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Towards compressed ISA support

This commit is contained in:
Clifford Wolf 2015-11-19 14:01:33 +01:00
parent d8ffbf044a
commit f8eed23a68
1 changed files with 98 additions and 75 deletions
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picorv32.v
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@ -232,92 +232,103 @@ module picorv32 #(
always @(posedge clk) begin always @(posedge clk) begin
if (mem_valid && mem_ready) begin if (mem_valid && mem_ready) begin
mem_rdata_q <= COMPRESSED_ISA ? mem_rdata_latched : mem_rdata; mem_rdata_q <= COMPRESSED_ISA ? mem_rdata_latched : mem_rdata;
end
if (COMPRESSED_ISA && mem_do_rinst) begin if (COMPRESSED_ISA && mem_done && (mem_do_prefetch || mem_do_rinst)) begin
case (mem_rdata_latched[1:0]) case (mem_rdata_latched[1:0])
2'b00: begin // Quadrant 0 2'b00: begin // Quadrant 0
case (mem_rdata_latched[15:13]) case (mem_rdata_latched[15:13])
3'b000: begin // C.ADDI4SPN 3'b000: begin // C.ADDI4SPN
mem_rdata_q[14:12] <= 3'b000;
mem_rdata_q[31:20] <= {mem_rdata_latched[10:7], mem_rdata_latched[12:11], mem_rdata_latched[5], mem_rdata_latched[6]};
end
3'b 110: begin // C.SW
{mem_rdata_q[31:25], mem_rdata_q[11:7]} <= {mem_rdata_latched[5], mem_rdata_latched[12:10], mem_rdata_latched[6], 2'b00};
mem_rdata_q[14:12] <= 3'b 010;
end
endcase
end
2'b01: begin // Quadrant 1
case (mem_rdata_latched[15:13])
3'b 000: begin // C.ADDI
mem_rdata_q[14:12] <= 3'b000;
mem_rdata_q[31:20] <= $signed({mem_rdata_latched[12], mem_rdata_latched[6:2]});
end
3'b 010: begin // C.LI
mem_rdata_q[14:12] <= 3'b000;
mem_rdata_q[31:20] <= $signed({mem_rdata_latched[12], mem_rdata_latched[6:2]});
end
3'b 011: begin
if (mem_rdata_latched[11:7] == 2) begin // C.ADDI16SP
mem_rdata_q[14:12] <= 3'b000; mem_rdata_q[14:12] <= 3'b000;
mem_rdata_q[31:20] <= {mem_rdata_latched[10:7], mem_rdata_latched[12:11], mem_rdata_latched[5], mem_rdata_latched[6]}; mem_rdata_q[31:20] <= $signed({mem_rdata_latched[12], mem_rdata_latched[4:3],
mem_rdata_latched[5], mem_rdata_latched[2], mem_rdata_latched[6], 4'b 0000});
end else begin // C.LUI
mem_rdata_q[31:12] <= $signed({mem_rdata_latched[12], mem_rdata_latched[6:2]});
end end
3'b 110: begin // C.SW end
{mem_rdata_q[31:25], mem_rdata_q[11:7]} <= {mem_rdata_latched[5], mem_rdata_latched[12:10], mem_rdata_latched[6], 2'b00}; 3'b100: begin
mem_rdata_q[14:12] <= 3'b 010; if (mem_rdata_latched[11:10] == 2'b10) begin // C.ANDI
end mem_rdata_q[14:12] <= 3'b111;
endcase
end
2'b01: begin // Quadrant 1
case (mem_rdata_latched[15:13])
3'b 000: begin // C.ADDI
mem_rdata_q[14:12] <= 3'b000;
mem_rdata_q[31:20] <= $signed({mem_rdata_latched[12], mem_rdata_latched[6:2]}); mem_rdata_q[31:20] <= $signed({mem_rdata_latched[12], mem_rdata_latched[6:2]});
