Lubomir Litchev e2394245eb Add an option for unrolling loops up to a factor.
Currently, there is no option to allow for unrolling a loop up to a specific factor (specified by the user).
The code for doing that is there and there are benefits when unrolling is done  to smaller loops (smaller than the factor specified).

Reviewed By: bondhugula

Differential Revision: https://reviews.llvm.org/D87111
2020-09-08 09:23:38 -07:00
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