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[MLIR][XeGPU] Fix isEvenlyDistributable API in xegpu #164907

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Merged
merged 1 commit into from
Oct 27, 2025
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[MLIR][XeGPU] Fix isEvenlyDistributable API in xegpu #164907

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7 changes: 5 additions & 2 deletions mlir/lib/Dialect/XeGPU/IR/XeGPUDialect.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -113,9 +113,12 @@ bool XeGPUDialect::isEvenlyDistributable(llvm::ArrayRef<int64_t> shape,
if (layout.size() != shape.size())
return std::nullopt;
auto ratio = computeShapeRatio(shape, layout);
if (!ratio.has_value())
if (ratio.has_value()) {
newShape = ratio.value();
} else if (!rr || !computeShapeRatio(layout, shape).has_value()) {
return std::nullopt;
newShape = ratio.value();
}
// Round-robin case: continue with original newShape
}

if (data.size()) {
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7 changes: 7 additions & 0 deletions mlir/test/Dialect/XeGPU/xegpu-wg-to-sg-unify-ops.mlir
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Expand Up @@ -527,4 +527,11 @@ gpu.module @test_distribution {
%cst_1 = arith.constant {layout_result_0 = #xegpu.layout<sg_layout = [32, 1], sg_data = [1, 16]>} dense<[[0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]]> : vector<1x16xindex>
gpu.return
}

// CHECK-LABEL: scalar_broadcast
gpu.func @scalar_broadcast(%arg0: index) {
// CHECK: vector.broadcast {{.*}} : index to vector<1x1x1xindex>
%broadcast = vector.broadcast %arg0 {layout_result_0 = #xegpu.layout<sg_layout = [4, 8, 1], sg_data = [1, 1, 1]>} : index to vector<4x1x1xindex>
gpu.return
}
}