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ensure atomic constraints are processed by arithmetic solver

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This commit is contained in:
Nikolaj Bjorner 2025-07-26 12:52:48 -07:00
parent 0528c86905
commit 8e1a528796
1 changed files with 6 additions and 5 deletions
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11
src/ast/rewriter/seq_axioms.cpp
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@ -1246,15 +1246,16 @@ namespace seq {
// len(extract(y, o, l)) = o + l - len(y) if o <= len(y) < o + l
expr_ref len_y(mk_len(y), m);
expr_ref z(a.mk_int(0), m);
expr_ref y_ge_l(a.mk_ge(len_y, a.mk_add(offs, l)), m);
expr_ref y_ge_o(a.mk_ge(len_y, offs), m);
expr_ref offs_ge_0(a.mk_ge(offs, z), m);
expr_ref l_ge_0(a.mk_ge(l, z), m);
expr_ref y_ge_l = mk_ge(a.mk_sub(len_y, a.mk_add(offs, l)), 0);
expr_ref y_ge_o = mk_ge(a.mk_sub(len_y, offs), 0);
expr_ref offs_ge_0 = mk_ge(offs, 0);
expr_ref l_ge_0 = mk_ge(l, 0);
add_clause(~offs_ge_0, ~l_ge_0, ~y_ge_l, mk_eq(n, l));
add_clause(offs_ge_0, mk_eq(n, z));
add_clause(l_ge_0, mk_eq(n, z));
add_clause(y_ge_o, mk_eq(n, z));
add_clause(~y_ge_o, y_ge_l, mk_eq(n, a.mk_sub(a.mk_add(offs, l), len_y)));
add_clause(~y_ge_o, y_ge_l, mk_eq(n, a.mk_sub(a.mk_add(offs, l), len_y)));
}
else if (seq.str.is_unit(x) ||
seq.str.is_empty(x) ||