[Ffmpeg-devel] gcc4 support & MMX fixups (from Debian)
Wed Feb 1 00:21:56 CET 2006
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
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