--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/cp/cp-array-notation.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,1470 @@
+/* This file is part of the Intel(R) Cilk(TM) Plus support
+   It contains routines to handle Array Notation expression
+   handling routines in the C++ Compiler.
+   Copyright (C) 2013-2017 Free Software Foundation, Inc.
+   Contributed by Balaji V. Iyer <balaji.v.iyer@intel.com>,
+                  Intel Corporation
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3, or (at your option)
+   any later version.
+
+   GCC is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with GCC; see the file COPYING3.  If not see
+   <http://www.gnu.org/licenses/>.  */
+
+/* The Array Notation Transformation Technique:
+
+   An array notation expression has 4 major components:
+   1. The array name
+   2. Start Index
+   3. Number of elements we need to access (we call it length)
+   4. Stride
+
+   So, if we have something like A[0:5:2], we are accessing A[0], A[2], A[4],
+   A[6] and A[8]. The user is responsible to make sure the access length does
+   not step outside the array's size.
+   
+   In this section, I highlight the overall method on how array notations are
+   broken up into C/C++ code.  Almost all the functions follows this step:
+
+   Let's say the user has used the array notation in a statement like this:
+
+   A[St1:Ln:Str1] = B[St2:Ln:Str2] + <NON ARRAY_NOT STMT>
+
+   where St{1,2} = Starting index, Ln = Number of elements we need to access,
+   and Str{1,2} = the stride.
+   Note: The length of both the array notation expressions must be the same.
+   
+   The above expression is broken into the following:
+
+   for (Tmp_Var = 0; Tmp_Var < Ln; Tmp_Var++)
+     A[St1 + Tmp_Var * Str1] = B[St1 + Tmp_Var * Str2] + <NON_ARRAY_NOT_STMT>;
+*/
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "cp-tree.h"
+#include "tree-iterator.h"
+
+/* Creates a FOR_STMT with INIT, COND, INCR and BODY as the initializer,
+   condition, increment expression and the loop-body, respectively.  */
+
+static void
+create_an_loop (tree init, tree cond, tree incr, tree body)
+{
+  tree for_stmt;
+
+  finish_expr_stmt (init);
+  for_stmt = begin_for_stmt (NULL_TREE, NULL_TREE);
+  finish_init_stmt (for_stmt);
+  finish_for_cond (cond, for_stmt, false);
+  finish_for_expr (incr, for_stmt);
+  finish_expr_stmt (body);
+  finish_for_stmt (for_stmt);
+}
+
+/* If *VALUE is not a constant integer, then this function replaces it with
+   a variable to make it loop invariant for array notations.  */
+
+static inline void
+make_triplet_val_inv (tree *value)
+{
+  if (TREE_CODE (*value) != INTEGER_CST
+      && TREE_CODE (*value) != PARM_DECL
+      && !VAR_P (*value))
+    *value = get_temp_regvar (ptrdiff_type_node, *value);
+}
+
+/* Returns a vector of size RANK that contains an ARRAY_REF.  This vector is
+   created using array notation-triplet information stored in AN_INFO. The
+   induction var is taken from AN_LOOP_INFO.
+
+   For example: For an array notation A[5:10:2], the vector start will be
+   of size 1 holding '5', stride of same size as start but holding the value of
+   as 2, and is_vector as true.   Let's assume VAR is 'x'
+   This function returns a vector of size 1 with the following data:
+   A[5 + (x * 2)] .
