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[mlir][vector] Add build method for vector.to_elements #145114

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[mlir][vector] Add build method for vector.to_elements #145114

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8c4d201
add to_elements builder that infers the scalar type(s)
newling Jun 20, 2025
cb8453b
clang-format
newling Jun 20, 2025
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11 changes: 9 additions & 2 deletions mlir/include/mlir/Dialect/Vector/IR/VectorOps.td
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Original file line number Diff line number Diff line change
Expand Up @@ -798,7 +798,7 @@ def Vector_ToElementsOp : Vector_Op<"to_elements", [
This operation decomposes all the scalar elements from a vector. The
decomposed scalar elements are returned in row-major order. The number of
scalar results must match the number of elements in the input vector type.
All the result elements have the same result type, which must match the
All the result elements have the same type, which must match the
element type of the input vector. Scalable vectors are not supported.

Examples:
Expand All @@ -813,7 +813,7 @@ def Vector_ToElementsOp : Vector_Op<"to_elements", [
// %0#0 = %v1[0]
// %0#1 = %v1[1]

// Decompose a 2-D.
// Decompose a 2-D vector.
%0:6 = vector.to_elements %v2 : vector<2x3xf32>
// %0#0 = %v2[0, 0]
// %0#1 = %v2[0, 1]
Expand All @@ -835,6 +835,13 @@ def Vector_ToElementsOp : Vector_Op<"to_elements", [

let arguments = (ins AnyVectorOfAnyRank:$source);
let results = (outs Variadic<AnyType>:$elements);


let builders = [
// Build method that infers the result types from `elements`.
OpBuilder<(ins "Value":$elements)>,
];

let assemblyFormat = "$source attr-dict `:` type($source)";
let hasFolder = 1;
}
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9 changes: 9 additions & 0 deletions mlir/lib/Dialect/Vector/IR/VectorOps.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2417,6 +2417,15 @@ LogicalResult ToElementsOp::fold(FoldAdaptor adaptor,
return foldToElementsFromElements(*this, results);
}

void vector::ToElementsOp::build(OpBuilder &builder, OperationState &result,
Value elements) {
auto vectorType = cast<VectorType>(elements.getType());
Type elementType = vectorType.getElementType();
int64_t nbElements = vectorType.getNumElements();
SmallVector<Type> scalarTypes(nbElements, elementType);
build(builder, result, scalarTypes, elements);
}

//===----------------------------------------------------------------------===//
// FromElementsOp
//===----------------------------------------------------------------------===//
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