I'd like to be able to specify registers that are safe across function calls
(without the need to save/restore) and I cannot figure out how to do this.
I know that I can set these particular registers to '0' in
CALL_USED_REGISTERS and then remove the call/restore in the
prologue/epilogue, but the stack space is still reserved for the
save/restore. I would like to just rely on the fact that these registers
are safe across function calls and not reserve any stack space for them.
Thanks in advance.
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