[Ffmpeg-devel] gcc4 support & MMX fixups (from Debian)

[Paweł Sikora]

Dnia Wednesday, 1 of February 2006 00:01, Aurelien Jacobs napisa?:

> > orig:  iters = 1000000000, dt = 7.92 [avg]
> > fixed: iters = 1000000000, dt = 7.35 [avg]
> >
> > we gain: ~7.2%
>
> That sounds interesting, but here, with gcc-4.0.2 on amd64, I have some
> rather different results :
>
> orig:  iters = 1000000000, dt = 12.16
> fixed: iters = 1000000000, dt = 173.86
>
> So it seems that gcc-4.1 gives some spectacular improvements in this area,
> but this code really shouldn't be enabled with gcc-4.0.

I would like to see the asm. dump of 4.0.2 output.
It seems to be a gcc-bug.

-- 
to_be || !to_be == 1, to_be | ~to_be == -1