[Bug middle-end/45705] New: [4.3/4.4/4.5/4.6 Regression] Useless store not optimized away

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

int x;

void
foo (void)
{
  if (x == 0)
    x = 0;
}

was optimized into empty routine with gcc 3.4 and 4.0, but isn't any longer in
4.1+.  In 4.0 apparently the store went away in *.optimized, and with
-fno-tree-ter in ce1+combine removed it.  This occurs quite a lot in
http://embed.cs.utah.edu/embarrassing/


-- 
           Summary: [4.3/4.4/4.5/4.6 Regression] Useless store not optimized
                    away
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: middle-end
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jakub at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45705