From 05c8858a907f0f188f1687ede260c2e1a97efe38 Mon Sep 17 00:00:00 2001
From: Eddie Hung <eddie@fpgeh.com>
Date: Wed, 15 Jan 2020 14:31:32 -0800
Subject: [PATCH 1/2] read_aiger: $lut prefix in front

---
 frontends/aiger/aigerparse.cc | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/frontends/aiger/aigerparse.cc b/frontends/aiger/aigerparse.cc
index f6b2a639d..a4b1e6fec 100644
--- a/frontends/aiger/aigerparse.cc
+++ b/frontends/aiger/aigerparse.cc
@@ -1001,9 +1001,9 @@ void AigerReader::post_process()
 		if (cell->type != "$lut") continue;
 		auto y_port = cell->getPort("\\Y").as_bit();
 		if (y_port.wire->width == 1)
-			module->rename(cell, stringf("%s$lut", y_port.wire->name.c_str()));
+			module->rename(cell, stringf("$lut%s", y_port.wire->name.c_str()));
 		else
-			module->rename(cell, stringf("%s[%d]$lut", y_port.wire->name.c_str(), y_port.offset));
+			module->rename(cell, stringf("$lut%s[%d]", y_port.wire->name.c_str(), y_port.offset));
 	}
 }
 

From 5918ede9bd7568d5a5156f20fdc4ce215d4968f8 Mon Sep 17 00:00:00 2001
From: Eddie Hung <eddie@fpgeh.com>
Date: Wed, 15 Jan 2020 14:36:05 -0800
Subject: [PATCH 2/2] abc9: aAdd test to check $_NOT_s are absorbed

---
 tests/techmap/abc9.ys | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/tests/techmap/abc9.ys b/tests/techmap/abc9.ys
index 20f263da8..62b5dfef6 100644
--- a/tests/techmap/abc9.ys
+++ b/tests/techmap/abc9.ys
@@ -38,3 +38,15 @@ abc9 -lut 4
 design -load gold
 scratchpad -copy abc9.script.flow3 abc9.script
 abc9 -lut 4
+
+
+design -reset
+read_verilog -icells <<EOT
+module top(input a, b, output o);
+assign o = ~(a & b);
+endmodule
+EOT
+abc9 -lut 4
+clean
+select -assert-count 1 t:$lut
+select -assert-none t:$lut t:* %D