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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - MS ABI: fastcall methods with struct return are broken"
href="http://llvm.org/bugs/show_bug.cgi?id=20278">20278</a>
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<th>Summary</th>
<td>MS ABI: fastcall methods with struct return are broken
</td>
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<th>Product</th>
<td>clang
</td>
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<th>Version</th>
<td>unspecified
</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>LLVM Codegen
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
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</tr>
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<th>Reporter</th>
<td>rnk@google.com
</td>
</tr>
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<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
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<th>Classification</th>
<td>Unclassified
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<p>
<div>
<pre>We have two register parameters and we are failing to account for the fact that
the sret parameter consumes one register slot.
This program fails to link and run together with MSVC:
struct SRet {
int x;
SRet(int x) : x(x) {}
};
struct A {
virtual SRet __fastcall f(int);
};
#ifdef CONFIG_1
SRet A::f(int x) {
return SRet(x);
}
#else
int main() {
A a;
SRet x = a.f(42);
return x.x;
}
#endif
It should exit 42.</pre>
</div>
</p>
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