[PATCH] Unrolling improvements (target indep. and for x86)

[Nadav Rotem]

On Feb 21, 2014, at 11:19 PM, Hal Finkel <hfinkel at anl.gov> wrote:

> Currently, the vectorizer unrolls only for ILP (or latency hiding), subject to the register pressure estimate, and having it also unroll for size would be a change to the current behavior. Is that your desire?

The loop vectorizer also has a basic size threshold to prevent cases where the loop body is too big to fit in the uOp cache.  
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