end end
3'b 010: begin // C.LI if (mem_rdata_latched[12:10] == 3'b011) begin // C.SUB, C.XOR, C.OR, C.AND
if (mem_rdata_latched[6:5] == 2'b00) mem_rdata_q[14:12] <= 3'b000;
if (mem_rdata_latched[6:5] == 2'b01) mem_rdata_q[14:12] <= 3'b100;
if (mem_rdata_latched[6:5] == 2'b10) mem_rdata_q[14:12] <= 3'b110;
if (mem_rdata_latched[6:5] == 2'b11) mem_rdata_q[14:12] <= 3'b111;
mem_rdata_q[31:25] <= mem_rdata_latched[6:5] == 2'b00 ? 7'b0100000 : 7'b0000000;
end
end
3'b 110: begin // C.BEQZ
mem_rdata_q[14:12] <= 3'b000;
{ mem_rdata_q[31], mem_rdata_q[7], mem_rdata_q[30:25], mem_rdata_q[11:8] } <=
$signed({mem_rdata_latched[12], mem_rdata_latched[6:5], mem_rdata_latched[2],
mem_rdata_latched[11:10], mem_rdata_latched[4:3]});
end
3'b 111: begin // C.BNEZ
mem_rdata_q[14:12] <= 3'b001;
{ mem_rdata_q[31], mem_rdata_q[7], mem_rdata_q[30:25], mem_rdata_q[11:8] } <=
$signed({mem_rdata_latched[12], mem_rdata_latched[6:5], mem_rdata_latched[2],
mem_rdata_latched[11:10], mem_rdata_latched[4:3]});
end
endcase
end
2'b10: begin // Quadrant 2
case (mem_rdata_latched[15:13])
3'b000: begin // C.SLLI
mem_rdata_q[31:25] <= 7'b0000000;
mem_rdata_q[14:12] <= 3'b 001;
end
3'b010: begin // C.LWSP
mem_rdata_q[31:20] <= {mem_rdata_latched[3:2], mem_rdata_latched[12], mem_rdata_latched[6:4], 2'b00};
mem_rdata_q[14:12] <= 3'b 010;
end
3'b100: begin
if (mem_rdata_latched[12] == 0 && mem_rdata_latched[6:2] == 0) begin // C.JR
mem_rdata_q[14:12] <= 3'b000; mem_rdata_q[14:12] <= 3'b000;
mem_rdata_q[31:20] <= $signed({mem_rdata_latched[12], mem_rdata_latched[6:2]}); mem_rdata_q[31:20] <= 12'b0;
end end
3'b 011: begin if (mem_rdata_latched[12] == 0 && mem_rdata_latched[6:2] != 0) begin // C.MV
if (mem_rdata_latched[11:7] == 2) begin // C.ADDI16SP
mem_rdata_q[14:12] <= 3'b000;
mem_rdata_q[31:20] <= $signed({mem_rdata_latched[12], mem_rdata_latched[4:3],
mem_rdata_latched[5], mem_rdata_latched[2], mem_rdata_latched[6], 4'b 0000});
end else begin // C.LUI
mem_rdata_q[31:12] <= $signed({mem_rdata_latched[12], mem_rdata_latched[6:2]});
end
end
3'b100: begin
if (mem_rdata_latched[11:10] == 2'b10) begin // C.ANDI
mem_rdata_q[14:12] <= 3'b111;
mem_rdata_q[31:20] <= $signed({mem_rdata_latched[12], mem_rdata_latched[6:2]});
end
end
3'b 110: begin // C.BEQZ
mem_rdata_q[14:12] <= 3'b000; mem_rdata_q[14:12] <= 3'b000;
{ mem_rdata_q[31], mem_rdata_q[7], mem_rdata_q[30:25], mem_rdata_q[11:8] } <= mem_rdata_q[31:25] <= 7'b0000000;
$signed({mem_rdata_latched[12], mem_rdata_latched[6:5], mem_rdata_latched[2],
mem_rdata_latched[11:10], mem_rdata_latched[4:3]});
end end
3'b 111: begin // C.BNEZ if (mem_rdata_latched[12] != 0 && mem_rdata_latched[11:7] != 0 && mem_rdata_latched[6:2] == 0) begin // C.JALR
