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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - inefficient local dynamic code on x86_64"
href="http://llvm.org/bugs/show_bug.cgi?id=17582">17582</a>
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<th>Summary</th>
<td>inefficient local dynamic code on x86_64
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
</tr>
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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>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: X86
</td>
</tr>
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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>
<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>given
__attribute__((visibility("hidden"))) __thread int obj1;
__attribute__((visibility("hidden"))) __thread int obj2;
void f(int, int);
void test() {
f(((int)&obj1) > 0, ((int)&obj2) > 0);
}
clang correctly selects the local dynamic model (just one call to
__tls_get_addr), but the code is
leaq obj1@TLSLD(%rip), %rdi
callq __tls_get_addr@PLT
movq %rax, %rcx
movq $obj1@DTPOFF, %rdi
addl %ecx, %edi
movq $obj2@DTPOFF, %rsi
addl %eax, %esi
the movq %rax, %rcx seems pointless. We can just add from %eax directly.</pre>
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