Re: Turn on -funroll-loops at -O3?

[Andi Kleen]

"H.J. Lu" <hjl.to...@gmail.com> writes:

> Hi,
>
> SInce -O3 turns on vectorizer, should it also turn on
> -funroll-loops?

In my experience gcc already unrolls very aggressively at -O3,
due to the vector unroller which is enabled by default.

-Andi