[all-commits] [llvm/llvm-project] b7b28e: [NVPTX] Improve copy avoidance during lowering. (#...

[Artem Belevich via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b7b28e770c461b2513ddc98953c6e019cb2f29a4
      https://github.com/llvm/llvm-project/commit/b7b28e770c461b2513ddc98953c6e019cb2f29a4
  Author: Artem Belevich <tra at google.com>
  Date:   2024-09-11 (Wed, 11 Sep 2024)

  Changed paths:
    M llvm/lib/Target/NVPTX/NVPTXLowerArgs.cpp
    M llvm/lib/Target/NVPTX/NVPTXSubtarget.h
    M llvm/test/CodeGen/NVPTX/lower-args-gridconstant.ll
    M llvm/test/CodeGen/NVPTX/lower-byval-args.ll

  Log Message:
  -----------
  [NVPTX] Improve copy avoidance during lowering. (#106423)

On newer GPUs, where `cvta.param` instruction is available we can avoid
making byval arguments when their pointers are used in a few more cases, 
even when `__grid_constant__` is not specified.

- phi
- select
- memcpy from the parameter.

Switched pointer traversal from a DIY implementation to PtrUseVisitor.



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