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mb-skolem for arithmetic with model repair

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The contract is that users of mb-skolem ensure that
interface equalities are preserved (by adding a
sufficient set of disequalities, such as a chain
x1 < x2 < x3 .., to force that solutions for
x_i does not clash).

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-06-14 17:13:10 -07:00 • committed by Arie Gurfinkel
parent a0af3383db
commit baa96909cc
5 changed files with 34 additions and 13 deletions
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12
src/math/simplex/model_based_opt.cpp
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@ -51,7 +51,8 @@ namespace opt {
m_div = -v.m_coeff;
}
}
m_coeff = r.m_coeff - r.m_value;
m_coeff = r.m_coeff;
if (r.m_type == opt::t_lt) m_coeff += m_div;
normalize();
SASSERT(m_div.is_pos());
}
@ -983,7 +984,7 @@ namespace opt {
}
else {
result = def();
result.m_coeff = eval(x);
m_var2value[x] = rational::zero();
}
SASSERT(eval(result) == eval(x));
}
@ -1008,8 +1009,8 @@ namespace opt {
else {
result = def(m_rows[glb_index], x);
}
m_var2value[x] = eval(result);
#endif
SASSERT(eval(result) == eval(x));
}
// The number of matching lower and upper bounds is small.
@ -1106,7 +1107,8 @@ namespace opt {
}
def result = project(y, compute_def);
if (compute_def) {
result = (result * D) + u;
result = (result * D) + u;
m_var2value[x] = eval(result);
}
SASSERT(!compute_def || eval(result) == eval(x));
return result;
@ -1204,7 +1206,7 @@ namespace opt {
def result;
if (compute_def) {
result = def(m_rows[row_id1], x);
SASSERT(eval(result) == eval(x));
m_var2value[x] = eval(result);
}
retire_row(row_id1);
return result;