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bounds axiom tuning

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2014-08-31 11:48:00 -07:00
parent 37b96a6133
commit 7f49135b3b
1 changed files with 21 additions and 10 deletions
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31
src/smt/theory_arith_core.h
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@ -855,37 +855,48 @@ namespace smt {
}
if (kind1 == A_LOWER) {
if (lo_inf) {
// k1 > lo_inf, k1 <= x => lo_inf <= x
// k1 >= lo_inf, k1 <= x => lo_inf <= x
mk_clause(~l1, lit1, 3, coeffs);
}
if (lo_sup) {
// k1 < lo_sup, lo_sup <= x => k1 <= x
// k1 <= lo_sup, lo_sup <= x => k1 <= x
mk_clause(l1, ~lit2, 3, coeffs);
}
if (hi_inf) {
// k1 > hi_inf, k1 <= x => ~(x <= hi_inf)
mk_clause(~l1, ~lit3, 3, coeffs);
// k1 == hi_inf, k1 <= x or x <= hi_inf
if (k1 == *hi_inf) {
mk_clause(l1, lit3, 3, coeffs);
}
else {
// k1 > hi_inf, k1 <= x => ~(x <= hi_inf)
mk_clause(~l1, ~lit3, 3, coeffs);
}
}
if (hi_sup) {
// k1 < hi_sup, k1 <= x or x <= hi_sup
// k1 <= hi_sup, k1 <= x or x <= hi_sup
mk_clause(l1, lit4, 3, coeffs);
}
}
else {
if (lo_inf) {
// k1 > lo_inf, ~(k1 >= x) => lo_inf <= x
// k1 >= lo_inf, k1 >= x or lo_inf <= x
mk_clause(l1, lit1, 3, coeffs);
}
if (lo_sup) {
// k1 < lo_sup, lo_sup <= x => ~(x <= k1)
mk_clause(~l1, ~lit2, 3, coeffs);
if (k1 == *lo_sup) {
mk_clause(l1, lit2, 3, coeffs);
}
else {
// k1 < lo_sup, lo_sup <= x => ~(x <= k1)
mk_clause(~l1, ~lit2, 3, coeffs);
}
}
if (hi_inf) {
// k1 > hi_inf, x <= hi_inf => x <= k1
// k1 >= hi_inf, x <= hi_inf => x <= k1
mk_clause(l1, ~lit3, 3, coeffs);
}
if (hi_sup) {
// k1 < hi_sup, ~(x <= k1) or x <= hi_sup
// k1 <= hi_sup , x <= k1 => x <= hi_sup
mk_clause(~l1, lit4, 3, coeffs);
}
}