Update SYCL_INTEL_bf16_conversion.asciidoc

[AlexeySotkin]

Align the document with changes made in #4989

[JackAKirk]

Am I right in understanding that there is no reason this proposal can't be implemented for other backends (cuda)?
The intel backend specific element of the implementation seems to be only via the spirv functions __spirv_ConvertFToBF16INTEL and __spirv_ConvertBF16ToFINTEL. Is this correct?

Would it be acceptable for us to add NVPTX backend implementations of these spirv functions?

For example __spirv_ConvertFToBF16INTEL (perhaps suitably renamed?) would call the cuda builtin that performs the conversion using round to nearest even (as per the proposal).

Thanks

[JackAKirk]

Am I right in understanding that there is no reason this proposal can't be implemented for other backends (cuda)? The intel backend specific element of the implementation seems to be only via the spirv functions __spirv_ConvertFToBF16INTEL and __spirv_ConvertBF16ToFINTEL. Is this correct?

Would it be acceptable for us to add NVPTX backend implementations of these spirv functions?

For example __spirv_ConvertFToBF16INTEL (perhaps suitably renamed?) would call the cuda builtin that performs the conversion using round to nearest even (as per the proposal).

Thanks

I think I see that the implementations of the spirv functions that are labelled INTEL are hidden. I think I understand that they will remain intel specific: in this case, and assuming that this extension could be generalized, what would be the preferred way of generalizing this extension to support other vendor's backends? A higher level spirv function that would call INTEL labelled spirv/other backend specific spirv depending on the backend compiled for?

Thanks

[JackAKirk]

I made/tested an example draft oneapi namespace extension supporting CUDA here: #5393

[rdeodhar]

OK, I've updated the PR to remove from_bits() and raw() and kept the other changes.

[gmlueck]

OK, I've updated the PR to remove from_bits() and raw() and kept the other changes.

It looks like from_bits and raw are still in the synopsis.

This PR also needs to be merged with the main branch and updated. The extension spec is now at "sycl/doc/extensions/experimental/sycl_ext_oneapi_bfloat16.asciidoc".

[rdeodhar]

Moved the required changes to "sycl/doc/extensions/experimental/sycl_ext_oneapi_bfloat16.asciidoc".

[MrSidims]

Closing in favor of #6524 .