fpga passes corax+

alu.sv

@@ -5,6 +5,7 @@ module alu(
     input wire clk_in,
     input alu_input in,
     output logic [7:0] result,
+    output logic [15:0] result_long,
     output logic overflow,
     output logic done
     );
@@ -39,6 +40,51 @@ module alu(
                     end
                     cnt <= cnt + 1;
                 end
+                structs::ADDL: begin
+                    result_long <= {8'h00, in.operand_a} + {4'h0, in.operand_b_long};
+                    done <= 1;
+                    cnt <= cnt + 1;
+                end
+                structs::SUB: begin
+                    result_int <= in.operand_a - in.operand_b;
+                    result <= result_int[7:0];
+                    // FIXME: if this fails, just do vx > vy
+                    overflow <= !result_int[8];
+                    if (cnt >= 2) begin
+                        done <= 1;
+                    end
+                    cnt <= cnt + 1;
+                end
+                structs::SE: begin
+                    result <= {7'b0000000, in.operand_a == in.operand_b}; 
+                    done <= 1;
+                end
+                structs::SNE: begin
+                    result <= {7'b0000000, in.operand_a != in.operand_b}; 
+                    done <= 1;
+                end
+                structs::OR: begin
+                    result <= in.operand_a | in.operand_b; 
+                    done <= 1;
+                end
+                structs::AND: begin
+                    result <= in.operand_a & in.operand_b; 
+                    done <= 1;
+                end
+                structs::XOR: begin
+                    result <= in.operand_a ^ in.operand_b; 
+                    done <= 1;
+                end
+                structs::SHR: begin
+                    result <= in.operand_a >> in.operand_b; 
+                    overflow <= in.operand_a[0];
+                    done <= 1;
+                end
+                structs::SHL: begin
+                    result <= in.operand_a << in.operand_b; 
+                    overflow <= in.operand_a[7];
+                    done <= 1;
+                end
             endcase
         end
     end