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Progress in SMV back-end

This commit is contained in:
Clifford Wolf 2015-06-15 13:24:17 +02:00
parent ea23bb8aa4
commit 0f01ef61ef
1 changed files with 85 additions and 7 deletions
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92
backends/smv/smv.cc
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@ -38,6 +38,7 @@ struct SmvWorker
int idcounter;
dict<IdString, shared_str> idcache;
pool<shared_str> used_names;
vector<shared_str> strbuf;
const char *cid()
{
@ -54,16 +55,23 @@ struct SmvWorker
{
if (!idcache.count(id))
{
string name = log_id(id);
string name = stringf("_%s", id.c_str());
if (name.substr(0, 2) == "_\\")
name = "_" + name.substr(2);
for (auto &c : name) {
if (c == '|' || c == '$' || c == '_') continue;
if (c >= 'a' && c <='z') continue;
if (c >= 'A' && c <='Z') continue;
if (c >= '0' && c <='9') continue;
if (precache) return nullptr;
c = '_';
c = '#';
}
if (name == "_main")
name = "main";
while (used_names.count(name))
name += "_";
@ -92,7 +100,7 @@ struct SmvWorker
}
}
string rvalue(SigSpec sig)
const char *rvalue(SigSpec sig)
{
string s;
sigmap.apply(sig);
@ -109,11 +117,15 @@ struct SmvWorker
s += c.data.at(i) == State::S1 ? '1' : '0';
}
}
return s;
strbuf.push_back(s);
return strbuf.back().c_str();
}
string lvalue(SigSpec sig)
const char *lvalue(SigSpec sig)
{
sigmap.apply(sig);
if (sig.is_wire())
return rvalue(sig);
@ -132,13 +144,79 @@ struct SmvWorker
for (auto cell : module->cells())
{
if (cell->type.in("$add", "$sub", "$mul", "$div", "$mod", "$and", "$or", "$xor", "$xnor"))
{
int width = GetSize(cell->getPort("\\Y"));
string expr_a, expr_b, op;
if (cell->type == "$add") op = "+";
if (cell->type == "$sub") op = "-";
if (cell->type == "$mul") op = "*";
if (cell->type == "$div") op = "/";
if (cell->type == "$mod") op = "%";
if (cell->type == "$and") op = "&";
if (cell->type == "$or") op = "|";
if (cell->type == "$xor") op = "xor";
if (cell->type == "$xnor") op = "xnor";
if (cell->getParam("\\A_SIGNED").as_bool())
{
expr_a = stringf("resize(signed(%s), %d)", rvalue(cell->getPort("\\A")), width);
expr_b = stringf("resize(signed(%s), %d)", rvalue(cell->getPort("\\B")), width);
assignments.push_back(stringf("%s := unsigned(%s %s %s);", lvalue(cell->getPort("\\Y")), expr_a.c_str(), op.c_str(), expr_b.c_str()));
}
else
{
expr_a = stringf("resize(%s, %d)", rvalue(cell->getPort("\\A")), width);
expr_b = stringf("resize(%s, %d)", rvalue(cell->getPort("\\B")), width);
assignments.push_back(stringf("%s := %s %s %s;", lvalue(cell->getPort("\\Y")), expr_a.c_str(), op.c_str(), expr_b.c_str()));
}
continue;
}
if (cell->type.in("$eq", "$ne", "$lt", "$le", "$ge", "$gt"))
{
int width = std::max(GetSize(cell->getPort("\\A")), GetSize(cell->getPort("\\B")));
string expr_a, expr_b, op;
if (cell->type == "$eq") op = "=";
if (cell->type == "$ne") op = "!=";
if (cell->type == "$lt") op = "<";
if (cell->type == "$le") op = "<=";
if (cell->type == "$ge") op = ">=";
if (cell->type == "$gt") op = ">";
if (cell->getParam("\\A_SIGNED").as_bool())
{
expr_a = stringf("resize(signed(%s), %d)", rvalue(cell->getPort("\\A")), width);
expr_b = stringf("resize(signed(%s), %d)", rvalue(cell->getPort("\\B")), width);
}
else
{
expr_a = stringf("resize(%s, %d)", rvalue(cell->getPort("\\A")), width);
expr_b = stringf("resize(%s, %d)", rvalue(cell->getPort("\\B")), width);
}
assignments.push_back(stringf("%s := resize(word1(%s %s %s), %d);", lvalue(cell->getPort("\\Y")),
expr_a.c_str(), op.c_str(), expr_b.c_str(), GetSize(cell->getPort("\\Y"))));
continue;
}
if (cell->type == "$dff")
{
assignments.push_back(stringf("next(%s) := %s;", lvalue(cell->getPort("\\Q")), rvalue(cell->getPort("\\D"))));
continue;
}
f << stringf(" %s : %s;\n", cid(cell->name), cid(cell->type));
for (auto &conn : cell->connections())
if (cell->output(conn.first))
assignments.push_back(stringf("%s := %s.%s;", lvalue(conn.second).c_str(), cid(cell->name), cid(conn.first)));
assignments.push_back(stringf("%s := %s.%s;", lvalue(conn.second), cid(cell->name), cid(conn.first)));
else
assignments.push_back(stringf("%s.%s := %s;", cid(cell->name), cid(conn.first), rvalue(conn.second).c_str()));
assignments.push_back(stringf("%s.%s := %s;", cid(cell->name), cid(conn.first), rvalue(conn.second)));
}
f << stringf(" ASSIGN\n");