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techlibs/common: more robustness when *_WIDTH = 0

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This commit is contained in:
Eddie Hung 2020-05-05 08:01:27 -07:00
parent e936ac61ea
commit 004999218f
3 changed files with 30 additions and 8 deletions
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29
techlibs/common/techmap.v
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@ -285,13 +285,32 @@ module _90_alu (A, B, CI, BI, X, Y, CO);
input CI, BI;
output [Y_WIDTH-1:0] CO;
wire [Y_WIDTH-1:0] A_buf, B_buf;
\$pos #(.A_SIGNED(A_SIGNED), .A_WIDTH(A_WIDTH), .Y_WIDTH(Y_WIDTH)) A_conv (.A(A), .Y(A_buf));
\$pos #(.A_SIGNED(B_SIGNED), .A_WIDTH(B_WIDTH), .Y_WIDTH(Y_WIDTH)) B_conv (.A(B), .Y(B_buf));
wire [Y_WIDTH-1:0] AA = A_buf;
wire [Y_WIDTH-1:0] AA, BB;
wire [Y_WIDTH-1:0] BB = BI ? ~B_buf : B_buf;
if (A_WIDTH == 0) begin
wire [Y_WIDTH-1:0] B_buf;
\$pos #(.A_SIGNED(B_SIGNED), .A_WIDTH(B_WIDTH), .Y_WIDTH(Y_WIDTH)) B_conv (.A(B), .Y(B_buf));
assign AA = {Y_WIDTH{1'b0}};
assign BB = BI ? ~B_buf : B_buf;
end
else if (B_WIDTH == 0) begin
wire [Y_WIDTH-1:0] A_buf;
\$pos #(.A_SIGNED(A_SIGNED), .A_WIDTH(A_WIDTH), .Y_WIDTH(Y_WIDTH)) A_conv (.A(A), .Y(A_buf));
assign AA = A_buf;
assign BB = {Y_WIDTH{BI ? 1'b0 : 1'b1}};
end
else begin
wire [Y_WIDTH-1:0] A_buf, B_buf;
\$pos #(.A_SIGNED(A_SIGNED), .A_WIDTH(A_WIDTH), .Y_WIDTH(Y_WIDTH)) A_conv (.A(A), .Y(A_buf));
\$pos #(.A_SIGNED(B_SIGNED), .A_WIDTH(B_WIDTH), .Y_WIDTH(Y_WIDTH)) B_conv (.A(B), .Y(B_buf));
assign AA = A_buf;
assign BB = BI ? ~B_buf : B_buf;
end
\$lcu #(.WIDTH(Y_WIDTH)) lcu (.P(X), .G(AA & BB), .CI(CI), .CO(CO));
assign X = AA ^ BB;