<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/142388>142388</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [Sparc] `LDX`/`STX` are defined for Sparc v8
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          Rot127
      </td>
    </tr>
</table>

<pre>
    The `LDX` and `STX` instructions are not defined in the Sparc v8 ISA. But assemble in in LLVM instead of being invalid.

```
echo "ldx [%g1], %o7 ; stx %o7, [%g1]"  | llvm-mc --assemble --triple=sparc --show-encoding
        .text
        ldx [%g1], %o7 ! encoding: [0xde,0x58,0x40,0x00]
        stx %o7, [%g1] ! encoding: [0xde,0x70,0x40,0x00]
```

cc @koachan
</pre>
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