Hi all,
I have a question on general purpose registers(GPRs). According to
architecture manual, the openrisc can be implemented with sixteen or
thirty-two 32/64 bit general purpose register. My question is how the
gnu complier knows the architecture with 16 or 32 GPRs? I mean if there
are any options in compiler indicate how many GPRs there are in the
target device?

Thank you very much.

Stepen

the number of target registers is (in priciple) a parameter to compiler.
to compile some c code for target with 16 GPRs one should define
GPRs 16-31 fixed. (for example like -ffixed-r2 is used in linux
to store the 'current' pointer)

regards,
p.