decode optimization and refactoring

This commit is contained in:
Blaise Tine 2021-02-27 18:21:41 -08:00
parent ebee332e9d
commit f5a17bd1a9
2 changed files with 356 additions and 351 deletions

View file

@ -18,20 +18,15 @@ module VX_decode #(
`UNUSED_VAR (clk)
`UNUSED_VAR (reset)
reg [`EX_BITS-1:0] ex_type;
reg [`OP_BITS-1:0] op_type;
reg [`MOD_BITS-1:0] op_mod;
reg [31:0] imm;
reg use_rd, use_rs1, use_rs2, use_rs3, use_PC, use_imm;
reg rd_fp, rs1_fp, rs2_fp;
reg is_join, is_wstall;
wire [31:0] instr = ifetch_rsp_if.instr;
reg [`ALU_BITS-1:0] alu_op;
reg [`BR_BITS-1:0] br_op;
reg [`MUL_BITS-1:0] mul_op;
reg [`LSU_BITS-1:0] lsu_op;
reg [`CSR_BITS-1:0] csr_op;
reg [`FPU_BITS-1:0] fpu_op;
reg [`GPU_BITS-1:0] gpu_op;
reg [19:0] upper_imm;
reg [31:0] jalx_offset;
reg [31:0] src2_imm;
wire [6:0] opcode = instr[6:0];
wire [2:0] func3 = instr[14:12];
wire [6:0] func7 = instr[31:25];
@ -42,360 +37,370 @@ module VX_decode #(
wire [4:0] rs2 = instr[24:20];
wire [4:0] rs3 = instr[31:27];
// opcode types
wire is_rtype = (opcode == `INST_R);
wire is_ltype = (opcode == `INST_L);
wire is_itype = (opcode == `INST_I);
wire is_stype = (opcode == `INST_S);
wire is_btype = (opcode == `INST_B);
wire is_jal = (opcode == `INST_JAL);
wire is_jalr = (opcode == `INST_JALR);
wire is_lui = (opcode == `INST_LUI);
wire is_auipc = (opcode == `INST_AUIPC);
wire is_jals = (opcode == `INST_SYS) && (func3 == 0);
wire is_csr = (opcode == `INST_SYS) && (func3 != 0);
wire is_gpu = (opcode == `INST_GPU);
// upper immediate
wire [19:0] upper_imm = {func7, rs2, rs1, func3};
wire [11:0] alu_imm = ((func3 == 3'h1) || (func3 == 3'h5)) ? {{7{1'b0}}, rs2} : u_12;
wire [20:0] jal_imm = {instr[31], instr[19:12], instr[20], instr[30:21], 1'b0};
wire [11:0] jalr_imm = {func7, rs2};
always @(*) begin
case (opcode)
`INST_LUI: upper_imm = {func7, rs2, rs1, func3};
`INST_AUIPC: upper_imm = {func7, rs2, rs1, func3};
default: upper_imm = 20'h0;
endcase
end
// I-type immediate
ex_type = `EX_NOP;
op_type = 'x;
op_mod = 'x;
imm = 'x;
use_rd = 0;
use_rs1 = 0;
use_rs2 = 0;
use_rs3 = 0;
use_PC = 0;
use_imm = 0;
rd_fp = 0;
rs1_fp = 0;
rs2_fp = 0;
is_join = 0;
is_wstall = 0;
wire alu_shift_i = (func3 == 3'h1) || (func3 == 3'h5);
wire [11:0] alu_shift_imm = {{7{1'b0}}, rs2};
wire [11:0] alu_imm = alu_shift_i ? alu_shift_imm : u_12;
always @(*) begin
case (opcode)
`INST_I: src2_imm = {{20{alu_imm[11]}}, alu_imm};
`INST_S,
`INST_FS: src2_imm = {{20{func7[6]}}, func7, rd};
`INST_L,
`INST_FL: src2_imm = {{20{u_12[11]}}, u_12};
`INST_B: src2_imm = {{20{instr[31]}}, instr[7], instr[30:25], instr[11:8], 1'b0};
default: src2_imm = 'x;
endcase
end
// JAL
