[Ffmpeg-devel] [PATCH] SSE counterpart of ff_imdct_calc_3dn2

[Luca Barbato]

Rich Felker wrote:

> 
> And I still insist that this statement is fundamentally false. Better
> than what? Whatever code gcc generates with the intrinsics, you can
> always generate the same or better code if you just write it yourself.

I don't know how slow each possible op is for each cpu, gcc should for
most of the documented ones....

> Intrinsics are also gcc4-specific and have the problem that
> performance is subject to the whims (and bugs) of gcc, whose record is
> very bad...

gcc can improve and intrinsics are flexible. Still if someone likes to
write in a way someone else could convert to the other way and vice
versa, isn't it?

lu

-- 

Luca Barbato

Gentoo/linux Gentoo/PPC
http://dev.gentoo.org/~lu_zero