[all-commits] [llvm/llvm-project] c4119d: [Clang][AMDGPU] Avoid Using `byval` for `ndrange_t...

[Shilei Tian via All-commits]

  Branch: refs/heads/users/shiltian/no-byval-amdgpu
  Home:   https://github.com/llvm/llvm-project
  Commit: c4119d6abab8f9d734581e5b53223afe759498c0
      https://github.com/llvm/llvm-project/commit/c4119d6abab8f9d734581e5b53223afe759498c0
  Author: Shilei Tian <i at tianshilei.me>
  Date:   2024-11-15 (Fri, 15 Nov 2024)

  Changed paths:
    M clang/lib/CodeGen/CGBuiltin.cpp
    M clang/test/CodeGenOpenCL/amdgpu-enqueue-kernel.cl

  Log Message:
  -----------
  [Clang][AMDGPU] Avoid Using `byval` for `ndrange_t` when emitting `__enqueue_kernel_basic`

AMDGPU disabled the use of `byval` for struct argument passing in commit
d77c620. However, when emitting `__enqueue_kernel_basic`, Clang still adds the
`byval` attribute by default. This PR introduces a target check to avoid
emitting the `byval` attribute unnecessarily.

FWIW, I’m not sure if it’s a good idea to emit the `byval` attribute by default
in this context. The way arguments are passed is highly target-dependent, and
making assumptions here doesn’t seem ideal.



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