authors proceed with the discussion of optimization techniques: (I) (2) (3) removal of redundant actions, removal of negated actions, code motion, such as taking an action (node of a graph) that need be executed once, out of a loop, (4) (5) (6) recognition of parallel actions, recognition of fan-out results of actions, filling of timing gaps with possible parallel actions. The authors discuss each of these items at some length, and t h e i r points are valid. The items I - 3 , which hold for general programs and microprograms, are well explained in terms of the graph representation. However, items 4-6 which are c h a r a c t e r i s t i c of microprograms, are concerned with actions inside nodes; the graph representation is not useful for t h e i r discussion. This would seem to indicate something missing in the means of representation. i t is not clear how timing dependencies are represented. The authors' In p a r t i c u l a r , specification of a microaction contains no indication of the times in the cycle of operation at which operands must be present,
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Review of FUNCTIONAL CHARACTERISTICS OF A MULTILINGUAL PROCESSOR by H. W. Lawson and B. K. Smith, IEEE Transactions on Computers, July 1971
Roberts Jr., John D.
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, Volume 2 (4)
Association for Computing Machinery – Jan 1, 1972
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