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Add "fmcombine -initeq -anyeq" 

Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Clifford Wolf 2019-05-11 09:28:55 +02:00
parent 04ef222cfb
commit b66b657b6b
1 changed files with 38 additions and 3 deletions
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41
passes/sat/fmcombine.cc
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@ -26,6 +26,8 @@ PRIVATE_NAMESPACE_BEGIN
struct opts_t
{
bool initeq = false;
bool anyeq = false;
bool fwd = false;
bool bwd = false;
bool nop = false;
@ -56,7 +58,7 @@ struct FmcombineWorker
return newsig;
}
void import_prim_cell(Cell *cell, const string &suffix)
Cell *import_prim_cell(Cell *cell, const string &suffix)
{
Cell *c = module->addCell(cell->name.str() + suffix, cell->type);
c->parameters = cell->parameters;
@ -64,6 +66,8 @@ struct FmcombineWorker
for (auto &conn : cell->connections())
c->setPort(conn.first, import_sig(conn.second, suffix));
return c;
}
void import_hier_cell(Cell *cell)
@ -102,8 +106,24 @@ struct FmcombineWorker
for (auto cell : original->cells()) {
if (design->module(cell->type) == nullptr) {
import_prim_cell(cell, "_gold");
import_prim_cell(cell, "_gate");
if (opts.anyeq && cell->type.in("$anyseq", "$anyconst")) {
Cell *gold = import_prim_cell(cell, "_gold");
for (auto &conn : cell->connections())
module->connect(import_sig(conn.second, "_gate"), gold->getPort(conn.first));
} else {
Cell *gold = import_prim_cell(cell, "_gold");
Cell *gate = import_prim_cell(cell, "_gate");
if (opts.initeq) {
if (cell->type.in("$ff", "$dff", "$dffe",
"$dffsr", "$adff", "$dlatch", "$dlatchsr")) {
SigSpec gold_q = gold->getPort("\\Q");
SigSpec gate_q = gate->getPort("\\Q");
SigSpec en = module->Initstate(NEW_ID);
SigSpec eq = module->Eq(NEW_ID, gold_q, gate_q);
module->addAssume(NEW_ID, eq, en);
}
}
}
} else {
import_hier_cell(cell);
}
@ -229,6 +249,13 @@ struct FmcombinePass : public Pass {
log("This is useful for formal test benches that check what differences in behavior\n");
log("a slight difference in input causes in a module.\n");
log("\n");
log(" -initeq\n");
log(" Insert assumptions that initially all FFs in both circuits have the\n");
log(" same initial values.\n");
log("\n");
log(" -anyeq\n");
log(" Do not duplicate $anyseq/$anyconst cells.\n");
log("\n");
log(" -fwd\n");
log(" Insert forward hint assumptions into the combined module.\n");
log("\n");
@ -261,6 +288,14 @@ struct FmcombinePass : public Pass {
// filename = args[++argidx];
// continue;
// }
if (args[argidx] == "-initeq") {
opts.initeq = true;
continue;
}
if (args[argidx] == "-anyeq") {
opts.anyeq = true;
continue;
}
if (args[argidx] == "-fwd") {
opts.fwd = true;
continue;