This extension provides the ability to determine device-specific properties on Arm GPUs. It exposes properties for the number of shader cores, the maximum number of warps that can run on a shader core, and shader builtins to enable invocations to identify which core and warp a shader invocation is executing on.

This extension enables support for the SPIR-V CoreBuiltinsARM capability.

These properties and built-ins can be used for debugging or performance optimisation purposes. A typical optimisation example would be to use CoreIDARM to select a per-shader-core instance of a data structure in algorithms that use atomics so as to reduce contention.

VK_ARM_shader_core_builtins

Name String

VK_ARM_shader_core_builtins

Extension Type

Device extension

Registered Extension Number

498

Revision

2

Extension and Version Dependencies

VK_KHR_get_physical_device_properties2

Contact

• Kevin Petit kpet

Other Extension Metadata

Last Modified Date

2022-10-05

Interactions and External Dependencies

• This extension requires SPV_ARM_core_builtins.
• This extension provides API support for GL_ARM_shader_core_builtins

Contributors

• Kevin Petit, Arm Ltd.
• Jan-Harald Fredriksen, Arm Ltd.