[polly] r256199 - Add option to assume single-loop scops with sufficient compute are profitable

[Tobias Grosser via llvm-commits]

On 12/22/2015 12:09 PM, Johannes Doerfert wrote:
> In this spirit I would like to change the default heuristic to:
>    #loops + #blocks > 2
> as that is the condition under which we can perform "by default enabled"
> optimizations.

If this results in run-time benefits for at least one application we 
care about and no run-time regressions, then I think this is fine.

(I care a little less about compile-time regressions. The more we expose 
them, the more visible they become and the more likely we are
to add improvements here).

Best,
Tobias