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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - "cannot use inalloca attribute on a register parameter" after argpromoting x86_thiscallcc"
href="https://bugs.llvm.org/show_bug.cgi?id=41658">41658</a>
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<th>Summary</th>
<td>"cannot use inalloca attribute on a register parameter" after argpromoting x86_thiscallcc
</td>
</tr>
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<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Interprocedural Optimizations
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>llvm@inglorion.net
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>The x86_thiscallcc calling convention passes the first parameter (expected to
be "this") in the ECX register. ArgumentPromotion can result in this first
parameter being elided. If this causes an inalloca parameter to end up in the
first slot, we try to pass that in a register, resulting in LLVM ERROR: cannot
use inalloca attribute on a register parameter.</pre>
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