Endian problem when accessing internel regs on 8347

[Bruce_Leonard at selinc.com]

> > __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