Sibcall fallback

[Paulo J. Matos]

Hi all,

I am trying to implement sibcall optimization for a specific arch in
4.3.4. However, this is only important for me to do if it maintains or
decreases code size.
I need to know the live registers, frame size, etc. Is this
information available at TARGET_FUNCTION_OK_FOR_SIBCALL or should this
hook be mainly used to decide to do sibcall based on analysis of the
tree?

On the other hand I thought I could try to accept sibcall most of the
times through TARGET_FUNCTION_OK_FOR_SIBCALL and then on the expand of
sibcall_epilogue I would fallback to a normal leave if I decide that
sibcall is not worth it. Is this possible?

If it is, how can I emit  a 'normal leave' from sibcall_epilogue?

Cheers,
-- 
Paulo Jorge Matos - pocmatos at gmail.com
http://www.pmatos.net