// Written by Amit Pandey`define SHIFT_TYPE1 2'b00 `define SHIFT_TYPE2 2'b01 `define SHIFT_TYPE3 2'b10 `define SHIFT_TYPE4 2'b11 module shift_maker(ir2, Reg_value, SAM_Ctrl,BS_Shift_Amt,BS_Shift_Type);input [31:0] ir2, Reg_value;input [1:0] SAM_Ctrl;output [4:0] BS_Shift_Amt;output [1:0] BS_Shift_Type;wire [31:0]  ir2, Reg_value;wire [1:0] SAM_Ctrl;reg [4:0] BS_Shift_Amt;reg [1:0] BS_Shift_Type;always @(ir2 or Reg_value or SAM_Ctrl)begin   // SHIFT_TYPE1 = offset specified by shifting immediate value    if( SAM_Ctrl == `SHIFT_TYPE1)   begin	BS_Shift_Amt = ir2[11:7];	BS_Shift_Type = ir2[6:5];   end   else      // SHIFT_TYPE2 == offset specified by shifting the value contained in      // register (ir2[11:8])      if( SAM_Ctrl == `SHIFT_TYPE2 )      begin        BS_Shift_Amt =  Reg_value[4:0];        BS_Shift_Type = ir2[6:5];      end    else     // SHIFT_TYPE3 == special case where logical shift left by 2      if( SAM_Ctrl == `SHIFT_TYPE3 )      begin        BS_Shift_Amt =  4'b0010;        BS_Shift_Type = 2'b00;      end 	   else      // SHIFT_TYPE4 == special case for data processing instructions where       // shift amount is calculated by rotating an immediate value      if( SAM_Ctrl == `SHIFT_TYPE4 )      begin        BS_Shift_Amt =  { ir2[11:8], 1'b0 };        BS_Shift_Type = 2'b11;      endendendmodule