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`include "core/isa.sv"
`include "core/uarch.sv"
module core_decode_data
(
input word insn,
output alu_op op,
output reg_num rn,
rd,
output logic writeback,
update_flags,
restore_spsr
);
assign rn = insn `FIELD_DATA_RN;
assign rd = insn `FIELD_DATA_RD;
assign op = insn `FIELD_DATA_OPCODE;
always_comb begin
unique case(op)
`ALU_CMP, `ALU_CMN, `ALU_TST, `ALU_TEQ:
writeback = 0;
default:
writeback = 1;
endcase
update_flags = insn `FIELD_DATA_S;
restore_spsr = (rd == `R15) & update_flags;
if(restore_spsr)
update_flags = 0;
end
endmodule
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