[PATCH] SSE/MMX: Fix problem with highpitched noise on i386

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The "rm" basm constraint doesn't work with my version of gcc (4.5.2),
not even in a simple example. Since we usually only have 5 registers
available on i386, force it to be memory on that architecture.

I've reported an Ubuntu bug on the "rm" constraint issue [1], and it 
seems to apply to a lot of gcc versions. In the meantime I recommend 
this patch to be applied to both master and stable-queue. I've got some 
positive feedback from testing in the Ubuntu community as well.

@Colin, I haven't forgot that there might still be issues if you 
completely silence one channel, it just hasn't been time/priority to 
deal with that yet, feel free to beat me to it if you like :-)

-- 
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic

[1] https://bugs.launchpad.net/ubuntu/+source/gcc-4.5/+bug/789031


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