Review Board 2.0.15


O3: Let squashed and deferred instructions issue.

Review Request #767 - Created July 2, 2011 and submitted

Information
Gabe Black
gem5
Reviewers
Default
ali, gblack, nate, stever 
O3: Let squashed and deferred instructions issue.

Let squahsed and deferred instructions issue so they don't accumulate and clog
up the CPU.

   

  


 


 

  

  









  
 


  

 
















 



 

  


 


  



   

   
Ali Saidi

   
Posted  (July 10, 2011, 4:33 a.m.)


  


  


  

   



  

   

   
    
    
   


  




   







    

     
     

      

       
        

         
          src/cpu/o3/inst_queue_impl.hh
          

           (Diff revision 1)

          
         
        

       
       
        
 


        
 


       
      

     

    

    


     
Could you explain what is going on here? 

Previously these instructions did what? Sat here until the squash propagated? Is there a corner case of the translation currently being in progress and the instruction getting squashed and removed before this comes back?

 




  

   

   
    
    

   
  1. 
    
    
     
    
      
     
    
     
    Unfortunately no since it's been so long since I originally wrote this patch. I think what would happen is that squashed instructions would hang around here forever for whatever reason, and eventually O3 would get upset that there were too many instructions in flight.
    
    
    
   
    2.