Re: genesi and open rd
2010/2/8 Martin Guy <email@example.com>:
> On 2/8/10, Bill Gatliff <firstname.lastname@example.org> wrote:
>> OT, but has anyone looked at what gains can be had by rebuilding
>> packages with, say, A8 or other optimizations for processors that
>> support them?
> Well, it has a VFP FPU, so floating point apps will run N times
> faster, and GCC optimizes some kinds of integer loops into SIMD
> instructions for the NEON, beside the different instruction timing
> info and pipeline description for better instruction scheduling.
> The easiest way to try this is to make fake versions of gcc and put
> them at the start of the PATH:
> mkdir ~/cortex
> cat > ~/cortex/gcc << EOF
> #! /bin/sh
> exec gcc-4.3-crunch -mcpu=cortex-a8 -mfpu=vfp -mfloat-abi=softfp "$@"
> chmod 755 ~/cortex/gcc
> ln -s gcc ~/cortex/cc
> ln -s gcc ~/cortex/gcc-4.3
> ln -s gcc ~/cortex/arm-linux-gnueabi-gcc
Indeed, this might be a nice to have in a future gcc-cross-defaults package. :-)
> and fool the build system into using them
> PATH=~/cortex:$PATH dpkg-buildpackage -rfakeroot -B
> I'd be interested to know what difference it makes to non-FP applications
I believe you would not mind to be quoted at debian wiki page.
Feel free to remove or edit whatever you feel.
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