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Merge pull request #1242 from jfng/fix-proc_prune-partial 

proc_prune: Promote partially redundant assignments.
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whitequark 2019-08-03 07:08:41 +00:00 committed by GitHub
parent 0917a5cf72 320bf2fde5
commit 44a9dcbbbf
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1 changed files with 11 additions and 2 deletions
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13
passes/proc/proc_prune.cc
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@ -82,14 +82,23 @@ struct PruneWorker
if (root) {
bool promotable = true;
for (auto &bit : lhs) {
if (bit.wire && affected[bit]) {
if (bit.wire && affected[bit] && !assigned[bit]) {
promotable = false;
break;
}
}
if (promotable) {
RTLIL::SigSpec rhs = sigmap(it->second);
RTLIL::SigSig conn;
for (int i = 0; i < GetSize(lhs); i++) {
RTLIL::SigBit lhs_bit = lhs[i];
if (lhs_bit.wire && !assigned[lhs_bit]) {
conn.first.append_bit(lhs_bit);
conn.second.append(rhs.extract(i));
}
}
promoted_count++;
module->connect(*it);
module->connect(conn);
remove.insert(*it);
}
}