> > __asm__ __volatile__("lwz%U1%X1 %0,%1; twi 0,%0,0; isync" : "=r" (ret)
:
> > "m" (*addr));
>
> They allow the compiler to use update and/or index mode for the memory
> operand.
Well that makes sense, U for update and X for index, but I'm not sure
they're applicable to this particular instruction and I'm not sure that
the memory operand makes sense for PowerPC. However, before I post
anything that makes me look like I've got hoof-n-mouth disease I'm going
to do some more digging. Is the GCC manual the only "official"
documentation on this (I've found a couple of web sites but none of them
gun.org) or is there another manual I should be looking for?
Thanks for the pointers.
Bruce
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