[LLVMdev] Modifying LoopUnrollingPass

[yaduveer singh]

Hi Michael,

Thank you very much!
I will try this.

Regards,
Yaduveer


On Sun, May 3, 2015 at 12:11 AM, Michael Zolotukhin <mzolotukhin at apple.com>
wrote:

> 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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>
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