--- Comment #29 from Wilco <wilco at gcc dot> ---
(In reply to Jiu Fu Guo from comment #28)
> For these kind of small loops, it would be acceptable to unroll in GIMPLE,
> because register pressure and instruction cost may not be major concerns;
> just  like "cunroll" and "cunrolli" passes (complete unroll) which also been
> done at O2.

Absolutely, unrolling is a high-level optimization like vectorization. Note the
existing unroller doesn't care about register pressure or costs, but a
high-level unroller can certainly take this into account by not unrolling as
aggressively like the existing unroller.

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