[LLVMdev] Modifying LoopUnrollingPass

[Michael Zolotukhin]

Hi Yaduveer,

As far as I remember, unroller in LoopVectorizer pass does what you want to achieve (look for a message "LV: Trying to at least unroll the loops.” to locate this in the code).

Michael

> On May 2, 2015, at 9:00 AM, yaduveer singh <yaduveer99 at gmail.com> wrote:
> 
> Hi Zhoulai,
> 
> I am trying to modify "LoopUnrollPass" in llvm which produces multiple
> copies of loop equal to the loop unroll factor.Currently, using multicore
> architecture, say 3 for example and the execution goes like:
> 
> for 3 cores if there are 9 iterations of loop
> core          instruction
> 1                   0,3,6
> 2                    1,4,7
> 3                    2,5,8
> 
> But I want to to modify such that it can execute in following way:
> 
> core          instruction
> 1                   0,1,2
> 2                   3,4,5
> 3                   6,7,8
> 
> I am not able to get where to modify for this. I tried creating a sample
> pass using original LoopUnrollPass code and run "make", I received
> following error:
> 
> loopunrollp.cpp:210:1: error: ‘void
> llvm::initializeLoopUnrollpPass(llvm::PassRegistry&)’ should have been
> declared inside ‘llvm’
> /bin/rm: cannot remove
> `/home/yaduveer/RP/LLVM/llvm/lib/Transforms/loopunrollp/Debug+Asserts/loopunrollp.d.tmp':
> No such file or directory
> 
> 
> Please help
> 
> Thanks,
> Yaduveer
> 
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