gcc/testsuite/gcc.dg/vect/vect-strided-shift-1.c

   1 /* PR tree-optimization/65963.  */
   2 #include "tree-vect.h"
   3
   4 #define N 512
   5
   6 int in[2*N], out[N];
   7
   8 __attribute__ ((noinline)) void
   9 loop (void)
  10 {
  11   for (int i = 0; i < N; i++)
  12     out[i] = in[i << 1] + 7;
  13 }
  14
  15 int
  16 main (int argc, char **argv)
  17 {
  18   check_vect ();
  19   for (int i = 0; i < 2*N; i++)
  20     {
  21       in[i] = i;
  22       __asm__ volatile ("" : : : "memory");
  23     }
  24   loop ();
  25   __asm__ volatile ("" : : : "memory");
  26   for (int i = 0; i < N; i++)
  27     {
  28       if (out[i] != i*2 + 7)
  29         abort ();
  30     }
  31   return 0;
  32 }
  33 /* { dg-final { scan-tree-dump-times "vectorized 1 loops in function" 1 "vect" { target { vect_strided2 } } } } */