How to add an GCC parameter?

[Joseph]

Hi,
  I've checked the i386.c file.
  But I am curious about something as follows.
  1. "large" insn 
  2.  MOVE_RATIO 
  3.  cost for loading QImode using movzbl 
 Does anybody know what those mean?
 Any help is appreciateed.
Best Regards,
             Joseph

 A part in the i386.c file
   struct processor_costs pentiumpro_cost = {
     1,     /* cost of an add instruction */
     ........
     8,     /* "large" insn */
     6,     /* MOVE_RATIO */
     2,     /* cost for loading QImode using movzbl */
     .......
      32,     /* size of prefetch block */
     6,     /* number of parallel prefetches */
   };


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