gcc/testsuite/gcc.dg/vect/bb-slp-2.c

/* { dg-require-effective-target vect_int } */

#include <stdarg.h>
#include "tree-vect.h"

#define N 16 

unsigned int out[N*8];
unsigned int in[N*8] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63};

__attribute__ ((noinline)) int
main1 (int dummy)
{
  int i;
  unsigned int *pin = &in[0];
  unsigned int *pout = &out[0];
  
  for (i = 0; i < N*2; i++)
    {
      *pout++ = *pin++;
      *pout++ = *pin++;
      *pout++ = *pin++;
      *pout++ = *pin++;

      /* Avoid loop vectorization.  */
      if (dummy)
        __asm__ volatile ("" : : : "memory");
    }

  /* check results:  */ 
  for (i = 0; i < N; i++)
    {
      if (out[i*8] !=  in[i*8]
         || out[i*8 + 1] != in[i*8 + 1]
         || out[i*8 + 2] != in[i*8 + 2]
         || out[i*8 + 3] != in[i*8 + 3]
         || out[i*8 + 4] != in[i*8 + 4]
         || out[i*8 + 5] != in[i*8 + 5]
         || out[i*8 + 6] != in[i*8 + 6]
         || out[i*8 + 7] != in[i*8 + 7])
	abort ();
    }

  return 0;
}

int main (void)
{
  check_vect ();

  main1 (33);

  return 0;
}

/* { dg-final { scan-tree-dump-times "optimized: basic block" 1 "slp1" } } */