I noticed -fprofile-generate and -fprofile-use dont have an up to date summary
of the options they enable. Patch follows.
Created attachment 9411 [details]
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
I noticed -fprofile-generate does select -funroll-loops but I dont know why it
does (so didnt document it)
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)
> 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.
Created attachment 9414 [details]
As pinskia pointed out, -fspeculative-prefetching is not selected.
Confirmed, please send the patch to gcc-patches@ with a change log.