wire [20:0] jal_imm = {instr[31], instr[19:12], instr[20], instr[30:21], 1'b0};
wire [31:0] jal_offset = {{11{jal_imm[20]}}, jal_imm};
wire [11:0] jalr_imm = {func7, rs2};
wire [31:0] jalr_offset = {{20{jalr_imm[11]}}, jalr_imm};
always @(*) begin
case (opcode)
`INST_JAL: jalx_offset = jal_offset;
`INST_JALR: jalx_offset = jalr_offset;
default: jalx_offset = 32'd4;
endcase
end
// BRANCH
wire is_br = (is_btype || is_jal || is_jalr || is_jals);
always @(*) begin
br_op = `BR_OTHER;
case (opcode)
`INST_B: begin
case (opcode)
`INST_I: begin
ex_type = `EX_ALU;
case (func3)
3'h0: br_op = `BR_EQ;
3'h1: br_op = `BR_NE;
3'h4: br_op = `BR_LT;
3'h5: br_op = `BR_GE;
3'h6: br_op = `BR_LTU;
3'h7: br_op = `BR_GEU;
default:;
3'h0: op_type = `OP_BITS'(`ALU_ADD);
3'h1: op_type = `OP_BITS'(`ALU_SLL);
3'h2: op_type = `OP_BITS'(`ALU_SLT);
3'h3: op_type = `OP_BITS'(`ALU_SLTU);
3'h4: op_type = `OP_BITS'(`ALU_XOR);
3'h5: op_type = (func7[5]) ? `OP_BITS'(`ALU_SRA) : `OP_BITS'(`ALU_SRL);
3'h6: op_type = `OP_BITS'(`ALU_OR);
3'h7: op_type = `OP_BITS'(`ALU_AND);
default:;
endcase
op_mod = 0;
imm = {{20{alu_imm[11]}}, alu_imm};
use_rd = 1;
use_rs1 = 1;
use_imm = 1;
end
`INST_R: begin
ex_type = `EX_ALU;
`ifdef EXT_F_ENABLE
if (func7[0]) begin
case (func3)
3'h0: op_type = `OP_BITS'(`MUL_MUL);
3'h1: op_type = `OP_BITS'(`MUL_MULH);
3'h2: op_type = `OP_BITS'(`MUL_MULHSU);
3'h3: op_type = `OP_BITS'(`MUL_MULHU);
3'h4: op_type = `OP_BITS'(`MUL_DIV);
3'h5: op_type = `OP_BITS'(`MUL_DIVU);
3'h6: op_type = `OP_BITS'(`MUL_REM);
3'h7: op_type = `OP_BITS'(`MUL_REMU);
default:;
endcase
op_mod = 2;
end else
`endif
begin
case (func3)
3'h0: op_type = (func7[5]) ? `OP_BITS'(`ALU_SUB) : `OP_BITS'(`ALU_ADD);
3'h1: op_type = `OP_BITS'(`ALU_SLL);
3'h2: op_type = `OP_BITS'(`ALU_SLT);
3'h3: op_type = `OP_BITS'(`ALU_SLTU);
3'h4: op_type = `OP_BITS'(`ALU_XOR);
3'h5: op_type = (func7[5]) ? `OP_BITS'(`ALU_SRA) : `OP_BITS'(`ALU_SRL);
3'h6: op_type = `OP_BITS'(`ALU_OR);
3'h7: op_type = `OP_BITS'(`ALU_AND);
default:;
endcase
op_mod = 0;
end
use_rd = 1;
use_rs1 = 1;
use_rs2 = 1;
end
`INST_LUI: begin
ex_type = `EX_ALU;
op_type = `OP_BITS'(`ALU_LUI);
op_mod = 0;
imm = {upper_imm, 12'(0)};
use_rd = 1;
use_rs1 = 1;
use_imm = 1;
end
`INST_AUIPC: begin
ex_type = `EX_ALU;
op_type = `OP_BITS'(`ALU_AUIPC);
op_mod = 0;
imm = {upper_imm, 12'(0)};
use_rd = 1;
use_PC = 1;
use_imm = 1;
end
`INST_JAL: begin
ex_type = `EX_ALU;
op_type = `OP_BITS'(`BR_JAL);
op_mod = 1;
imm = {{11{jal_imm[20]}}, jal_imm};
use_rd = 1;
use_PC = 1;
use_imm = 1;
is_wstall = 1;
end
`INST_JALR: begin
ex_type = `EX_ALU;
op_type = `OP_BITS'(`BR_JALR);
op_mod = 1;
imm = {{20{jalr_imm[11]}}, jalr_imm};
use_rd = 1;
