[Bug gas/22529] New: AArch64 treats vector register sizes of 8b and 4b as the same thing.

[tamar.christina at arm dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=22529

            Bug ID: 22529
           Summary: AArch64 treats vector register sizes of 8b and 4b as
                    the same thing.
           Product: binutils
           Version: 2.29
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gas
          Assignee: unassigned at sourceware dot org
          Reporter: tamar.christina at arm dot com
  Target Milestone: ---

AArch64 treats the following two instructions the same

```
udot v0.2s,v1.8b,v2.4b
```

and

```
udot v0.2s,v1.8b,v2.8b
```

by treating the `4b` as `8b`.

The former one is not valid and should be rejected.

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