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minor update

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This commit is contained in:
Blaise Tine
2020-08-31 06:17:49 -07:00
parent 0a0b28aac0
commit af84e01856
21 changed files with 870 additions and 889 deletions
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44
hw/rtl/VX_alu_unit.v
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@@ -13,11 +13,11 @@ module VX_alu_unit #(
VX_branch_ctl_if branch_ctl_if,
VX_exu_to_cmt_if alu_commit_if
);
reg [`NUM_THREADS-1:0][31:0] alu_result;
reg [`NUM_THREADS-1:0][31:0] alu_result;
reg [`NUM_THREADS-1:0][31:0] add_result;
reg [`NUM_THREADS-1:0][32:0] sub_result;
reg [`NUM_THREADS-1:0][31:0] shift_result;
reg [`NUM_THREADS-1:0][31:0] misc_result;
reg [`NUM_THREADS-1:0][31:0] shr_result;
reg [`NUM_THREADS-1:0][31:0] msc_result;
wire is_br_op = alu_req_if.is_br_op;
wire [`ALU_BITS-1:0] alu_op = `ALU_OP(alu_req_if.op_type);
@@ -48,23 +48,23 @@ module VX_alu_unit #(
end
for (genvar i = 0; i < `NUM_THREADS; i++) begin
wire [32:0] shift_in1 = {alu_signed & alu_in1[i][31], alu_in1[i]};
wire [32:0] shr_in1 = {alu_signed & alu_in1[i][31], alu_in1[i]};
`IGNORE_WARNINGS_BEGIN
wire [32:0] shift_value = $signed(shift_in1) >>> alu_in2_imm[i][4:0];
wire [32:0] shr_value = $signed(shr_in1) >>> alu_in2_imm[i][4:0];
`IGNORE_WARNINGS_END
always @(*) begin
shift_result[i] = shift_value[31:0];
shr_result[i] = shr_value[31:0];
end
end
for (genvar i = 0; i < `NUM_THREADS; i++) begin
always @(*) begin
case (alu_op)
`ALU_AND: misc_result[i] = alu_in1[i] & alu_in2_imm[i];
`ALU_OR: misc_result[i] = alu_in1[i] | alu_in2_imm[i];
`ALU_XOR: misc_result[i] = alu_in1[i] ^ alu_in2_imm[i];
`ALU_AND: msc_result[i] = alu_in1[i] & alu_in2_imm[i];
`ALU_OR: msc_result[i] = alu_in1[i] | alu_in2_imm[i];
`ALU_XOR: msc_result[i] = alu_in1[i] ^ alu_in2_imm[i];
//`ALU_SLL,
default: misc_result[i] = alu_in1[i] << alu_in2_imm[i][4:0];
default: msc_result[i] = alu_in1[i] << alu_in2_imm[i][4:0];
endcase
end
end
@@ -74,21 +74,20 @@ module VX_alu_unit #(
case (alu_op_class)
0: alu_result[i] = add_result[i];
1: alu_result[i] = {31'b0, sub_result[i][32]};
2: alu_result[i] = is_sub ? sub_result[i][31:0] : shift_result[i];
default: alu_result[i] = misc_result[i];
2: alu_result[i] = is_sub ? sub_result[i][31:0] : shr_result[i];
default: alu_result[i] = msc_result[i];
endcase
end
end
wire is_jal = is_br_op && (br_op == `BR_JAL || br_op == `BR_JALR);
wire [`NUM_THREADS-1:0][31:0] alu_jal_result = is_jal ? {`NUM_THREADS{alu_req_if.next_PC}} : alu_result;
wire [`NUM_THREADS-1:0][31:0] alu_jal_result = is_jal ? {`NUM_THREADS{alu_req_if.next_PC}} : alu_result;
wire [31:0] br_dest = add_result[alu_req_if.tid];
wire [32:0] cmp_result = sub_result[alu_req_if.tid];
wire is_less = cmp_result[32];
wire is_equal = ~(| cmp_result[31:0]);
wire [32:0] cmp_result = sub_result[alu_req_if.tid];
wire is_br_op_r, is_less_r, is_equal_r;
wire [32:0] cmp_result_r;
wire is_br_op_r;
`IGNORE_WARNINGS_BEGIN
wire [`BR_BITS-1:0] br_op_r;
`IGNORE_WARNINGS_END
@@ -98,20 +97,23 @@ module VX_alu_unit #(
wire stall_out = ~alu_commit_if.ready && alu_commit_if.valid;
VX_generic_register #(
.N(1 + `NW_BITS + `NUM_THREADS + 32 + `NR_BITS + 1 + (`NUM_THREADS * 32) + 1 + `BR_BITS + 1 + 1 + 32)
.N(1 + `NW_BITS + `NUM_THREADS + 32 + `NR_BITS + 1 + (`NUM_THREADS * 32) + 1 + `BR_BITS + 32 + 33)
) alu_reg (
.clk (clk),
.reset (reset),
.stall (stall_out),
.flush (1'b0),
.in ({alu_req_if.valid, alu_req_if.wid, alu_req_if.thread_mask, alu_req_if.curr_PC, alu_req_if.rd, alu_req_if.wb, alu_jal_result, is_br_op, br_op, is_less, is_equal, br_dest}),
.out ({alu_commit_if.valid, alu_commit_if.wid, alu_commit_if.thread_mask, alu_commit_if.curr_PC, alu_commit_if.rd, alu_commit_if.wb, alu_commit_if.data, is_br_op_r, br_op_r, is_less_r, is_equal_r, branch_ctl_if.dest})
.in ({alu_req_if.valid, alu_req_if.wid, alu_req_if.thread_mask, alu_req_if.curr_PC, alu_req_if.rd, alu_req_if.wb, alu_jal_result, is_br_op, br_op, br_dest, cmp_result}),
.out ({alu_commit_if.valid, alu_commit_if.wid, alu_commit_if.thread_mask, alu_commit_if.curr_PC, alu_commit_if.rd, alu_commit_if.wb, alu_commit_if.data, is_br_op_r, br_op_r, branch_ctl_if.dest, cmp_result_r})
);
wire is_less = cmp_result_r[32];
wire is_equal = ~(| cmp_result_r[31:0]);
wire br_neg = `BR_NEG(br_op_r);
wire br_less = `BR_LESS(br_op_r);
wire br_static = `BR_STATIC(br_op_r);
wire br_taken = ((br_less ? is_less_r : is_equal_r) ^ br_neg) | br_static;
wire br_taken = ((br_less ? is_less : is_equal) ^ br_neg) | br_static;
assign branch_ctl_if.valid = alu_commit_if.valid && alu_commit_if.ready && is_br_op_r;
assign branch_ctl_if.wid = alu_commit_if.wid;