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how to understand some terminologys about software pipeline information?

Armstrong
Intellectual 820 points

 Searching for software pipeline schedule at ... ;*     

    ii = 9  Schedule found with 4 iterations in parallel

1.

ii = 9; I understanded ,it depended " Loop Carried Dependency Bound(^) ",but as to "4 iterations " ,I didn't know how to get the number "4",

what does "4 iterations " mean?

2.

 Total cycles (est.)         : 27 + trip_cnt * 9     ------- quoted from  .asm  file.

 the same, I didn't know  what did " trip_cnt " mean? and how to get it?

 

  • TI__Guru**** 253390 points

    hongke zhang said:
    what does "4 iterations " mean?

    As described in this wiki article, a software pipelined loop overlaps some number of original source loops within it.  In this particular case, 4 iterations of the original source code loop overlap within the software pipeline loop.

    hongke zhang said:
    trip_cnt " mean? and how to get it?

    The trip count (trip_cnt for short) is number of times the loop iterates at run time.  In this particular case, it is used to show you how many CPU cycles are required to execute the loop.

    Thanks and regards,

    -George

  • in reply to George Mock
    Intellectual 820 points

    thx，George:

    As you said, for example,  a loop like this :  for(i=0;i<100;i++)  { do something} ;   if the software pipelined loop has 4 iterations

    like the following pic:

    and this picture means “5 iterations” ???

    Was my opinion wrong or right?  

  • in reply to Armstrong
    TI__Guru**** 253390 points

    hongke zhang said:
    Was my opinion wrong or right?  

    You are correct.  -George