VK_KHR_shader_subgroup_uniform_control_flow

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