lkml.org 
[lkml]   [2002]   [May]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Compiling 2.2.19 with -O3 flag
In article <1022253543.962.236.camel@sinai> you wrote:
> On Fri, 2002-05-24 at 07:42, Alan Cox wrote:

>> Bench it and see. From my own experience -O3 made the kernel a lot larger
>> and reduced overall performance - in part because the kernel already
>> explicitly figures out what it wants inlined.
>>
>> Interestingly enough -Os outperformed -O2

> Heh, now that is interesting.

Not really, -Os implies -O2, cf gcc/toplev.c:

if ((p[0] == 's') && (p[1] == 0))
{
optimize_size = 1;

/* Optimizing for size forces optimize to be 2. */
optimize = 2;
}

CIao, Marcus
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:26    [W:0.085 / U:1.280 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site