[Bug c/14261] New: Compilation failure due to if-conversion

["sje at cup dot hp dot com" <gcc-bugzilla at gcc dot gnu dot org>]

The attached program will not compile with -O2 on IA64 linux.  If you turn off
if-conversion it will compile. See
http://gcc.gnu.org/ml/gcc/2004-02/msg01115.html for some analysis from Jim
Wilson.  This was tested with the ToT sources dated 
20040212 and also exists on older GCC compilers for IA64 Linux.

typedef union YYSTYPE {
    double dval;
    int intval;
} YYSTYPE;

YYSTYPE *x;

int
knparse (void)
{
  YYSTYPE yyvsa[200];
  register YYSTYPE *yyvsp;
  YYSTYPE yyval, *x;
  yyvsp = &yyvsa[100];
  if (yyvsp[3].intval > yyvsp[0].intval)
     yyval.intval = yyvsp[3].intval;
  else
     yyval.intval = yyvsp[0].intval;
  *x = yyval;
}

-- 
           Summary: Compilation failure due to if-conversion
           Product: gcc
           Version: 3.5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: sje at cup dot hp dot com
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=14261