USM Generic Storage Class - spv_codeplay_usm_generic_storage_class¶
Name Strings¶
SPV_codeplay_usm_generic_storage_class
Contact¶
Aaron Greig, Codeplay Software Ltd. (aaron.greig ‘at’ codeplay.com)
Contributors¶
Aaron Greig, Codeplay Software Ltd.
Ewan Crawford, Codeplay Software Ltd.
Version¶
Last Modified Date |
2020-10-29 |
Revision |
1 |
Status¶
Proposal
Dependencies¶
This extension is written against the Unified SPIR-V Specification, Version 1.5, Revision 3.
This extension requires SPIR-V 1.0.
Overview¶
This extension allows a module to indicate that it is omitting storage class
information from OpTypePointer and OpTypeForwardPointer instructions.
In this case, instead of including storage class information in these
instructions the module passes storage class Generic to indicate that the
storage class has no semantic meaning. Note that modules using this extension do
not need to declare the GenericPointer capability, and pointer types
declared in the manner outlined above do not retain any of the semantics of a
regular Generic pointer type declaration.
Extension Name¶
To use this extension within a SPIR-V module, the following OpExtension must be present in the module:
OpExtension "SPV_codeplay_usm_generic_storage_class"
New Capabilities¶
None.
New Builtins¶
None.
New Instructions¶
None.
Token Number Assignments¶
None.
Modifications to the SPIR-V Specification¶
Modify section 3.7, Storage Class, changing the following entry in the Storage Class table:
8 |
Generic For generic pointers, which overload the Function, Workgroup, and CrossWorkgroup Storage Classes. Also used to declare pointer types without a storage class when the “SPV_codeplay_usm_generic_storage_class” extension is enabled. |
GenericPointer |
Modify section 3.68.8, Memory Instructions, changing the description of
OpVariable:
… Storage Class is the Storage Class of the memory holding the object. It cannot be Generic unless OpExtension “SPV_codeplay_usm_generic_storage_class” was declared. … |
Validation Rules¶
An OpExtension must be added to the SPIR-V for validation layers to check legal use of this extension:
OpExtension "SPV_codeplay_usm_generic_storage_class"
Revision History¶
Rev |
Date |
Author |
Changes |
|---|---|---|---|
1 |
2020/10/29 |
Aaron Greig |
Initial revision |