use_rs1 = 1;
use_imm = 1;
is_wstall = 1;
end
`INST_B: begin
ex_type = `EX_ALU;
case (func3)
3'h0: op_type = `OP_BITS'(`BR_EQ);
3'h1: op_type = `OP_BITS'(`BR_NE);
3'h4: op_type = `OP_BITS'(`BR_LT);
3'h5: op_type = `OP_BITS'(`BR_GE);
3'h6: op_type = `OP_BITS'(`BR_LTU);
3'h7: op_type = `OP_BITS'(`BR_GEU);
default:;
endcase
op_mod = 1;
imm = {{20{instr[31]}}, instr[7], instr[30:25], instr[11:8], 1'b0};
use_rs1 = 1;
use_rs2 = 1;
use_PC = 1;
use_imm = 1;
is_wstall = 1;
end
`INST_SYS : begin
if (func3 == 0) begin
ex_type = `EX_ALU;
case (u_12)
12'h000: op_type = `OP_BITS'(`BR_ECALL);
12'h001: op_type = `OP_BITS'(`BR_EBREAK);
12'h302: op_type = `OP_BITS'(`BR_MRET);
12'h102: op_type = `OP_BITS'(`BR_SRET);
12'h7B2: op_type = `OP_BITS'(`BR_DRET);
default:;
endcase
op_mod = 1;
imm = 32'd4;
use_rd = 1;
use_PC = 1;
use_imm = 1;
end else begin
ex_type = `EX_CSR;
case (func3[1:0])
2'h0: op_type = `OP_BITS'(`CSR_RW);
2'h1: op_type = `OP_BITS'(`CSR_RW);
2'h2: op_type = `OP_BITS'(`CSR_RS);
2'h3: op_type = `OP_BITS'(`CSR_RC);
default:;
endcase
imm = 32'(u_12);
use_rd = 1;
use_rs1 = !func3[2];
use_imm = func3[2];
end
end
`ifdef EXT_F_ENABLE
`INST_FL,
`endif
`INST_L: begin
ex_type = `EX_LSU;
op_type = `OP_BITS'(func3);
imm = {{20{u_12[11]}}, u_12};
use_rd = 1;
use_rs1 = 1;
`ifdef EXT_F_ENABLE
rd_fp = (opcode == `INST_FL);
`endif
end
`ifdef EXT_F_ENABLE
`INST_FS,
`endif
`INST_S: begin
ex_type = `EX_LSU;
op_type = `OP_BITS'(func3);
imm = {{20{func7[6]}}, func7, rd};
use_rs1 = 1;
use_rs2 = 1;
`ifdef EXT_F_ENABLE
rs2_fp = (opcode == `INST_FS);
`endif
end
`ifdef EXT_F_ENABLE
`INST_FMADD,
`INST_FMSUB,
`INST_FNMSUB,
`INST_FNMADD: begin
ex_type = `EX_FPU;
op_type = `OP_BITS'(opcode[3:0]);
op_mod = func3;
use_rd = 1;
use_rs1 = 1;
use_rs2 = 1;
use_rs3 = 1;
rd_fp = 1;
rs1_fp = 1;
rs2_fp = 1;
end
`INST_FCI: begin
ex_type = `EX_FPU;
op_mod = func3;
use_rd = 1;
case (func7)
7'h00, // FADD
7'h04, // FSUB
7'h08, // FMUL
7'h0C: // FDIV
begin
op_type = `OP_BITS'(func7[3:0]);
use_rd = 1;
use_rs1 = 1;
use_rs2 = 1;
rd_fp = 1;
rs1_fp = 1;
rs2_fp = 1;
end
7'h2C: begin
op_type = `OP_BITS'(`FPU_SQRT);
use_rs1 = 1;
rd_fp = 1;
rs1_fp = 1;
end
7'h50: begin
op_type = `OP_BITS'(`FPU_CMP);
use_rs1 = 1;
use_rs2 = 1;
rs1_fp = 1;
rs2_fp = 1;
end
7'h60: begin
op_type = (instr[20]) ? `OP_BITS'(`FPU_CVTWUS) : `OP_BITS'(`FPU_CVTWS);
use_rs1 = 1;
rs1_fp = 1;
end
7'h68: begin
op_type = (instr[20]) ? `OP_BITS'(`FPU_CVTSWU) : `OP_BITS'(`FPU_CVTSW);
use_rs1 = 1;
rd_fp = 1;
end
7'h10: begin
// FSGNJ=0, FSGNJN=1, FSGNJX=2
op_type = `OP_BITS'(`FPU_MISC);
op_mod = {1'b0, func3[1:0]};
end
7'h14: begin
// FMIN=3, FMAX=4
op_type = `OP_BITS'(`FPU_MISC);
