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<base href="http://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Inefficient tls code for initila exec X86_64"
href="http://llvm.org/bugs/show_bug.cgi?id=17580">17580</a>
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<th>Summary</th>
<td>Inefficient tls code for initila exec X86_64
</td>
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<th>Product</th>
<td>libraries
</td>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>PC
</td>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>Backend: X86
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>rafael.espindola@gmail.com
</td>
</tr>
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<th>CC</th>
<td>echristo@gmail.com, llvmbugs@cs.uiuc.edu, nlewycky@google.com
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>given
-----------------------
__thread int obj;
int test() {
return ((int)&obj) > 0;
}
--------------------
clang with -O2 produces this code for local exec:
movq $obj@TPOFF, %rax
movq %fs:0, %rcx
addl %eax, %ecx
gcc produces
movq %fs:0, %rax
addq $obj@tpoff, %rax
combining the move and the add.</pre>
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