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function opcode_jump;
input [31:0] opcode;
begin
opcode_jump = 0;
if (opcode[6:0] == 7'b1101111) opcode_jump = 1; // JAL
if (opcode[14:12] == 3'b000 && opcode[6:0] == 7'b1100111) opcode_jump = 1; // JALR
end
endfunction
function opcode_branch;
input [31:0] opcode;
begin
opcode_branch = 0;
if (opcode[14:12] == 3'b000 && opcode[6:0] == 7'b1100011) opcode_branch = 1; // BEQ
if (opcode[14:12] == 3'b001 && opcode[6:0] == 7'b1100011) opcode_branch = 1; // BNE
if (opcode[14:12] == 3'b100 && opcode[6:0] == 7'b1100011) opcode_branch = 1; // BLT
if (opcode[14:12] == 3'b101 && opcode[6:0] == 7'b1100011) opcode_branch = 1; // BGE
if (opcode[14:12] == 3'b110 && opcode[6:0] == 7'b1100011) opcode_branch = 1; // BLTU
if (opcode[14:12] == 3'b111 && opcode[6:0] == 7'b1100011) opcode_branch = 1; // BGEU
end
endfunction
function opcode_load;
input [31:0] opcode;
begin
opcode_load = 0;
if (opcode[14:12] == 3'b000 && opcode[6:0] == 7'b0000011) opcode_load = 1; // LB
if (opcode[14:12] == 3'b001 && opcode[6:0] == 7'b0000011) opcode_load = 1; // LH
if (opcode[14:12] == 3'b010 && opcode[6:0] == 7'b0000011) opcode_load = 1; // LW
if (opcode[14:12] == 3'b100 && opcode[6:0] == 7'b0000011) opcode_load = 1; // LBU
if (opcode[14:12] == 3'b101 && opcode[6:0] == 7'b0000011) opcode_load = 1; // LHU
end
endfunction
function opcode_store;
input [31:0] opcode;
begin
opcode_store = 0;
if (opcode[14:12] == 3'b000 && opcode[6:0] == 7'b0100011) opcode_store = 1; // SB
if (opcode[14:12] == 3'b001 && opcode[6:0] == 7'b0100011) opcode_store = 1; // SH
if (opcode[14:12] == 3'b010 && opcode[6:0] == 7'b0100011) opcode_store = 1; // SW
end
endfunction
function opcode_alui;
input [31:0] opcode;
begin
opcode_alui = 0;
if (opcode[14:12] == 3'b000 && opcode[6:0] == 7'b0010011) opcode_alui = 1; // ADDI
if (opcode[14:12] == 3'b010 && opcode[6:0] == 7'b0010011) opcode_alui = 1; // SLTI
if (opcode[14:12] == 3'b011 && opcode[6:0] == 7'b0010011) opcode_alui = 1; // SLTIU
if (opcode[14:12] == 3'b100 && opcode[6:0] == 7'b0010011) opcode_alui = 1; // XORI
if (opcode[14:12] == 3'b110 && opcode[6:0] == 7'b0010011) opcode_alui = 1; // ORI
if (opcode[14:12] == 3'b111 && opcode[6:0] == 7'b0010011) opcode_alui = 1; // ANDI
if (opcode[31:25] == 7'b0000000 && opcode[14:12] == 3'b001 && opcode[6:0] == 7'b0010011) opcode_alui = 1; // SLLI
if (opcode[31:25] == 7'b0000000 && opcode[14:12] == 3'b101 && opcode[6:0] == 7'b0010011) opcode_alui = 1; // SRLI
if (opcode[31:25] == 7'b0100000 && opcode[14:12] == 3'b101 && opcode[6:0] == 7'b0010011) opcode_alui = 1; // SRAI
end
endfunction
function opcode_alu;
input [31:0] opcode;
begin
opcode_alu = 0;
if (opcode[31:25] == 7'b0000000 && opcode[14:12] == 3'b000 && opcode[6:0] == 7'b0110011) opcode_alu = 1; // ADD
if (opcode[31:25] == 7'b0100000 && opcode[14:12] == 3'b000 && opcode[6:0] == 7'b0110011) opcode_alu = 1; // SUB
if (opcode[31:25] == 7'b0000000 && opcode[14:12] == 3'b001 && opcode[6:0] == 7'b0110011) opcode_alu = 1; // SLL
if (opcode[31:25] == 7'b0000000 && opcode[14:12] == 3'b010 && opcode[6:0] == 7'b0110011) opcode_alu = 1; // SLT
if (opcode[31:25] == 7'b0000000 && opcode[14:12] == 3'b011 && opcode[6:0] == 7'b0110011) opcode_alu = 1; // SLTU
if (opcode[31:25] == 7'b0000000 && opcode[14:12] == 3'b100 && opcode[6:0] == 7'b0110011) opcode_alu = 1; // XOR
if (opcode[31:25] == 7'b0000000 && opcode[14:12] == 3'b101 && opcode[6:0] == 7'b0110011) opcode_alu = 1; // SRL
if (opcode[31:25] == 7'b0100000 && opcode[14:12] == 3'b101 && opcode[6:0] == 7'b0110011) opcode_alu = 1; // SRA
if (opcode[31:25] == 7'b0000000 && opcode[14:12] == 3'b110 && opcode[6:0] == 7'b0110011) opcode_alu = 1; // OR
if (opcode[31:25] == 7'b0000000 && opcode[14:12] == 3'b111 && opcode[6:0] == 7'b0110011) opcode_alu = 1; // AND
end
endfunction
function opcode_sys;
input [31:0] opcode;
begin
opcode_sys = 0;
if (opcode[31:20] == 12'hC00 && opcode[19:12] == 3'b010 && opcode[6:0] == 7'b1110011) opcode_sys = 1; // RDCYCLE
if (opcode[31:20] == 12'hC01 && opcode[19:12] == 3'b010 && opcode[6:0] == 7'b1110011) opcode_sys = 1; // RDTIME
if (opcode[31:20] == 12'hC02 && opcode[19:12] == 3'b010 && opcode[6:0] == 7'b1110011) opcode_sys = 1; // RDINSTRET
if (opcode[31:20] == 12'hC80 && opcode[19:12] == 3'b010 && opcode[6:0] == 7'b1110011) opcode_sys = 1; // RDCYCLEH
if (opcode[31:20] == 12'hC81 && opcode[19:12] == 3'b010 && opcode[6:0] == 7'b1110011) opcode_sys = 1; // RDTIMEH
if (opcode[31:20] == 12'hC82 && opcode[19:12] == 3'b010 && opcode[6:0] == 7'b1110011) opcode_sys = 1; // RDINSTRETH
end
endfunction
function opcode_valid;
input [31:0] opcode;
begin
opcode_valid = 0;
if (opcode_jump (opcode)) opcode_valid = 1;
if (opcode_branch(opcode)) opcode_valid = 1;
if (opcode_load (opcode)) opcode_valid = 1;
if (opcode_store (opcode)) opcode_valid = 1;
if (opcode_alui (opcode)) opcode_valid = 1;
if (opcode_alu (opcode)) opcode_valid = 1;
if (opcode_sys (opcode)) opcode_valid = 1;
end
endfunction
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