By Van Roy P.
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Extra resources for 1983-1993.The wonder years of sequential Prolog implementation
For Aquarius the code size reduction is greater than the performance improvement. This is partly due to the lack of structure and list types in the Aquarius domain, which means that run-time type tests are still needed. For Parma the code size reduction is about the same as the performance improvement. A second conclusion can be drawn regarding the types that are most useful for the compiler. Deriving types that have a logical meaning is not sufficient. Performance increases significantly when the analysis is able to derive types that have only an operational meaning, such as dereference (reference chains), trailing, and aliasing-related types (uninitialized variables).
Aquarius supports a further specialization: the “uninitialized register” variable. This idea is Research Report No. 36 December 1993 26 Peter Van Roy due to Bruce Holmer. This variable is an output that is passed in a register. No memory is allocated for uninitialized registers, unlike standard uninitialized variables. This reduces the space advantage of unsafe variables. 6 In principle, all uninitialized variables can be transformed into uninitialized registers. 4) only a subset is transformed .
A new instruction, neck, is added. If a partial choice point exists when neck is executed, then the remaining registers are filled in. Two entry points are created for each clause: one when there are alternative clauses, and one where there are none. A neck instruction is only included in the first case. In SICStus, this algorithm results in a performance improvement of 7% to 15% for four large programs, at a cost of a 5% to 10% increase in code size. Hickey and Mudambi  present compilation algorithms to generate a tree of tests and to minimize work done in backtracking.
1983-1993.The wonder years of sequential Prolog implementation by Van Roy P.