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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - llc version 4.0 and later takes up to 45 times as long to compile shader code for Mesa"
href="https://bugs.llvm.org/show_bug.cgi?id=34647">34647</a>
</td>
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<th>Summary</th>
<td>llc version 4.0 and later takes up to 45 times as long to compile shader code for Mesa
</td>
</tr>
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<th>Product</th>
<td>new-bugs
</td>
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<th>Version</th>
<td>4.0
</td>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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<th>OS</th>
<td>Linux
</td>
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<th>Status</th>
<td>NEW
</td>
</tr>
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<th>Severity</th>
<td>normal
</td>
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<th>Priority</th>
<td>P
</td>
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<th>Component</th>
<td>new bugs
</td>
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<th>Assignee</th>
<td>unassignedbugs@nondot.org
</td>
</tr>
<tr>
<th>Reporter</th>
<td>bcrocker@redhat.com
</td>
</tr>
<tr>
<th>CC</th>
<td>llvm-bugs@lists.llvm.org
</td>
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<p>
<div>
<pre>Created <span class=""><a href="attachment.cgi?id=19167" name="attach_19167" title="Vertex shader bytecode">attachment 19167</a> <a href="attachment.cgi?id=19167&action=edit" title="Vertex shader bytecode">[details]</a></span>
Vertex shader bytecode
The Piglit (OpenGL test suite) ext_transform_feedback-max-varyings test
utilizes somewhat unusual shader programs (both vertex and fragment shaders).
The llc compiler prior to 4.0 compiled these programs in
not-unacceptable times of 0.078 seconds for a representative
vertex shader and 2.6-4.5 seconds for a representative fragment shader.
The V4.0 and later llc takes a MUCH longer time to compile the same
code: 1.66 seconds for the vertex shader (a factor of 20 times slower!)
and 1 minute 55 seconds for the fragment shader (a factor of 25-45 times
slower!).
I will attach sample vertex shader code (ir_draw_llvm_vs_variant0.bc)
and fragment shader code (ir_fs914_variant0.bc).
The target architecture is PPC64LE.</pre>
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