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SubjectRe: [2.6 patch] add a config option for -Os compilation
>> Martin was ironically talking about people who are ignorant of machines
>> with _huge_ caches.
>>
>
> Oh. Sorry. Probably I need to work on my English bit more.
>
>> I the context of this thread he wanted to vote for making -Os
>> conditionally and not unconditionally enabled by telling that he knows
>> of situations where -O2 produces faster code.
>
> Absolutely.
> High-end toys, after all, optimized to handle this.
>
> IMHO this should be settled on per-target basis: embedded system - -Os; servers - -O2; desktops - -O3 ;) So instead of CONFIG_EMBEDDED better to have CONFIG_TARGET=[desktop|server|embedded].
>
> Inroducing one more variable into builds - is really painful. I was hit by gcc miscompiles and internal errors not once (especially with -O[23]). Tracking down this kind of issues would be made more problematic.
>
> P.S. I'm really sorry for my rude response.

;-) No problem.

But if someone with a small cache would actually *measure* the damned
thing, I'd be more impressed ... I've never seen that, but perhaps
I just missed it.

Point is the same either way though ... we shouldn't unconditionally
optimise for *anyone's* system. If it's faster on all systems that anyone
can be bothered to measure, great. If it's faster on some, and slower on
others, a config option seems more appropriate, defaulting to the majority
of users.

M.

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