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From: "burnus at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/53732] [4.7/4.8 Regression] "mismatching comparison operand types" on compile
Date: Wed, 20 Jun 2012 16:40:00 -0000
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X-Bugzilla-Keywords: ice-on-valid-code, wrong-code
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53732

Tobias Burnus <burnus at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |ice-on-valid-code,
                   |                            |wrong-code
                 CC|                            |burnus at gcc dot gnu.org
   Target Milestone|---                         |4.7.2

--- Comment #2 from Tobias Burnus <burnus at gcc dot gnu.org> 2012-06-20 16:40:05 UTC ---
The problem is the following code in trans-array.c's gfc_add_loop_ss_code:

      switch (ss_info->type)
        {
        case GFC_SS_SCALAR:
...
          gfc_conv_expr (&se, expr);

Here, expr is "0.0d0", which is properly converted. However:

          if (expr->ts.type != BT_CHARACTER)
            {
              /* Move the evaluation of scalar expressions outside the
                 scalarization loop, except for WHERE assignments.  */
              if (subscript)
                se.expr = convert(gfc_array_index_type, se.expr);

As subscript is true, the "0.0d0" gets converted to the integer "0".