+*/
+
+static vec<tree, va_gc> *
+create_array_refs (location_t loc, vec<vec<an_parts> > an_info,
+		   vec<an_loop_parts> an_loop_info, size_t size,  size_t rank)
+{
+  tree ind_mult, ind_incr;
+  vec<tree, va_gc> *array_operand = NULL;
+
+  for (size_t ii = 0; ii < size; ii++)
+    if (an_info[ii][0].is_vector)
+      {
+	tree array_opr = an_info[ii][rank - 1].value;
+	for (int s_jj = rank -1; s_jj >= 0; s_jj--)
+	  {
+	    tree start = cp_fold_convert (ptrdiff_type_node, 
+					  an_info[ii][s_jj].start);
+	    tree stride = cp_fold_convert (ptrdiff_type_node, 
+					   an_info[ii][s_jj].stride);
+	    tree var = cp_fold_convert (ptrdiff_type_node, 
+					an_loop_info[s_jj].var);
+
+	    ind_mult = build2 (MULT_EXPR, TREE_TYPE (var), var, stride);
+	    ind_incr = build2 (PLUS_EXPR, TREE_TYPE (var), start, ind_mult);
+	    /* Array [ start_index + (induction_var * stride)]  */
+	    array_opr = grok_array_decl	(loc, array_opr, ind_incr, false);
+	  }
+	vec_safe_push (array_operand, array_opr);
+      }
+    else
+      vec_safe_push (array_operand, integer_one_node);
+  return array_operand;
+}
+
+/* Populates the INCR and CMP fields in *NODE with the increment
+   (of type POSTINCREMENT) and comparison (of TYPE LT_EXPR) expressions, using 
+   data from AN_INFO.  */
+
+void
+create_cmp_incr (location_t loc, vec <an_loop_parts> *node, size_t rank, 
+		 vec<vec<an_parts> > an_info, tsubst_flags_t complain)
+{
+  for (size_t ii = 0; ii < rank; ii++)
+    {
+      (*node)[ii].incr = build_x_unary_op (loc, POSTINCREMENT_EXPR, 
+					   (*node)[ii].var, complain);
+      (*node)[ii].cmp = build_x_binary_op (loc, LT_EXPR, (*node)[ii].var,
+					   TREE_CODE ((*node)[ii].var),
+					   an_info[0][ii].length,
+					   TREE_CODE (an_info[0][ii].length),
+					   NULL, complain);
+    }
+}
+
+/* Replaces all the scalar expressions in *NODE.  Returns a STATEMENT LIST that
+   holds the NODE along with the variables that hold the results of the
+   invariant expressions.  */
+
+static tree
+replace_invariant_exprs (tree *node)
+{
+  size_t ix = 0;
+  tree node_list = NULL_TREE;
+  tree t = NULL_TREE, new_var = NULL_TREE;
+  struct inv_list data;
+
+  data.list_values = NULL;
+  data.replacement = NULL;
+  data.additional_tcodes = NULL;
+  cp_walk_tree (node, find_inv_trees, (void *) &data, NULL);
+
+  if (vec_safe_length (data.list_values))
+    {
+      node_list = push_stmt_list ();
+      for (ix = 0; vec_safe_iterate (data.list_values, ix, &t); ix++)
+	{ 
+	  /* Sometimes, when comma_expr has a function call in it, it will
+	     typecast it to void.  Find_inv_trees finds those nodes and so
+	     if it void type, then don't bother creating a new var to hold 
+	     the return value.   */
+	  if (VOID_TYPE_P (TREE_TYPE (t)))
+	    {
+	      finish_expr_stmt (t);
+	      new_var = void_node;
+	    }
+	  else 
+	    new_var = get_temp_regvar (TREE_TYPE (t), t); 
+	  vec_safe_push (data.replacement, new_var);
+	}
+      cp_walk_tree (node, replace_inv_trees, (void *) &data, NULL);
+      node_list = pop_stmt_list (node_list);
+    }
+  return node_list;
+}
+
+/* Replace array notation's built-in function passed in AN_BUILTIN_FN with
+   the appropriate loop and computation (all stored in variable LOOP of type
+   tree node).  The output of the function is always a scalar and that
+   result is returned in *NEW_VAR.  *NEW_VAR is NULL_TREE if the function is
+   __sec_reduce_mutating.  */
+
+static tree
+expand_sec_reduce_builtin (tree an_builtin_fn, tree *new_var)
+{
