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<base href="https://llvm.org/bugs/" />
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Consider using movw/movt for local symbols in position independent code on ELF"
href="https://llvm.org/bugs/show_bug.cgi?id=28229">28229</a>
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<th>Summary</th>
<td>Consider using movw/movt for local symbols in position independent code on ELF
</td>
</tr>
<tr>
<th>Product</th>
<td>libraries
</td>
</tr>
<tr>
<th>Version</th>
<td>trunk
</td>
</tr>
<tr>
<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>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
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<th>Component</th>
<td>Backend: ARM
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>rafael.espindola@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Given
@a = hidden global i32 42
define i32* @f() {
ret i32* @a
}
llc produces
movw r0, :lower16:(_a-(LPC0_0+8))
movt r0, :upper16:(_a-(LPC0_0+8))
LPC0_0:
add r0, pc, r0
When targeting MachO but
ldr r0, .LCPI0_0
.LPC0_0:
add r0, pc, r0
...
.LCPI0_0:
.long a-(.LPC0_0+8)
When targeting ELF.
ELF has PREL relocations for MOVW/MOVT, so it should be possible to use
movw/movt on ELF too.</pre>
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