re PR fortran/60392 (Problem with TRANSPOSE and CONTIGUOUS dummy arguments)

fortran/
        PR fortran/60392
        * trans-array.c (gfc_conv_array_parameter): Don't reuse the descriptor
        if it has transposed dimensions.

testsuite/
        PR fortran/60392
        * gfortran.dg/transpose_4.f90: New test.

From-SVN: r208581

gcc/fortran/ChangeLog

+2014-03-14  Mikael Morin  <mikael@gcc.gnu.org>
+
+	PR fortran/60392
+	* trans-array.c (gfc_conv_array_parameter): Don't reuse the descriptor
+	if it has transposed dimensions.
+
 2014-03-08  Tobias Burnus  <burnus@net-b.de>
 
 	PR fortran/60447

gcc/fortran/trans-array.c

@@ -7227,7 +7227,50 @@ gfc_conv_array_parameter (gfc_se * se, gfc_expr * expr, bool g77,
       else
 	{
 	  tmp = build_fold_indirect_ref_loc (input_location, desc);
-	  gfc_conv_descriptor_data_set (&se->pre, tmp, ptr);
+
+	  gfc_ss * ss = gfc_walk_expr (expr);
+	  if (!transposed_dims (ss))
+	    gfc_conv_descriptor_data_set (&se->pre, tmp, ptr);
+	  else
+	    {
+	      tree old_field, new_field;
+
+	      /* The original descriptor has transposed dims so we can't reuse
+		 it directly; we have to create a new one.  */
+	      tree old_desc = tmp;
+	      tree new_desc = gfc_create_var (TREE_TYPE (old_desc), "arg_desc");
+
+	      old_field = gfc_conv_descriptor_dtype (old_desc);
+	      new_field = gfc_conv_descriptor_dtype (new_desc);
+	      gfc_add_modify (&se->pre, new_field, old_field);
+
+	      old_field = gfc_conv_descriptor_offset (old_desc);
+	      new_field = gfc_conv_descriptor_offset (new_desc);
+	      gfc_add_modify (&se->pre, new_field, old_field);
+
+	      for (int i = 0; i < expr->rank; i++)
+		{
+		  old_field = gfc_conv_descriptor_dimension (old_desc,
+			gfc_rank_cst[get_array_ref_dim_for_loop_dim (ss, i)]);
+		  new_field = gfc_conv_descriptor_dimension (new_desc,
+			gfc_rank_cst[i]);
+		  gfc_add_modify (&se->pre, new_field, old_field);
+		}
+
+	      if (gfc_option.coarray == GFC_FCOARRAY_LIB
+		  && GFC_DESCRIPTOR_TYPE_P (TREE_TYPE (old_desc))
+		  && GFC_TYPE_ARRAY_AKIND (TREE_TYPE (old_desc))
+		     == GFC_ARRAY_ALLOCATABLE)
+		{
+		  old_field = gfc_conv_descriptor_token (old_desc);
+		  new_field = gfc_conv_descriptor_token (new_desc);
+		  gfc_add_modify (&se->pre, new_field, old_field);
+		}
+
+	      gfc_conv_descriptor_data_set (&se->pre, new_desc, ptr);
+	      se->expr = gfc_build_addr_expr (NULL_TREE, new_desc);
+	    }
+	  gfc_free_ss (ss);
 	}
 
       if (gfc_option.rtcheck & GFC_RTCHECK_ARRAY_TEMPS)

gcc/testsuite/ChangeLog

+2014-03-14  Mikael Morin  <mikael@gcc.gnu.org>
+
+	PR fortran/60392
+	* gfortran.dg/transpose_4.f90: New test.
+
 2014-03-14  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR rtl-optimization/60508

gcc/testsuite/gfortran.dg/transpose_4.f90

+! { dg-do run }
+!
+! PR fortran/60392
+! In the transposed case call to my_mul_cont, the compiler used to (wrongly)
+! reuse a transposed descriptor for an array that was not transposed as a result
+! of packing.
+!
+! Original test case from Alexander Vogt <a.vogt@fulguritus.com>.
+
+program test
+  implicit none
+
+  integer, dimension(2,2) :: A, R, RT
+  integer, dimension(2,2) :: B1, B2
+
+  ! 
+  ! A = [  2   17 ]
+  !     [ 82  257 ]
+  !
+  ! matmul(a,a) = [  1398   4403 ]
+  !               [ 21238  67443 ]
+  !
+  ! matmul(transpose(a), a) = [  6728  21108 ]
+  !                           [ 21108  66338 ]
+  A(1,1) =   2
+  A(1,2) =  17
+  A(2,1) =  82
+  A(2,2) = 257
+
+  R(1,1) =  1398
+  R(1,2) =  4403
+  R(2,1) = 21238
+  R(2,2) = 67443
+  
+  RT(1,1) =  6728
+  RT(1,2) = 21108
+  RT(2,1) = 21108
+  RT(2,2) = 66338
+
+  ! Normal argument
+  B1 = 0
+  B2 = 0
+  B1 = my_mul(A,A)
+  B2 = my_mul_cont(A,A)
+! print *,'Normal:    ',maxval(abs(B1-B2))
+! print *,B1
+! print *,B2
+  if (any(B1 /= R)) call abort
+  if (any(B2 /= R)) call abort
+
+  ! Transposed argument
+  B1 = 0
+  B2 = 0
+  B1 = my_mul(transpose(A),A)
+  B2 = my_mul_cont(transpose(A),A)
+! print *,'Transposed:',maxval(abs(B1-B2))
+! print *,B1
+! print *,B2
+  if (any(B1 /= RT)) call abort
+  if (any(B2 /= RT)) call abort
+
+contains
+
+  function my_mul(A,C) result (B)
+    use, intrinsic :: ISO_Fortran_env
+    integer, intent(in) :: A(2,2), C(2,2)
+    integer :: B(2,2)
+    B = matmul(A, C)
+  end function
+
+  function my_mul_cont(A,C) result (B)
+    use, intrinsic :: ISO_Fortran_env
+    integer, intent(in), contiguous :: A(:,:), C(:,:)
+    integer :: B(2,2)
+    B = matmul(A, C)
+  end function
+
+end program