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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - At -O2, debug info says variable has constant value"
href="http://llvm.org/bugs/show_bug.cgi?id=22101">22101</a>
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<th>Summary</th>
<td>At -O2, debug info says variable has constant value
</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>Common Code Generator Code
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
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<th>Reporter</th>
<td>paul_robinson@playstation.sony.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
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<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=13636" name="attach_13636" title="Sample source">attachment 13636</a> <a href="attachment.cgi?id=13636&action=edit" title="Sample source">[details]</a></span>
Sample source
On x86-64 Linux, compiling the attached source with -O2 -g, the debug info
for local variable "compare" has DW_AT_const_value = 0, but actually it can
become 1 or -1.
Trying to reduce the source much further caused the const_value to go away,
leaving "compare" with no location at all, which isn't what I wanted to show.
Might be related to PR22099 but it feels different, mainly because it's
clear "compare" has a fairly extensive lifetime, which is not the case
with the other example.</pre>
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