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Optimized Zbkx

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KelvinTr 2024-02-29 14:50:15 -06:00
parent e40ae126d3
commit 9f53c54f57
1 changed files with 15 additions and 12 deletions
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27
src/ieu/kmu/zbkx.sv
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@ -30,21 +30,24 @@ module zbkx #(parameter WIDTH=32)
input logic [2:0] ZBKXSelect,
output logic [WIDTH-1:0] ZBKXResult);
logic [WIDTH-1:0] xperm_lookup[0:WIDTH];
logic [WIDTH-1:0] xperm_lookup;
logic [WIDTH-1:0] XPERM8_Result;
logic [WIDTH-1:0] XPERM4_Result;
genvar i;
integer i;
for(i=0; i<WIDTH; i=i+8) begin: xperm8
assign xperm_lookup[i] = A >> {B[i+7:i], 3'b0};
assign XPERM8_Result[i+7:i] = xperm_lookup[i][7:0];
always_comb begin
if (ZBKXSelect[0] == 1'b0) begin
for(i=0; i<WIDTH; i=i+8) begin: xperm8
xperm_lookup = A >> {B[i+:8], 3'b0};
ZBKXResult[i+:8] = xperm_lookup[7:0];
end
end
else begin
for(i=0; i<WIDTH; i=i+4) begin: xperm4
xperm_lookup = A >> {B[i+:4], 2'b0};
ZBKXResult[i+:4] = xperm_lookup[3:0];
end
end
end
for(i=0; i<WIDTH; i=i+4) begin: xperm4
assign xperm_lookup[i+1] = A >> {B[i+3:i], 2'b0};
assign XPERM4_Result[i+3:i] = xperm_lookup[i+1][3:0];
end
mux2 #(WIDTH) ZbkxMux (XPERM8_Result, XPERM4_Result, ZBKXSelect[0], ZBKXResult);
endmodule