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Added SAT undef model for $pmux and $safe_pmux

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This commit is contained in:
Clifford Wolf 2014-01-02 19:58:59 +01:00
parent 0759c97748
commit 1f80557ade
1 changed files with 19 additions and 4 deletions
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23
kernel/satgen.h
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@ -299,6 +299,9 @@ struct SatGen
std::vector<int> b = importDefSigSpec(cell->connections.at("\\B"), timestep);
std::vector<int> s = importDefSigSpec(cell->connections.at("\\S"), timestep);
std::vector<int> y = importDefSigSpec(cell->connections.at("\\Y"), timestep);
std::vector<int> yy = model_undef ? ez->vec_var(y.size()) : y;
std::vector<int> tmp = a;
for (size_t i = 0; i < s.size(); i++) {
std::vector<int> part_of_b(b.begin()+i*a.size(), b.begin()+(i+1)*a.size());
@ -306,12 +309,24 @@ struct SatGen
}
if (cell->type == "$safe_pmux")
tmp = ez->vec_ite(ez->onehot(s, true), tmp, a);
ez->assume(ez->vec_eq(tmp, y));
ez->assume(ez->vec_eq(tmp, yy));
if (model_undef) {
log("FIXME: No SAT undef model cell type %s!\n", RTLIL::id2cstr(cell->type));
if (model_undef)
{
std::vector<int> undef_a = importUndefSigSpec(cell->connections.at("\\A"), timestep);
std::vector<int> undef_b = importUndefSigSpec(cell->connections.at("\\B"), timestep);
std::vector<int> undef_s = importUndefSigSpec(cell->connections.at("\\S"), timestep);
std::vector<int> undef_y = importUndefSigSpec(cell->connections.at("\\Y"), timestep);
ez->assume(ez->NOT(ez->expression(ezSAT::OpOr, undef_y)));
tmp = a;
for (size_t i = 0; i < s.size(); i++) {
std::vector<int> part_of_undef_b(undef_b.begin()+i*a.size(), undef_b.begin()+(i+1)*a.size());
tmp = ez->vec_ite(s.at(i), part_of_undef_b, tmp);
}
tmp = ez->vec_ite(ez->onehot(s, true), tmp, cell->type == "$safe_pmux" ? a : std::vector<int>(tmp.size(), ez->TRUE));
tmp = ez->vec_ite(ez->expression(ezSAT::OpOr, undef_s), std::vector<int>(tmp.size(), ez->TRUE), tmp);
ez->assume(ez->vec_eq(tmp, undef_y));
undefGating(y, yy, undef_y);
}
return true;
}