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Progress in SMV back-end

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This commit is contained in:
Clifford Wolf 2015-06-16 19:05:26 +02:00
parent ed128b82d7
commit b8c5e27006
1 changed files with 46 additions and 3 deletions
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49
backends/smv/smv.cc
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@ -40,6 +40,15 @@ struct SmvWorker
pool<shared_str> used_names;
vector<shared_str> strbuf;
struct assign_rhs_chunk {
string rhs_expr;
int offset, width;
bool operator<(const assign_rhs_chunk &other) const { return offset < other.offset; }
};
dict<Wire*, vector<assign_rhs_chunk>> partial_assignments;
vector<string> assignments;
const char *cid()
{
while (true) {
@ -129,13 +138,28 @@ struct SmvWorker
if (sig.is_wire())
return rvalue(sig);
log_error("Can not generate lvalue for signal %s. Try running 'splice'.\n", log_signal(sig));
const char *temp_id = cid();
f << stringf(" %s : unsigned word[%d];\n", temp_id, GetSize(sig));
int offset = 0;
for (auto &c : sig.chunks())
{
log_assert(c.wire != nullptr);
assign_rhs_chunk rhs;
rhs.rhs_expr = stringf("%s[%d:%d]", temp_id, offset+c.width-1, offset);
rhs.offset = c.offset;
rhs.width = c.width;
partial_assignments[c.wire].push_back(rhs);
offset += c.width;
}
return temp_id;
}
void run()
{
vector<string> assignments;
f << stringf("MODULE %s\n", cid(module->name));
f << stringf(" VAR\n");
@ -312,6 +336,25 @@ struct SmvWorker
assignments.push_back(stringf("%s.%s := %s;", cid(cell->name), cid(conn.first), rvalue(conn.second)));
}
for (auto &it : partial_assignments)
{
std::sort(it.second.begin(), it.second.end());
string expr;
int offset = 0;
for (auto rhs : it.second) {
if (!expr.empty())
expr += " :: ";
if (offset < rhs.offset)
expr += stringf(" 0ub%d_0 :: ", rhs.offset - offset);
expr += rhs.rhs_expr;
offset = rhs.offset + rhs.width;
}
if (offset < it.first->width)
expr += stringf(" :: 0ub%d_0", it.first->width - offset);
assignments.push_back(stringf("%s := %s;", cid(it.first->name), expr.c_str()));
}
f << stringf(" ASSIGN\n");
for (const string &line : assignments)
f << stringf(" %s\n", line.c_str());