<html>
<head>
<base href="http://llvm.org/bugs/" />
</head>
<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - __declspec(naked) functions run out of registers"
href="http://llvm.org/bugs/show_bug.cgi?id=20052">20052</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>__declspec(naked) functions run out of registers
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>Linux
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>jmuizelaar@mozilla.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>The following function (reduced from some nss code) builds with cl but not with
clang-cl
int s_mpi_is_sse2();
__declspec(naked)
void s_mpv_mul_d( )
{
__asm {
call s_mpi_is_sse2
lodsd ; []
mov edx,[0]
mov ebx,0
stosd ; []
dec ecx
}
}
In this case we emit code that does the following for the call
0: bf 00 00 00 00 movl $0, %edi
5: ff d7 calll *%edi
We should really be doing this call directly instead of doing it indirectly.
This would save us from needing the extra registers.</pre>
</div>
</p>
<hr>
<span>You are receiving this mail because:</span>
<ul>
<li>You are on the CC list for the bug.</li>
</ul>
</body>
</html>