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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - false positive logic error with float variable"
href="http://llvm.org/bugs/show_bug.cgi?id=15985">15985</a>
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<th>Summary</th>
<td>false positive logic error with float variable
</td>
</tr>
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<th>Product</th>
<td>clang
</td>
</tr>
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<th>Version</th>
<td>trunk
</td>
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<th>Hardware</th>
<td>Macintosh
</td>
</tr>
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<th>OS</th>
<td>MacOS X
</td>
</tr>
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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>Static Analyzer
</td>
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<th>Assignee</th>
<td>kremenek@apple.com
</td>
</tr>
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<th>Reporter</th>
<td>bugzilla@jwwalker.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvmbugs@cs.uiuc.edu
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
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<p>
<div>
<pre>Overview:
The static analyzer reports that a variable is used uninitialized, in a
situation where it can't be.
Steps to reproduce:
Analyze this C++ code:
-------------------------------
#include <vector>
static int Foo( std::vector<int>& things )
{
int result = 0;
int blah;
float maxDist = -10000;
if (things.empty())
{
maxDist = 1;
blah = 9;
}
if (maxDist > 0)
{
result = blah + 2;
}
return result;
}
-------------------------------
Actual results:
warning: The left operand of '+' is a garbage value
(pointing to the assignment result = blah + 2)
Expected results:
No warnings.
Build date:
clang version 3.4 (trunk 181711)
Target: x86_64-apple-darwin11.4.2
Thread model: posix
Additional information:
Note that if the vector is empty, then blah will have a value assigned to it,
whereas if the vector is not empty, the assignment to result will not be
reached.
If I change the type of maxDist from float to int, the warning goes away.</pre>
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