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Progress with new BTOR backend

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This commit is contained in:
Clifford Wolf 2017-11-23 08:28:29 +01:00
parent 6ee305553a
commit e41dcaa759
1 changed files with 109 additions and 8 deletions
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117
backends/btor/btor.cc
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@ -53,6 +53,11 @@ struct BtorWorker
// bit to driving cell
dict<SigBit, Cell*> bit_cell;
// nids for constants
dict<Const, int> consts;
pool<Cell*> cell_recursion_guard;
int get_bv_sid(int width)
{
if (sorts_bv.count(width) == 0) {
@ -63,7 +68,57 @@ struct BtorWorker
return sorts_bv.at(width);
}
int get_sig_nid(SigSpec 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"))
{
string btor_op;
if (cell->type == "$add") btor_op = "add";
if (cell->type == "$sub") btor_op = "sub";
log_assert(!btor_op.empty());
int width = GetSize(cell->getPort("\\Y"));
width = std::max(width, GetSize(cell->getPort("\\A")));
width = std::max(width, GetSize(cell->getPort("\\B")));
bool a_signed = cell->hasParam("\\A_SIGNED") ? cell->getParam("\\A_SIGNED").as_bool() : false;
bool b_signed = cell->hasParam("\\B_SIGNED") ? cell->getParam("\\B_SIGNED").as_bool() : false;
int sid = get_bv_sid(width);
int nid_a = get_sig_nid(cell->getPort("\\A"), width, a_signed);
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);
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);
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);
goto okay;
}
log_error("Unsupported cell type: %s\n", log_id(cell));
okay:
cell_recursion_guard.erase(cell);
}
int get_sig_nid(SigSpec sig, int to_width = -1, bool is_signed = false)
{
sigmap.apply(sig);
@ -79,8 +134,33 @@ struct BtorWorker
if (bit_nid.count(bit) == 0)
{
// FIXME
log_abort();
if (bit.wire == nullptr)
{
Const c(bit.data);
while (i+GetSize(c) < GetSize(sig) && sig[i+GetSize(c)].wire == nullptr)
c.bits.push_back(sig[i+GetSize(c)].data);
if (consts.count(c) == 0) {
int sid = get_bv_sid(GetSize(c));
int nid = next_nid++;
f << stringf("%d const %d %s\n", nid, sid, c.as_string().c_str());
consts[c] = nid;
}
int nid = consts.at(c);
for (int j = 0; j < GetSize(c); j++)
nidbits.push_back(make_pair(nid, j));
i += GetSize(c)-1;
continue;
}
else
{
export_cell(bit_cell.at(bit));
log_assert(bit_nid.count(bit));
}
}
nidbits.push_back(bit_nid.at(bit));
@ -124,7 +204,28 @@ struct BtorWorker
nid_width[nid] = width;
}
return sig_nid.at(sig);
int nid = sig_nid.at(sig);
if (to_width >= 0 && to_width != GetSize(sig))
{
if (to_width < GetSize(sig))
{
int sid = get_bv_sid(to_width);
int nid2 = next_nid++;
f << stringf("%d slice %d %d %d 0\n", nid2, sid, nid, to_width-1);
nid = nid2;
}
else
{
int sid = get_bv_sid(to_width);
int nid2 = next_nid++;
f << stringf("%d %s %d %d %d\n", nid2, is_signed ? "sext" : "uext",
sid, nid, to_width - GetSize(sig));
nid = nid2;
}
}
return nid;
}
BtorWorker(std::ostream &f, RTLIL::Module *module, bool verbose) :
@ -188,10 +289,10 @@ struct BtorBackend : public Backend {
size_t argidx;
for (argidx = 1; argidx < args.size(); argidx++)
{
if (args[argidx] == "-verbose") {
verbose = true;
continue;
}
// if (args[argidx] == "-verbose") {
// verbose = true;
// continue;
// }
break;
}
extra_args(f, filename, args, argidx);