On 10 Dez, Lawrence Gold wrote:
> First off, let me apologize if this has already been beaten to death on
> the mailing list.
What about searching the list archive instead?
> Anyhow, I recently became aware of the test case bundled with LAME. When
Forget about it, it's only important for LAME developers.
> I build LAME 3.89beta using GCC 3.0.2 and have CFLAGS set to just -O2,
> 'make test' shows 415 bytes' difference. If I build using -O1, I get only
> 20 bytes' difference.
>
> Two questions:
>
> 1) Would there be any noticeable difference in the quality of output
> produced by the O2-compiled LAME vs. the O1-compiled version?
I would be surprised if someone can notice the difference in a listening
test.
> 2) Any ideas what optimization -O2 activates that causes LAME to produce
> different output?
Yes. If you want to know more, get an introduction into floating point
math in modern computer systems (the low level stuff where you learn
something about precision and so on).
Bye,
Alexander.
--
Where do you think you're going today?
http://www.Leidinger.net Alexander @ Leidinger.net
GPG fingerprint = C518 BC70 E67F 143F BE91 3365 79E2 9C60 B006 3FE7
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