module shift_right(sxt,a,b,shift_right);
  input sxt;
  input [31:0] a;
  input [4:0] b;
  output [31:0] shift_right;

  wire [31:0] w,x,y,z;
  wire sin;

  assign sin = sxt & a[31];
  assign w = b[0] ? {sin,a[31:1]} : a;
  assign x = b[1] ? {{2{sin}},w[31:2]} : w;
  assign y = b[2] ? {{4{sin}},x[31:4]} : x;
  assign z = b[3] ? {{8{sin}},y[31:8]} : y;
  assign shift_right = b[4] ? {{16{sin}},z[31:16]} : z;
endmodule