VK_ARM_shader_core_builtins

Other Extension Metadata

Last Modified Date

2022-10-05

Interactions and External Dependencies

• This extension provides API support for GL_ARM_shader_core_builtins

Contributors

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

Description

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 optimization purposes. A typical optimization 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.

New Structures

• Extending VkPhysicalDeviceFeatures2, VkDeviceCreateInfo:
  • VkPhysicalDeviceShaderCoreBuiltinsFeaturesARM
• Extending VkPhysicalDeviceProperties2:
  • VkPhysicalDeviceShaderCoreBuiltinsPropertiesARM

New Enum Constants

• VK_ARM_SHADER_CORE_BUILTINS_EXTENSION_NAME
• VK_ARM_SHADER_CORE_BUILTINS_SPEC_VERSION
• Extending VkStructureType:
  • VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_CORE_BUILTINS_FEATURES_ARM
  • VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_CORE_BUILTINS_PROPERTIES_ARM

New or Modified Built-In Variables

• CoreCountARM
• CoreMaxIDARM
• CoreIDARM
• WarpsMaxIDARM
• WarpIDARM

New SPIR-V Capabilities

• CoreBuiltinsARM

Issues

None.

Version History

• Revision 1, 2022-10-05 (Kevin Petit)
  • Initial revision
• Revision 2, 2022-10-26 (Kevin Petit)
  • Add shaderCoreMask property