Ada 95 Quality and Style Guide | Chapter 10 |
10.5.5 Order of Array Processingguideline
Use column-first processing of two-dimensional arrays when measured performance indicates. example
type Table_Type is array (Row_Min .. Row_Max, Col_Min .. Col_Max) of ... Table : Table_Type; ... -- Row-order processing for Row in Row_Min .. Row_Max loop for Col in Col_Min .. Col_Max loop -- Process Table (Row, Col) end loop; end loop; -- Column-order processing for Col in Col_Min .. Col_Max loop for Row in Row_Min .. Row_Max loop -- Process Table (Row, Col) end loop; end loop;rationale
Determine the impact of processing two-dimensional arrays in row-major order versus column-major order. While most Ada compilers are likely to use row-major order, it is not a requirement. In the presence of good optimization, there may be no significant difference in the above examples. Using static array bounds is also likely to be significant here. See Guidelines 10.4.1 and 10.4.2.
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