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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Incorrectly complains about `asm volatile("rep outsw %%es:(%%esi), (%%dx)" …`"
href="http://llvm.org/bugs/show_bug.cgi?id=15455">15455</a>
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<th>Summary</th>
<td>Incorrectly complains about `asm volatile("rep outsw %%es:(%%esi), (%%dx)" …`
</td>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.2
</td>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
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<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>paulepanter@users.sourceforge.net
</td>
</tr>
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<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>Using Debian Sid/unstable and Clang 3.2 from Debian experimental
$ clang --version
Debian clang version 3.2-1~exp6 (tags/RELEASE_32/final) (based on LLVM
3.2)
Target: i386-pc-linux-gnu
Thread model: posix
to build SeaBIOS [1], Clang throws the following errors.
$ git clone git://git.seabios.org/seabios.git seabios
$ git show
commit f465e1ec1b01826100c92b890487a2ab09bfe2c1
Author: Kevin O'Connor <kevin at koconnor.net>
Date: Sat Feb 23 21:33:36 2013 -0500
Minor - introduce numeric defines for the IVT offset of hw irqs.
$ make menuconfig # coreboot chosen, see attached
$ CC=clang make
[…]
In file included from src/ata.c:9:
src/ioport.h:126:18: error: invalid operand for instruction
asm volatile("rep outsw %%es:(%%esi), (%%dx)"
^
<inline asm>:1:12: note: instantiated into assembly here
rep outsw %es:(%esi), (%dx)
^~~~~~~~~~
In file included from src/ata.c:9:
src/ioport.h:113:18: error: invalid operand for instruction
asm volatile("rep insw (%%dx), %%es:(%%edi)"
^
<inline asm>:1:11: note: instantiated into assembly here
rep insw (%dx), %es:(%edi)
^~~~~
2 errors generated.
make: *** [out/ata.o] Fehler 1
The lead developer Kevin O’Connor claims the code is correct.
static inline void outsw(u16 port, u16 *data, u32 count) {
asm volatile("rep outsw %%es:(%%esi), (%%dx)"
: "+c"(count), "+S"(data) : "d"(port) : "memory");
}
[1] <a href="http://seabios.org/Download">http://seabios.org/Download</a>
[2] <a href="http://www.seabios.org/pipermail/seabios/2013-March/005769.html">http://www.seabios.org/pipermail/seabios/2013-March/005769.html</a></pre>
</div>
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