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

Luca Barbato lu_zero
Thu Aug 24 06:39:52 CEST 2006

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?



Luca Barbato

Gentoo/linux Gentoo/PPC

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