Re: flow reorg patch

[Jeffrey A Law <law at cygnus dot com>]

  In message <19990125194333.E1456@dot.cygnus.com>you write:
  > Yeah, that was just a quick fix since I've not yet written 
  > insert_insn_on_edge.  Previously I'd been running flow2 after
  > thread_p_e so this hadn't been an issue.  But I'd backed that
  > out so that we wouldn't have quite so many target-specific
  > issues to deal with.
  > 
  > The correct thing to do is to insert those instructions on the
  > edge between ENTRY_BLOCK and block 1, and similarly for the exit.
In the case where they do not make a block unto themselves we can simply
add them to the ENTRY/EXIT blocks.  When the prologue/epilouge make a block
unto themselves it's more complicated since we really need to create one or
more new blocks.

However, I believe that is the exception rather than the rule.  Simply adding
them to the appropriate block should work most of the time.


  > I've not yet incorporated that code.  There are other things I'd like
  > to do wrt EH -- I may have sent that note just to Andrew but I didn't
  > think so -- and I thought I'd take care of that all at once after the
  > bulk of this is delt with.
You need to incorporate it since the newer code is already in egcs.  You'd
take the code a step backwards if you don't incorporate it.

jeff