Re: PATCH][RFC][resend] CC_OPTIMIZE_FOR_SIZE should default to N
From: Andi Kleen
Date: Wed Mar 23 2011 - 13:47:27 EST
Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> writes:
> On Tue, Mar 22, 2011 at 3:27 AM, Ingo Molnar <mingo@xxxxxxx> wrote:
>> If that situation has changed - if GCC has regressed in this area then a commit
>> changing the default IMHO gains a lot of credibility if it is backed by careful
>> measurements using perf stat --repeat or similar tools.
> Also, please don't back up any numbers for the "-O2 is faster than
> -Os" case with some benchmark that is hot in the caches.
Haven't done it recently, but some time last year -O2 vs -Os
made a measurable difference in large OLTP benchmarks.
(-Os being worse of course -- friends don't let friends use -Os)
ak@xxxxxxxxxxxxxxx -- Speaking for myself only
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