[LLVMdev] How to unroll loop with non-constant boundary

[Stepan Dyatkovskiy]

Hi guys, 
I attached the modified patch that handles cases with low==end and stride!=1.
Please find it for review.

-Stepan

28.02.2012, 17:41, "Benjamin Kramer" <benny.kra at googlemail.com>:
> On 27.02.2012, at 20:17, Duncan Sands wrote:
>
>>  Hi Benjamin,
>>>  LLVM misses this optimization because ScalarEvolution's ComputeExitLimitFromICmp doesn't handle signed<= (SLE) and thus can't compute the number of times the loop is executed. I wonder if there's a reason for this, it seems like something simple to add.
>>  instsimplify could also be enhanced to clean it up in this particular case, but
>>  it would be better to make scev smarter.
>
> I filed http://llvm.org/bugs/show_bug.cgi?id=12110 to track this.
>
> - Ben
>
>>  Ciao, Duncan.
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