Verilog shift operator

Shift operator

Shift operators include shift left （<<）, Move right （>>）, Arithmetic shift left （<<<）, Arithmetic shift right （>>>）.

The shift operator is a binocular operator , The two operands respectively represent the vector signal to be shifted （ To the left of the operator ） And the number of bits moved （ To the right of the operator ）.

Arithmetic shift left and logical shift left , The low position on the right will be filled 0.

When logic moves right , The high position on the left will be filled 0; When arithmetic is shifted to the right , The high bit on the left will be supplemented by the sign bit , To ensure the correctness of the value after data reduction .

Shift can sometimes replace multiplication and division .

example

A = 4'b1100 ;
B = 4'b0010 ;
A = A >> 2 ;        // The result is 4'b0011
A = A << 1;         // The result is 4'b1000
A = A <<< 1 ;       // The result is 4'b1000
C = B + (A>>>2);    // The result is 2 + (-4/4) = 1, 4'b0001