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Merge pull request #4727 from georgerennie/george/bufnorm_constants2 

bufnorm: preserve constant bits when mapping back to connections
This commit is contained in:
Martin Povišer 2024-11-13 14:32:15 +01:00 committed by GitHub
parent 8d0bf3f35e ff6c9446c0
commit 9da7341003
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GPG Key ID: B5690EEEBB952194
1 changed files with 14 additions and 7 deletions
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21
passes/techmap/bufnorm.cc
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@ -404,6 +404,17 @@ struct BufnormPass : public Pass {
pool<Cell*> added_buffers;
const auto lookup_mapping = [&mapped_bits](const SigBit bit, bool default_sx = false)
{
if (!bit.is_wire())
return bit;
if (default_sx)
return mapped_bits.at(bit, State::Sx);
return mapped_bits.at(bit);
};
auto make_buffer_f = [&](const IdString &type, const SigSpec &src, const SigSpec &dst)
{
auto it = old_buffers.find(pair<IdString, SigSpec>(type, dst));
@ -438,12 +449,8 @@ struct BufnormPass : public Pass {
bool chain_this_wire = chain_this_wire_f(wire);
SigSpec keysig = sigmap(wire), insig = wire, outsig = wire;
for (int i = 0; i < GetSize(insig); i++) {
if (keysig[i].is_wire())
insig[i] = mapped_bits.at(keysig[i], State::Sx);
else
insig[i] = keysig[i];
}
for (int i = 0; i < GetSize(insig); i++)
insig[i] = lookup_mapping(keysig[i], true);
if (chain_this_wire) {
for (int i = 0; i < GetSize(outsig); i++)
@ -491,7 +498,7 @@ struct BufnormPass : public Pass {
SigSpec newsig = conn.second;
for (auto &bit : newsig)
bit = mapped_bits[sigmap(bit)];
bit = lookup_mapping(sigmap(bit));
if (conn.second != newsig) {
log(" fixing input signal on cell %s port %s: %s\n",