Fortran: Fix proc pointer as elemental arg handling

The vtab's _callback function calls the elemental 'cb'
  cb (var(:)%comp, comp_types_vtable._callback);
which gets called in a scalarization loop as 'var' might be a
nonscalar. Without the patch, that got translated as:
  D.1234 = &comp_types_vtable._callback
  ...
   cb (&(*D.4060)[S.3 + D.4071], &D.1234);
where 'D.1234' is function_type. With the patch, it remains a pointer;
i.e. D.1234 = comp... and 'cb (..., D.1234)', avoiding ME ICE.

Note: Fortran (F2018, C15100) requires that dummy arguments are
dummy data objects, which rules out dummy procs/proc-pointer dummies,
which is enforced in resolve_fl_procedure.
Thus, this change only affects the internally generated code.

gcc/fortran/ChangeLog:

        * trans-array.c (gfc_scalar_elemental_arg_saved_as_reference):
	Return true for attr.proc_pointer expressions.

gcc/testsuite/ChangeLog:

        * gfortran.dg/finalize_38.f90: Compile with -Ofast.

diff --git a/gcc/fortran/trans-array.c b/gcc/fortran/trans-array.c
index 0d637162509d06045a9314d5cd7b90a7f9dc2f5b..8e5277594ab39878309d5d74fc5a1a2553cc7d3f 100644 (file)
--- a/gcc/fortran/trans-array.c
+++ b/gcc/fortran/trans-array.c
@@ -3025,6 +3025,12 @@ gfc_scalar_elemental_arg_saved_as_reference (gfc_ss_info * ss_info)
       && gfc_expr_is_variable (ss_info->expr))
     return true;
 
+  /* Proc pointers: avoid creating a non-pointer function temporary;
+     should only get used internally due to constraints. */
+  if (!ss_info->data.scalar.needs_temporary &&
+      gfc_expr_attr (ss_info->expr).proc_pointer)
+    return true;
+
   /* Otherwise the expression is evaluated to a temporary variable before the
      scalarization loop.  */
   return false;

diff --git a/gcc/testsuite/gfortran.dg/finalize_38.f90 b/gcc/testsuite/gfortran.dg/finalize_38.f90
index 442e175331109f205dff8d3c5993ac5ed3527ea3..99c288784d64d2c0e029d224bd57624054cddc63 100644 (file)
--- a/gcc/testsuite/gfortran.dg/finalize_38.f90
+++ b/gcc/testsuite/gfortran.dg/finalize_38.f90
@@ -1,4 +1,5 @@
 ! { dg-do compile }
+! { dg-additional-options "-Ofast" }
 !
 ! Check finalization
 !