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add nullable propagation instead of waiting for length assignment

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-06-06 11:32:43 -07:00
parent 1b9fcc7098
commit 65b6ccd651
2 changed files with 72 additions and 23 deletions
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4
src/smt/seq_regex.h
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@ -59,6 +59,10 @@ namespace smt {
bool block_unfolding(literal lit, unsigned i);
void propagate_nullable(literal lit, expr* e, expr* s, unsigned idx, expr* r);
bool propagate_derivative(literal lit, expr* e, expr* s, expr* i, unsigned idx, expr* r);
expr_ref mk_first(expr* r);
expr_ref unroll_non_empty(expr* r, expr_mark& seen, unsigned depth);