yosys/tests/arch/xilinx/xilinx_dffopt.ys

read_verilog << EOT

// FDRE, mergeable CE and R.

module t0 (...);
input wire clk;
input wire [7:0] i;
output wire [7:0] o;

wire [7:0] tmp ;

LUT2 #(.INIT(4'h6)) lut0 (.I0(i[0]), .I1(i[1]), .O(tmp[0]));
LUT2 #(.INIT(4'h6)) lut1 (.I0(i[1]), .I1(i[2]), .O(tmp[1]));
LUT2 #(.INIT(4'h6)) lut2 (.I0(i[3]), .I1(i[4]), .O(tmp[2]));

FDRE ff (.D(tmp[0]), .CE(tmp[1]), .R(tmp[2]), .Q(o[0]));

endmodule

EOT
read_verilog -lib +/xilinx/cells_sim.v
design -save t0

equiv_opt -blacklist xilinx_dffopt_blacklist.txt -assert -map +/xilinx/cells_sim.v xilinx_dffopt
design -load postopt
clean

cd t0
select -assert-count 1 t:FDRE
select -assert-count 1 t:LUT6
select -assert-none t:FDRE t:LUT6 %% t:* %D

design -load t0

equiv_opt -blacklist xilinx_dffopt_blacklist.txt -assert -map +/xilinx/cells_sim.v xilinx_dffopt -lut4
design -load postopt
clean

cd t0
select -assert-count 1 t:FDRE
select -assert-count 1 t:LUT4
select -assert-count 1 t:LUT2
select -assert-none t:FDRE t:LUT4 t:LUT2 %% t:* %D

design -reset


read_verilog << EOT

// FDSE, mergeable CE and S, inversions.

module t0 (...);
input wire clk;
input wire [7:0] i;
output wire [7:0] o;

wire [7:0] tmp ;

LUT2 #(.INIT(4'h6)) lut0 (.I0(i[0]), .I1(i[1]), .O(tmp[0]));
LUT2 #(.INIT(4'h6)) lut1 (.I0(i[1]), .I1(i[2]), .O(tmp[1]));
LUT2 #(.INIT(4'h6)) lut2 (.I0(i[3]), .I1(i[4]), .O(tmp[2]));

FDSE #(.IS_D_INVERTED(1'b1), .IS_S_INVERTED(1'b1)) ff (.D(tmp[0]), .CE(tmp[1]), .S(tmp[2]), .Q(o[0]));

endmodule

EOT

read_verilog -lib +/xilinx/cells_sim.v
design -save t0

equiv_opt -blacklist xilinx_dffopt_blacklist.txt -assert -map +/xilinx/cells_sim.v xilinx_dffopt
design -load postopt
clean

cd t0
select -assert-count 1 t:FDSE
select -assert-count 1 t:LUT6
select -assert-none t:FDSE t:LUT6 %% t:* %D

design -load t0

equiv_opt -blacklist xilinx_dffopt_blacklist.txt -assert -map +/xilinx/cells_sim.v xilinx_dffopt -lut4
design -load postopt
clean

cd t0
select -assert-count 1 t:FDSE
select -assert-count 1 t:LUT4
select -assert-count 1 t:LUT2
select -assert-none t:FDSE t:LUT4 t:LUT2 %% t:* %D

design -reset


read_verilog << EOT

// FDCE, mergeable CE.

module t0 (...);
input wire clk;
input wire [7:0] i;
output wire [7:0] o;

wire [7:0] tmp ;

LUT2 #(.INIT(4'h6)) lut0 (.I0(i[0]), .I1(i[1]), .O(tmp[0]));
LUT2 #(.INIT(4'h6)) lut1 (.I0(i[1]), .I1(i[2]), .O(tmp[1]));
LUT2 #(.INIT(4'h6)) lut2 (.I0(i[3]), .I1(i[4]), .O(tmp[2]));

FDCE ff (.D(tmp[0]), .CE(tmp[1]), .CLR(tmp[2]), .Q(o[0]));

endmodule

EOT

read_verilog -lib +/xilinx/cells_sim.v
design -save t0

equiv_opt -async2sync -blacklist xilinx_dffopt_blacklist.txt -assert -map +/xilinx/cells_sim.v xilinx_dffopt
design -load postopt
clean

cd t0
select -assert-count 1 t:FDCE
select -assert-count 1 t:LUT4
select -assert-count 1 t:LUT2
select -assert-none t:FDCE t:LUT4 t:LUT2 %% t:* %D

design -reset


read_verilog << EOT

// FDSE, mergeable CE and S, but CE only not worth it.

module t0 (...);
input wire clk;
input wire [7:0] i;
output wire [7:0] o;

wire [7:0] tmp ;

LUT2 #(.INIT(4'h6)) lut0 (.I0(i[0]), .I1(i[1]), .O(tmp[0]));
LUT2 #(.INIT(4'h6)) lut1 (.I0(i[1]), .I1(i[2]), .O(tmp[1]));

FDSE ff (.D(tmp[0]), .CE(i[7]), .S(tmp[1]), .Q(o[0]));

endmodule

EOT

read_verilog -lib +/xilinx/cells_sim.v
design -save t0

equiv_opt -blacklist xilinx_dffopt_blacklist.txt -assert -map +/xilinx/cells_sim.v xilinx_dffopt
design -load postopt
clean

cd t0
select -assert-count 1 t:FDSE
select -assert-count 1 t:LUT5
select -assert-none t:FDSE t:LUT5 %% t:* %D

design -load t0

equiv_opt -blacklist xilinx_dffopt_blacklist.txt -assert -map +/xilinx/cells_sim.v xilinx_dffopt -lut4
design -load postopt
clean

cd t0
select -assert-count 1 t:FDSE
select -assert-count 2 t:LUT2
select -assert-none t:FDSE t:LUT2 %% t:* %D

design -reset


read_verilog << EOT

// FDRSE, mergeable CE, S, R.

module t0 (...);
input wire clk;
input wire [7:0] i;
output wire [7:0] o;

wire [7:0] tmp ;

LUT2 #(.INIT(4'h6)) lut0 (.I0(i[0]), .I1(i[1]), .O(tmp[0]));
LUT2 #(.INIT(4'h6)) lut1 (.I0(i[1]), .I1(i[2]), .O(tmp[1]));
LUT2 #(.INIT(4'h8)) lut2 (.I0(i[2]), .I1(i[0]), .O(tmp[2]));
LUT2 #(.INIT(4'h6)) lut3 (.I0(i[3]), .I1(i[4]), .O(tmp[3]));

FDRSE ff (.D(tmp[0]), .CE(tmp[1]), .S(tmp[2]), .R(tmp[3]), .Q(o[0]));

endmodule

EOT

read_verilog -lib +/xilinx/cells_sim.v
design -save t0

equiv_opt -blacklist xilinx_dffopt_blacklist.txt -assert -map +/xilinx/cells_sim.v xilinx_dffopt
design -load postopt
clean

cd t0
select -assert-count 1 t:FDRSE
select -assert-count 1 t:LUT6
select -assert-none t:FDRSE t:LUT6 %% t:* %D

design -load t0

equiv_opt -blacklist xilinx_dffopt_blacklist.txt -assert -map +/xilinx/cells_sim.v xilinx_dffopt -lut4
design -load postopt
clean

cd t0
select -assert-count 1 t:FDRSE
select -assert-count 1 t:LUT4
select -assert-count 1 t:LUT2
select -assert-none t:FDRSE t:LUT4 t:LUT2 %% t:* %D

design -reset