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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 --- - false positive: unitilization after switch"
href="https://llvm.org/bugs/show_bug.cgi?id=25337">25337</a>
</td>
</tr>
<tr>
<th>Summary</th>
<td>false positive: unitilization after switch
</td>
</tr>
<tr>
<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>3.7
</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>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Priority</th>
<td>P
</td>
</tr>
<tr>
<th>Component</th>
<td>Static Analyzer
</td>
</tr>
<tr>
<th>Assignee</th>
<td>kremenek@apple.com
</td>
</tr>
<tr>
<th>Reporter</th>
<td>dushistov@gmail.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr></table>
<p>
<div>
<pre>For such code:
int f(unsigned val)
{
int res;
switch ((val & 1)) {
case 0: res = 1; break;
case 1: res = 2; break;
}
return res;
}
clang static analyser (3.7) return "Undefined or garbage value returned to
caller", but this is not true because of (val & 1) can produce only 0 or 1, so
all possible branches handled in switch, and res will contain not garbage.</pre>
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</p>
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