diff --git a/techlibs/common/blackbox.sed b/techlibs/common/blackbox.sed
index 21693ecdd..db8900344 100644
--- a/techlibs/common/blackbox.sed
+++ b/techlibs/common/blackbox.sed
@@ -1,4 +1,5 @@
 #!/bin/sed -r
-/^(wire|assign|reg|event)/ d;
-/^(genvar|generate|always|initial)/,/^end/ d;
+/^(wire|assign|reg|event|integer|localparam|\/\/|[\/ ]\*| *$|`)/ d;
+/^(genvar|generate|always|initial|task|function)/,/^end/ d;
+/^endmodule/ s/$/\n/;
 s/ reg / /;
diff --git a/techlibs/common/simlib.v b/techlibs/common/simlib.v
index 1b67f3257..da745b5e0 100644
--- a/techlibs/common/simlib.v
+++ b/techlibs/common/simlib.v
@@ -795,87 +795,89 @@ endmodule
 // --------------------------------------------------------
 
 module \$macc (A, B, Y);
-	parameter A_WIDTH = 0;
-	parameter B_WIDTH = 0;
-	parameter Y_WIDTH = 0;
-	parameter CONFIG = 4'b0000;
-	parameter CONFIG_WIDTH = 4;
 
-	input [A_WIDTH-1:0] A;
-	input [B_WIDTH-1:0] B;
-	output reg [Y_WIDTH-1:0] Y;
+parameter A_WIDTH = 0;
+parameter B_WIDTH = 0;
+parameter Y_WIDTH = 0;
+parameter CONFIG = 4'b0000;
+parameter CONFIG_WIDTH = 4;
 
-	localparam integer num_bits = CONFIG[3:0];
-	localparam integer num_ports = (CONFIG_WIDTH-4) / (2 + 2*num_bits);
-	localparam integer num_abits = $clog2(A_WIDTH) > 0 ? $clog2(A_WIDTH) : 1;
+input [A_WIDTH-1:0] A;
+input [B_WIDTH-1:0] B;
+output reg [Y_WIDTH-1:0] Y;
 
-	function [2*num_ports*num_abits-1:0] get_port_offsets;
-		input [CONFIG_WIDTH-1:0] cfg;
-		integer i, cursor;
-		begin
-			cursor = 0;
-			get_port_offsets = 0;
-			for (i = 0; i < num_ports; i = i+1) begin
-				get_port_offsets[(2*i + 0)*num_abits +: num_abits] = cursor;
-				cursor = cursor + cfg[4 + i*(2 + 2*num_bits) + 2 +: num_bits];
-				get_port_offsets[(2*i + 1)*num_abits +: num_abits] = cursor;
-				cursor = cursor + cfg[4 + i*(2 + 2*num_bits) + 2 + num_bits +: num_bits];
-			end
-		end
-	endfunction
+localparam integer num_bits = CONFIG[3:0];
+localparam integer num_ports = (CONFIG_WIDTH-4) / (2 + 2*num_bits);
+localparam integer num_abits = $clog2(A_WIDTH) > 0 ? $clog2(A_WIDTH) : 1;
 
