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eliminate to_real coersions to make mixed integer problems easier to digest. Issue #277

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2015-10-30 15:12:21 -07:00
parent 997c3a234d
commit 7838213675
2 changed files with 3 additions and 2 deletions
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2
src/ast/rewriter/arith_rewriter.cpp
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@ -323,7 +323,6 @@ br_status arith_rewriter::mk_le_ge_eq_core(expr * arg1, expr * arg2, op_kind kin
if ((is_zero(arg1) && is_reduce_power_target(arg2, kind == EQ)) ||
(is_zero(arg2) && is_reduce_power_target(arg1, kind == EQ)))
return reduce_power(arg1, arg2, kind, result);
CTRACE("elim_to_real", m_elim_to_real, tout << "after_elim_to_real\n" << mk_ismt2_pp(arg1, m()) << "\n" << mk_ismt2_pp(arg2, m()) << "\n";);
br_status st = cancel_monomials(arg1, arg2, m_arith_lhs, new_arg1, new_arg2);
TRACE("mk_le_bug", tout << "st: " << st << "\n";);
if (st != BR_FAILED) {
@ -335,6 +334,7 @@ br_status arith_rewriter::mk_le_ge_eq_core(expr * arg1, expr * arg2, op_kind kin
if (m_elim_to_real && elim_to_real(arg1, arg2, new_new_arg1, new_new_arg2)) {
arg1 = new_new_arg1;
arg2 = new_new_arg2;
CTRACE("elim_to_real", m_elim_to_real, tout << "after_elim_to_real\n" << mk_ismt2_pp(arg1, m()) << "\n" << mk_ismt2_pp(arg2, m()) << "\n";);
if (st == BR_FAILED)
st = BR_DONE;
}

3
src/opt/opt_context.cpp
View file

@ -137,6 +137,7 @@ namespace opt {
params_ref p;
p.set_bool("model", true);
p.set_bool("unsat_core", true);
p.set_bool("elim_to_real", true);
updt_params(p);
}
@ -661,7 +662,7 @@ namespace opt {
g->assert_expr(fmls[i].get());
}
tactic_ref tac0 =
and_then(mk_simplify_tactic(m),
and_then(mk_simplify_tactic(m, m_params),
mk_propagate_values_tactic(m),
mk_solve_eqs_tactic(m),
// NB: mk_elim_uncstr_tactic(m) is not sound with soft constraints