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<base href="https://bugs.llvm.org/">
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - unable to use variable assignment in integrated assembler"
href="https://bugs.llvm.org/show_bug.cgi?id=37425">37425</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>unable to use variable assignment in integrated assembler
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</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>enhancement
</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>ndesaulniers@google.com
</td>
</tr>
<tr>
<th>CC</th>
<td>isanbard@gmail.com, jyknight@google.com, llvm-bugs@lists.llvm.org, niravd@google.com, pirama@google.com, srhines@google.com
</td>
</tr>
<tr>
<th>Blocks</th>
<td>4068
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=20296" name="attach_20296" title="test.S">attachment 20296</a> <a href="attachment.cgi?id=20296&action=edit" title="test.S">[details]</a></span>
test.S
$ cat test.S
var_xdata = %rcx
xorq var_xdata, var_xdata
$ gcc -c test.S
$ objdump -D test.o
test.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <.text>:
0: 48 31 c9 xor %rcx,%rcx
$ clang -c test.S
test.S:1:13: error: unknown token in expression
var_xdata = %rcx
^
test.S:1:13: error: missing expression
var_xdata = %rcx
^
test.S:3:17: error: invalid operand for instruction
xorq var_xdata, var_xdata
^
This is visible while trying to use llvm's integrated assembler to assemble the
linux kernel, particularly:
arch/x86/crypto/aes_ctrby8_avx-x86_64.S
arch/x86/crypto/aesni-intel_avx-x86_64.S</pre>
</div>
</p>
<div id="referenced">
<hr style="border: 1px dashed #969696">
<b>Referenced Bugs:</b>
<ul>
<li>
[<a class="bz_bug_link
bz_status_ASSIGNED "
title="ASSIGNED - [Meta] Compiling the Linux kernel with clang"
href="https://bugs.llvm.org/show_bug.cgi?id=4068">Bug 4068</a>] [Meta] Compiling the Linux kernel with clang
</li>
</ul>
</div>
<br>
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