-	localparam [2*num_ports*num_abits-1:0] port_offsets = get_port_offsets(CONFIG);
-
-	`define PORT_IS_SIGNED   (0 + CONFIG[4 + i*(2 + 2*num_bits)])
-	`define PORT_DO_SUBTRACT (0 + CONFIG[4 + i*(2 + 2*num_bits) + 1])
-	`define PORT_SIZE_A      (0 + CONFIG[4 + i*(2 + 2*num_bits) + 2 +: num_bits])
-	`define PORT_SIZE_B      (0 + CONFIG[4 + i*(2 + 2*num_bits) + 2 + num_bits +: num_bits])
-	`define PORT_OFFSET_A    (0 + port_offsets[2*i*num_abits +: num_abits])
-	`define PORT_OFFSET_B    (0 + port_offsets[2*i*num_abits + num_abits +: num_abits])
-
-	integer i, j;
-	reg [Y_WIDTH-1:0] tmp_a, tmp_b;
-
-	always @* begin
-		Y = 0;
-		for (i = 0; i < num_ports; i = i+1)
-		begin
-			tmp_a = 0;
-			tmp_b = 0;
-
-			for (j = 0; j < `PORT_SIZE_A; j = j+1)
-				tmp_a[j] = A[`PORT_OFFSET_A + j];
-
-			if (`PORT_IS_SIGNED && `PORT_SIZE_A > 0)
-				for (j = `PORT_SIZE_A; j < Y_WIDTH; j = j+1)
-					tmp_a[j] = tmp_a[`PORT_SIZE_A-1];
-
-			for (j = 0; j < `PORT_SIZE_B; j = j+1)
-				tmp_b[j] = A[`PORT_OFFSET_B + j];
-
-			if (`PORT_IS_SIGNED && `PORT_SIZE_B > 0)
-				for (j = `PORT_SIZE_B; j < Y_WIDTH; j = j+1)
-					tmp_b[j] = tmp_b[`PORT_SIZE_B-1];
-
-			if (`PORT_SIZE_B > 0)
-				tmp_a = tmp_a * tmp_b;
-
-			if (`PORT_DO_SUBTRACT)
-				Y = Y - tmp_a;
-			else
-				Y = Y + tmp_a;
-		end
-		for (i = 0; i < B_WIDTH; i = i+1) begin
-			Y = Y + B[i];
+function [2*num_ports*num_abits-1:0] get_port_offsets;
+	input [CONFIG_WIDTH-1:0] cfg;
+	integer i, cursor;
+	begin
+		cursor = 0;
+		get_port_offsets = 0;
+		for (i = 0; i < num_ports; i = i+1) begin
+			get_port_offsets[(2*i + 0)*num_abits +: num_abits] = cursor;
+			cursor = cursor + cfg[4 + i*(2 + 2*num_bits) + 2 +: num_bits];
+			get_port_offsets[(2*i + 1)*num_abits +: num_abits] = cursor;
+			cursor = cursor + cfg[4 + i*(2 + 2*num_bits) + 2 + num_bits +: num_bits];
 		end
 	end
+endfunction
+
+localparam [2*num_ports*num_abits-1:0] port_offsets = get_port_offsets(CONFIG);
+
+`define PORT_IS_SIGNED   (0 + CONFIG[4 + i*(2 + 2*num_bits)])
+`define PORT_DO_SUBTRACT (0 + CONFIG[4 + i*(2 + 2*num_bits) + 1])
+`define PORT_SIZE_A      (0 + CONFIG[4 + i*(2 + 2*num_bits) + 2 +: num_bits])
+`define PORT_SIZE_B      (0 + CONFIG[4 + i*(2 + 2*num_bits) + 2 + num_bits +: num_bits])
+`define PORT_OFFSET_A    (0 + port_offsets[2*i*num_abits +: num_abits])
+`define PORT_OFFSET_B    (0 + port_offsets[2*i*num_abits + num_abits +: num_abits])
+
+integer i, j;
+reg [Y_WIDTH-1:0] tmp_a, tmp_b;
+
+always @* begin
+	Y = 0;
+	for (i = 0; i < num_ports; i = i+1)
+	begin
+		tmp_a = 0;
+		tmp_b = 0;
+
+		for (j = 0; j < `PORT_SIZE_A; j = j+1)
+			tmp_a[j] = A[`PORT_OFFSET_A + j];
+
+		if (`PORT_IS_SIGNED && `PORT_SIZE_A > 0)
+			for (j = `PORT_SIZE_A; j < Y_WIDTH; j = j+1)
+				tmp_a[j] = tmp_a[`PORT_SIZE_A-1];
+
+		for (j = 0; j < `PORT_SIZE_B; j = j+1)
+			tmp_b[j] = A[`PORT_OFFSET_B + j];
+
+		if (`PORT_IS_SIGNED && `PORT_SIZE_B > 0)
+			for (j = `PORT_SIZE_B; j < Y_WIDTH; j = j+1)
+				tmp_b[j] = tmp_b[`PORT_SIZE_B-1];
+
+		if (`PORT_SIZE_B > 0)
+			tmp_a = tmp_a * tmp_b;
+
+		if (`PORT_DO_SUBTRACT)
+			Y = Y - tmp_a;
+		else
+			Y = Y + tmp_a;
+	end
+	for (i = 0; i < B_WIDTH; i = i+1) begin
+		Y = Y + B[i];
+	end
+end
+
+`undef PORT_IS_SIGNED
+`undef PORT_DO_SUBTRACT
+`undef PORT_SIZE_A
+`undef PORT_SIZE_B
+`undef PORT_OFFSET_A
+`undef PORT_OFFSET_B
 
-	`undef PORT_IS_SIGNED
-	`undef PORT_DO_SUBTRACT
-	`undef PORT_SIZE_A
-	`undef PORT_SIZE_B
-	`undef PORT_OFFSET_A
-	`undef PORT_OFFSET_B
 endmodule
 
 // --------------------------------------------------------