On 12/07/11 22:17, Tom Evans wrote:
On Wed, Dec 7, 2011 at 11:47 AM, Da Rock
<freebsd-hack...@herveybayaustralia.com.au> wrote:
I really hate sounding like an idiot, but if I don't ask I'll never know:
The assembler in base is not up-to-date with the latest instruction sets for
the cpu, and is causing an error because its telling the cpu to do something
it doesn't understand and is going WTF! So the port binutils provides the
latest instruction sets for the latest cpus. And ffmpeg and friends use the
latest cpu abilities to run as fast as they do? Right or way off? Otherwise
I'd have problems building anything, wouldn't I?
The way I understand it is that they use compiler/assembler features
that did not exist in the version of binutils that is in base.
That might be related to CPU features - I know you need binutils from
ports to use SSE3 features, for example - but whether that is what
happens here, or whether it is due to ffmpeg using newer features
would have to be answered by someone who understands what is going on!
Ok, that did just answer it. For starters SSE3 is used in
ffmpeg/mplayer, but there would be more (3DNOW, etc). So that explains
it... interesting study. I'll have a closer look at the docs on binutils
to find out more.
Cheers
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