[all-commits] [llvm/llvm-project] b13237: [libc][rpc] Update locking to work on volta

Jon Chesterfield via All-commits all-commits at lists.llvm.org
Thu May 4 14:31:42 PDT 2023

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b1323738649e96aac943f3773ec7336df110eea5
  Author: Jon Chesterfield <jonathanchesterfield at gmail.com>
  Date:   2023-05-04 (Thu, 04 May 2023)

  Changed paths:
    M libc/src/__support/CPP/atomic.h
    M libc/src/__support/GPU/amdgpu/utils.h
    M libc/src/__support/GPU/generic/utils.h
    M libc/src/__support/GPU/nvptx/utils.h
    M libc/src/__support/RPC/rpc.h
    M libc/src/__support/RPC/rpc_util.h

  Log Message:
  [libc][rpc] Update locking to work on volta

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.

Reviewed By: jhuber6

Differential Revision: https://reviews.llvm.org/D149897

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