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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Clang does not support ARMv6k"
href="http://llvm.org/bugs/show_bug.cgi?id=21127">21127</a>
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<th>Summary</th>
<td>Clang does not support ARMv6k
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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<th>Hardware</th>
<td>All
</td>
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<th>OS</th>
<td>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>enhancement
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Driver
</td>
</tr>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>t.p.northover@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>E.g.
$ cat tmp.c
void foo() {
asm volatile("wfe");
}
$ clang -target arm-linux-gnueabi -march=armv6k tmp.c -c
<inline asm>:1:2: error: instruction requires: armv6t2
wfe
There are 2 problems here:
1. Clang treats "armv6k" the same as "armv6" for -march purposes (and defaults
to arm1136jf-s). It's actually a slight enhancement over stock v6, including
the WFE instruction in ARM mode. It should probably default to arm1176jzf-s,
since that's the first (and only) CPU guaranteed to have v6k but not others.
2. LLVM doesn't know about armv6k either. ARM1176JZF-S is treated as a plain
armv6 CPU by the backend and won't allow WFE to be assembled.</pre>
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</p>
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