yosys/tests/csa_tree/csa_tree_sub_chains.ys

read_verilog <<EOT
module sub_3op(
	input [7:0] a, b, c,
	output [7:0] y
);
	assign y = a - b + c;
endmodule
EOT
hierarchy -auto-top
proc
csa_tree
select -assert-count 2 t:$fa
select -assert-count 1 t:$add
select -assert-count 1 t:$not
select -assert-none t:$sub
design -reset

read_verilog <<EOT
module sub_mixed(
	input [7:0] a, b, c, d,
	output [7:0] y
);
	assign y = a + b - c + d;
endmodule
EOT
hierarchy -auto-top
proc
csa_tree
select -assert-count 3 t:$fa
select -assert-count 1 t:$add
select -assert-count 1 t:$not
select -assert-none t:$sub
design -reset

read_verilog <<EOT
module sub_all(
	input [7:0] a, b, c, d,
	output [7:0] y
);
	assign y = a - b - c - d;
endmodule
EOT
hierarchy -auto-top
proc
csa_tree
select -assert-count 3 t:$fa
select -assert-count 1 t:$add
select -assert-count 3 t:$not
select -assert-none t:$sub
design -reset

read_verilog <<EOT
module sub_5op(
	input [11:0] a, b, c, d, e,
	output [11:0] y
);
	assign y = a - b + c - d + e;
endmodule
EOT
hierarchy -auto-top
proc
csa_tree
select -assert-count 4 t:$fa
select -assert-count 1 t:$add
select -assert-count 2 t:$not
select -assert-none t:$sub
design -reset

read_verilog <<EOT
module sub_signed(
	input signed [7:0] a, b, c, d,
	output signed [9:0] y
);
	assign y = a + b - c - d;
endmodule
EOT
hierarchy -auto-top
proc
csa_tree
select -assert-count 3 t:$fa
select -assert-count 1 t:$add
select -assert-count 2 t:$not
select -assert-none t:$sub
design -reset

read_verilog <<EOT
module sub_double_neg(
	input [7:0] a, b, c,
	output [7:0] y
);
	wire [7:0] ab = a - b;
	assign y = c - ab;
endmodule
EOT
hierarchy -auto-top
proc
csa_tree
select -assert-count 2 t:$fa
select -assert-count 1 t:$add
select -assert-count 1 t:$not
select -assert-none t:$sub
design -reset

read_verilog <<EOT
module alu_sub_3op(
	input [7:0] a, b, c,
	output [7:0] y
);
	assign y = a - b + c;
endmodule
EOT
hierarchy -auto-top
proc
alumacc
opt_clean
csa_tree
opt_clean
select -assert-count 2 t:$fa
select -assert-count 1 t:$add
select -assert-none t:$alu
select -assert-none t:$sub
design -reset

read_verilog <<EOT
module alu_sub_mixed(
	input [7:0] a, b, c, d,
	output [7:0] y
);
	assign y = a + b - c + d;
endmodule
EOT
hierarchy -auto-top
proc
alumacc
opt_clean
csa_tree
opt_clean
select -assert-count 3 t:$fa
select -assert-count 1 t:$add
select -assert-none t:$alu
select -assert-none t:$sub
design -reset

read_verilog <<EOT
module alu_sub_all(
	input [7:0] a, b, c, d,
	output [7:0] y
);
	assign y = a - b - c - d;
endmodule
EOT
hierarchy -auto-top
proc
alumacc
opt_clean
csa_tree
opt_clean
select -assert-count 3 t:$fa
select -assert-count 1 t:$add
select -assert-none t:$alu
select -assert-none t:$sub
design -reset

read_verilog <<EOT
module alu_sub_signed(
	input signed [7:0] a, b, c, d,
	output signed [9:0] y
);
	assign y = a + b - c - d;
endmodule
EOT
hierarchy -auto-top
proc
alumacc
opt_clean
csa_tree
opt_clean
select -assert-count 3 t:$fa
select -assert-count 1 t:$add
select -assert-none t:$alu
select -assert-none t:$sub
design -reset

read_verilog <<EOT
module macc_sub_mixed(
	input [7:0] a, b, c, d,
	output [7:0] y
);
	assign y = a + b - c + d;
endmodule
EOT
hierarchy -auto-top
proc
alumacc
opt
csa_tree
opt_clean
select -assert-none t:$macc t:$macc_v2 %u
select -assert-min 1 t:$fa
select -assert-count 1 t:$add
design -reset

read_verilog <<EOT
module macc_const(
	input [7:0] a, b, c,
	output [7:0] y
);
	assign y = a + b + c + 8'd42;
endmodule
EOT
hierarchy -auto-top
proc
alumacc
opt
csa_tree
opt_clean
select -assert-none t:$macc t:$macc_v2 %u
select -assert-min 1 t:$fa
select -assert-count 1 t:$add
design -reset

read_verilog <<EOT
module macc_two(
	input [7:0] a, b, c, d, e, f, g, h,
	output [7:0] y1, y2
);
	assign y1 = a + b + c + d;
	assign y2 = e + f + g + h;
endmodule
EOT
hierarchy -auto-top
proc
alumacc
opt
csa_tree
opt_clean
select -assert-none t:$macc t:$macc_v2 %u
select -assert-count 4 t:$fa
select -assert-count 2 t:$add
design -reset