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fixing #4670 (#4682)

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* fixing #4670

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* init

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* arrays

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* arrays

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* arrays

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>

* na

Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-09-10 04:35:11 -07:00 • committed by GitHub
parent ee00542e76
commit cfa7c733db
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48 changed files with 1591 additions and 359 deletions
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62
src/test/tbv.cpp
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@ -74,7 +74,69 @@ static void tst2(unsigned num_bits) {
}
}
// prints all don't care pareto fronts for 8-bit multiplier.
static void test_dc() {
unsigned a = 0;
unsigned b = 0;
unsigned num_bits = 8;
unsigned num_vals = 1 << num_bits;
tbv_manager m(num_bits*2);
tbv::eq eq(m);
tbv::hash hash(m);
ptr_vector<tbv> tbvs, todo;
map<tbv*, tbit, tbv::hash, tbv::eq> eval(hash, eq);
for (unsigned a = 0; a < num_vals; ++a) {
for (unsigned b = 0; b < num_vals; ++b) {
unsigned c = a*b;
unsigned bits = a + (b << num_bits);
bool value = (c & (1 << (num_bits-1))) != 0;
tbv* t = m.allocate(bits);
tbvs.push_back(t);
eval.insert(t, value ? BIT_1 : BIT_0);
todo.push_back(t);
}
}
std::cout << todo.size() << "\n";
for (unsigned i = 0; i < todo.size(); ++i) {
tbv* t = todo[i];
todo.pop_back();
bool found = false;
tbit tvalue = eval[t];
SASSERT(tvalue != BIT_z);
for (unsigned j = 0; j < 2*num_bits; ++j) {
tbit tb = (*t)[j];
if (tb == BIT_x)
continue;
tbv* nt = m.allocate(*t);
tbvs.push_back(nt);
m.set(*nt, j, neg(tb));
if (!eval.contains(nt))
continue;
tbit nvalue = eval[nt];
m.set(*nt, j, BIT_x);
if (eval.contains(nt))
continue;
if (tvalue == nvalue) {
todo.push_back(nt);
eval.insert(nt, tvalue);
found = true;
}
else
eval.insert(nt, BIT_z);
}
if (!found)
m.display(std::cout, *t) << " := " << (eval[t] == BIT_0 ? 0 : 1) << "\n";
}
for (auto* t : tbvs)
m.deallocate(t);
}
void tst_tbv() {
// test_dc();
tst0();
tst1(31);