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About VMX/Altivec support in Debian ppc64 port

Hi, List, 

I'm working to run Debian ppc64 ports on my xbox360 box, but 
failed to setup a chrooted environment with "Illegal instruction"
error. After some dig on this problem, I found this is caused
by PowerPC vector instrunctions, and according to the build
log[1], the package do compile with " -maltivec -mabi=altivec ".

So I want know, why we use "-maltivec" in PPC64 ports, is
it faster then altivec disabled? After all, many old Power4/5,
and qemu ppc64 simulator don't support altivec. 

According Debian ppc64 wiki page[2], xenon, the cpu used by 
xbox360, supports altivec, but altivec don't work in my box,
I think it is another bug or misconfigure. 

I'm not a subscriber of this list, please CC me. 

[1] http://buildd.debian-ports.org/status/fetch.php?pkg=util-linux&arch=ppc64&ver=2.20.1-5.3&stamp=1355261928
[2] http://wiki.debian.org/PPC64

Thanks and Regards,
Liang Guo

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