feat/blase: align parser semantics to parse sext/zext into extended widths from SMT-LIB.#1975
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feat/blase: align parser semantics to parse sext/zext into extended widths from SMT-LIB.#1975
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…idths from SMT-LIB.
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… precondition checks (#1976) SMT-LIB defines its semantics of PBV over `Int`, and makes zero extend, sign extend, and extract partial functions when the widths are negative. In contract, we define our semantics of PBV over nat. To bridge this gap, we define an interpretation of the SMT-LIB semantics where all subtractions are assumed to not result in negative numbers. That is, for any subterm `(w - v)`, we introduce a width precondition `w >= v`. Under this regime, our naive BMC solver correctly provides UNSAT for all of the PBV Alive dataset, showing that this is a sensible semantics. The PBV solver, leaves the cases when these happen as uninterpreted, one assumes, as per their spec. Moreover, this strategy of adding preconditions. Stacked on #1975.
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This fixes our encoding of pzero_extend and psign_extend to align with SMT-LIB standard.