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add option to rewrite and for arithmetic simplification

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This commit is contained in:
Nikolaj Bjorner 2022-09-18 17:17:47 -07:00
parent 088898834c
commit bd4db4c41f
5 changed files with 47 additions and 10 deletions
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25
src/ast/rewriter/arith_rewriter.cpp
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@ -706,6 +706,31 @@ br_status arith_rewriter::mk_eq_core(expr * arg1, expr * arg2, expr_ref & result
return st;
}
br_status arith_rewriter::mk_and_core(unsigned n, expr* const* args, expr_ref& result) {
if (n <= 1)
return BR_FAILED;
expr* x, * y, * z, * u;
rational a, b;
if (m_util.is_le(args[0], x, y) && m_util.is_numeral(x, a)) {
expr* arg0 = args[0];
ptr_buffer<expr> rest;
for (unsigned i = 1; i < n; ++i) {
if (m_util.is_le(args[i], z, u) && u == y && m_util.is_numeral(z, b)) {
if (b > a)
arg0 = args[i];
}
else
rest.push_back(args[i]);
}
if (rest.size() < n - 1) {
rest.push_back(arg0);
result = m().mk_and(rest);
return BR_REWRITE1;
}
}
return BR_FAILED;
}
bool arith_rewriter::mk_eq_mod(expr* arg1, expr* arg2, expr_ref& result) {
expr* x = nullptr, *y = nullptr, *z = nullptr, *u = nullptr;
rational p, k, l;