-freg-struct-return?

From: Jeremy Fitzhardinge
Date: Wed Feb 21 2007 - 20:30:48 EST


We have a number of functions which return small structures (such as
pte_t). It seems that the kernel is not compiled with
-freg-struct-return, so all these small structures are being returned
via the stack, even though they would fit into registers.

Is there a reason for this? Would -freg-struct-return be preferred? It
would make a good compliment to -mregparm.

J
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