[Bug target/65952] New: [AArch64] Will not vectorize copying pointers

[alalaw01 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65952

            Bug ID: 65952
           Summary: [AArch64] Will not vectorize copying pointers
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Keywords: missed-optimization
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: alalaw01 at gcc dot gnu.org
  Target Milestone: ---
            Target: aarch64

typedef struct {
  int a, b, c, d;
} my_struct;

my_struct *array;
my_struct *ptrs[4];

void
loop ()
{
  for (int i = 0; i < 4; i++)
    ptrs[i] = &array[i];
}

Vectorizes on x86, but not on AArch64. From -fdump-tree-vect-details:

test.c:13:3: note: vectorization factor = 4
...
test.c:13:3: note: not vectorized: relevant stmt not supported: _6 = _5 * 16;
test.c:13:3: note: bad operation or unsupported loop bound.
test.c:13:3: note: ***** Re-trying analysis with vector size 8
...
test.c:13:3: note: not vectorized: no vectype for stmt: ptrs[i_12] = _7;
 scalar_type: struct my_struct *
test.c:13:3: note: bad data references.
test.c:11:1: note: vectorized 0 loops in function.