[libc-commits] [PATCH] D149398: [libc] Add support for global ctors / dtors for AMDGPU

[Joseph Huber via Phabricator via libc-commits]

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This patch makes the necessary changes to support calling global
constructors and destructors on the GPU. The patch in D149340 <https://reviews.llvm.org/D149340> allows the
`lld` linker to create the symbols pointing us to these globals. These
should be executed by a single thread, which is more difficult on the
GPU because all threads are active. I chose to use an atomic counter to
sync every thread on the GPU. This is very slow if you use more than a
few thousand threads, but for testing purposes it should be sufficient.

Depends on D149340 <https://reviews.llvm.org/D149340> D149363 <https://reviews.llvm.org/D149363>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149398

Files:
  libc/startup/gpu/amdgpu/CMakeLists.txt
  libc/startup/gpu/amdgpu/start.cpp
  libc/test/integration/startup/gpu/CMakeLists.txt
  libc/test/integration/startup/gpu/init_fini_array_test.cpp

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