Re: block merging

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

  In message <u9d7vdbnyd.fsf@yorick.cygnus.com>you write:
  > >>>>> Jeffrey A Law <law@cygnus.com> writes:
  > 
  >  > ! 	  For now we avoid the EH issues by not allowing any physical
  >  > ! 	  block movement when exception handling is enabled.  */
  >  > !       if (flag_exceptions)
  >  > ! 	return 0;
  > 
  > Please don't do this.  If you don't want to take the time to make various
  > optimizations work in the presence of EH, at least allow them to be done in
  > functions with no EH regions.
I've wanted to do this, but I simply don't have the time and I'm unlikely to
have the time in the future.   The code has been basically sitting here for a
year, and I don't want to see it continue to languish because I don't have the
time to make it EH safe.

IMHO, this is one of the cases where putting the code out is the right thing
to do.  We derive some benefit from the optimization and hopefully someone
with the interest and time will take up the task of extending it to handle
more cases.

jeff