int64_t rank) {
  DenseIntElementsAttr attrs;
  if (!matchPattern(value, m_Constant(&attrs)) ||
      attrs.getType().getRank() != 0) {
    return std::nullopt;
  }
  int64_t axis = attrs.getValues<IntegerAttr>()[0].getInt();
  return axis < 0 ? axis + rank : axis;
}

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