intrinsic.c (add_functions): New internal intrinsic function GFC_PREFIX ("stride").

2013-01-04  Tobias Burnus  <burnus@net-b.de>

        * intrinsic.c (add_functions): New internal intrinsic
        function GFC_PREFIX ("stride").
        * gfortran.h (gfc_isym_id): Add GFC_ISYM_STRIDE.
        * intrinsic.h (gfc_resolve_stride): New prototypes.
        * iresolve.c (gfc_resolve_stride): New function.
        * trans-intrinsic.c (conv_intrinsic_stride): New static
        function.
        (gfc_conv_intrinsic_function): Use it.

From-SVN: r194918

gcc/fortran/ChangeLog

 2013-01-04  Tobias Burnus  <burnus@net-b.de>
 
+	* intrinsic.c (add_functions): New internal intrinsic
+	function GFC_PREFIX ("stride").
+	* gfortran.h (gfc_isym_id): Add GFC_ISYM_STRIDE.
+	* intrinsic.h (gfc_resolve_stride): New prototypes.
+	* iresolve.c (gfc_resolve_stride): New function.
+	* trans-intrinsic.c (conv_intrinsic_stride): New static
+	function.
+	(gfc_conv_intrinsic_function): Use it.
+
+2013-01-04  Tobias Burnus  <burnus@net-b.de>
+
 	* class.c (gfc_find_intrinsic_vtab): Add _final
 	component.
+	* decl.c (gfc_match_null): Remove superfluous
+	variadic argument to gfc_match.
 
 2013-01-04  Paul Thomas  <pault@gcc.gnu.org>
 

gcc/fortran/gfortran.h

@@ -521,6 +521,7 @@ enum gfc_isym_id
   GFC_ISYM_SR_KIND,
   GFC_ISYM_STAT,
   GFC_ISYM_STORAGE_SIZE,
+  GFC_ISYM_STRIDE,
   GFC_ISYM_SUM,
   GFC_ISYM_SYMLINK,
   GFC_ISYM_SYMLNK,

gcc/fortran/intrinsic.c

@@ -2640,6 +2640,14 @@ add_functions (void)
 
   make_generic ("size", GFC_ISYM_SIZE, GFC_STD_F95);
 
+  /* Obtain the stride for a given dimensions; to be used only internally.
+     "make_from_module" makes inaccessible for external users.  */
+  add_sym_2 (GFC_PREFIX ("stride"), GFC_ISYM_STRIDE, CLASS_INQUIRY, ACTUAL_NO,
+	     BT_INTEGER, gfc_index_integer_kind, GFC_STD_GNU,
+	     NULL, NULL, gfc_resolve_stride,
+	     ar, BT_REAL, dr, REQUIRED, dm, BT_INTEGER, ii, OPTIONAL);
+  make_from_module();
+
   add_sym_1 ("sizeof", GFC_ISYM_SIZEOF, CLASS_IMPURE, ACTUAL_NO, BT_INTEGER, ii,
 	     GFC_STD_GNU, gfc_check_sizeof, NULL, NULL,
 	     x, BT_UNKNOWN, 0, REQUIRED);

gcc/fortran/intrinsic.h

@@ -546,6 +546,7 @@ void gfc_resolve_signal (gfc_expr *, gfc_expr *, gfc_expr *);
 void gfc_resolve_sin (gfc_expr *, gfc_expr *);
 void gfc_resolve_sinh (gfc_expr *, gfc_expr *);
 void gfc_resolve_size (gfc_expr *, gfc_expr *, gfc_expr *, gfc_expr *);
+void gfc_resolve_stride (gfc_expr *, gfc_expr *, gfc_expr *);
 void gfc_resolve_spacing (gfc_expr *, gfc_expr *);
 void gfc_resolve_spread (gfc_expr *, gfc_expr *, gfc_expr *, gfc_expr *);
 void gfc_resolve_sqrt (gfc_expr *, gfc_expr *);

gcc/fortran/iresolve.c

@@ -2314,6 +2314,15 @@ gfc_resolve_size (gfc_expr *f, gfc_expr *array ATTRIBUTE_UNUSED,
 
 
 void
+gfc_resolve_stride (gfc_expr *f, gfc_expr *array ATTRIBUTE_UNUSED,
+		  gfc_expr *dim ATTRIBUTE_UNUSED)
+{
+  f->ts.type = BT_INTEGER;
+  f->ts.kind = gfc_index_integer_kind;
+}
+
+
+void
 gfc_resolve_spacing (gfc_expr *f, gfc_expr *x)
 {
   f->ts = x->ts;

gcc/fortran/trans-intrinsic.c

@@ -1657,6 +1657,35 @@ conv_intrinsic_cobound (gfc_se * se, gfc_expr * expr)
 
 
 static void
+conv_intrinsic_stride (gfc_se * se, gfc_expr * expr)
+{
+  gfc_actual_arglist *array_arg;
+  gfc_actual_arglist *dim_arg;
+  gfc_se argse;
+  tree desc, tmp;
+
+  array_arg = expr->value.function.actual;
+  dim_arg = array_arg->next;
+
+  gcc_assert (array_arg->expr->expr_type == EXPR_VARIABLE);
+
+  gfc_init_se (&argse, NULL);
+  gfc_conv_expr_descriptor (&argse, array_arg->expr);
+  gfc_add_block_to_block (&se->pre, &argse.pre);
+  gfc_add_block_to_block (&se->post, &argse.post);
+  desc = argse.expr;
+
+  gcc_assert (dim_arg->expr);
+  gfc_init_se (&argse, NULL);
+  gfc_conv_expr_type (&argse, dim_arg->expr, gfc_array_index_type);
+  gfc_add_block_to_block (&se->pre, &argse.pre);
+  tmp = fold_build2_loc (input_location, MINUS_EXPR, gfc_array_index_type,
+			 argse.expr, gfc_index_one_node);
+  se->expr = gfc_conv_descriptor_stride_get (desc, tmp);
+}
+
+
+static void
 gfc_conv_intrinsic_abs (gfc_se * se, gfc_expr * expr)
 {
   tree arg, cabs;
@@ -6806,6 +6835,10 @@ gfc_conv_intrinsic_function (gfc_se * se, gfc_expr * expr)
       gfc_conv_intrinsic_spacing (se, expr);
       break;
 
+    case GFC_ISYM_STRIDE:
+      conv_intrinsic_stride (se, expr);
+      break;
+
     case GFC_ISYM_SUM:
       gfc_conv_intrinsic_arith (se, expr, PLUS_EXPR, false);
       break;