Contact
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Kevin Petit [GitHub]kpet 
Other Extension Metadata
- Last Modified Date
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2025-04-16 
- IP Status
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No known IP claims. 
- Contributors
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Kévin Petit, Arm Ltd. 
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Stu Smith, AMD 
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Jeff Bolz, NVIDIA 
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Craig Graham, Samsung 
 
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Description
This extension enables support for 8-bit floating-point data types as defined in SPV_EXT_float8.
New Enum Constants
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VK_EXT_SHADER_FLOAT8_EXTENSION_NAME
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VK_EXT_SHADER_FLOAT8_SPEC_VERSION
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Extending VkStructureType: - 
VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_FLOAT8_FEATURES_EXT
 
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If VK_KHR_cooperative_matrix is supported:
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Extending VkComponentTypeKHR: - 
VK_COMPONENT_TYPE_FLOAT8_E4M3_EXT
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VK_COMPONENT_TYPE_FLOAT8_E5M2_EXT
 
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Issues
1) Resolve interactions with the changes VK_KHR_shader_float16 makes to rules for denorm flushing (always allowed by default for all FP formats). How to describe the requirement to preserve subnormals?
+ RESOLVED: Subnormals are always preserved when converting FP8 values to IEEE 754 binary 16. In all other cases, subnormals may be flushed to zero.
+
Document Notes
For more information, see the Vulkan Specification
This page is a generated document. Fixes and changes should be made to the generator scripts, not directly.