[PATCH] D39822: [NVPTX] Model (some) side effects of warp-synchronous data exchange intrinsics.

[Artem Belevich via Phabricator via llvm-commits]

tra created this revision.
Herald added subscribers: hiraditya, sanjoy, jholewinski.

Exchanging data across threads in a warp does not access memory, but has side effects (read/write other threads' state).
Previously the intrinsics were marked as IntrNoMem, which resulted in the ops CSI'ed away (PR35249).

This patch marks all such intrinsics as IntrInaccessibleMemOnly which prevents CSI.


https://reviews.llvm.org/D39822

Files:
  llvm/include/llvm/IR/IntrinsicsNVVM.td
  llvm/lib/Target/NVPTX/NVPTXISelDAGToDAG.cpp
  llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp

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