { target vect_int } } } */