Your proposed change to loop.c

[Jeffrey A Law]

  In message < 199908041742.SAA13347@phal.cygnus.co.uk >you write:
  > > ie, precisely why is it necessary to replace find_live_and and find_giv_u
  > ses.
  > 
  > I am talking about replacing find_life_end *with* find_giv_uses, and
  > it is to increase the rebustness of the compiler and the quality of the
  > generated code.
I already know this.  What I am looking for is a *technical* explanation of
the problem.

ie, describe in detail why find_life_end is broken.  Pretend that I think
find_life_end is perfectly fine and explain to me why it is not fine.

  > The fixing of the ix field setting led to infinite loops because it
  > aggravated hte bug with the later index handling.  These two changes
  > must be really done at the same time.
Ok.  So, explain the "bug with the later index handling".

You're still not providing me with any real useful information.

jeff