From 598a475724b51954cb40c991dc3ed26cc11f81ec Mon Sep 17 00:00:00 2001
From: Clifford Wolf <clifford@clifford.at>
Date: Fri, 18 Sep 2015 21:57:34 +0200
Subject: Added nlutmap

---
 passes/techmap/nlutmap.cc | 173 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 173 insertions(+)
 create mode 100644 passes/techmap/nlutmap.cc

(limited to 'passes/techmap/nlutmap.cc')

diff --git a/passes/techmap/nlutmap.cc b/passes/techmap/nlutmap.cc
new file mode 100644
index 00000000..7ece4005
--- /dev/null
+++ b/passes/techmap/nlutmap.cc
@@ -0,0 +1,173 @@
+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2012  Clifford Wolf <clifford@clifford.at>
+ *
+ *  Permission to use, copy, modify, and/or distribute this software for any
+ *  purpose with or without fee is hereby granted, provided that the above
+ *  copyright notice and this permission notice appear in all copies.
+ *
+ *  THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ *  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ *  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ *  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ *  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ *  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ */
+
+#include "kernel/yosys.h"
+#include "kernel/sigtools.h"
+
+USING_YOSYS_NAMESPACE
+PRIVATE_NAMESPACE_BEGIN
+
+struct NlutmapConfig
+{
+	vector<int> luts;
+};
+
+struct NlutmapWorker
+{
+	const NlutmapConfig &config;
+	pool<Cell*> mapped_cells;
+	Module *module;
+
+	NlutmapWorker(const NlutmapConfig &config, Module *module) :
+			config(config), module(module)
+	{
+	}
+
+	RTLIL::Selection get_selection()
+	{
+		RTLIL::Selection sel(false);
+		for (auto cell : module->cells())
+			if (!mapped_cells.count(cell))
+				sel.select(module, cell);
+		return sel;
+	}
+
+	void run_abc(int lut_size)
+	{
+		Pass::call_on_selection(module->design, get_selection(), "lut2mux");
+
+		if (lut_size > 0)
+			Pass::call_on_selection(module->design, get_selection(), stringf("abc -lut 1:%d", lut_size));
+		else
+			Pass::call_on_selection(module->design, get_selection(), "abc");
+
+		Pass::call_on_module(module->design, module, "opt_clean");
+	}
+
+	void run()
+	{
+		vector<int> available_luts = config.luts;
+
+		while (!available_luts.empty())
+		{
+			int n_luts = available_luts.back();
+			int lut_size = GetSize(available_luts);
+			available_luts.pop_back();
+
+			if (n_luts == 0)
+				continue;
+
+			run_abc(lut_size);
+
+			SigMap sigmap(module);
+			dict<Cell*, int> candidate_ratings;
+			dict<SigBit, int> bit_lut_count;
+
+			for (auto cell : module->cells())
+			{
+				if (cell->type != "$lut" || mapped_cells.count(cell))
+					continue;
+
+				if (GetSize(cell->getPort("\\A")) == lut_size)
+					candidate_ratings[cell] = 0;
+
+				for (auto &conn : cell->connections())
+					for (auto bit : sigmap(conn.second))
+						bit_lut_count[bit]++;
+			}
+			
+			for (auto &cand : candidate_ratings)
+			{
+				for (auto &conn : cand.first->connections())
+					for (auto bit : sigmap(conn.second))
+						cand.second -= bit_lut_count[bit];
+			}
+
+			vector<pair<int, IdString>> rated_candidates;
+
+			for (auto &cand : candidate_ratings)
+				rated_candidates.push_back(pair<int, IdString>(cand.second, cand.first->name));
+
+			std::sort(rated_candidates.begin(), rated_candidates.end());
+
+			while (n_luts > 0 && !rated_candidates.empty()) {
+				mapped_cells.insert(module->cell(rated_candidates.back().second));
+				rated_candidates.pop_back();
+				n_luts--;
+			}
+
+			if (!available_luts.empty())
+				available_luts.back() += n_luts;
+		}
+
+		run_abc(0);
+	}
+};
+
+struct NlutmapPass : public Pass {
+	NlutmapPass() : Pass("nlutmap", "map to LUTs of different sizes") { }
+	virtual void help()
+	{
+		//   |---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|---v---|
+		log("\n");
+		log("    nlutmap [options] [selection]\n");
+		log("\n");
+		log("This pass uses successive calls to 'abc' to map to an architecture. That\n");
+		log("provides a small number of differently sized LUTs.\n");
+		log("\n");
+		log("    -luts N_1,N_2,N_3,...\n");
+		log("        The number of LUTs with 1, 2, 3, ... inputs that are\n");
+		log("        available in the target architecture.\n");
+		log("\n");
+		log("Excess logic that does not fit into the specified LUTs is mapped back\n");
+		log("to generic logic gates ($_AND_, etc.).\n");
+		log("\n");
+	}
+	virtual void execute(std::vector<std::string> args, RTLIL::Design *design)
+	{
+		NlutmapConfig config;
+
+		log_header("Executing NLUTMAP pass (mapping to constant drivers).\n");
+		log_push();
+
+		size_t argidx;
+		for (argidx = 1; argidx < args.size(); argidx++)
+		{
+			if (args[argidx] == "-luts" && argidx+1 < args.size()) {
+				vector<string> tokens = split_tokens(args[++argidx], ",");
+				config.luts.clear();
+				for (auto &token : tokens)
+					config.luts.push_back(atoi(token.c_str()));
+				continue;
+			}
+			break;
+		}
+		extra_args(args, argidx, design);
+
+		for (auto module : design->selected_whole_modules_warn())
+		{
+			NlutmapWorker worker(config, module);
+			worker.run();
+		}
+
+		log_pop();
+	}
+} NlutmapPass;
+
+PRIVATE_NAMESPACE_END
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