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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - SpvOpFOrdEqual doesn't return correct results for NaNs"
href="https://bugs.freedesktop.org/show_bug.cgi?id=104905">104905</a>
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<th>Summary</th>
<td>SpvOpFOrdEqual doesn't return correct results for NaNs
</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>All
</td>
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<th>OS</th>
<td>All
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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
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<th>Component</th>
<td>Drivers/Vulkan/radeon
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<th>Assignee</th>
<td>mesa-dev@lists.freedesktop.org
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<th>Reporter</th>
<td>joseph.kucia@gmail.com
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<th>QA Contact</th>
<td>mesa-dev@lists.freedesktop.org
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<p>
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<pre>SpvOpFOrdEqual doesn't seem to perform ordered comparison, e.g. NaN and 1.0
gives true. I expect this to also be a problem for other ordered comparison
SPIR-V opcodes.
Mesa SPIR-V to NIR translator inserts additional nir_feq instructions in order
to detect NaNs, but those instructions are probably optimized out by LLVM.
The problem can be reproduced by running VKD3D tests:
<a href="https://source.winehq.org/git/vkd3d.git/blob/HEAD:/tests/d3d12.c#l6640">https://source.winehq.org/git/vkd3d.git/blob/HEAD:/tests/d3d12.c#l6640</a>
I can write a standalone test case, if needed.</pre>
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