[libc-commits] [PATCH] D149897: [libc][rpc] Update locking to work on volta

[Jon Chesterfield via Phabricator via libc-commits]

JonChesterfield created this revision.
JonChesterfield added reviewers: jhuber6, jdoerfert.
Herald added subscribers: libc-commits, kosarev, mattd, asavonic, ecnelises, kerbowa, tschuett, jvesely.
Herald added projects: libc-project, All.
JonChesterfield requested review of this revision.

Carefully work around not knowing the thread mask that nvptx intrinsic
functions require.

If the warp is converged when calling try_lock, a single rpc call will handle
all lanes within it. Otherwise more than one rpc call with thread masks that
compose to the unknown one will occur.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149897

Files:
  libc/src/__support/CPP/atomic.h
  libc/src/__support/GPU/amdgpu/utils.h
  libc/src/__support/GPU/generic/utils.h
  libc/src/__support/GPU/nvptx/utils.h
  libc/src/__support/RPC/rpc.h

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