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minor update

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This commit is contained in:
Blaise Tine 2021-09-11 18:16:08 -07:00
parent 12704f9929
commit 6652e2f0e9
1 changed files with 24 additions and 41 deletions
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65
hw/rtl/libs/VX_find_first.v
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@ -12,50 +12,33 @@ module VX_find_first #(
output wire [DATAW-1:0] data_o,
output wire valid_o
);
if (N > 1) begin
wire [N-1:0] valid_r;
wire [N-1:0][DATAW-1:0] data_r;
localparam TL = (1 << LOGN) - 1;
localparam TN = (1 << (LOGN+1)) - 1;
for (genvar i = 0; i < N; ++i) begin
assign valid_r[i] = REVERSE ? valid_i[N-1-i] : valid_i[i];
assign data_r[i] = REVERSE ? data_i[N-1-i] : data_i[i];
`IGNORE_WARNINGS_BEGIN
wire [TN-1:0] s_n;
wire [TN-1:0][DATAW-1:0] d_n;
`IGNORE_WARNINGS_END
for (genvar i = 0; i < N; ++i) begin
assign s_n[TL+i] = REVERSE ? valid_i[N-1-i] : valid_i[i];
assign d_n[TL+i] = REVERSE ? data_i[N-1-i] : data_i[i];
end
for (genvar i = TL+N; i < TN; ++i) begin
assign s_n[i] = 0;
assign d_n[i] = 'x;
end
for (genvar j = 0; j < LOGN; ++j) begin
for (genvar i = 0; i < (2**j); ++i) begin
assign s_n[2**j-1+i] = s_n[2**(j+1)-1+i*2] | s_n[2**(j+1)-1+i*2+1];
assign d_n[2**j-1+i] = s_n[2**(j+1)-1+i*2] ? d_n[2**(j+1)-1+i*2] : d_n[2**(j+1)-1+i*2+1];
end
`IGNORE_WARNINGS_BEGIN
wire [2**LOGN-1:0] s_n;
wire [2**LOGN-1:0][DATAW-1:0] d_n;
`IGNORE_WARNINGS_END
for (genvar i = 0; i < LOGN; ++i) begin
if (i == (LOGN-1)) begin
for (genvar j = 0; j < 2**i; ++j) begin
if ((j*2) < (N-1)) begin
assign s_n[2**i-1+j] = valid_r[j*2] | valid_r[j*2+1];
assign d_n[2**i-1+j] = valid_r[j*2] ? data_r[j*2] : data_r[j*2+1];
end
if ((j*2) == (N-1)) begin
assign s_n[2**i-1+j] = valid_r[j*2];
assign d_n[2**i-1+j] = data_r[j*2];
end
if ((j*2) > (N-1)) begin
assign s_n[2**i-1+j] = 0;
assign d_n[2**i-1+j] = 'x;
end
end
end else begin
for (genvar j = 0; j < 2**i; ++j) begin
assign s_n[2**i-1+j] = s_n[2**(i+1)-1+j*2] | s_n[2**(i+1)-1+j*2+1];
assign d_n[2**i-1+j] = s_n[2**(i+1)-1+j*2] ? d_n[2**(i+1)-1+j*2] : d_n[2**(i+1)-1+j*2+1];
end
end
end
end
assign valid_o = s_n[0];
assign data_o = d_n[0];
end else begin
assign valid_o = valid_i;
assign data_o = data_i[0];
end
assign valid_o = s_n[0];
assign data_o = d_n[0];
endmodule
`TRACING_ON