SPV_QCOM_subgroup_size

SPV_QCOM_subgroup_size

To report problems with this extension, please open a new issue at:

https://github.com/KhronosGroup/SPIRV-Headers

Copyright (c) 2024 The Khronos Group Inc. Copyright terms at http://www.khronos.org/registry/speccopyright.html

This extension is written against the SPIR-V Specification, Version 1.6 Revision 6.

This extension requires SPIR-V 1.1.

This extension adds two new execution modes with which an application executes subgroup operations in a shader or kernel. Shaders/kernels with the "half" execution mode will run with half the maximum subgroup size the implementation supports. Similarly, those with "full" will run with the maximum subgroup size the implementation supports. In case where a shader/kernel enables the extension, but has neither of the execution modes, the implementation selects the either full or half the maximum subgroup size it supports.

To use this extension within a SPIR-V module, the following OpExtension must be present in the module:

This extension introduces the following new capability:

The extension adds the following new execution modes.

An OpExtension must be added to the SPIR-V for validation layers to check legal use of this extension:

A shader or kernel must not specify both the SubgroupSizeHalfQCOM and SubgroupSizeFullQCOM execution modes.