[clang][CodeGen][SPIRV] Translate `amdgpu_flat_work_group_size` into `max_work_group_size`. (#116820)

HIPAMD relies on the `amdgpu_flat_work_group_size` attribute to
implement key functionality such as the `__launch_bounds__` `__global__`
function annotation. This attribute is not available / directly
translatable to SPIR-V, hence as it is AMDGCN flavoured SPIR-V suffers
from information loss.

This patch addresses that limitation by converting the unsupported
attribute into the `max_work_group_size` attribute which maps to
[`MaxWorkgroupSizeINTEL`](https://github.com/KhronosGroup/SPIRV-Registry/blob/main/extensions/INTEL/SPV_INTEL_kernel_attributes.asciidoc),
which is available in / handled by SPIR-V. When reverse translating from
SPIR-V to AMDGCN LLVMIR we invert the map and add the original AMDGPU
attribute.

0 files changed, 0 insertions, 0 deletions