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// Richard CPU
// Copyright (C) 2026 Richard Qin
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
// File path: rtl/core/branch_unit.sv
// Description: Branch Unit, responsible for determining whether conditional jump instructions are effective
module branch_unit
import rv64_pkg::*;
(
input logic is_branch, // Indicates whether the current instruction is a branch instruction
input logic [2:0] branch_op, // Specific branch types func3
input logic [XLEN-1:0] operand_a, // operand 1
input logic [XLEN-1:0] operand_b, // operand 2
output logic branch_taken // Branch taken signal
);
always_comb begin
branch_taken = 1'b0;
if (is_branch) begin
case (branch_op)
// 3'b000: BEQ (Branch if Equal)
BRANCH_EQ: branch_taken = (operand_a == operand_b);
// 3'b001: BNE (Branch if Not Equal)
BRANCH_NE: branch_taken = (operand_a != operand_b);
// 3'b100: BLT (Branch if Less Than, Signed)
BRANCH_LT: branch_taken = ($signed(operand_a) < $signed(operand_b));
// 3'b101: BGE (Branch if Greater Than or Equal, Signed)
BRANCH_GE: branch_taken = ($signed(operand_a) >= $signed(operand_b));
// 3'b110: BLTU (Branch if Less Than, Unsigned)
BRANCH_LTU: branch_taken = (operand_a < operand_b);
// 3'b111: BGEU (Branch if Greater Than or Equal, Unsigned)
BRANCH_GEU: branch_taken = (operand_a >= operand_b);
default: branch_taken = 1'b0;
endcase
end
end
endmodule
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