mem_rdata_q[14:12] <= 3'b001; mem_rdata_q[14:12] <= 3'b000;
{ mem_rdata_q[31], mem_rdata_q[7], mem_rdata_q[30:25], mem_rdata_q[11:8] } <= mem_rdata_q[31:20] <= 12'b0;
$signed({mem_rdata_latched[12], mem_rdata_latched[6:5], mem_rdata_latched[2],
mem_rdata_latched[11:10], mem_rdata_latched[4:3]});
end end
endcase if (mem_rdata_latched[12] != 0 && mem_rdata_latched[6:2] != 0) begin // C.ADD
end mem_rdata_q[14:12] <= 3'b000;
2'b10: begin // Quadrant 2 mem_rdata_q[31:25] <= 7'b0000000;
case (mem_rdata_latched[15:13])
3'b010: begin // C.LWSP
mem_rdata_q[31:20] <= {mem_rdata_latched[3:2], mem_rdata_latched[12], mem_rdata_latched[6:4], 2'b00};
mem_rdata_q[14:12] <= 3'b 010;
end end
3'b100: begin end
if (mem_rdata_latched[12] == 0 && mem_rdata_latched[6:2] == 0) begin // C.JR 3'b110: begin // C.SWSP
mem_rdata_q[14:12] <= 3'b000; {mem_rdata_q[31:25], mem_rdata_q[11:7]} <= {mem_rdata_latched[8:7], mem_rdata_latched[12:9], 2'b00};
mem_rdata_q[31:20] <= 12'b0; mem_rdata_q[14:12] <= 3'b 010;
end end
if (mem_rdata_latched[12] == 0 && mem_rdata_latched[6:2] != 0) begin // C.MV endcase
mem_rdata_q[14:12] <= 3'b000; end
mem_rdata_q[31:25] <= 7'b0000000; endcase
end
if (mem_rdata_latched[12] != 0 && mem_rdata_latched[11:7] != 0 && mem_rdata_latched[6:2] == 0) begin // C.JALR
mem_rdata_q[14:12] <= 3'b000;
mem_rdata_q[31:20] <= 12'b0;
end
if (mem_rdata_latched[12] != 0 && mem_rdata_latched[6:2] != 0) begin // C.ADD
mem_rdata_q[14:12] <= 3'b000;
mem_rdata_q[31:25] <= 7'b0000000;
end
end
3'b110: begin // C.SWSP
{mem_rdata_q[31:25], mem_rdata_q[11:7]} <= {mem_rdata_latched[8:7], mem_rdata_latched[12:9], 2'b00};
mem_rdata_q[14:12] <= 3'b 010;
end
endcase
end
endcase
end
end end
end end
@ -584,6 +595,12 @@ module picorv32 #(
decoded_rd <= 8 + mem_rdata_latched[9:7]; decoded_rd <= 8 + mem_rdata_latched[9:7];
decoded_rs1 <= 8 + mem_rdata_latched[9:7]; decoded_rs1 <= 8 + mem_rdata_latched[9:7];
end end
if (mem_rdata_latched[12:10] == 3'b011) begin // C.SUB, C.XOR, C.OR, C.AND
is_alu_reg_reg <= 1;
decoded_rd <= 8 + mem_rdata_latched[9:7];
decoded_rs1 <= 8 + mem_rdata_latched[9:7];
decoded_rs2 <= 8 + mem_rdata_latched[4:2];
end
end end
3'b101: begin // C.J 3'b101: begin // C.J
instr_jal <= 1; instr_jal <= 1;
@ -602,6 +619,12 @@ module picorv32 #(
end end
2'b10: begin // Quadrant 2 2'b10: begin // Quadrant 2
case (mem_rdata_latched[15:13]) case (mem_rdata_latched[15:13])
3'b000: begin // C.SLLI
is_alu_reg_imm <= 1;
decoded_rd <= mem_rdata_latched[11:7];
decoded_rs1 <= mem_rdata_latched[11:7];
decoded_rs2 <= {mem_rdata_latched[12], mem_rdata_latched[6:2]};
end
3'b010: begin // C.LWSP 3'b010: begin // C.LWSP
is_lb_lh_lw_lbu_lhu <= 1; is_lb_lh_lw_lbu_lhu <= 1;
decoded_rd <= mem_rdata_latched[11:7]; decoded_rd <= mem_rdata_latched[11:7];