register reload problem in global register allocation

[wonsubkim]

I have some problems in global register allocation phase.

I have described some simple architecture using machine description and target 
macro file. I use gnu GCC version 4.1.1.

But, "can't combine" message is printed out in *.c.37.greg file in global 
register allocation phase. After i have traced the error message, i have 
found out the message reload_as_needed. But, I do not recognize the reason 
about this problem. I really can't know the relationship between register 
reload and my description.