<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/132084>132084</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [ms] [llvm-ml] Allow size directives on register operands
        </td>
    </tr>

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

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

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

<pre>
    ```asm
        .CODE
        mov rsp, r11
 mov qword ptr rsp, r11
        mov rsp, qword ptr r11
        mov qword ptr rsp, qword ptr r11
        END
```

```console
$ ml64 -nologo -Cp -c -Fo test.obj -W3 test.asm
 Assembling: test.asm
$ objdump -D --section='.text$mn' test.obj

test.obj:     file format pe-x86-64


Disassembly of section .text$mn:

0000000000000000 <.text$mn>:
   0:   49 8b e3                mov    %r11,%rsp
   3:   49 8b e3                mov    %r11,%rsp
   6:   49 8b e3                mov %r11,%rsp
   9:   49 8b e3                mov    %r11,%rsp
$ llvm-ml -m64 -nologo -c -Fo test.obj test.asm
test.asm:3:23: error: expected memory operand after 'ptr', found register operand instead
        mov qword ptr rsp, r11
                      ^
test.asm:4:28: error: expected memory operand after 'ptr', found register operand instead
        mov rsp, qword ptr r11
                           ^
test.asm:5:23: error: expected memory operand after 'ptr', found register operand instead
        mov qword ptr rsp, qword ptr r11
                      ^
```

Not sure if the size directive is needed here or not, but LLVM exits with a error. Microsoft's ml64 accepts the move register-to-register with a size directive.

cc @ericastor 
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzEVc2SozYQfhpx6YICiR_7wMFrj087m1tyFtDYmgKaqIVnJk-fElCOx05qtuaQVbnKavrv-9TdkmY2pwGxFNk3kR0CPbkz2fLZsEN72AUVNe-lyOPlp7kX8Q7WFe1_OzzdyD1dwPIo5B5skniF__LnK9kGRmfvdI9ON5YPJg9R_sv46cdBxLsrYr-_EWsamDr0n2QKfZenEA7U0Ykg3I8Q1hAeCRyyi6h6gfAPtQgr8R0z9lVnhpNQu1uNj0bVSzP1I4QHCEPG2hkahDoIWUQO35yQaT8IWVyjL9CuklootKZDaMn22sGI4dsmD_N0ZRHvDob1guEdqIU1C9wkUKtlfLdAqP2t2dNiCQDxkjrdwqYCVHC3_OkDgJCZP2i59xseF1f1ddf8c9d_9dt-MaWvUNdd-rDvIOxv635X85uqXrdq55nKmS5aS3bevI1YO2ygx57sO9CIVg8N6NahBSGL0VkhC9-sLU1DAxZP81hdLc3ADnXzWat_bPCPS2RPH4GmHujmfwH6yST-DNrsFx7rz-FeIN_dJz_IAU8WwbTgzghs_kJojPXjeEEwDANigw2c0SKQhYGcT1lNDr5___0Z8M04hlfjzqAX6hE8m9oSU-uELHi5m3Rd4-h4ztHTBa9cQ0fhlfca5iOIaEFa1yDSGK2pNTuyEDSlarZqqwMskyKVaRIXmyw4lzpW7bapM6wbmeRpUhStVtsiqfN8k-ZZEZhSxjKLVbJNNtk2zaJKpTqPN0meZJnMlPZ5em26yI9ZRPYUGOYJy0TJeJMGna6w4_mdkXLAV5i1Qkr_7Nhyns1qOrFI486w43_COOO6-YHqWWQHENm3dZC9tOs6er3jzkDDQ1twMNmuPDs3sr_65FHI48m481RFNfVCHn3Q9S8cLb1g7YQ8zihZyONK41LKvwMAAP__ZuYdyw">