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Date: Tue, 4 Mar 2008 21:32:48 +0100
From: Stanislav Brabec <utx@penguin.cz>
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Subject: Re: iwwmmxt optimization and soft float in OE on PXA270
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Stanislav Brabec wrote:

> Khem Raj wrote: 
> > What ABI breakage are you seeing ?
> > Aren't you using EABI ?
I have verified, that gcc(1) does not tell true, and I see no breakage
while mixing these two environments (library from one x binary from
second one).

It allows me to do small benchmarks - compare default image with
optimized iwmmxt image.

I see about 13% performance improvement. I don't yet know why.

previous (mid-February) oe.dev image in chroot, compiled with defaults:
armv5, only mplayer for iwmmxt, softfp floats, reusing original kernel
and X:
2nd run:
real	0m26.696s
user	0m7.700s
sys	0m1.030s
3rd run:
real	0m26.611s
user	0m7.570s
sys	0m0.880s

playing video, everything compiled for iwmmxt with -msoft-float and
higher optimization options:
2nd run:
real	0m25.990s
user	0m6.840s
sys	0m0.830s
3rd run:
real	0m25.964s
user	0m6.700s
sys	0m0.760s

-- 
Stanislav Brabec
http://www.penguin.cz/~utx/zaurus