op_mod = func3[0] ? 4 : 3;
use_rs1 = 1;
use_rs2 = 1;
rs1_fp = 1;
rs2_fp = 1;
end
7'h70: begin
if (func3[0]) begin
// FCLASS
op_type = `OP_BITS'(`FPU_CLASS);
end else begin
// FMV.X.W=5
op_type = `OP_BITS'(`FPU_MISC);
op_mod = 5;
end
use_rs1 = 1;
rs1_fp = 1;
end
7'h78: begin
// FMV.W.X=6
op_type = `OP_BITS'(`FPU_MISC);
op_mod = 6;
rd_fp = 1;
end
default:;
endcase
end
`INST_JAL: br_op = `BR_JAL;
`INST_JALR: br_op = `BR_JALR;
`INST_SYS: begin
if (is_jals && u_12 == 12'h000) br_op = `BR_ECALL;
if (is_jals && u_12 == 12'h001) br_op = `BR_EBREAK;
if (is_jals && u_12 == 12'h302) br_op = `BR_MRET;
if (is_jals && u_12 == 12'h102) br_op = `BR_SRET;
if (is_jals && u_12 == 12'h7B2) br_op = `BR_DRET;
end
default:;
endcase
end
// ALU
always @(*) begin
alu_op = `ALU_OTHER;
if (is_lui) begin
alu_op = `ALU_LUI;
end else if (is_auipc) begin
alu_op = `ALU_AUIPC;
end else if (is_itype || is_rtype) begin
case (func3)
3'h0: alu_op = (is_rtype && func7 == 7'h20) ? `ALU_SUB : `ALU_ADD;
3'h1: alu_op = `ALU_SLL;
3'h2: alu_op = `ALU_SLT;
3'h3: alu_op = `ALU_SLTU;
3'h4: alu_op = `ALU_XOR;
3'h5: alu_op = (func7 == 7'h0) ? `ALU_SRL : `ALU_SRA;
3'h6: alu_op = `ALU_OR;
3'h7: alu_op = `ALU_AND;
default:;
endcase
end
end
// CSR
wire is_csr_imm = is_csr && (func3[2] == 1);
always @(*) begin
csr_op = `CSR_OTHER;
case (func3[1:0])
2'h1: csr_op = `CSR_RW;
2'h2: csr_op = `CSR_RS;
2'h3: csr_op = `CSR_RC;
default:;
endcase
end
// MUL
`ifdef EXT_M_ENABLE
wire is_mul = is_rtype && (func7 == 7'h1);
always @(*) begin
mul_op = `MUL_MUL;
case (func3)
3'h0: mul_op = `MUL_MUL;
3'h1: mul_op = `MUL_MULH;
3'h2: mul_op = `MUL_MULHSU;
3'h3: mul_op = `MUL_MULHU;
3'h4: mul_op = `MUL_DIV;
3'h5: mul_op = `MUL_DIVU;
3'h6: mul_op = `MUL_REM;
3'h7: mul_op = `MUL_REMU;
default:;
endcase
end
`else
wire is_mul = 0;
always @(*) begin
mul_op = `MUL_MUL;
end
`endif
// FPU
`ifdef EXT_F_ENABLE
wire is_fl = (opcode == `INST_FL) && ((func3 == 2));
wire is_fs = (opcode == `INST_FS) && ((func3 == 2));
wire is_fci = (opcode == `INST_FCI);
wire is_fmadd = (opcode == `INST_FMADD);
wire is_fmsub = (opcode == `INST_FMSUB);
wire is_fnmsub = (opcode == `INST_FNMSUB);
wire is_fnmadd = (opcode == `INST_FNMADD);
wire is_fcmp = is_fci && (func7 == 7'h50); // compare
wire is_fcvti = is_fci && (func7 == 7'h60); // convert to int
wire is_fcvtf = is_fci && (func7 == 7'h68); // convert to float
wire is_fmvw_clss = is_fci && (func7 == 7'h70); // move to int + class
wire is_fmvx = is_fci && (func7 == 7'h78); // move to float
wire is_fr4 = is_fmadd || is_fmsub || is_fnmsub || is_fnmadd;
wire is_fpu_no_mem = is_fci || is_fr4;
wire is_fpu = is_fl || is_fs || is_fci || is_fr4;
reg [`MOD_BITS-1:0] frm;
