From 73526a6f103c927dd0d1504281659a87e7943688 Mon Sep 17 00:00:00 2001
From: Eddie Hung <eddie@fpgeh.com>
Date: Wed, 22 Jan 2020 14:21:25 -0800
Subject: [PATCH] read_aiger: also parse abc9_mergeability

---
 frontends/aiger/aigerparse.cc | 7 +++++--
 frontends/aiger/aigerparse.h  | 1 +
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/frontends/aiger/aigerparse.cc b/frontends/aiger/aigerparse.cc
index e7478c316..b9c648afd 100644
--- a/frontends/aiger/aigerparse.cc
+++ b/frontends/aiger/aigerparse.cc
@@ -442,11 +442,13 @@ void AigerReader::parse_xaiger()
 			}
 		}
 		else if (c == 'r') {
-			uint32_t dataSize YS_ATTRIBUTE(unused) = parse_xaiger_literal(f);
+			uint32_t dataSize = parse_xaiger_literal(f);
 			flopNum = parse_xaiger_literal(f);
 			log_debug("flopNum = %u\n", flopNum);
 			log_assert(dataSize == (flopNum+1) * sizeof(uint32_t));
-			f.ignore(flopNum * sizeof(uint32_t));
+			mergeability.reserve(flopNum);
+			for (unsigned i = 0; i < flopNum; i++)
+				mergeability.emplace_back(parse_xaiger_literal(f));
 		}
 		else if (c == 'n') {
 			parse_xaiger_literal(f);
@@ -774,6 +776,7 @@ void AigerReader::post_process()
 		auto ff = module->addCell(NEW_ID, "$__ABC9_FF_");
 		ff->setPort("\\D", d);
 		ff->setPort("\\Q", q);
+		ff->attributes["\\abc9_mergeability"] = mergeability[i];
 	}
 
 	dict<RTLIL::IdString, int> wideports_cache;
diff --git a/frontends/aiger/aigerparse.h b/frontends/aiger/aigerparse.h
index 722f1e472..46ac81212 100644
--- a/frontends/aiger/aigerparse.h
+++ b/frontends/aiger/aigerparse.h
@@ -45,6 +45,7 @@ struct AigerReader
     std::vector<RTLIL::Wire*> outputs;
     std::vector<RTLIL::Wire*> bad_properties;
     std::vector<RTLIL::Cell*> boxes;
+    std::vector<int> mergeability;
 
     AigerReader(RTLIL::Design *design, std::istream &f, RTLIL::IdString module_name, RTLIL::IdString clk_name, std::string map_filename, bool wideports);
     void parse_aiger();
-- 
2.30.2