1 files changed, 30 insertions, 0 deletions
diff --git a/verilog/alu/v4/alu4.v b/verilog/alu/v4/alu4.v
new file mode 100644
index 0000000..a7b9892
--- /dev/null
+++ b/verilog/alu/v4/alu4.v
@@ -0,0 +1,30 @@
+`default_nettype none
+`timescale 1us/1ns
+
+`include "aluOp.vh"
+
+module alu4
+(
+input wire [31:0] alu_in_1,
+input wire[31:0] alu_in_2,
+input wire[3:0] alu_op_i,
+output wire[31:0] alu_output
+);
+
+
+wire [31:0] diff = alu_in_1 - alu_in_2;
+
+assign alu_output =
+	alu_op_i == `ADD ? alu_in_1 + alu_in_2 :
+	alu_op_i == `SUB ? diff :
+	alu_op_i == `XOR ? alu_in_1 ^ alu_in_2 :
+	alu_op_i == `OR ? alu_in_1 | alu_in_2 :
+	alu_op_i == `AND ? alu_in_1 & alu_in_2 :
+	alu_op_i == `SLL ? alu_in_1 << alu_in_2 :
+	alu_op_i == `SRL ? alu_in_1 >> alu_in_2 :
+	alu_op_i == `SLTU ? (alu_in_1 < alu_in_2 ? 32'b1 : 32'b0) :
+	alu_op_i == `NONE ? alu_in_1 :
+	alu_op_i == `SLT ? (alu_in_1[31] == alu_in_2[31] ? (diff[31] == 1'b0 ? 32'b0 : 32'b1) : (alu_in_1[31] == 1'b1 ? 32'b1 : 32'b0) ) :
+	alu_op_i == `SRA ? (alu_in_1 >> alu_in_2) | (alu_in_1[31] == 1'b0 ? 32'b0 : (32'hFFFFFFFF << {~alu_in_2[4], ~alu_in_2[3], ~alu_in_2[2], ~alu_in_2[1], ~alu_in_2[0]})) : 
+	32'b0;
+endmodule