reg is_fsqrt;
always @(*) begin
fpu_op = `FPU_MISC;
frm = func3;
is_fsqrt = 0;
if (is_fr4) begin
case ({is_fmadd, is_fmsub, is_fnmsub, is_fnmadd})
4'b1000: fpu_op = `FPU_MADD;
4'b0100: fpu_op = `FPU_MSUB;
4'b0010: fpu_op = `FPU_NMSUB;
4'b0001: fpu_op = `FPU_NMADD;
default:;
endcase
end else begin
case (func7)
7'h00: fpu_op = `FPU_ADD;
7'h04: fpu_op = `FPU_SUB;
7'h08: fpu_op = `FPU_MUL;
7'h0C: fpu_op = `FPU_DIV;
7'h10: begin
fpu_op = `FPU_MISC;
frm = func3[1] ? 3'b010 : {2'b0, func3[0]};
end
7'h14: begin
fpu_op = `FPU_MISC;
frm = (func3 == 3'h0) ? 3'b011 : 3'b100;
end
7'h2C: begin
fpu_op = `FPU_SQRT;
is_fsqrt = 1;
end
7'h50: fpu_op = `FPU_CMP; // wb to intReg
7'h60: fpu_op = (instr[20]) ? `FPU_CVTWUS : `FPU_CVTWS; // doesn't need rs2, and read rs1 from fpReg, WB to intReg
7'h68: fpu_op = (instr[20]) ? `FPU_CVTSWU : `FPU_CVTSW; // doesn't need rs2, and read rs1 from intReg
7'h70: begin
fpu_op = (func3 == 3'h0) ? `FPU_MISC : `FPU_CLASS;
frm = (func3 == 3'h0) ? 5 : func3;
end
7'h78: begin fpu_op = `FPU_MISC; frm = 6; end
default:;
endcase
end
end
`else
wire is_fl = 0;
wire is_fs = 0;
wire is_fci = 0;
wire is_fcvti = 0;
wire is_fcvtf = 0;
wire is_fmvw_clss = 0;
wire is_fmvx = 0;
wire is_fr4 = 0;
wire is_fpu = 0;
wire is_fpu_no_mem= 0;
wire [2:0] frm = 0;
wire is_fsqrt = 0;
always @(*) begin
fpu_op = `FPU_MISC;
end
`endif
// LSU
wire is_lsu = (is_ltype || is_stype || is_fl || is_fs);
always @(*) begin
lsu_op = (is_fl || is_fs) ? `LSU_SW : func3;
end
// GPU
reg is_gpu_bar, is_qpu_spawn;
always @(*) begin
gpu_op = `GPU_OTHER;
is_gpu_bar = 0;
is_qpu_spawn = 0;
case (func3)
3'h0: gpu_op = `GPU_TMC;
3'h1: begin
gpu_op = `GPU_WSPAWN;
is_qpu_spawn = 1;
end
3'h2: gpu_op = `GPU_SPLIT;
3'h3: gpu_op = `GPU_JOIN;
3'h4: begin
gpu_op = `GPU_BAR;
is_gpu_bar = 1;
`endif
`INST_GPU: begin
ex_type = `EX_GPU;
case (func3)
3'h0: begin
op_type = `OP_BITS'(`GPU_TMC);
use_rs1 = 1;
is_wstall = 1;
end
3'h1: begin
op_type = `OP_BITS'(`GPU_WSPAWN);
use_rs1 = 1;
use_rs2 = 1;
end
3'h2: begin
op_type = `OP_BITS'(`GPU_SPLIT);
use_rs1 = 1;
is_wstall = 1;
end
3'h3: begin
op_type = `OP_BITS'(`GPU_JOIN);
is_join = 1;
end
3'h4: begin
op_type = `OP_BITS'(`GPU_BAR);
use_rs1 = 1;
use_rs2 = 1;
is_wstall = 1;
end
default:;
endcase
end
default:;
endcase
end
///////////////////////////////////////////////////////////////////////////
// EX_ALU needs rs1=0 for LUI operation
wire [4:0] rs1_qual = (opcode == `INST_LUI) ? 5'h0 : rs1;
wire use_rd = (is_fl || is_fci || is_fr4)
|| ((is_itype || is_rtype || is_lui || is_auipc || is_csr || is_jal || is_jalr || is_jals || is_ltype) && (rd != 0));
wire use_rs1 = is_fpu
|| is_gpu
