How to teach gcc, that registers are clobbered by api calls?

[Ross Ridge]

Kai Tietz writes:
>I read that too, but how can I teach gcc to do this that registers are
>callee-saved? I tried it by use of call_used part in regclass.c, but
>this didn't worked as expected.

I think you need to modify CALL_USED_REGISTERS and/or
CONDITIONAL_REGISTER_USAGE in i386.h.  Making any changes to regclass.c
is probably not the right thing to do.

					Ross Ridge