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register allocation

Hi
   My question was abt how register allocation affected induction
variables. My question is based on what I found with even small
programs with the induction variables declared as globals. The induction
variable value seemed to be always loaded from
memory. This was with a gcc cross compiler for MCORE. So is there any
thing in the register allocation which prevents them being allocated
into registers ? If so, is there any literature/work in progress on the
optimizations which can do a better register allocation.

The problem repeated even when I made them local variables.

regards
sumesh

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