fork download
copy 
  1.  
  2.  
  3.  
  4. class Instruction
  5. {
  6.  String inst;
  7.  int history;
  8.  Instruction()
  9.  {
  10.   history=0; // Assume Strongly Taken
  11.  }
  12. }
  13.  
  14.  
  15.  
  16. class BranchPredictionLogic
  17. {
  18.  public static void main(String args[]) throws Exception
  19.  {
  20.   int d,ch;
  21.   String his="Strongly Taken";
  22.   Instruction i1;
  23.   String HistoryArray[]={"Strongly Taken","Weakly Taken","Weakly Not Taken","Strongly Not Taken"};
  24.   BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
  25.   System.out.println("Active Prefetch Queue A");
  26.  
  27.   i1=new Instruction();
  28.   System.out.println("Enter instructions:");
  29.   while(true)
  30.   {
  31.    i1.inst=br.readLine();
  32.    if(isBranchInst(i1.inst)==true)
  33.    break;
  34.   }
  35.  
  36.   System.out.println(i1.inst+" is a Branch Instruction");
  37.  
  38.   System.out.println("\n\n***DECODE1 STAGE***");
  39.   System.out.println("*****Branch Target Buffer*****");
  40.  
  41.   System.out.println("Source:----\nTarget:-----\nHistory: Strongly Taken");
  42.   do{
  43.   System.out.println("\n\n\n*****EXECUTE STAGE*****");
  44.   System.out.println("Does branch take place?? Enter 1 or 0 : ");
  45.   d=Integer.parseInt(br.readLine());
  46.  
  47.   updateLogic(i1,d);
  48.  
  49.   System.out.println("***New Branch Target Buffer***");
  50.   his=HistoryArray[i1.history];
  51.   System.out.println("Source:----\nTarget:----\nHistory: "+his);
  52.  
  53.   System.out.println("Do you want to continue:(1/0): ");
  54.   ch=Integer.parseInt(br.readLine());
  55.  
  56.   }while(ch!=0);
  57.  
  58.  }
  59.  
  60.  public static boolean isBranchInst(String x)
  61.  {
  62.   String jumpInstructions[]={"JC","JMP"};
  63.  
  64.   for(int i=0;i<jumpInstructions.length;i++)
  65.    if(x.equals(jumpInstructions[i])==true)
  66.    return true;
  67.  
  68.   return false;
  69.  }
  70.  
  71.  public static void updateLogic(Instruction i,int n)
  72.  {
  73.   int history[]={0,1,2,3};
  74.   int historyAfterTaken[]={0,0,1,2};
  75.   int historyNotTaken[]={1,2,3,3};
  76.  
  77.   if(n==1)
  78.   {
  79.    System.out.println("\nContents of B queue are valid!!!!!");
  80.    i.history=historyAfterTaken[i.history];
  81.   }
  82.   else if(n==0)
  83.   {
  84.    System.out.println("Contents of B queue not valid\nActive PrefetchQueue is A");
  85.    i.history=historyNotTaken[i.history];
  86.   }
  87.  }
  88. }
  89.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
copy 
Standard input is empty
compilation info 
Main.java:24: error: cannot find symbol
  BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
  ^
  symbol:   class BufferedReader
  location: class BranchPredictionLogic
Main.java:24: error: cannot find symbol
  BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
                        ^
  symbol:   class BufferedReader
  location: class BranchPredictionLogic
Main.java:24: error: cannot find symbol
  BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
                                           ^
  symbol:   class InputStreamReader
  location: class BranchPredictionLogic
3 errors
stdout
copy 
Standard output is empty
https://ideone.com/ne3AEp
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!