[llvm] r200213 - [vectorizer] Teach the loop vectorizer's unroller to only unroll by

[Nadav Rotem]

On Jan 27, 2014, at 3:12 AM, Chandler Carruth <chandlerc at gmail.com> wrote:

> vectorizer] Teach the loop vectorizer's unroller to only unroll by
> powers of two.

Why?   There are cases where unrolling more than twice is better.   Did you discuss this with anyone before committing? 
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