1 files changed, 72 insertions, 0 deletions
diff --git a/techlibs/gowin/determine_init.cc b/techlibs/gowin/determine_init.cc
new file mode 100644
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+++ b/techlibs/gowin/determine_init.cc
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+/*
+ *  yosys -- Yosys Open SYnthesis Suite
+ *
+ *  Copyright (C) 2018 Icenowy Zheng <icenowy@aosc.io>
+ *
+ *  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 DetermineInitPass : public Pass {
+	DetermineInitPass() : Pass("determine_init", "Determine the init value of cells") { }
+	void help() YS_OVERRIDE
+	{
+		log("\n");
+		log("    determine_init [selection]\n");
+		log("\n");
+		log("Determine the init value of cells that doesn't allow unknown init value.\n");
+		log("\n");
+	}
+
+	Const determine_init(Const init)
+	{
+		for (int i = 0; i < GetSize(init); i++) {
+			if (init[i] != State::S0 && init[i] != State::S1)
+				init[i] = State::S0;
+		}
+
+		return init;
+	}
+
+	void execute(std::vector<std::string> args, RTLIL::Design *design) YS_OVERRIDE
+	{
+		log_header(design, "Executing DETERMINE_INIT pass (determine init value for cells).\n");
+
+		extra_args(args, args.size(), design);
+
+		int cnt = 0;
+		for (auto module : design->selected_modules())
+		{
+			for (auto cell : module->selected_cells())
+			{
+				if (cell->type == "\\RAM16S4")
+				{
+					cell->setParam("\\INIT_0", determine_init(cell->getParam("\\INIT_0")));
+					cell->setParam("\\INIT_1", determine_init(cell->getParam("\\INIT_1")));
+					cell->setParam("\\INIT_2", determine_init(cell->getParam("\\INIT_2")));
+					cell->setParam("\\INIT_3", determine_init(cell->getParam("\\INIT_3")));
+					cnt++;
+				}
+			}
+		}
+		log_header(design, "Updated %d cells with determined init value.\n", cnt);
+	}
+} DetermineInitPass;
+
+PRIVATE_NAMESPACE_END