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kernel/mem: Add a Mem::narrow helper to split up wide ports.

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This commit is contained in:
Marcelina Kościelnicka 2021-05-25 00:58:17 +02:00
parent 8c1999aac1
commit 35ee774ea8
2 changed files with 53 additions and 0 deletions
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51
kernel/mem.cc
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@ -548,3 +548,54 @@ Cell *Mem::extract_rdff(int idx, FfInitVals *initvals) {
return c;
}
void Mem::narrow() {
std::vector<MemRd> new_rd_ports;
std::vector<MemWr> new_wr_ports;
std::vector<std::pair<int, int>> new_rd_map;
std::vector<std::pair<int, int>> new_wr_map;
for (int i = 0; i < GetSize(rd_ports); i++) {
auto &port = rd_ports[i];
for (int sub = 0; sub < (1 << port.wide_log2); sub++) {
new_rd_map.push_back(std::make_pair(i, sub));
}
}
for (int i = 0; i < GetSize(wr_ports); i++) {
auto &port = wr_ports[i];
for (int sub = 0; sub < (1 << port.wide_log2); sub++) {
new_wr_map.push_back(std::make_pair(i, sub));
}
}
for (auto &it : new_rd_map) {
MemRd &orig = rd_ports[it.first];
MemRd port = orig;
if (it.second != 0)
port.cell = nullptr;
if (port.wide_log2) {
port.data = port.data.extract(it.second * width, width);
for (int i = 0; i < port.wide_log2; i++)
port.addr[i] = State(it.second >> i & 1);
port.wide_log2 = 0;
}
new_rd_ports.push_back(port);
}
for (auto &it : new_wr_map) {
MemWr &orig = wr_ports[it.first];
MemWr port = orig;
if (it.second != 0)
port.cell = nullptr;
if (port.wide_log2) {
port.data = port.data.extract(it.second * width, width);
port.en = port.en.extract(it.second * width, width);
for (int i = 0; i < port.wide_log2; i++)
port.addr[i] = State(it.second >> i & 1);
port.wide_log2 = 0;
}
port.priority_mask.clear();
for (auto &it2 : new_wr_map)
port.priority_mask.push_back(orig.priority_mask[it2.first]);
new_wr_ports.push_back(port);
}
std::swap(rd_ports, new_rd_ports);
std::swap(wr_ports, new_wr_ports);
}

2
kernel/mem.h
View file

@ -75,6 +75,8 @@ struct Mem {
static std::vector<Mem> get_all_memories(Module *module);
static std::vector<Mem> get_selected_memories(Module *module);
Cell *extract_rdff(int idx, FfInitVals *initvals);
void narrow();
Mem(Module *module, IdString memid, int width, int start_offset, int size) : module(module), memid(memid), packed(false), mem(nullptr), cell(nullptr), width(width), start_offset(start_offset), size(size) {}
};