[Bug middle-end/33290] New: [4.3 Regression] gcc.c-torture/execute/930921-1.c fails at -O1 and above now

["pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

+++ This bug was initially created as a clone of Bug #33283 +++

[18:22] < apinski> 
/home/apinski/src/local/gcc/gcc/testsuite/gcc.c-torture/execute/930921-1.c:5:
error: could not split insn^M
[18:22] < apinski> new failure
[18:23] < apinski> on ppc-linux-gnu
[18:23] < apinski> between 127935 and 128000

[18:32] < Rhyolite> I guess it could be due to my predicate change
[18:33] < apinski> this was after that
[18:33] < Rhyolite> okay, phew
[18:33] < apinski> paired support was inbetween that though
[18:33] < Rhyolite> sigh
[18:34] < Rhyolite> Revital said that she regression tested
[18:34] < apinski> but also Sandra's regclass changes
[18:34] < apinski> and some optabs changes
[18:34] < apinski> so it could be either of those three

And then from PR 33277 #3:
Fromp http://gcc.gnu.org/ml/gcc-testresults/, looking at the results from
"regress", it can be narrowed between 127961 (working) and 127997 (non
working).  Note that the last change of final.c is 127941 (outside the range). 
>From an uneducated guess, I'l say 127989, but I may be completely wrong.

And from #4:
>From looking closer to the changes, the scheduler changes is not
likely because this happens at -O1 :)  I am more thinking it was:
2007-08-31  Richard Sandiford  <richard@codesourcery.com>

Which changed optabs which is part of the expansion.  The IV change
could not have cause this issue as there is no loop in that function
so the last change would be the optabs change.

Note I am going to start cloning this bug until all the offtopic stuff stops
being added.


-- 
           Summary: [4.3 Regression] gcc.c-torture/execute/930921-1.c fails
                    at -O1 and above now
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Keywords: ice-on-valid-code
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: pinskia at gcc dot gnu dot org
GCC target triplet: powerpc-*-* (32bits)


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33290