|| (is_jalr || is_btype || is_ltype || is_stype || is_itype || is_rtype || !is_csr_imm || is_gpu);
wire use_rs2 = (is_fpu && ~(is_fl || is_fsqrt || is_fcvti || is_fcvtf || is_fmvw_clss || is_fmvx))
|| (is_gpu && (is_gpu_bar || is_qpu_spawn))
|| (is_btype || is_stype || is_rtype);
wire use_rs3 = is_fr4;
wire [4:0] rs1_qual = is_lui ? 5'h0 : rs1;
///////////////////////////////////////////////////////////////////////////
assign decode_if.valid = ifetch_rsp_if.valid;
assign decode_if.wid = ifetch_rsp_if.wid;
assign decode_if.tmask = ifetch_rsp_if.tmask;
assign decode_if.PC = ifetch_rsp_if.PC;
assign decode_if.ex_type = is_gpu ? `EX_GPU :
is_csr ? `EX_CSR :
is_fpu_no_mem ? `EX_FPU :
is_lsu ? `EX_LSU :
(is_br || is_rtype || is_itype || is_lui || is_auipc) ? `EX_ALU :
`EX_NOP;
assign decode_if.op_type = is_gpu ? `OP_BITS'(gpu_op) :
is_csr ? `OP_BITS'(csr_op) :
is_mul ? `OP_BITS'(mul_op) :
is_fpu_no_mem ? `OP_BITS'(fpu_op) :
is_lsu ? `OP_BITS'(lsu_op) :
is_br ? `OP_BITS'(br_op) :
`OP_BITS'(alu_op);
assign decode_if.wb = use_rd && (decode_if.ex_type != `EX_NOP);
assign decode_if.valid = ifetch_rsp_if.valid;
assign decode_if.wid = ifetch_rsp_if.wid;
assign decode_if.tmask = ifetch_rsp_if.tmask;
assign decode_if.PC = ifetch_rsp_if.PC;
assign decode_if.ex_type= ex_type;
assign decode_if.op_type= op_type;
assign decode_if.op_mod = op_mod;
assign decode_if.wb = use_rd;
`ifdef EXT_F_ENABLE
wire rd_is_fp = is_fpu && ~(is_fcmp || is_fcvti || is_fmvw_clss);
wire rs1_is_fp = is_fr4 || (is_fci && ~(is_fcvtf || is_fmvx));
wire rs2_is_fp = is_fs || is_fr4 || is_fci;
assign decode_if.rd = {rd_is_fp, rd};
assign decode_if.rs1 = {rs1_is_fp, rs1_qual};
assign decode_if.rs2 = {rs2_is_fp, rs2};
assign decode_if.rs3 = {1'b1, rs3};
assign decode_if.rd = {rd_fp, rd};
assign decode_if.rs1 = {rs1_fp, rs1_qual};
assign decode_if.rs2 = {rs2_fp, rs2};
assign decode_if.rs3 = {1'b1, rs3};
`else
assign decode_if.rd = rd;
assign decode_if.rs1 = rs1_qual;
assign decode_if.rs1 = rs1;
assign decode_if.rs2 = rs2;
assign decode_if.rs3 = rs3;
`endif
assign decode_if.imm = imm;
assign decode_if.rs1_is_PC = use_PC;
assign decode_if.rs2_is_imm = use_imm;
assign decode_if.used_regs = (`NUM_REGS'(use_rd) << decode_if.rd)
| (`NUM_REGS'(use_rs1) << decode_if.rs1)
| (`NUM_REGS'(use_rs2) << decode_if.rs2)
| (`NUM_REGS'(use_rs3) << decode_if.rs3);
assign decode_if.imm = (is_lui || is_auipc) ? {upper_imm, 12'(0)} :
(is_jal || is_jalr || is_jals) ? jalx_offset :
is_csr ? 32'(u_12) :
src2_imm;
assign decode_if.rs1_is_PC = is_auipc || is_btype || is_jal || is_jals;
assign decode_if.rs2_is_imm = is_itype || is_lui || is_auipc || is_csr_imm || is_br;
