riscv
/
yosys
mirror of https://github.com/YosysHQ/yosys.git
1
0
Fork 0
Code Issues Projects Releases Wiki Activity

Cope with $reduce_or common in case

This commit is contained in:
Eddie Hung 2019-06-21 12:31:14 -07:00
parent 32f637ffdb
commit 545cfbbe0d
1 changed files with 37 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

42
passes/opt/muxpack.cc
View File

@ -29,11 +29,13 @@ struct ExclusiveDatabase
Module *module; Module *module;
const SigMap &sigmap; const SigMap &sigmap;
dict<SigBit, std::pair<SigSpec,Const>> sig_cmp_prev; dict<SigBit, std::pair<SigSpec,std::vector<Const>>> sig_cmp_prev;
ExclusiveDatabase(Module *module, const SigMap &sigmap) : module(module), sigmap(sigmap) ExclusiveDatabase(Module *module, const SigMap &sigmap) : module(module), sigmap(sigmap)
{ {
SigSpec const_sig, nonconst_sig, y_port; SigSpec const_sig, nonconst_sig;
SigBit y_port;
pool<Cell*> reduce_or;
for (auto cell : module->cells()) { for (auto cell : module->cells()) {
if (cell->type == "$eq") { if (cell->type == "$eq") {
nonconst_sig = sigmap(cell->getPort("\\A")); nonconst_sig = sigmap(cell->getPort("\\A"));
@ -50,11 +52,40 @@ struct ExclusiveDatabase
const_sig = Const(RTLIL::S0, GetSize(nonconst_sig)); const_sig = Const(RTLIL::S0, GetSize(nonconst_sig));
y_port = sigmap(cell->getPort("\\Y")); y_port = sigmap(cell->getPort("\\Y"));
} }
else if (cell->type == "$reduce_or") {
reduce_or.insert(cell);
continue;
}
else continue; else continue;
log_assert(!nonconst_sig.empty()); log_assert(!nonconst_sig.empty());
log_assert(!const_sig.empty()); log_assert(!const_sig.empty());
sig_cmp_prev[y_port] = std::make_pair(nonconst_sig,const_sig.as_const()); sig_cmp_prev[y_port] = std::make_pair(nonconst_sig,std::vector<Const>{const_sig.as_const()});
}
for (auto cell : reduce_or) {
nonconst_sig = SigSpec();
std::vector<Const> values;
SigSpec a_port = sigmap(cell->getPort("\\A"));
for (auto bit : a_port) {
auto it = sig_cmp_prev.find(bit);
if (it == sig_cmp_prev.end()) {
nonconst_sig = SigSpec();
break;
}
if (nonconst_sig.empty())
nonconst_sig = it->second.first;
else if (nonconst_sig != it->second.first) {
nonconst_sig = SigSpec();
break;
}
for (auto value : it->second.second)
values.push_back(value);
}
if (nonconst_sig.empty())
continue;
y_port = sigmap(cell->getPort("\\Y"));
sig_cmp_prev[y_port] = std::make_pair(nonconst_sig,std::move(values));
} }
} }
@ -73,8 +104,9 @@ struct ExclusiveDatabase
else if (nonconst_sig != it->second.first) else if (nonconst_sig != it->second.first)
return false; return false;
if (!const_values.insert(it->second.second).second) for (auto value : it->second.second)
return false; if (!const_values.insert(value).second)
return false;
} }
return true; return true;