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Fix handling of zero-length SVA consecutive repetition

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Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Clifford Wolf 2018-05-05 13:58:01 +02:00
parent e3575a86c5
commit 3e67497ec2
1 changed files with 47 additions and 27 deletions
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70
frontends/verific/verificsva.cc
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@ -50,11 +50,11 @@
// sequence ##[+] sequence
// sequence ##[N:M] sequence
// sequence ##[N:$] sequence
// sequence [*]
// sequence [+]
// sequence [*N]
// sequence [*N:M]
// sequence [*N:$]
// expression [*]
// expression [+]
// expression [*N]
// expression [*N:M]
// expression [*N:$]
// sequence or sequence
// sequence and sequence
// expression throughout sequence
@ -1138,7 +1138,7 @@ struct VerificSvaImporter
log_abort();
}
int parse_sequence(SvaFsm &fsm, int start_node, Net *net)
int parse_sequence(SvaFsm &fsm, int start_node, Net *net, int past_start_node = -1)
{
if (check_expression(net)) {
int node = fsm.createNode();
@ -1183,15 +1183,28 @@ struct VerificSvaImporter
bool sva_inf = !strcmp(sva_high_s, "$");
int node = parse_sequence(fsm, start_node, inst->GetInput1());
int past_node = -1;
Net *next_net = inst->GetInput2();
Instance *next_inst = net_to_ast_driver(next_net);
if (next_inst != nullptr && next_inst->Type() == PRIM_SVA_CONSECUTIVE_REPEAT && sva_low > 0) {
past_node = fsm.createNode();
log_dump(past_node);
}
for (int i = 0; i < sva_low; i++) {
int next_node = fsm.createNode();
fsm.createEdge(node, next_node);
if (past_node >= 0 && i == sva_low-1)
fsm.createLink(node, past_node);
node = next_node;
}
if (sva_inf)
{
if (past_node >= 0)
fsm.createLink(node, past_node);
fsm.createEdge(node, node);
}
else
@ -1201,11 +1214,13 @@ struct VerificSvaImporter
int next_node = fsm.createNode();
fsm.createEdge(node, next_node);
fsm.createLink(node, next_node);
if (past_node >= 0)
fsm.createLink(node, past_node);
node = next_node;
}
}
node = parse_sequence(fsm, node, inst->GetInput2());
node = parse_sequence(fsm, node, inst->GetInput2(), past_node);
return node;
}
@ -1220,46 +1235,51 @@ struct VerificSvaImporter
bool sva_inf = !strcmp(sva_high_s, "$");
Net *body_net = inst->GetInput();
int node = fsm.createNode(start_node);
for (int i = 0; i < sva_low; i++)
bool bypass = false;
if (sva_low == 0) {
if (past_start_node == -1)
parser_error("Possibly zero-length consecutive repeat must follow a delay of at least one cycle", inst);
bypass = true;
sva_low++;
}
int node = fsm.createNode(start_node);
int prev_node = node;
node = parse_sequence(fsm, node, body_net);
for (int i = 1; i < sva_low; i++)
{
int next_node = fsm.createNode();
if (i == 0)
fsm.createLink(node, next_node);
else
fsm.createEdge(node, next_node);
prev_node = node;
node = parse_sequence(fsm, next_node, body_net);
}
if (sva_inf)
{
int next_node = fsm.createNode();
fsm.createEdge(node, next_node);
next_node = parse_sequence(fsm, next_node, body_net);
fsm.createLink(next_node, node);
log_assert(prev_node >= 0);
fsm.createEdge(node, prev_node);
}
else
{
for (int i = sva_low; i < sva_high; i++)
{
int next_node = fsm.createNode();
if (i == 0)
fsm.createLink(node, next_node);
else
fsm.createEdge(node, next_node);
next_node = parse_sequence(fsm, next_node, body_net);
prev_node = node;
node = parse_sequence(fsm, next_node, body_net);
fsm.createLink(node, next_node);
node = next_node;
fsm.createLink(prev_node, node);
}
}
if (bypass)
fsm.createLink(past_start_node, node);
return node;
}