+  tree new_var_type = NULL_TREE, func_parm, new_yes_expr, new_no_expr;
+  tree array_ind_value = NULL_TREE, new_no_ind, new_yes_ind, new_no_list;
+  tree new_yes_list, new_cond_expr, new_expr = NULL_TREE; 
+  vec<tree, va_gc> *array_list = NULL, *array_operand = NULL;
+  size_t list_size = 0, rank = 0, ii = 0;
+  tree  body, an_init, loop_with_init = alloc_stmt_list ();
+  tree array_op0, comp_node = NULL_TREE;
+  tree call_fn = NULL_TREE, identity_value = NULL_TREE;
+  tree init = NULL_TREE, cond_init = NULL_TREE;
+  enum tree_code code = NOP_EXPR;
+  location_t location = UNKNOWN_LOCATION;
+  vec<vec<an_parts> > an_info = vNULL;
+  auto_vec<an_loop_parts> an_loop_info;
+  enum built_in_function an_type =
+    is_cilkplus_reduce_builtin (CALL_EXPR_FN (an_builtin_fn));
+  vec <tree, va_gc> *func_args;
+  
+  if (an_type == BUILT_IN_NONE)
+    return NULL_TREE;
+
+  if (an_type != BUILT_IN_CILKPLUS_SEC_REDUCE
+      && an_type != BUILT_IN_CILKPLUS_SEC_REDUCE_MUTATING)
+    func_parm = CALL_EXPR_ARG (an_builtin_fn, 0);
+  else
+    {
+      call_fn = CALL_EXPR_ARG (an_builtin_fn, 2);
+
+      /* We need to do this because we are "faking" the builtin function types,
+	 so the compiler does a bunch of typecasts and this will get rid of
+	 all that!  */
+      STRIP_NOPS (call_fn);
+      if (TREE_CODE (call_fn) != OVERLOAD
+	  && TREE_CODE (call_fn) != FUNCTION_DECL)
+	call_fn = TREE_OPERAND (call_fn, 0);
+      identity_value = CALL_EXPR_ARG (an_builtin_fn, 0);
+      func_parm = CALL_EXPR_ARG (an_builtin_fn, 1);
+      STRIP_NOPS (identity_value);
+    }
+  STRIP_NOPS (func_parm);
+  
+  location = EXPR_LOCATION (an_builtin_fn);
+  
+  /* Note about using find_rank (): If find_rank returns false, then it must
+     have already reported an error, thus we just return an error_mark_node
+     without any doing any error emission.  */  
+  if (!find_rank (location, an_builtin_fn, an_builtin_fn, true, &rank))
+      return error_mark_node;
+  if (rank == 0)
+    {
+      error_at (location, "Invalid builtin arguments");
+      return error_mark_node;
+    }
+  else if (rank > 1 
+	   && (an_type == BUILT_IN_CILKPLUS_SEC_REDUCE_MAX_IND
+	       || an_type == BUILT_IN_CILKPLUS_SEC_REDUCE_MIN_IND))
+    { 
+      error_at (location, "__sec_reduce_min_ind or __sec_reduce_max_ind cannot "
+		"have arrays with dimension greater than 1");
+      return error_mark_node;
+    }
+  
+  extract_array_notation_exprs (func_parm, true, &array_list);
+  list_size = vec_safe_length (array_list);
+  switch (an_type)
+    {
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_ADD:
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MUL:
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MAX:
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MIN:
+      new_var_type = TREE_TYPE ((*array_list)[0]);
+      break;
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_ALL_ZERO:
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_ANY_ZERO:
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_ANY_NONZERO:
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_ALL_NONZERO:
+      new_var_type = boolean_type_node;
+      break;
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MAX_IND:
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MIN_IND:
+      new_var_type = size_type_node;
+      break;
+    case BUILT_IN_CILKPLUS_SEC_REDUCE:
+      if (call_fn && identity_value)
+	new_var_type = TREE_TYPE ((*array_list)[0]);
+      break;
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MUTATING:
+      new_var_type = NULL_TREE;
+      break;
