In http://gcc.gnu.org/ml/gcc/2006-06/msg00549.html, you wrote:

-ftree-live-range-split  splits live ranges on exit from ssa.  This is
on by default, and in fact it is more work to NOT split unrelated live
ranges, and creates extra register pressure.

I've found that in 4.1, -fno-web is often needed in order to generate 
auto-increment addressing.
I suppose that will be similar for any live range splitting that happens before 
flow.


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