<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/124427>124427</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Error assembling movk instruction on aarch64 in clang 19 (breaks compiling isa-l on aarch64)
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            clang
      </td>
    </tr>

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

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

<pre>
    The following assembly:

```asm
.equ    p4_low_b0, 0x0000
movk    x1, p4_low_b0, lsl 16
```

Could be assembled by earlier versions of clang (I tested 16, 17, and 18). However, starting with 5da801386c2b820a4596fc6d8da6b5f4a6da94b4, trying to assemble this code now produces:

```
> clang -c test.S
test.S:2:25: error: unexpected token in argument list
movk x1, p4_low_b0, lsl 16
 ^
```

If we modify the code to not use `.equ`:

```asm
movk    x1, 0x0000, lsl 16
```asm

Then it assembles without error.

I found this issue when attempting to compile https://github.com/intel/isa-l on MacOS aarch64 with clang 19.

FYI: @MaskRay 
</pre>
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