gcc/testsuite/gcc.dg/vect/vect-6.c

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

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

#define N 16

float results1[N] = {192.00,240.00,288.00,336.00,384.00,432.00,480.00,528.00,0.00};
float results2[N] = {0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,0.00,54.00,120.00,198.00,288.00,390.00,504.00,630.00};
float a[N] = {0};
float e[N] = {0};
float b[N] = {0,3,6,9,12,15,18,21,24,27,30,33,36,39,42,45};
float c[N] = {0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15};

__attribute__ ((noinline))
int main1 ()
{
  int i;

  for (i = 0; i < N/2; i++)
    { 
      a[i] = b[i+N/2] * c[i+N/2] - b[i] * c[i];
      e[i+N/2] = b[i] * c[i+N/2] + b[i+N/2] * c[i];
    }

  /* check results:  */
  for (i=0; i<N; i++)
    {
      if (a[i] != results1[i] || e[i] != results2[i])
	abort(); 
    }


  for (i = 1; i <=N-4; i++)
    {
      a[i+3] = b[i-1];
    }

  /* check results:  */
  for (i = 1; i <=N-4; i++)
    {
      if (a[i+3] != b[i-1])
        abort ();
    }

  return 0;
}

int main (void)
{
  check_vect ();

  return main1 ();
}

/* { dg-final { scan-tree-dump-times "vectorized 2 loops" 1 "vect" } } */
/* { dg-final { scan-tree-dump-times "Vectorizing an unaligned access" 0 "vect" { target { { vect_aligned_arrays } && {! vect_sizes_32B_16B} } } } } */
/* { dg-final { scan-tree-dump-times "Vectorizing an unaligned access" 1 "vect" { target { {! vect_aligned_arrays } && {vect_sizes_32B_16B} } } } } */