[libc-commits] [PATCH] D148943: [libc] Enable multiple threads to use RPC on the GPU

[Joseph Huber via Phabricator via libc-commits]

jhuber6 updated this revision to Diff 516819.
jhuber6 added a comment.

Update some names and allocate the proper amount of memory.

Also this adds a hack to work around a problem with the optimizer. The GPU
executes groups of threads in SIMD style. This means that basic blocks turn into
thread masks. THe problem was occuring when the optimizer would sink the common
'close()` call to release the thread lock until after another open call within
the same lane. This can be seen in this https://godbolt.org/z/cfEr4n5TE. There
is some ongoing work to make this actually work on AMD but for now it's a hack
to prevent these function calls from being merged. It has a performance penalty,
but it's minor.


Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D148943/new/

https://reviews.llvm.org/D148943

Files:
  libc/src/__support/RPC/CMakeLists.txt
  libc/src/__support/RPC/rpc.h
  libc/src/__support/RPC/rpc_util.h
  libc/startup/gpu/amdgpu/start.cpp
  libc/startup/gpu/nvptx/start.cpp
  libc/test/integration/startup/gpu/CMakeLists.txt
  libc/test/integration/startup/gpu/rpc_test.cpp
  libc/utils/gpu/loader/Loader.h
  libc/utils/gpu/loader/Server.h
  libc/utils/gpu/loader/amdgpu/Loader.cpp
  libc/utils/gpu/loader/nvptx/Loader.cpp

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