[Bug tree-optimization/61938] Vectorization not happening .

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61938

--- Comment #7 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to harmeeksingh from comment #6)
>   
> Equivalent code when written by hand where tmp is a intermediate array . The
> compiler 
> vectorizes both loops. 
> 
>   int k, i;
>   /* vectorize the compares */
>   for (i=0; i < arraysize; ++i) {
>        tmp[i] = (array[i] == compval);
>   }
> 
>   /* another loop now set the result array */
>   for (k=0, i=0; i < arraysize; ++i) {
>      if (tmp[i])
>      {
>        result[k] = i;
>        k++;
>      }
>   }

I only see the first loop vectorized.

typedef long  int int64;
typedef  int int32;

void foo (int       arraysize,
          int       *__restrict  result,
          int   *__restrict tmp,
          int       *__restrict  selectvector,
          int       selectelements,
          int64     *__restrict array,
          int64     compval)
{
  int k, i;
  /* another loop now set the result array */
  for (k=0, i=0; i < arraysize; ++i) {
      if (tmp[i])
        {
          result[k] = i;
          k++;
        }
  }
}

cannot be vectorized exactly because of the said reasons.