On Thu, Oct 4, 2012 at 2:18 PM, Eric Botcazou <ebotca...@adacore.com> wrote: >> Any suggestion about how I could avoid generating this zero_extension? > > Redundant extensions have been a hot topic for some time. The combiner should > catch the local easy cases, we have ree.c for the nonlocal easy cases and Tom > recently posted: > http://gcc.gnu.org/ml/gcc-patches/2012-07/msg00408.html > which should catch more complex cases. > > I guess someone should gather the various missed optimization cases, draw a > global picture of the situation and see how the various approaches could be > fitted together.
Kenny already did that as part of the thread with Tom. Tom's patch also is incomplete. - David
