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[MLIR] Avoid vector.extract_strided_slice when not needed #115941

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Merged
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Nov 12, 2024
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[MLIR] Avoid vector.extract_strided_slice when not needed #115941

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7 changes: 7 additions & 0 deletions mlir/lib/Dialect/Vector/Transforms/VectorEmulateNarrowType.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -150,6 +150,13 @@ static Value staticallyExtractSubvector(OpBuilder &rewriter, Location loc,
assert((vectorType.getRank() == 1 && extractType.getRank() == 1) &&
"expected 1-D source and destination types");
(void)vectorType;
assert(frontOffset + subvecSize <= vectorType.getNumElements() &&
"subvector out of bounds");

// do not need extraction if the subvector size is the same as the source
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@kuhar kuhar Nov 13, 2024

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nit: Use proper sentences in code comments: https://llvm.org/docs/CodingStandards.html#commenting

if (vectorType.getNumElements() == subvecSize)
return source;

auto offsets = rewriter.getI64ArrayAttr({frontOffset});
auto sizes = rewriter.getI64ArrayAttr({subvecSize});
auto strides = rewriter.getI64ArrayAttr({1});
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