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cheap eqs

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Signed-off-by: Lev Nachmanson <levnach@hotmail.com>
This commit is contained in:
Lev Nachmanson 2020-06-10 15:02:40 -07:00
parent 50b9915c57
commit 94263167ec
3 changed files with 17 additions and 34 deletions
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33
src/math/lp/lp_bound_propagator.h
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@ -319,8 +319,7 @@ public:
void cheap_eq_table(unsigned rid) {
TRACE("cheap_eqs", tout << "checking if row " << rid << " can propagate equality.\n"; display_row_info(rid, tout););
unsigned x;
unsigned y;
unsigned x, y;
mpq k;
if (is_offset_row(rid, x, y, k)) {
if (y == null_lpvar) {
@ -358,41 +357,28 @@ public:
unsigned row_id;
var_offset key(y, k);
if (m_var_offset2row_id.find(key, row_id)) {
if (row_id == rid) {
// it is the same row.
if (row_id == rid) { // it is the same row.
return;
}
unsigned x2;
unsigned y2;
unsigned x2, y2;
mpq k2;
if (is_offset_row(row_id, x2, y2, k2)) {
bool new_eq = false;
#ifdef _TRACE
bool swapped = false;
#endif
if (y == y2 && k == k2) {
new_eq = true;
}
else if (y2 != null_lpvar) {
#ifdef _TRACE
swapped = true;
#endif
std::swap(x2, y2);
k2.neg();
if (y == y2 && k == k2) {
else if (y2 != null_lpvar && x2 == y && k == - k2) {
std::swap(x2, y2);
new_eq = true;
}
}
if (new_eq) {
if (!is_equal(x, x2) && is_int(x) == is_int(x2)) {
SASSERT(y == y2 && k == k2);
// SASSERT(y == y2 && k == k2 );
explanation ex;
explain_fixed_in_row(rid, ex);
explain_fixed_in_row(row_id, ex);
TRACE("arith_eq", tout << "propagate eq two rows:\n";
tout << "swapped: " << swapped << "\n";
tout << "x : v" << x << "\n";
tout << "x2 : v" << x2 << "\n";
display_row_info(rid, tout);
@ -400,10 +386,9 @@ public:
add_eq_on_columns(ex, x, x2);
}
return;
}
}
}
}
// the original row was deleted or it is not offset row anymore ===> remove it from table
m_var_offset2row_id.erase(key);
}
// add new entry
m_var_offset2row_id.insert(key, rid);