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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - [X86] mstackrealign takes up extra register"
href="https://bugs.llvm.org/show_bug.cgi?id=37542">37542</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>[X86] mstackrealign takes up extra register
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<th>Hardware</th>
<td>PC
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Backend: X86
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>pirama@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr></table>
<p>
<div>
<pre>Filing issue <a href="https://github.com/android-ndk/ndk/issues/693">https://github.com/android-ndk/ndk/issues/693</a> reported against the
Android NDK.
-mstackrealign causes the register allocator to run out of registers for inline
assembly. Is this expected? Here's a smaller reproducer produced with
CReduce:
$ cat > test.c
#define a(b, c, d, f, e, h, g, j, i, byte, end, l, k, n, m) ""
# 1 "" 3
p, o, q, r, s, t;
u() {
__asm__(a(, , , , , , , , , , , , , , ) a(, , , , , , , , , , , , , , )
: "=&q"(r), "+m"(o), "+&r"(t), "=&r"(q), "+&r"(t), "=&r"(s)
: "m"(p));
}
$ clang "-cc1" "-triple" "i686-none-linux-android" "-emit-obj" "-mstackrealign"
"-x" "c" test.c
:3:11: error: inline assembly requires more registers than available
__asm__(a(, , , , , , , , , , , , , , ) a(, , , , , , , , , , , , , , )
^
h264_cabac-21c918.c:1:61: note: expanded from macro 'a'
#define a(b, c, d, f, e, h, g, j, i, byte, end, l, k, n, m) ""
^
1 error generated.
$ clang "-cc1" "-triple" "i686-none-linux-android" "-emit-obj" "-x" "c" test.c
<no error></pre>
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