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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - dEQP-VK tests running very long time"
href="https://bugs.freedesktop.org/show_bug.cgi?id=110432">110432</a>
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<th>Summary</th>
<td>dEQP-VK tests running very long time
</td>
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<th>Product</th>
<td>Mesa
</td>
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<th>Version</th>
<td>git
</td>
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<th>Hardware</th>
<td>Other
</td>
</tr>
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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/DRI/i965
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<th>Assignee</th>
<td>intel-3d-bugs@lists.freedesktop.org
</td>
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<th>Reporter</th>
<td>lemody@gmail.com
</td>
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<th>QA Contact</th>
<td>intel-3d-bugs@lists.freedesktop.org
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<p>
<div>
<pre>Some of the dEQP-VK tests spend a lot of time in compiler. In particular these
2 ones are heavily affected:
dEQP-VK.spirv_assembly.instruction.graphics.8bit_storage.32struct_to_8struct.storage_buffer_sint_geom
dEQP-VK.spirv_assembly.instruction.graphics.8bit_storage.32struct_to_8struct.storage_buffer_uint_geom
Normally with old Mesa take take 2-3 secs to complete but with current git I
measured today 38 minutes 43 seconds (!)
I've bisected this to following commit:
-------------- 8< -----------------------------
commit b031c643491a92a5574c7a4bd659df33f2d89bb6
Author: Ian Romanick <<a href="mailto:ian.d.romanick@intel.com">ian.d.romanick@intel.com</a>>
Date: Thu Jan 17 17:53:40 2019 -0800
nir: Convert a bcsel with only phi node sources to a phi node
v2: Remove the original ALU instruciton after all of its readers are
modified to read the new ALU instruction.
v3: Fix an issue where a bcsel that may not be executed on a loop
iteration due to a break statement is converted to a phi (and therefore
incorrectly "executed"). Noticed by Tim.
Bugzilla: <a class="bz_bug_link
bz_status_VERIFIED bz_closed"
title="VERIFIED FIXED - 4-27% performance drop in Vulkan benchmarks"
href="show_bug.cgi?id=109216">https://bugs.freedesktop.org/show_bug.cgi?id=109216</a>
Fixes: 8fb8ebfbb05 ("intel/compiler: More peephole select")
Reviewed-by: Timothy Arceri <<a href="mailto:tarceri@itsqueeze.com">tarceri@itsqueeze.com</a>></pre>
</div>
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