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outline scheme

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
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Nikolaj Bjorner 2022-12-15 14:57:52 -08:00
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src/ast/simplifiers/solve_eqs.cpp
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@ -13,6 +13,24 @@ Author:
Nikolaj Bjorner (nbjorner) 2022-11-2.
Notes:
extract_subst is inefficient.
It traverses the same sub-terms many times.
Outline of a presumably better scheme:
1. maintain map FV: term -> bit-set where bitset reprsents set of free variables. Assume the number of variables is bounded.
FV is built from initial terms.
2. maintain parent: term -> term-list of parent occurrences.
3. repeat
pick x = t, such that x not in FV(t)
orient x -> t
for p in parent*(x):
FV(p) := FV(p) u FV(t)
if y = s is processed and x in FV(s) order y < x
if y = s is processed and x in FV(t) order x < y
--*/