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Optimize alu_sub control flag

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Olof Kindgren 2019-01-14 08:52:06 +01:00
parent 45f6d408f8
commit 6f4c85f16d
1 changed files with 1 additions and 18 deletions
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19
rtl/serv_decode.v
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@ -67,18 +67,6 @@ module serv_decode
RUN = 2'd2,
TRAP = 2'd3;
localparam [4:0]
OP_LOAD = 5'b00000,
OP_STORE = 5'b01000,
OP_OPIMM = 5'b00100,
OP_AUIPC = 5'b00101,
OP_OP = 5'b01100,
OP_LUI = 5'b01101,
OP_BRANCH = 5'b11000,
OP_JALR = 5'b11001,
OP_JAL = 5'b11011,
OP_SYSTEM = 5'b11100;
reg [1:0] state;
reg [4:0] cnt;
@ -140,12 +128,7 @@ module serv_decode
assign o_alu_sub = alu_sub_r;
always @(posedge clk)
alu_sub_r <= (opcode == OP_OP) ? imm30 /* ? 1'b1*/ :
(branch_op & (o_funct3 == 3'b100)) ? 1'b1 :
(branch_op & (o_funct3 == 3'b101)) ? 1'b1 :
(branch_op & (o_funct3 == 3'b110)) ? 1'b1 :
1'b0;
alu_sub_r <= opcode[3] & imm30;
assign o_alu_cmp_neg = branch_op & o_funct3[0];
/*