Automated Deduction - CADE-21: 21st International Conference by Frank Pfenning

By Frank Pfenning

A veritable one-stop-shop for a person trying to wake up to hurry on what's happening within the box of automatic deduction instantly. This e-book comprises the refereed complaints of the twenty first overseas convention on automatic Deduction, CADE-21, held in Bremen, Germany, in July 2007. The 28 revised complete papers and six procedure descriptions provided have been chosen from sixty four submissions. All present facets of computerized deduction are addressed, starting from theoretical and methodological concerns to presentation and assessment of theorem provers and logical reasoning systems.

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Extra resources for Automated Deduction - CADE-21: 21st International Conference on Automated Deduction, Bremen, Germany, July 17-20, 2007, Proceedings (Lecture Notes in Computer Science)

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When encountering a memory variable in later phases, we need to generate code that will restore its value from the memory to a register (the vˆ in rule restore will be assigned a register by the subsequent application of rule assgn reg). Saving is necessary not only when registers are spilled, but also when functions are called. Our compiler adopts the caller-save convention, so every function call is assumed to destroy the values of all registers. Therefore, we need to, as implemented in the caller save rule, save the values of all registers that are live at that point.

T as being in binding position. Note that a schematic rule may contain the same variable in binding and non-binding positions (One4 and Type3 are examples). 42 C. Urban, S. Berghofer, and M. Norrish Assuming an inductive definition of the predicate R, the schematic rule in (7) must be of the form R ts 1 . . R ts n S1 ss 1 . . Sm ss m R ts (8) where the predicates Si ss i (the ones different from R) stand for the sideconditions in the schematic rule. For proving our main result in the next section it is convenient to introduce several auxiliary notions for schematic terms and rules.

It requires that x does not appear free in e2 (thus the execution of expression e1 is unnecessary). [atom let] let x = atom v in e[x] ←→ e[v] [flatten let] let x = (let y = e1 in e2 [y]) in e3 [x, y] ←→ let y = e1 in let x = e2 [y] in e3 [x, y] [useless let] let x = e1 in e2 ←→ e2 Constant Folding. After some optimization, an expression may include only constant values, thus creating new opportunities for constant folding. This is accomplished by invoking a decision procedure for unquantified Presburger arithmetic, plus the application of other relevant rules such as if true and if false.

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