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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - clamp with bounds inside [0, 1] generates slow code"
href="https://bugs.freedesktop.org/show_bug.cgi?id=76862">76862</a>
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<th>Assignee</th>
<td>idr@freedesktop.org
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<th>Summary</th>
<td>clamp with bounds inside [0, 1] generates slow code
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>enhancement
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
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<th>Reporter</th>
<td>idr@freedesktop.org
</td>
</tr>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Version</th>
<td>git
</td>
</tr>
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<th>Component</th>
<td>glsl-compiler
</td>
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<th>Product</th>
<td>Mesa
</td>
</tr></table>
<p>
<div>
<pre>Code sequences like
a = clamp(b, 0, .5)
c = clamp(d, .1, 1);
generates both instructions. However, each of these could be implemented with
a single instruction with a SAT modifier. The first example above should be
MAX_SAT a, b, .5;
and the second should be
MIN_SAT c, d, .1;
The requirements for this optimiation are that the lower bound be zero and the
upper bound less than 1, or the lower bound greater than zero and the upper
bound equal to 1.</pre>
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