diff options
| -rw-r--r-- | passes/memory/memory_map.cc | 44 |
1 files changed, 28 insertions, 16 deletions
diff --git a/passes/memory/memory_map.cc b/passes/memory/memory_map.cc index 878994679..eecb6f35d 100644 --- a/passes/memory/memory_map.cc +++ b/passes/memory/memory_map.cc @@ -28,6 +28,8 @@ struct MemoryMapWorker RTLIL::Design *design; RTLIL::Module *module; + std::map<std::pair<RTLIL::SigSpec, RTLIL::SigSpec>, RTLIL::SigBit> decoder_cache; + std::string genid(RTLIL::IdString name, std::string token1 = "", int i = -1, std::string token2 = "", int j = -1, std::string token3 = "", int k = -1, std::string token4 = "") { std::stringstream sstr; @@ -50,6 +52,27 @@ struct MemoryMapWorker return sstr.str(); } + RTLIL::Wire *addr_decode(RTLIL::SigSpec addr_sig, RTLIL::SigSpec addr_val) + { + std::pair<RTLIL::SigSpec, RTLIL::SigSpec> key(addr_sig, addr_val); + log_assert(SIZE(addr_sig) == SIZE(addr_val)); + + if (decoder_cache.count(key) == 0) { + if (SIZE(addr_sig) < 2) { + decoder_cache[key] = module->Eq(NEW_ID, addr_sig, addr_val); + } else { + int split_at = SIZE(addr_sig) / 2; + RTLIL::SigBit left_eq = addr_decode(addr_sig.extract(0, split_at), addr_val.extract(0, split_at)); + RTLIL::SigBit right_eq = addr_decode(addr_sig.extract(split_at, SIZE(addr_sig) - split_at), addr_val.extract(split_at, SIZE(addr_val) - split_at)); + decoder_cache[key] = module->And(NEW_ID, left_eq, right_eq); + } + } + + RTLIL::SigBit bit = decoder_cache.at(key); + log_assert(bit.wire != nullptr && SIZE(bit.wire) == 1); + return bit.wire; + } + void handle_cell(RTLIL::Cell *cell) { std::set<int> static_ports; @@ -230,19 +253,7 @@ struct MemoryMapWorker RTLIL::SigSpec wr_addr = cell->getPort("\\WR_ADDR").extract(j*mem_abits, mem_abits); RTLIL::SigSpec wr_data = cell->getPort("\\WR_DATA").extract(j*mem_width, mem_width); RTLIL::SigSpec wr_en = cell->getPort("\\WR_EN").extract(j*mem_width, mem_width); - - RTLIL::Cell *c = module->addCell(genid(cell->name, "$wreq", i, "", j), "$eq"); - c->parameters["\\A_SIGNED"] = RTLIL::Const(0); - c->parameters["\\B_SIGNED"] = RTLIL::Const(0); - c->parameters["\\A_WIDTH"] = cell->parameters["\\ABITS"]; - c->parameters["\\B_WIDTH"] = cell->parameters["\\ABITS"]; - c->parameters["\\Y_WIDTH"] = RTLIL::Const(1); - c->setPort("\\A", RTLIL::SigSpec(i, mem_abits)); - c->setPort("\\B", wr_addr); - count_wrmux++; - - RTLIL::Wire *w_seladdr = module->addWire(genid(cell->name, "$wreq", i, "", j, "$y")); - c->setPort("\\Y", w_seladdr); + RTLIL::Wire *w_seladdr = addr_decode(wr_addr, RTLIL::SigSpec(i, mem_abits)); int wr_offset = 0; while (wr_offset < wr_en.size()) @@ -261,7 +272,7 @@ struct MemoryMapWorker if (wr_bit != RTLIL::SigSpec(1, 1)) { - c = module->addCell(genid(cell->name, "$wren", i, "", j, "", wr_offset), "$and"); + RTLIL::Cell *c = module->addCell(genid(cell->name, "$wren", i, "", j, "", wr_offset), "$and"); c->parameters["\\A_SIGNED"] = RTLIL::Const(0); c->parameters["\\B_SIGNED"] = RTLIL::Const(0); c->parameters["\\A_WIDTH"] = RTLIL::Const(1); @@ -274,7 +285,7 @@ struct MemoryMapWorker c->setPort("\\Y", RTLIL::SigSpec(w)); } - c = module->addCell(genid(cell->name, "$wrmux", i, "", j, "", wr_offset), "$mux"); + RTLIL::Cell *c = module->addCell(genid(cell->name, "$wrmux", i, "", j, "", wr_offset), "$mux"); c->parameters["\\WIDTH"] = wr_width; c->setPort("\\A", sig.extract(wr_offset, wr_width)); c->setPort("\\B", wr_data.extract(wr_offset, wr_width)); @@ -285,13 +296,14 @@ struct MemoryMapWorker sig.replace(wr_offset, w); wr_offset += wr_width; + count_wrmux++; } } module->connect(RTLIL::SigSig(data_reg_in[i], sig)); } - log(" write interface: %d blocks of $eq, $and and $mux cells.\n", count_wrmux); + log(" write interface: %d write mux blocks.\n", count_wrmux); module->remove(cell); } |