[Bug middle-end/23197] Improve documentation on -fprofile-generate, -fprofile-use

[pinskia at physics dot uc dot edu]

------- Additional Comments From pinskia at physics dot uc dot edu  2005-08-02 14:32 -------
Subject: Re:  Improve documentation on -fprofile-generate, -fprofile-use


On Aug 2, 2005, at 10:25 AM, anton at samba dot org wrote:

>
> ------- Additional Comments From anton at samba dot org  2005-08-02 
> 14:25 -------
> Created an attachment (id=9411)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=9411&action=view)
>  --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=9411&action=view)
> Update profile option documentation
>
> Document all options that -fprofile-generate/-fprofile-usr select:
>
> -fprofile-generate selects -fspeculative-prefetching
> -fprofile-use selects -fprofile-values and -fspeculative-prefetching

No use/generate does not select -fspeculative-prefetching.  The code to
select it was disabled.


> I noticed -fprofile-generate does select -funroll-loops but I dont 
> know why it
> does (so didnt document it)

The reason why it turns on -funroll-loops is because unrolling happens
before profiling is done.  Though that was only true in 4.0.x.

-- Pinski



-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23197