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<base href="https://bugs.freedesktop.org/">
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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - LLVM unit tests have error in random number handling"
href="https://bugs.freedesktop.org/show_bug.cgi?id=106232">106232</a>
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<th>Summary</th>
<td>LLVM unit tests have error in random number handling
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>18.0
</td>
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<th>Hardware</th>
<td>Other
</td>
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<th>OS</th>
<td>All
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>medium
</td>
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<th>Component</th>
<td>Drivers/Gallium/llvmpipe
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
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<th>Reporter</th>
<td>tom.hudson.phd@gmail.com
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</tr>
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
</td>
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<p>
<div>
<pre>src/gallium/drivers/llvmpipe/lp_test_main.c:random_elem() seems to have the
logic reversed in its handling of unsigned values:
if(!type.sign)
if(rand() & 1)
value = -value;
This code only generates negative numbers for *unsigned* values.
write_elem() then has code to fix this up:
if(!type.sign && value < 0.0)
value = 0.0;
In practice, the unit tests only cover half the possible range of unsigned
values, and the half of the elements they generate they use are all 0.</pre>
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