diff options
Diffstat (limited to 'src/alu_op_decode.v')
| -rw-r--r-- | src/alu_op_decode.v | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/alu_op_decode.v b/src/alu_op_decode.v index b9db664..5eefcd8 100644 --- a/src/alu_op_decode.v +++ b/src/alu_op_decode.v @@ -31,6 +31,7 @@ always @ (*) begin 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 @@ -43,29 +44,40 @@ always @ (*) begin 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'b0000011: begin // LB, LH, LW, LBU, LHU + alu_op <= ALU_OP_ADD; end 7'b1100111: begin // JALR + alu_op <= ALU_OP_ADD; end 7'b0100011: begin // SB, SH, SW + alu_op <= ALU_OP_ADD; end 7'b1100011: begin // BEQ, BNE, BLT, BGE, BLTU, BGEU if ((funct3 == 3'b000) | (funct3 == 3'b001)) alu_op <= ALU_OP_SUB; else if ((funct3 == 3'b100) | (funct3 == 3'b101)) alu_op <= ALU_OP_SLT; else if ((funct3 == 3'b110) | (funct3 == 3'b111)) alu_op <= ALU_OP_SLTU; + else alu_op <= ALU_OP_ADD; end 7'b0110111: begin // LUI + alu_op <= ALU_OP_ADD; end 7'b0010111: begin // AUIPC + alu_op <= ALU_OP_ADD; end 7'b1101111: begin // JAL + alu_op <= ALU_OP_ADD; end 7'b0001111: begin // FENCE, FENCE.I + alu_op <= ALU_OP_ADD; end 7'b1110011: begin // ECALL, EBREAK, CSRRW, CSRRS, CSRRC, CSRRWI, CSRRSI, CSRRCI + alu_op <= ALU_OP_ADD; end + default: alu_op <= ALU_OP_ADD; endcase end |