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<base href="https://bugs.llvm.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [Windows][AArch64] Returning structures from functions has wrong ABI"
href="https://bugs.llvm.org/show_bug.cgi?id=47836">47836</a>
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<th>Summary</th>
<td>[Windows][AArch64] Returning structures from functions has wrong ABI
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Windows NT
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>C++
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>myriachan@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>blitzrakete@gmail.com, dgregor@apple.com, erik.pilkington@gmail.com, llvm-bugs@lists.llvm.org, richard-llvm@metafoo.co.uk
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=24056" name="attach_24056" title="source files to reproduce">attachment 24056</a> <a href="attachment.cgi?id=24056&action=edit" title="source files to reproduce">[details]</a></span>
source files to reproduce
Clang++ has an incorrect ABI for Windows ARM64. When returning a non-POD type
from a function in Windows, the function is expected to return the hidden
destination pointer in X0. This will crash in certain scenarios when MSVC
compiles some translation units and Clang++ others.
This is equivalent to the following existing bug, but for ARM64 instead of
x86/x86-64. I have not checked ARM32 Windows.
<a class="bz_bug_link
bz_status_RESOLVED bz_closed"
title="RESOLVED FIXED - [Windows] Returning structures from functions has wrong ABI"
href="show_bug.cgi?id=15556">https://bugs.llvm.org/show_bug.cgi?id=15556</a>
clang-cl --target=arm64-pc-windows-msvc /c /MT /GS vectorbug-clang-side.cpp
cl /c /MT /GS vectorbug-msvc-side.cpp
link /DEBUG /OUT:vectorbug.exe vectorbug-msvc-side.obj vectorbug-clang-side.obj
libcmt.lib kernel32.lib</pre>
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