From 091bf4a18b2f4bf84fe62b61577c88d961468b3c Mon Sep 17 00:00:00 2001
From: Eddie Hung <eddie@fpgeh.com>
Date: Tue, 20 Aug 2019 18:16:37 -0700
Subject: Remove sequential extension

---
 frontends/aiger/aigerparse.cc | 35 ++---------------------------------
 1 file changed, 2 insertions(+), 33 deletions(-)

(limited to 'frontends/aiger')

diff --git a/frontends/aiger/aigerparse.cc b/frontends/aiger/aigerparse.cc
index 7a467b91e..e8ee487e5 100644
--- a/frontends/aiger/aigerparse.cc
+++ b/frontends/aiger/aigerparse.cc
@@ -732,19 +732,12 @@ void AigerReader::parse_aiger_binary()
 void AigerReader::post_process()
 {
 	pool<IdString> seen_boxes;
-	pool<IdString> flops;
-	unsigned ci_count = 0, co_count = 0, flop_count = 0;
+	unsigned ci_count = 0, co_count = 0;
 	for (auto cell : boxes) {
 		RTLIL::Module* box_module = design->module(cell->type);
 		log_assert(box_module);
 
-		bool is_flop = false;
 		if (seen_boxes.insert(cell->type).second) {
-			if (box_module->attributes.count("\\abc_flop")) {
-				log_assert(flop_count < flopNum);
-				flops.insert(cell->type);
-				is_flop = true;
-			}
 			auto it = box_module->attributes.find("\\abc_carry");
 			if (it != box_module->attributes.end()) {
 				RTLIL::Wire *carry_in = nullptr, *carry_out = nullptr;
@@ -784,8 +777,6 @@ void AigerReader::post_process()
 				carry_out->port_id = ports.size();
 			}
 		}
-		else
-			is_flop = flops.count(cell->type);
 
 		// NB: Assume box_module->ports are sorted alphabetically
 		//     (as RTLIL::Module::fixup_ports() would do)
@@ -812,25 +803,7 @@ void AigerReader::post_process()
 				rhs.append(wire);
 			}
 
-			if (!is_flop || port_name != "\\$pastQ")
-				cell->setPort(port_name, rhs);
-		}
-
-		if (is_flop) {
-			RTLIL::Wire *d = outputs[outputs.size() - flopNum + flop_count];
-			log_assert(d);
-			log_assert(d->port_output);
-			d->port_output = false;
-
-			RTLIL::Wire *q = inputs[piNum - flopNum + flop_count];
-			log_assert(q);
-			log_assert(q->port_input);
-			q->port_input = false;
-
-			flop_count++;
-			module->connect(q, d);
-			cell->set_bool_attribute("\\abc_flop");
-			continue;
+			cell->setPort(port_name, rhs);
 		}
 	}
 
@@ -934,10 +907,6 @@ void AigerReader::post_process()
 					}
 				}
 				log_debug(" -> %s\n", log_id(wire));
-				int init;
-				mf >> init;
-				if (init < 2)
-					wire->attributes["\\init"] = init;
 			}
 			else if (type == "box") {
 				RTLIL::Cell* cell = module->cell(stringf("$__box%d__", variable));
-- 
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