diff options
Diffstat (limited to 'src/alu_op_decode.v')
| -rw-r--r-- | src/alu_op_decode.v | 36 |
1 files changed, 19 insertions, 17 deletions
diff --git a/src/alu_op_decode.v b/src/alu_op_decode.v index 5eefcd8..4a812ab 100644 --- a/src/alu_op_decode.v +++ b/src/alu_op_decode.v @@ -1,8 +1,10 @@ module alu_op_decode ( input [6:0] opcode, - input alu_ctrl, input [2:0] funct3, input [6:0] funct7, + + input alu_ctrl, + output reg [3:0] alu_op ); @@ -23,27 +25,27 @@ always @ (*) begin else case (opcode) 7'b0110011: begin // ADD, SUB, SLL, SLT, SLTU, XOR, SRL, SRA, OR, AND case (funct3) - 3'b000: alu_op <= funct7[5] ? ALU_OP_SUB : ALU_OP_ADD; - 3'b001: alu_op <= ALU_OP_SLL; - 3'b010: alu_op <= ALU_OP_SLT; - 3'b011: alu_op <= ALU_OP_SLTU; - 3'b100: alu_op <= ALU_OP_XOR; - 3'b101: alu_op <= funct7[5] ? ALU_OP_SRA : ALU_OP_SRL; - 3'b110: alu_op <= ALU_OP_OR; - 3'b111: alu_op <= ALU_OP_AND; + 3'b000: alu_op <= funct7[5] ? ALU_OP_SUB : ALU_OP_ADD; + 3'b001: alu_op <= ALU_OP_SLL; + 3'b010: alu_op <= ALU_OP_SLT; + 3'b011: alu_op <= ALU_OP_SLTU; + 3'b100: alu_op <= ALU_OP_XOR; + 3'b101: alu_op <= funct7[5] ? ALU_OP_SRA : ALU_OP_SRL; + 3'b110: alu_op <= ALU_OP_OR; + 3'b111: alu_op <= ALU_OP_AND; default: alu_op <= ALU_OP_ADD; endcase end 7'b0010011: begin // ADDI, SLTI, SLTIU, XORI, ORI, ANDI, SLLI, SRLI, SRAI case (funct3) - 3'b000: alu_op <= ALU_OP_ADD; - 3'b001: alu_op <= ALU_OP_SLL; - 3'b010: alu_op <= ALU_OP_SLT; - 3'b011: alu_op <= ALU_OP_SLTU; - 3'b100: alu_op <= ALU_OP_XOR; - 3'b101: alu_op <= funct7[5] ? ALU_OP_SRA : ALU_OP_SRL; - 3'b110: alu_op <= ALU_OP_OR; - 3'b111: alu_op <= ALU_OP_AND; + 3'b000: alu_op <= ALU_OP_ADD; + 3'b001: alu_op <= ALU_OP_SLL; + 3'b010: alu_op <= ALU_OP_SLT; + 3'b011: alu_op <= ALU_OP_SLTU; + 3'b100: alu_op <= ALU_OP_XOR; + 3'b101: alu_op <= funct7[5] ? ALU_OP_SRA : ALU_OP_SRL; + 3'b110: alu_op <= ALU_OP_OR; + 3'b111: alu_op <= ALU_OP_AND; default: alu_op <= ALU_OP_ADD; endcase end |