By John R. Pierce
Covers encoding and binary digits, entropy, language and which means, effective encoding and the noisy channel, and explores ways that details conception pertains to physics, cybernetics, psychology, and artwork. "Uncommonly good...the such a lot enjoyable dialogue to be found." - clinical American. 1980 variation.
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Similar techniques have also been developed by Tirrell [319] and Simoneaux [309], and in their survey Ganapathi et al. [150] describe another state machine-based compiler called U GEN, which was derived from a virtual machine called U- CODE [280]. Further Improvements In 1975, Snyder [310] implemented one of the first fully operational and portable C compilers, where the target machine-dependent parts could be automatically generated from a machine description. The design is similar to Miller’s in that the frontend first transforms the program into an equivalent representation for an abstract machine.
In 1965, McKeeman [254] advocated the use of a simple but often neglected program optimization procedure which, as a post-step to code generation, inspects a small sequence of instructions in the assembly code and attempts to combine two or more adjacent instructions with a single instruction. Similar ideas were also suggested by Lowry and Medlock [243] around the same time. 5 Because of its narrow window of observation, this technique became known as peephole optimization. Modeling Instructions with Register Transfer Lists Since this kind of optimization is tailored for a particular target machine, the earliest implementations were (and still often are) done ad hoc and by hand.
In comparison to Wasilew, Weingart’s design is centered around a single tree of patterns—Weingart called this a discrimination net—which is automatically derived from a declarative machine description. Using a single tree of patterns, Weingart argued, allows for a compact and efficient means of representing the pattern set. The process of building the AST is then extended to simultaneously push each new AST node onto a stack. In tandem, the discrimination net is progressively traversed by comparing the nodes on the stack against the children of the current node in the net.