<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/64319>64319</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            ASAN on arm64 windows builds but crashes because SANITIZER_WINDOWS64 is used to do x86_64 instruction parsing
        </td>
    </tr>

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

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

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

<pre>
    For context you can build asan for arm64 however it asserts in `GetInstructionSize` because it can't parse the arm instructions.


`SANITIZER_WINDOWS64` as defined should only be used to determine if we are working on a 32bit or 64bit operating system. 
https://github.com/llvm/llvm-project/blob/145a9290c2ecee0eb43964ec13bcc080d4db6030/compiler-rt/lib/sanitizer_common/sanitizer_platform.h#L114-L118

However, in practice it is being used to parse x86_64 instructions.
https://github.com/llvm/llvm-project/blob/145a9290c2ecee0eb43964ec13bcc080d4db6030/compiler-rt/lib/interception/interception_win.cpp#L459-L486


</pre>
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