Confusing description of GCC option `-freorder-blocks'

[Kyrill Tkachov]

On 01/12/14 08:20, Pengfei Yuan wrote:
> Hi,
Hi,

>
> In https://gcc.gnu.org/onlinedocs/gcc/Optimize-Options.html , the
> description of option `-freorder-blocks' says `in order to reduce
> number of taken branches and improve code locality'. It is confusing.
> When will the `and' condition happen? That is, taken branches reduced
> AND code locality improved.

I would think that one implies the other. If you reorder the blocks
so as to reduce taken branches, that is by definition an improvement of
code locality since you don't jump all over the place as much.

Cheers,
Kyrill

>
> Thanks!
>
> YUAN, Pengfei
>