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<th>Priority</th>
<td>medium
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<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - Repeated function call gives HUGE increases to compile time"
href="https://bugs.freedesktop.org/show_bug.cgi?id=70613">70613</a>
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<th>Assignee</th>
<td>idr@freedesktop.org
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<th>Summary</th>
<td>Repeated function call gives HUGE increases to compile time
</td>
</tr>
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
</tr>
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<th>Classification</th>
<td>Unclassified
</td>
</tr>
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<th>OS</th>
<td>Linux (All)
</td>
</tr>
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<th>Reporter</th>
<td>kevin.rogovin@intel.com
</td>
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<th>Hardware</th>
<td>x86-64 (AMD64)
</td>
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<th>Status</th>
<td>NEW
</td>
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<th>Version</th>
<td>9.1
</td>
</tr>
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<th>Component</th>
<td>Drivers/DRI/i965
</td>
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<th>Product</th>
<td>Mesa
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=87818" name="attach_87818" title="30 second compile.">attachment 87818</a> <a href="attachment.cgi?id=87818&action=edit" title="30 second compile.">[details]</a></span>
30 second compile.
Attached are two fragment shaders which have various noise functions within
them.
fast_compile.frag.glsl takes Mesa about half a second to compile and link.
slow_compile.frag.glsl takes Mesa aboit half a MINUTE to compile and link.
The only difference between the two's source code is that the former defines a
macro GREY_SCALE_NOISE. With that macro in place, calling the noise function,
pnoise(vec4, vec4) happens only oncse. Without the macro it calls it 3 times,
with different arguments, for each of red, green and blue.</pre>
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