[SPIR-V] Tracker for missing builtins in the SPIR-V backend

[michalpaszkowski]

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This issue and the following lists serves as a tracker for missing OpenCL/SPIR-V/... builtins discovered while testing the SPIR-V backend. The builtins will be incrementally implemented or fixed.

OpenCL:

• [x] atomic_init()
• [ ] atomic_flag_test_and_set
• [ ] atomic_work_item_fence
• [ ] mem_fence(unsigned int)
• [ ] get_fence(void AS4*)
• [ ] wait_group_events(int, ocl_event AS4*)
• [ ] get_default_queue()
• [x] get_image_num_mip_levels
• [ ] get_image_channel_data_type

SPIR-V:

• [ ] __spirv_Store(int*, int, int, int)
• [ ] __to_global
• [ ] __spirv_CreatePipeFromPipeStorage_write(__spirv_PipeStorage const AS1*)
• [ ] __get_kernel_work_group_size_impl

[llvmbot]

@llvm/issue-subscribers-opencl

[michalpaszkowski]

Two patches implementing atomic_init and get_image_num_mip_levels:

• [SPIR-V] Add atomic_init builtin and fix atomic explicit lowering
• [SPIR-V] Add get_image_num_mip_levels implementation

[michalpaszkowski]

Patch implementing atomic_flag_test_and_set, atomic_flag_test_and_set_explicit, atomic_flag_clear, atomic_flag_clear_explicit:

• [SPIR-V] Add atomic_flag builtin implementation

[iliya-diyachkov]

I'm still working on OpenCL's enqueue_kernel builtin function (it turns into the following calls in LLVM IR: __enqueue_kernel_basic, __enqueue_kernel_basic_events, __enqueue_kernel_events_varargs, __enqueue_kernel_varargs).

[iliya-diyachkov]

OpenCL's enqueue_kernel builtin function was supported:

• [SPIRV] support enqueue_kernel builtin functions

[iliya-diyachkov]

Two SPIR-V's builtin function (__spirv_Load/__spirv_Store) were supported:

• [SPIRV] support __spirv_Load/Store builtin functions