Store scheduling with DFA scheduler

[Jon Beniston]

> Jon,
> > (define_insn_reservation "arith" 1 (eq_attr "type" "arith") "x") 
> > (define_insn_reservation "loads" 2 (eq_attr "type" "load") "x,m") 
> > (define_insn_reservation "stores" 3 (eq_attr "type" 
> "store") "x,m*2")
> 
> Stores don't really have a 'result', why have you set the 
> cycle count to 3?  Shouldn't it be '1'? (then you won't need 
> store bypasses for autoincrements)

Primilary because that's how it appears to be coded in the ARM port (e.g
store_wbuf in arm-generic.md). I had tried both ways though, and for this
particular problem, changing this value appears to have no effect. I can see
that it would for autoinc though.

Cheers,
Jon