From a3d145d9b6bc1bffae2da18a214d72c41d206b1e Mon Sep 17 00:00:00 2001
From: Miodrag Milanovic <mmicko@gmail.com>
Date: Mon, 25 Mar 2024 09:23:31 +0100
Subject: [PATCH] set add_carry property and all inputs to 0

---
 techlibs/nanoxplore/nx_carry.cc | 37 ++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/techlibs/nanoxplore/nx_carry.cc b/techlibs/nanoxplore/nx_carry.cc
index 2a495e41e8a..a61921e05c6 100644
--- a/techlibs/nanoxplore/nx_carry.cc
+++ b/techlibs/nanoxplore/nx_carry.cc
@@ -83,6 +83,16 @@ static void nx_carry_chain(Module *module)
 		if (c.second.at(0)->getPort(ID(CI)).is_wire()) {
 			cell = module->addCell(NEW_ID, ID(NX_CY));
 			cell->setPort(ID(CI), State::S0);
+			// Set all inputs on 0
+			cell->setPort(ID(A1), State::S0);
+			cell->setPort(ID(B1), State::S0);
+			cell->setPort(ID(A2), State::S0);
+			cell->setPort(ID(B2), State::S0);
+			cell->setPort(ID(A3), State::S0);
+			cell->setPort(ID(B3), State::S0);
+			cell->setPort(ID(A4), State::S0);
+			cell->setPort(ID(B4), State::S0);
+
 			cell->setPort(names_A[0], c.second.at(0)->getPort(ID(CI)).as_bit());
 			cell->setPort(names_B[0], State::S0);
 			j++;
@@ -91,7 +101,25 @@ static void nx_carry_chain(Module *module)
 		for (size_t i=0 ; i<c.second.size(); i++) {
 			if (j==0) {
 				cell = module->addCell(NEW_ID, ID(NX_CY));
-				cell->setPort(ID(CI), c.second.at(i)->getPort(ID(CI)));
+				SigBit ci = c.second.at(i)->getPort(ID(CI)).as_bit();
+				cell->setPort(ID(CI), ci);
+				// Set all inputs on 0
+				cell->setPort(ID(A1), State::S0);
+				cell->setPort(ID(B1), State::S0);
+				cell->setPort(ID(A2), State::S0);
+				cell->setPort(ID(B2), State::S0);
+				cell->setPort(ID(A3), State::S0);
+				cell->setPort(ID(B3), State::S0);
+				cell->setPort(ID(A4), State::S0);
+				cell->setPort(ID(B4), State::S0);
+				if (ci.is_wire()) {
+					cell->setParam(ID(add_carry), Const(2,2));
+				} else {
+					if (ci == State::S0)
+						cell->setParam(ID(add_carry), Const(0,2));
+					else
+						cell->setParam(ID(add_carry), Const(1,2));
+				}
 			}
 			if (j==3) {
 				cell->set_string_attribute(ID(cnt), std::to_string(cnt));
@@ -104,6 +132,13 @@ static void nx_carry_chain(Module *module)
 					cell->setPort(ID(CI), State::S0);
 					cell->setPort(ID(A1), new_co);
 					cell->setPort(ID(B1), State::S0);
+					// Set all inputs on 0
+					cell->setPort(ID(A2), State::S0);
+					cell->setPort(ID(B2), State::S0);
+					cell->setPort(ID(A3), State::S0);
+					cell->setPort(ID(B3), State::S0);
+					cell->setPort(ID(A4), State::S0);
+					cell->setPort(ID(B4), State::S0);
 					j = 1;
 				} else {
 					if (c.second.at(i)->hasPort(ID(CO)))