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Progress in new BTOR back-end

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This commit is contained in:
Clifford Wolf 2017-11-23 18:14:53 +01:00
parent 388e7a7740
commit cc2495d48d
1 changed files with 74 additions and 16 deletions
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90
backends/btor/btor.cc
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@ -56,6 +56,9 @@ struct BtorWorker
// nids for constants
dict<Const, int> consts;
// ff inputs that need to be evaluated (<nid>, <d>)
vector<pair<int, SigSpec>> ff_todo;
pool<Cell*> cell_recursion_guard;
int get_bv_sid(int width)
@ -68,16 +71,26 @@ struct BtorWorker
return sorts_bv.at(width);
}
void add_nid_sig(int nid, const SigSpec &sig)
{
for (int i = 0; i < GetSize(sig); i++)
bit_nid[sig[i]] = make_pair(nid, i);
sig_nid[sig] = nid;
nid_width[nid] = GetSize(sig);
}
void export_cell(Cell *cell)
{
log_assert(cell_recursion_guard.count(cell) == 0);
cell_recursion_guard.insert(cell);
if (cell->type.in("$add", "$sub"))
if (cell->type.in("$add", "$sub", "$xor"))
{
string btor_op;
if (cell->type == "$add") btor_op = "add";
if (cell->type == "$sub") btor_op = "sub";
if (cell->type == "$xor") btor_op = "xor";
log_assert(!btor_op.empty());
int width = GetSize(cell->getPort("\\Y"));
@ -92,27 +105,62 @@ struct BtorWorker
int nid_b = get_sig_nid(cell->getPort("\\B"), width, b_signed);
int nid = next_nid++;
f << stringf("%d %s %d %d %d\n", nid, btor_op.c_str(), sid, nid_a, nid_b);
f << stringf("%d %s %d %d %d ; %s\n", nid, btor_op.c_str(), sid, nid_a, nid_b, log_id(cell));
SigSpec sig = sigmap(cell->getPort("\\Y"));
if (GetSize(sig) < width) {
int sid = get_bv_sid(GetSize(sig));
int nid2 = next_nid++;
f << stringf("%d slice %d %d %d 0\n", nid2, sid, nid, GetSize(sig)-1);
f << stringf("%d slice %d %d %d 0 ; %s\n", nid2, sid, nid, GetSize(sig)-1, log_id(cell));
nid = nid2;
}
for (int i = 0; i < GetSize(sig); i++)
bit_nid[sig[i]] = make_pair(nid, i);
sig_nid[sig] = nid;
nid_width[nid] = GetSize(sig);
add_nid_sig(nid, sig);
goto okay;
}
log_error("Unsupported cell type: %s\n", log_id(cell));
if (cell->type.in("$mux", "$_MUX_"))
{
SigSpec sig_a = sigmap(cell->getPort("\\A"));
SigSpec sig_b = sigmap(cell->getPort("\\B"));
SigSpec sig_s = sigmap(cell->getPort("\\S"));
SigSpec sig_y = sigmap(cell->getPort("\\Y"));
int nid_a = get_sig_nid(sig_a);
int nid_b = get_sig_nid(sig_b);
int nid_s = get_sig_nid(sig_s);
int sid = get_bv_sid(GetSize(sig_y));
int nid = next_nid++;
f << stringf("%d ite %d %d %d %d ; %s\n", nid, sid, nid_s, nid_b, nid_a, log_id(cell));
add_nid_sig(nid, sig_y);
goto okay;
}
if (cell->type.in("$dff", "$ff", "$_DFF_P_", "$_DFF_N", "$_FF_"))
{
SigSpec sig_d = sigmap(cell->getPort("\\D"));
SigSpec sig_q = sigmap(cell->getPort("\\Q"));
string symbol = log_signal(sig_q);
if (symbol.find(' ') != string::npos)
symbol = log_id(cell);
if (symbol[0] == '\\')
symbol = symbol.substr(1);
int sid = get_bv_sid(GetSize(sig_q));
int nid = next_nid++;
f << stringf("%d state %d %s ; %s\n", nid, sid, symbol.c_str(), log_id(cell));
ff_todo.push_back(make_pair(nid, sig_d));
add_nid_sig(nid, sig_q);
goto okay;
}
log_error("Unsupported cell type: %s (%s)\n", log_id(cell->type), log_id(cell));
okay:
cell_recursion_guard.erase(cell);
@ -146,6 +194,7 @@ struct BtorWorker
int nid = next_nid++;
f << stringf("%d const %d %s\n", nid, sid, c.as_string().c_str());
consts[c] = nid;
nid_width[nid] = GetSize(c);
}
int nid = consts.at(c);
@ -182,7 +231,7 @@ struct BtorWorker
int nid3 = nid2;
if (lower != 0 && upper+1 != nid_width.at(nid2)) {
if (lower != 0 || upper+1 != nid_width.at(nid2)) {
int sid = get_bv_sid(upper-lower+1);
nid3 = next_nid++;
f << stringf("%d slice %d %d %d %d\n", nid3, sid, nid, upper, lower);
@ -241,11 +290,7 @@ struct BtorWorker
int nid = next_nid++;
f << stringf("%d input %d %s\n", nid, sid, log_id(wire));
for (int i = 0; i < GetSize(sig); i++)
bit_nid[sig[i]] = make_pair(nid, i);
sig_nid[sig] = nid;
nid_width[nid] = GetSize(sig);
add_nid_sig(nid, sig);
}
for (auto cell : module->cells())
@ -266,6 +311,19 @@ struct BtorWorker
int nid = get_sig_nid(wire);
f << stringf("%d output %d %s\n", next_nid++, nid, log_id(wire));
}
while (!ff_todo.empty())
{
vector<pair<int, SigSpec>> todo;
todo.swap(ff_todo);
for (auto &it : todo)
{
int nid = get_sig_nid(it.second);
int sid = get_bv_sid(GetSize(it.second));
f << stringf("%d next %d %d %d\n", next_nid++, sid, it.first, nid);
}
}
}
};