Xavi/cvw
1
0
Fork 0
forked from Github_Repos/cvw
Code Issues Pull Requests Packages Projects Releases Wiki Activity

zbb handles popcnt and passes lint

Browse Source
This commit is contained in:
Kevin Kim 2023-02-05 00:11:24 +00:00
parent 5200ed3d2e
commit 0758a272f5
1 changed files with 24 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
pipelined/src/ieu/zbb.sv
View File

@ -40,35 +40,52 @@ module zbb #(parameter WIDTH=32) (
//count instructions
logic [WIDTH-1:0] czResult;
logic [WIDTH-1:0] clzResult; //leading zeros result
logic [WIDTH-1:0] ctzResult; //trailing zeros result
logic [WIDTH-1:0] clzResult; //leading zeros result
logic [WIDTH-1:0] ctzResult; //trailing zeros result
logic [WIDTH-1:0] cpopResult; //population count result
logic [WIDTH-1:0] clzA, clzB;
logic [WIDTH-1:0] clzwA, clzwB;
logic [WIDTH-1:0] ctzA, ctzB;
logic [WIDTH-1:0] ctzwA, ctzwB;
logic [WIDTH-1:0] clzResult, ctzResult;
logic [WIDTH-1:0] cpopwA, cpopA;
logic [WIDTH-1:0] cpopwB, cpopB;
//in both rv64, rv32
assign clzA = A;
bitreverse #(WIDTH) brtz(.a(A), .b(ctzA));
//only in rv64
assign clzwA = {A[31:0],{32{1'b1}}};
bitreverse #(WIDTH) brtzw(.a({{32{1'b1}},A[31:0]}), .b(ctzwA));
if (WIDTH==64) begin
assign clzwA = {A[31:0],{32{1'b1}}};
bitreverse #(WIDTH) brtzw(.a({{32{1'b1}},A[31:0]}), .b(ctzwA));
assign cpopwA = {{32{1'b0}},A};
//NOTE: Can be simplified to a single lzc with a 4-select mux.
end
else begin
assign clzwA = 32'b0;
assign ctzwA = 32'b0;
assign cpopwA = 32'b0;
end
//NOTE: Can be simplified to a single lzc with a 4-select mux. We are currently producing all cz results and selecting from those later.
//NOTE: Signal width mistmatch from log2(WIDTH) to WIDTH but deal with that later.
lzc #(WIDTH) lzc(.num(clzA), .ZeroCnt(clzB));
lzc #(WIDTH) lzwc(.num(clzwA), .ZeroCnt(clzwB));
lzc #(WIDTH) tzc(.num(ctzA), .ZeroCnt(ctzB));
lzc #(WIDTH) tzwc(.num(ctzwA), .ZeroCnt(ctzwB));
popcnt #(WIDTH) popcntw(.num(cpopwA), .PopCnt(cpopwB));
popcnt #(WIDTH) popcnt(.num(cpopA), .PopCnt(cpopB));
if (WIDTH==64) begin
assign clzResult = W64 ? clzwB : clzB;
assign ctzResult = W64 ? ctzwB : ctzB;
assign cpopResult = W64 ? cpopwB : cpopB;
end
else begin
assign clzResult = clzB;
assign ctzResult = ctzB;
assign cpopResult = cpopB;
end
@ -100,7 +117,7 @@ module zbb #(parameter WIDTH=32) (
15'b0110100_101_11000: ZBBResult = Rev8Result;
15'b0110101_101_11000: ZBBResult = Rev8Result;
15'b0110000_001_00000: ZBBResult = clzResult;
15'b0110000_001_00010: //cpopResult goes here
15'b0110000_001_00010: ZBBResult = cpopResult;
15'b0110000_001_00001: ZBBResult = ctzResult;
15'b0110101_101_11000: ZBBResult = Rev8Result;
15'b0110101_101_11000: ZBBResult = Rev8Result;