<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/60715>60715</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Inline Assembly Dialect Option for clang-cl
        </td>
    </tr>

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

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

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

<pre>
    Some performance-critical inline assembly for ia-32/amd64 compiles nicely with ordinary clang under Linux. Per [current practice](https://stackoverflow.com/a/58154963), `-masm=intel` is used to select Intel syntax for sanity (note that, as discussed at that link, various alternatives such as `.intel_syntax noprefix` are "problematic" on a technical level.) This works great.

However, on Windows with Visual Studio, there's clang-cl, and clang-cl does not recognize this option:
```text
clang-cl: warning: unknown argument ignored in clang-cl: '-masm=intel' [-Wunknown-argument]
```
Commentary for this specific argument appears to be nonexistent, and the [docs do not list](https://clang.llvm.org/docs/UsersManual.html#id12) it as supported. This is a problem because there does not seem to be an alternative way to select the assembly dialect in clang-cl. The dialect defaults to AT&T, which obviously causes various failures.

Please add support in clang-cl for `-masm=intel` or provide/document an alternate way of selecting inline assembler dialect.
</pre>
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