https://bugs.freedesktop.org/show_bug.cgi?id=104905
Bug ID: 104905
Summary: SpvOpFOrdEqual doesn't return correct results for NaNs
Product: Mesa
Version: git
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Vulkan/radeon
Assignee: mesa-dev@lists.freedesktop.org
Reporter: joseph.ku...@gmail.com
QA Contact: mesa-dev@lists.freedesktop.org
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:
https://source.winehq.org/git/vkd3d.git/blob/HEAD:/tests/d3d12.c#l6640
I can write a standalone test case, if needed.
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