# VK_KHR_shader_subgroup_uniform_control_flow(3) Manual Page

## Name

VK_KHR_shader_subgroup_uniform_control_flow - device extension

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## Registered Extension Number

324

## Revision

1

## Ratification Status

Ratified

## Extension and Version Dependencies

Vulkan Version 1.1

## SPIR-V Dependencies

- SPV_KHR_subgroup_uniform_control_flow

## Contact

- Alan Baker [GitHub]alan-baker

## Other Extension Metadata

Last Modified Date

  2020-08-27

IP Status

  No known IP claims.

Interactions and External Dependencies

  - Requires SPIR-V 1.3.

  - This extension provides API support for `GL_EXT_subgroupuniform_qualifier`

Contributors

  - Alan Baker, Google

  - Jeff Bolz, NVIDIA

## Description

This extension allows the use of the `SPV_KHR_subgroup_uniform_control_flow` SPIR-V extension in shader modules. `SPV_KHR_subgroup_uniform_control_flow` provides stronger guarantees that diverged subgroups will reconverge.

Developers should utilize this extension if they use subgroup operations to reduce the work performed by a uniform subgroup. This extension will guarantee that uniform subgroup will reconverge in the same manner as invocation groups (see “Uniform Control Flow” in the Khronos SPIR-V Specification).

## New Structures

- Extending VkPhysicalDeviceFeatures2, VkDeviceCreateInfo:

  - VkPhysicalDeviceShaderSubgroupUniformControlFlowFeaturesKHR

## New Enum Constants

- `VK_KHR_SHADER_SUBGROUP_UNIFORM_CONTROL_FLOW_EXTENSION_NAME`

- `VK_KHR_SHADER_SUBGROUP_UNIFORM_CONTROL_FLOW_SPEC_VERSION`

- Extending VkStructureType:

  - `VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_SUBGROUP_UNIFORM_CONTROL_FLOW_FEATURES_KHR`

## Version History

- Revision 1, 2020-08-27 (Alan Baker)

  - Internal draft version

## See Also

No cross-references are available

## 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.

## Copyright

Copyright 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0