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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - inline asm doesn't support %z0"
href="http://llvm.org/bugs/show_bug.cgi?id=21105">21105</a>
</td>
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<th>Summary</th>
<td>inline asm doesn't support %z0
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.4
</td>
</tr>
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<th>Hardware</th>
<td>PC
</td>
</tr>
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<th>OS</th>
<td>Windows NT
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>-New Bugs
</td>
</tr>
<tr>
<th>Assignee</th>
<td>unassignedclangbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>llvmbugzilla@limegreensocks.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>Using:
clang version 3.5.0 (217039)
Target: i686-pc-windows-gnu
Thread model: posix
Compiling this code with "clang z2.cpp":
int main(int argc, char *argv[])
{
int a = 3;
asm volatile ("add%z0 $4, %0": "=m" (a));
}
Gives these errors:
z2.cpp:5:18: error: invalid operand in inline asm: 'add${0:z} $$4, $0'
asm volatile ("add%z0 $4, %0": "=m" (a));
^
z2.cpp:5:18: error: ambiguous instructions require an explicit suffix (could be
'addb', 'addw', 'addl', or 'addq')
<inline asm>:1:2: note: instantiated into assembly here
add $4, -12(%ebp)
^
2 errors generated.
Note that this code compiles correctly with gcc. See also the gcc docs at
<a href="https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#i386Operandmodifiers">https://gcc.gnu.org/onlinedocs/gcc/Extended-Asm.html#i386Operandmodifiers</a></pre>
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