Hi,
I am working on a new target, and would like to save the caller-saved regs at
the call-site.
I have used the ADJCALLSTACKDOWN / UP pseudo-instructions, and my idea was to
eliminate these, and in doing this using the RegScavenger to find the
caller-saved live regs, and the push / pop these.
I find that there are no such regs actually live there. It seems that these
registers are somehow COPY:d and not coalesced, and thus not live across the
call.
Is this correct? How does this work? It looked like there was a method in
PrologueEpilogueInserter for these regs before, but it has been removed. Please
explain.
Thanks,
Jonas
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