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Improve Verific SVA importer

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This commit is contained in:
Clifford Wolf 2017-07-27 10:39:39 +02:00
parent 649bb9374f
commit 147ff96ba3
1 changed files with 58 additions and 37 deletions
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95
frontends/verific/verific.cc
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@ -1140,9 +1140,6 @@ struct VerificSvaImporter
SigBit disable_iff = State::S0;
bool import_sva_disable_hiactive = true;
int import_sva_init_disable_steps = 0;
bool mode_assert = false;
bool mode_assume = false;
bool mode_cover = false;
@ -1173,18 +1170,65 @@ struct VerificSvaImporter
Instance *get_ast_input3(Instance *inst) { return net_to_ast_driver(inst->GetInput3()); }
Instance *get_ast_control(Instance *inst) { return net_to_ast_driver(inst->GetControl()); }
SigBit parse_sequence(Net *n)
struct sequence_t {
int length = 0;
SigBit sig_a = State::S1;
SigBit sig_en = State::S1;
};
void sequence_cond(sequence_t &seq, SigBit cond)
{
seq.sig_a = module->And(NEW_ID, seq.sig_a, cond);
}
void sequence_ff(sequence_t &seq)
{
if (disable_iff != State::S0)
seq.sig_en = module->Mux(NEW_ID, seq.sig_en, State::S0, disable_iff);
Wire *sig_a_q = module->addWire(NEW_ID);
sig_a_q->attributes["\\init"] = Const(0, 1);
Wire *sig_en_q = module->addWire(NEW_ID);
sig_en_q->attributes["\\init"] = Const(0, 1);
module->addDff(NEW_ID, clock, seq.sig_a, sig_a_q, clock_posedge);
module->addDff(NEW_ID, clock, seq.sig_en, sig_en_q, clock_posedge);
seq.length++;
seq.sig_a = sig_a_q;
seq.sig_en = sig_en_q;
}
void parse_sequence(sequence_t &seq, Net *n)
{
Instance *inst = net_to_ast_driver(n);
if (inst == nullptr)
return importer->net_map_at(n);
if (inst == nullptr) {
sequence_cond(seq, importer->net_map_at(n));
return;
}
if (inst->Type() == PRIM_SVA_OVERLAPPED_IMPLICATION)
{
parse_sequence(seq, inst->GetInput1());
seq.sig_en = module->And(NEW_ID, seq.sig_en, seq.sig_a);
parse_sequence(seq, inst->GetInput2());
return;
}
if (inst->Type() == PRIM_SVA_NON_OVERLAPPED_IMPLICATION)
{
parse_sequence(seq, inst->GetInput1());
seq.sig_en = module->And(NEW_ID, seq.sig_en, seq.sig_a);
sequence_ff(seq);
parse_sequence(seq, inst->GetInput2());
return;
}
if (!importer->mode_keep)
log_error("Unsupported Verific SVA primitive %s of type %s.\n", inst->Name(), inst->View()->Owner()->Name());
log_warning("Unsupported Verific SVA primitive %s of type %s.\n", inst->Name(), inst->View()->Owner()->Name());
return importer->net_map_at(n);
}
void run()
@ -1203,8 +1247,6 @@ struct VerificSvaImporter
clock = importer->net_map_at(clock_node->GetInput());
clock_posedge = (clock_node->Type() == PRIM_SVA_POSEDGE);
import_sva_init_disable_steps = 1;
// parse disable_iff expression
Net *sequence_net = at_node->GetInput2();
@ -1217,38 +1259,17 @@ struct VerificSvaImporter
// parse SVA sequence into trigger signal
SigBit sig_a_d = parse_sequence(sequence_net);
Wire *sig_a_q = module->addWire(NEW_ID);
sig_a_q->attributes["\\init"] = Const(import_sva_disable_hiactive ? State::S1 : State::S0, 1);
module->addDff(NEW_ID, clock, sig_a_d, sig_a_q, clock_posedge);
// generate properly delayed enable signal
SigBit sig_en = State::S1;
if (disable_iff != State::S0)
sig_en = module->Mux(NEW_ID, sig_en, State::S0, disable_iff);
for (int i = 0; i < import_sva_init_disable_steps; i++)
{
Wire *new_en = module->addWire(NEW_ID);
new_en->attributes["\\init"] = Const(0, 1);
module->addDff(NEW_ID, clock, sig_en, new_en, clock_posedge);
if (disable_iff != State::S0 && i+1 < import_sva_init_disable_steps)
sig_en = module->Mux(NEW_ID, new_en, State::S0, disable_iff);
else
sig_en = new_en;
}
sequence_t seq;
parse_sequence(seq, sequence_net);
sequence_ff(seq);
// generate assert/assume/cover cell
RTLIL::IdString root_name = module->uniquify(root->IsUserDeclared() ? RTLIL::escape_id(root->Name()) : NEW_ID);
if (mode_assert) module->addAssert(root_name, sig_a_q, sig_en);
if (mode_assume) module->addAssume(root_name, sig_a_q, sig_en);
if (mode_cover) module->addCover(root_name, sig_a_q, sig_en);
if (mode_assert) module->addAssert(root_name, seq.sig_a, seq.sig_en);
if (mode_assume) module->addAssume(root_name, seq.sig_a, seq.sig_en);
if (mode_cover) module->addCover(root_name, seq.sig_a, seq.sig_en);
}
};