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fuzz fixes to semantics

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2023-12-13 17:19:16 -08:00
parent 236ec01b78
commit e5375c4071
1 changed files with 12 additions and 11 deletions
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23
src/sat/smt/intblast_solver.cpp
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@ -146,6 +146,7 @@ namespace intblast {
auto a = expr2literal(e);
auto b = mk_literal(r);
ctx.mark_relevant(b);
// verbose_stream() << "add-predicate-axiom: " << mk_pp(e, m) << " == " << r << "\n";
add_equiv(a, b);
}
return true;
@ -625,7 +626,7 @@ namespace intblast {
case OP_BUDIV:
case OP_BUDIV_I: {
expr* x = arg(0), * y = umod(e, 1);
r = m.mk_ite(m.mk_eq(y, a.mk_int(0)), a.mk_int(1), a.mk_idiv(x, y));
r = m.mk_ite(m.mk_eq(y, a.mk_int(0)), a.mk_int(-1), a.mk_idiv(x, y));
break;
}
case OP_BUMUL_NO_OVFL: {
@ -727,10 +728,9 @@ namespace intblast {
r = m.mk_ite(m.mk_eq(umod(bv_expr, 0), umod(bv_expr, 1)), a.mk_int(1), a.mk_int(0));
break;
case OP_BSMOD_I:
case OP_BSMOD: {
bv_expr = e;
expr* x = umod(bv_expr, 0), *y = umod(bv_expr, 1);
rational N = rational::power_of_two(bv.get_bv_size(bv_expr));
case OP_BSMOD: {
expr* x = umod(e, 0), *y = umod(e, 1);
rational N = bv_size(e);
expr* signx = a.mk_ge(x, a.mk_int(N/2));
expr* signy = a.mk_ge(y, a.mk_int(N/2));
expr* u = a.mk_mod(x, y);
@ -750,22 +750,23 @@ namespace intblast {
}
case OP_BSDIV_I:
case OP_BSDIV: {
// d = udiv(x mod N, y mod N)
// d = udiv(abs(x), abs(y))
// y = 0, x > 0 -> 1
// y = 0, x <= 0 -> -1
// x = 0, y != 0 -> 0
// x < 0, y < 0 -> -d
// x > 0, y < 0 -> -d
// x < 0, y > 0 -> -d
// x > 0, y > 0 -> d
// x < 0, y < 0 -> d
bv_expr = e;
expr* x = umod(bv_expr, 0), * y = umod(bv_expr, 1);
rational N = rational::power_of_two(bv.get_bv_size(bv_expr));
expr* x = umod(e, 0), * y = umod(e, 1);
rational N = bv_size(e);
expr* signx = a.mk_ge(x, a.mk_int(N / 2));
expr* signy = a.mk_ge(y, a.mk_int(N / 2));
x = m.mk_ite(signx, a.mk_sub(a.mk_int(N), x), x);
y = m.mk_ite(signy, a.mk_sub(a.mk_int(N), y), y);
expr* d = a.mk_idiv(x, y);
r = m.mk_ite(m.mk_iff(signx, signy), d, a.mk_uminus(d));
r = m.mk_ite(m.mk_eq(y, a.mk_int(0)), m.mk_ite(signx, a.mk_int(-1), a.mk_int(1)), r);
r = m.mk_ite(m.mk_eq(y, a.mk_int(0)), m.mk_ite(signx, a.mk_int(1), a.mk_int(-1)), r);
break;
}
case OP_BSREM_I: