Re: -Os versus -O2

Rene Herman
2007-06-25T01:35:06Z

On 06/25/2007 03:23 AM, Rene Herman wrote:

> On 06/25/2007 02:41 AM, Adrian Bunk wrote:
>
>> The interesting questions are:
>> Does -Os still sometimes generate faster code with gcc 4.2?
>> If yes, why?
>
> I would wager that the CPU type makes more of a difference than the
> compiler version. That is, I'd expect my Duron with it's "puny" 64K L1
> to have a very different profile than it's Athlon brother with 256K L1.

Sorry, that should've been L2. And "its" ...

> Not to mention CPUs with as little as 8K L1 (P1).
>
> I can't quote numbers -- it's a bit hard to test those things anyway as
> it's a system-global effect and not su much that's easily isolated in a
> dedicated benchmark.

And while I'm at it, "and not so much one that's [ ...]".

Rene.