wire [`MOD_BITS-1:0] alu_mod = {1'b0, is_mul, is_br};
assign decode_if.op_mod = is_fpu_no_mem ? frm : alu_mod;
///////////////////////////////////////////////////////////////////////////
wire decode_fire_unqual = ifetch_rsp_if.valid && decode_if.ready;
wire ifetch_rsp_fire = ifetch_rsp_if.valid && ifetch_rsp_if.ready;
assign join_if.valid = decode_fire_unqual && is_gpu && (gpu_op == `GPU_JOIN);
assign join_if.valid = ifetch_rsp_fire && is_join;
assign join_if.wid = ifetch_rsp_if.wid;
assign wstall_if.valid = decode_fire_unqual && (is_btype
|| is_jal
|| is_jalr
|| (is_gpu && (gpu_op == `GPU_TMC
|| gpu_op == `GPU_SPLIT
|| gpu_op == `GPU_BAR)));
assign wstall_if.valid = ifetch_rsp_fire && is_wstall;
assign wstall_if.wid = ifetch_rsp_if.wid;
///////////////////////////////////////////////////////////////////////////
assign ifetch_rsp_if.ready = decode_if.ready;
`ifdef DBG_PRINT_PIPELINE
@ -405,7 +410,7 @@ module VX_decode #(
print_ex_type(decode_if.ex_type);
$write(", op=");
print_ex_op(decode_if.ex_type, decode_if.op_type, decode_if.op_mod);
$write(", mod=%0d, tmask=%b, wb=%b, rd=%0d, rs1=%0d, rs2=%0d, rs3=%0d, imm=%0h, use_pc=%b, use_imm=%b\n", decode_if.op_mod, decode_if.tmask, decode_if.wb, decode_if.rd, decode_if.rs1, decode_if.rs2, decode_if.rs3, decode_if.imm, decode_if.rs1_is_PC, decode_if.rs2_is_imm);
$write(", mod=%0d, tmask=%b, wb=%b, rd=%0d, rs1=%0d, rs2=%0d, rs3=%0d, imm=%0h, use_pc=%b, use_imm=%b, use_regs=%b\n", decode_if.op_mod, decode_if.tmask, decode_if.wb, decode_if.rd, decode_if.rs1, decode_if.rs2, decode_if.rs3, decode_if.imm, decode_if.rs1_is_PC, decode_if.rs2_is_imm, decode_if.used_regs);
end
end
`endif

View file

@ -149,21 +149,21 @@
`define CSR_OP(x) x[`CSR_BITS-1:0]
`define FPU_ADD 4'h0
`define FPU_SUB 4'h1
`define FPU_MUL 4'h2
`define FPU_DIV 4'h3
`define FPU_SQRT 4'h4
`define FPU_MADD 4'h5
`define FPU_MSUB 4'h6
`define FPU_NMSUB 4'h7
`define FPU_NMADD 4'h8
`define FPU_CVTWS 4'h9 // FCVT.W.S
`define FPU_CVTWUS 4'hA // FCVT.WU.S
`define FPU_CVTSW 4'hB // FCVT.S.W
`define FPU_CVTSWU 4'hC // FCVT.S.WU
`define FPU_CLASS 4'hD
`define FPU_CMP 4'hE
`define FPU_MISC 4'hF // SGNJ, SGNJN, SGNJX, FMIN, FMAX, MVXW, MVWX
`define FPU_SUB 4'h4
`define FPU_MUL 4'h8
`define FPU_DIV 4'hC
`define FPU_CVTWS 4'h1 // FCVT.W.S
`define FPU_CVTWUS 4'h5 // FCVT.WU.S
`define FPU_CVTSW 4'h9 // FCVT.S.W
`define FPU_CVTSWU 4'hD // FCVT.S.WU
`define FPU_SQRT 4'h2
`define FPU_CLASS 4'h6
`define FPU_CMP 4'hA
`define FPU_MISC 4'hE // SGNJ, SGNJN, SGNJX, FMIN, FMAX, MVXW, MVWX
`define FPU_MADD 4'h3
`define FPU_MSUB 4'h7
`define FPU_NMSUB 4'hB
`define FPU_NMADD 4'hF
`define FPU_BITS 4
`define FPU_OP(x) x[`FPU_BITS-1:0]