[all-commits] [llvm/llvm-project] a800ff: [mlir][gpu] Disjoint patterns for lowering cluster...

[Andrea Faulds via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: a800ffac4115259a76d803512eda31e4de787570
      https://github.com/llvm/llvm-project/commit/a800ffac4115259a76d803512eda31e4de787570
  Author: Andrea Faulds <andrea.faulds at amd.com>
  Date:   2024-09-18 (Wed, 18 Sep 2024)

  Changed paths:
    M mlir/include/mlir/Dialect/GPU/Transforms/Passes.h
    M mlir/lib/Dialect/GPU/Transforms/SubgroupReduceLowering.cpp
    M mlir/test/lib/Dialect/GPU/TestGpuRewrite.cpp

  Log Message:
  -----------
  [mlir][gpu] Disjoint patterns for lowering clustered subgroup reduce (#109158)

Making the existing populateGpuLowerSubgroupReduceToShufflePatterns()
function also cover the new "clustered" subgroup reductions is proving
to be inconvenient, because certain backends may have more specific
lowerings that only cover the non-clustered type, and this creates pass
ordering constraints. This commit removes coverage of clustered
reductions from this function in favour of a new separate function,
which makes controlling the lowering much more straightforward.



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