[PATCH] D127579: [clang][WIP] add option to keep types of ptr args for non-kernel functions in metadata

[Anastasia Stulova via Phabricator via cfe-commits]

Anastasia added a comment.

In D127579#3588651 <https://reviews.llvm.org/D127579#3588651>, @bader wrote:

>> The way I understand a bitcast instruction in SPIR-V (`OpBitcast` in https://www.khronos.org/registry/SPIR-V/specs/unified1/SPIRV.html#_conversion_instructions) is that it can only apply to pointer types which are distinct from function types. Note that I believe that function pointers are illegal, at least we disallow them in OpenCL.
>
> FYI: we are experimenting with function pointers on Intel HW programmed via SPIR-V. Extension draft - https://github.com/intel/llvm/blob/sycl/sycl/doc/design/spirv-extensions/SPV_INTEL_function_pointers.asciidoc.

Ok, I see. That confirms I am guessing that in the standard SPIR-V binary we won't be able to apply LLVM IR's trick.


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