Victor Perez d45de8003a [MLIR][GPU-LLVM] Convert gpu.func to llvm.func (#101664) ...

Add support in `-convert-gpu-to-llvm-spv` to convert `gpu.func` to
`llvm.func` operations.

- `spir_kernel`/`spir_func` calling conventions used for
kernels/functions.
- `workgroup` attributions encoded as additional `llvm.ptr<3>`
arguments.
- No attribute used to annotate kernels
- `reqd_work_group_size` attribute using to encode
`gpu.known_block_size`.
- `llvm.mlir.workgroup_attrib_size` used to encode workgroup attribution
sizes. This will be attached to the pointer argument workgroup
attributions lower to.

**Note**: A notable missing feature that will be addressed in a
follow-up PR is a `-use-bare-ptr-memref-call-conv` option to replace
MemRef arguments with bare pointers to the MemRef element types instead
of the current MemRef descriptor approach.

---------

Signed-off-by: Victor Perez <victor.perez@codeplay.com>

2024-08-09 16:09:11 +02:00

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