mirrors/yosys
3
0
Fork 0
mirror of https://github.com/YosysHQ/yosys synced 2025-04-23 09:05:32 +00:00
Code Activity

Improvements in pmux2shiftx

Browse source 
Signed-off-by: Clifford Wolf <clifford@clifford.at>
This commit is contained in:
Clifford Wolf 2019-04-19 23:37:11 +02:00
parent 4c831d72ef
commit 0070184ea9
3 changed files with 36 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

19
passes/opt/pmux2shiftx.cc
View file

@ -149,6 +149,7 @@ struct Pmux2ShiftxPass : public Pass {
dict<SigSpec, pool<int>> seldb;
SigSpec B = cell->getPort("\\B");
SigSpec S = sigmap(cell->getPort("\\S"));
for (int i = 0; i < GetSize(S); i++)
{
@ -168,15 +169,6 @@ struct Pmux2ShiftxPass : public Pass {
SigSpec updated_S = cell->getPort("\\S");
SigSpec updated_B = cell->getPort("\\B");
#if 1
for (auto &it : seldb) {
string msg = stringf("seldb: %s ->", log_signal(it.first));
for (int i : it.second)
msg += stringf(" %d(%s)", i, log_signal(eqdb.at(S[i]).second));
log(" %s\n", msg.c_str());
}
#endif
while (!seldb.empty())
{
// pick the largest entry in seldb
@ -319,7 +311,8 @@ struct Pmux2ShiftxPass : public Pass {
min_choice = std::min(min_choice, new_c.as_int());
max_choice = std::max(max_choice, new_c.as_int());
log(" %s -> %s -> %s\n", log_signal(old_c), log_signal(new_c_before_xor), log_signal(new_c));
log(" %3d: %s -> %s -> %s: %s\n", it.second, log_signal(old_c), log_signal(new_c_before_xor),
log_signal(new_c), log_signal(B.extract(it.second*width, width)));
}
int range_density = 100*GetSize(choices) / (max_choice-min_choice+1);
@ -338,9 +331,9 @@ struct Pmux2ShiftxPass : public Pass {
Const offset(State::S0, GetSize(sig));
if (absolute_density < non_offset_percentage && range_density >= offset_percentage)
{
log(" using offset method.\n");
offset = Const(min_choice, GetSize(sig));
log(" offset: %s\n", log_signal(offset));
min_choice -= offset.as_int();
max_choice -= offset.as_int();
@ -377,7 +370,7 @@ struct Pmux2ShiftxPass : public Pass {
for (auto &it : perm_choices) {
int position = it.first.as_int()*extwidth;
int data_index = it.second;
data.replace(position, cell->getPort("\\B").extract(data_index*width, width));
data.replace(position, B.extract(data_index*width, width));
updated_S[data_index] = State::S0;
updated_B.replace(data_index*width, SigSpec(State::Sx, width));
}