Add vec16 types for short types

[Maetveis]

The cl_intel_subgroups_short extension added support for 16-wide vectors via #906. Update cl_intel_subgroup_local_block_io as well, to explicitly document that 16-wide vectors are supported for pointers to the local address space, also.

Only raise the minor version, treating this a doc clarification only. The Intel implementation already supports 16-wide vectors for the local address space.

[CLAassistant]

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[bashbaug]

Thanks for updating this!

Since I was confused for a bit: the cl_intel_subgroups_short extension added support for 16-wide vectors via #906. This PR updates cl_intel_subgroup_local_block_io as well, to explicitly document that 16-wide vectors are supported for pointers to the local address space, also.

I'm wondering if we need to explicitly rev the cl_intel_subgroup_local_block_io extension to add this support, though, based on:

This extension extends the subgroup block read and write functions defined by cl_intel_subgroups (and, when supported, cl_intel_subgroups_char, cl_intel_subgroups_short, and cl_intel_subgroups_long) to support reading from and writing to pointers to the __local memory address space in addition to pointers to the __global memory address space.

It also looks like the commit that added support for 16-wide vectors added it for both the global address space and the local address space.

If so, perhaps:

1. We can keep this extension (cl_intel_subgroup_local_block_io) as version 1.0, perhaps revving only the patch version (so 1.0.1).
2. Clarify that "For extension version 1.1 or newer" is referring to the cl_intel_subgroups_short extension and not this extension.

Then, drivers do not need to be updated to safely access this functionality.

What do you think?

[Maetveis]

Thanks for updating this!

Since I was confused for a bit: the cl_intel_subgroups_short extension added support for 16-wide vectors via #906. This PR updates cl_intel_subgroup_local_block_io as well, to explicitly document that 16-wide vectors are supported for pointers to the local address space, also.

Sorry for being so brief on the description, I wanted to get this posted yesterday, but didn't have the time to properly explain.

I'm wondering if we need to explicitly rev the cl_intel_subgroup_local_block_io extension to add this support, though, based on:

This extension extends the subgroup block read and write functions defined by cl_intel_subgroups (and, when supported, cl_intel_subgroups_char, cl_intel_subgroups_short, and cl_intel_subgroups_long) to support reading from and writing to pointers to the __local memory address space in addition to pointers to the __global memory address space.

It also looks like the commit that added support for 16-wide vectors added it for both the global address space and the local address space.

If so, perhaps:

1. We can keep this extension (cl_intel_subgroup_local_block_io) as version 1.0, perhaps revving only the patch version (so 1.0.1).
2. Clarify that "For extension version 1.1 or newer" is referring to the cl_intel_subgroups_short extension and not this extension.

Then, drivers do not need to be updated to safely access this functionality.

What do you think?

Sounds good to me. For context, I was looking into adding the declarations of these functions to the clang builtin header opencl-c.h and that's when I spotted that the __local 16 wide variants are not explicitly documented.

[bashbaug]

LGTM, thanks!

Just FYI, no action required: I updated the copyright date and the version in the document header also, consistent with the change to the revision history table.