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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Multiple identical floating point constants emitted."
href="http://llvm.org/bugs/show_bug.cgi?id=16711">16711</a>
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<th>Summary</th>
<td>Multiple identical floating point constants emitted.
</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>All
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
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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: X86
</td>
</tr>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
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<th>Reporter</th>
<td>silvas@purdue.edu
</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>clang -O3 emits two copies of the constant `42.0f` for this code:
float user1(float F) {
return F * 42.0f;
}
float user2(float F) {
return F * 42.0f;
}
output:
[...]
LCPI0_0:
.long 1109917696 ## float 42
[...]
mulss LCPI0_0(%rip), %xmm0
[...]
LCPI1_0:
.long 1109917696 ## float 42
[...]
mulss LCPI1_0(%rip), %xmm0
[...]
For 3 functions, 3 copies of the constant are emitted, etc. The constants ought
to be uniqued.
`-arch armv7` also seems to experience the same issue.</pre>
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