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Re: redirect_edge_and_branch questions
On Fri, 2004-10-01 at 17:49, Zdenek Dvorak wrote:
> Hello,
>
> > Perhaps it would make sense to have function that takes list of
> > incomming edges to given basic block and create empty basic block before
> > redirecting the selected edges into it. This operatinon should be
> > usefull at least for creating loop preheaders.
>
> and its name is "make_forwarder_block" :-)
>
What do I have to do with the parameter
void (*new_bb_cbk) (basic_block))
? Its not documented, and I see where it is used in cfg_loop.c calls
"update_latch" which allocated aux entries, sets a dominator, etc. What
am I suppose to do in there? Can I do nothing or is there a minimum I
must do?
It looks like I don't have to even provide that routine since NULL is
always returned by tree_redirect_edge_branch_and_force(). Is this true?
Andrew