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// arithmetic unit:
// Arithmetic part of the alu.
module arithmetic_unit (
input [31:0] a,
input [31:0] b,
input [1:0] op,
output reg [31:0] result
);
`include "include/consts.vh"
wire signed [31:0] a_signed, b_signed;
assign a_signed = a;
assign b_signed = b;
always @ (*) begin
case (op)
ARITHMETIC_OP_ADD: result = a + b; // ADD
ARITHMETIC_OP_SUB: result = a - b; // SUB
ARITHMETIC_OP_SLT: result = { {31{1'b0}}, a_signed < b_signed }; // SLT
ARITHMETIC_OP_SLTU: result = { {31{1'b0}}, a < b }; // SLTU
default: result = 32'b0;
endcase
end
endmodule
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