Is '<<<' a rotation operator in verilog?

Question

whether <<< 1 will do a left circular rotation by 1 bit. I want to know whether this operator exists?? Whether it will do a left circular rotation by 1 bit or I have to use concatenation for this.

Answer 1

No <<< is an arithmetic left shift operator which pads 0 at the right while keeping the sign if it is signed. But rather << is a logical left shift which does the same but will not consider the sign.

Yes, you need to use concatenation.

The easiest way would be

wire [7:0] in;
wire [7:0] out;

assign out = {in[6:0], in[7]};

Ref http://vlsi.pro/verilog-operators/#shift