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wreduce for $sub

This commit is contained in:
Eddie Hung 2019-07-19 12:50:21 -07:00
parent 4e9b1d36fa
commit fc0e36d1c0
1 changed files with 23 additions and 0 deletions
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23
passes/opt/wreduce.cc
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@ -365,6 +365,29 @@ struct WreduceWorker
}
}
if (cell->type.in("$add", "$sub")) {
SigSpec A = cell->getPort("\\A");
SigSpec B = cell->getPort("\\B");
bool sub = cell->type == "$sub";
int i;
for (i = 0; i < GetSize(sig); i++) {
if (B[i] != S0 && (sub || A[i] != S0))
break;
if (B[i] == S0)
module->connect(sig[i], A[i]);
else if (A[i] == S0)
module->connect(sig[i], B[i]);
else log_abort();
}
if (i > 0) {
cell->setPort("\\A", A.extract(i, -1));
cell->setPort("\\B", B.extract(i, -1));
sig.remove(0, i);
bits_removed += i;
}
}
if (GetSize(sig) == 0) {
log("Removed cell %s.%s (%s).\n", log_id(module), log_id(cell), log_id(cell->type));
module->remove(cell);