mirrors/yosys
3
0
Fork 0
mirror of https://github.com/YosysHQ/yosys synced 2025-10-30 19:22:31 +00:00
Code Activity

Added opt_rmdff support for $ff cells

Browse source
This commit is contained in:
Clifford Wolf 2016-10-14 13:02:36 +02:00
parent 53655d173b
commit 2ef454c3f5
1 changed files with 13 additions and 5 deletions
Download patch file Download diff file Expand all files Collapse all files

18
passes/opt/opt_rmdff.cc
View file

@ -72,7 +72,11 @@ bool handle_dff(RTLIL::Module *mod, RTLIL::Cell *dff)
RTLIL::SigSpec sig_d, sig_q, sig_c, sig_r;
RTLIL::Const val_cp, val_rp, val_rv;
if (dff->type == "$_DFF_N_" || dff->type == "$_DFF_P_") {
if (dff->type == "$_FF_") {
sig_d = dff->getPort("\\D");
sig_q = dff->getPort("\\Q");
}
else if (dff->type == "$_DFF_N_" || dff->type == "$_DFF_P_") {
sig_d = dff->getPort("\\D");
sig_q = dff->getPort("\\Q");
sig_c = dff->getPort("\\C");
@ -90,6 +94,10 @@ bool handle_dff(RTLIL::Module *mod, RTLIL::Cell *dff)
val_rp = RTLIL::Const(dff->type[7] == 'P', 1);
val_rv = RTLIL::Const(dff->type[8] == '1', 1);
}
else if (dff->type == "$ff") {
sig_d = dff->getPort("\\D");
sig_q = dff->getPort("\\Q");
}
else if (dff->type == "$dff") {
sig_d = dff->getPort("\\D");
sig_q = dff->getPort("\\Q");
@ -121,7 +129,7 @@ bool handle_dff(RTLIL::Module *mod, RTLIL::Cell *dff)
val_init.bits.push_back(bit.wire == NULL ? bit.data : RTLIL::State::Sx);
}
if (dff->type == "$dff" && mux_drivers.has(sig_d)) {
if (dff->type.in("$ff", "$dff") && mux_drivers.has(sig_d)) {
std::set<RTLIL::Cell*> muxes;
mux_drivers.find(sig_d, muxes);
for (auto mux : muxes) {
@ -138,7 +146,7 @@ bool handle_dff(RTLIL::Module *mod, RTLIL::Cell *dff)
}
}
if (sig_c.is_fully_const() && (!sig_r.size() || !has_init || val_init == val_rv)) {
if (!sig_c.empty() && sig_c.is_fully_const() && (!sig_r.size() || !has_init || val_init == val_rv)) {
if (val_rv.bits.size() == 0)
val_rv = val_init;
mod->connect(sig_q, val_rv);
@ -254,10 +262,10 @@ struct OptRmdffPass : public Pass {
if (!design->selected(module, cell))
continue;
if (cell->type.in("$_DFF_N_", "$_DFF_P_",
if (cell->type.in("$_FF_", "$_DFF_N_", "$_DFF_P_",
"$_DFF_NN0_", "$_DFF_NN1_", "$_DFF_NP0_", "$_DFF_NP1_",
"$_DFF_PN0_", "$_DFF_PN1_", "$_DFF_PP0_", "$_DFF_PP1_",
"$dff", "$adff"))
"$ff", "$dff", "$adff"))
dff_list.push_back(cell->name);
if (cell->type == "$dlatch")