+    default:
+      gcc_unreachable ();
+    }
+    
+  if (new_var_type && TREE_CODE (new_var_type) == ARRAY_TYPE)
+    new_var_type = TREE_TYPE (new_var_type);
+  an_loop_info.safe_grow_cleared (rank);
+
+  an_init = push_stmt_list ();
+
+  /* Assign the array notation components to variable so that they can satisfy
+     the exec-once rule.  */
+  for (ii = 0; ii < list_size; ii++)
+    if (TREE_CODE ((*array_list)[ii]) == ARRAY_NOTATION_REF)
+      {
+	tree anode = (*array_list)[ii];
+	make_triplet_val_inv (&ARRAY_NOTATION_START (anode));
+	make_triplet_val_inv (&ARRAY_NOTATION_LENGTH (anode));
+	make_triplet_val_inv (&ARRAY_NOTATION_STRIDE (anode));
+      }
+  cilkplus_extract_an_triplets (array_list, list_size, rank, &an_info);
+  for (ii = 0; ii < rank; ii++)
+    {
+      tree typ = ptrdiff_type_node;
+
+      /* In this place, we are using get_temp_regvar instead of 
+	 create_temporary_var if an_type is SEC_REDUCE_MAX/MIN_IND because
+	 the array_ind_value depends on this value being initalized to 0.  */
+      if (an_type == BUILT_IN_CILKPLUS_SEC_REDUCE_MAX_IND
+	  || an_type == BUILT_IN_CILKPLUS_SEC_REDUCE_MIN_IND) 
+	an_loop_info[ii].var = get_temp_regvar (typ, build_zero_cst (typ));
+      else
+	{
+	  an_loop_info[ii].var = create_temporary_var (typ);
+	  add_decl_expr (an_loop_info[ii].var);
+	}
+      an_loop_info[ii].ind_init = 
+	build_x_modify_expr (location, an_loop_info[ii].var, INIT_EXPR,
+			     build_zero_cst (typ), tf_warning_or_error);
+    }
+  array_operand = create_array_refs (location, an_info, an_loop_info,
+				      list_size, rank);
+  replace_array_notations (&func_parm, true, array_list, array_operand);
+  
+  if (!TREE_TYPE (func_parm))      
+    TREE_TYPE (func_parm) = TREE_TYPE ((*array_list)[0]);
+  
+  create_cmp_incr (location, &an_loop_info, rank, an_info, tf_warning_or_error);
+  if (an_type == BUILT_IN_CILKPLUS_SEC_REDUCE_MAX_IND
+      || an_type == BUILT_IN_CILKPLUS_SEC_REDUCE_MIN_IND) 
+    array_ind_value = get_temp_regvar (TREE_TYPE (func_parm), func_parm);
+
+  array_op0 = (*array_operand)[0];
+  if (INDIRECT_REF_P (array_op0))
+    array_op0 = TREE_OPERAND (array_op0, 0);
+  switch (an_type)
+    {
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_ADD:
+      code = PLUS_EXPR;
+      init = build_zero_cst (new_var_type);
+      break;
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MUL:
+      code = MULT_EXPR;
+      init = build_one_cst (new_var_type);
+      break;
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_ANY_ZERO:
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_ANY_NONZERO:
+      code = ((an_type == BUILT_IN_CILKPLUS_SEC_REDUCE_ANY_ZERO) ? EQ_EXPR
+	: NE_EXPR);
+      init = build_zero_cst (new_var_type);
+      cond_init = build_one_cst (new_var_type);
+      comp_node = build_zero_cst (TREE_TYPE (func_parm));
+      break;
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_ALL_ZERO:
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_ALL_NONZERO:
+      code = ((an_type == BUILT_IN_CILKPLUS_SEC_REDUCE_ALL_ZERO) ? NE_EXPR
+	: EQ_EXPR);
+      init = build_one_cst (new_var_type);
+      cond_init = build_zero_cst (new_var_type);
+      comp_node = build_zero_cst (TREE_TYPE (func_parm));
+      break;
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MAX:
+      code = MAX_EXPR;
+      init = (TYPE_MIN_VALUE (new_var_type) ? TYPE_MIN_VALUE (new_var_type)
+	: func_parm);
+      break;
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MIN:
+      code = MIN_EXPR;
+      init = (TYPE_MAX_VALUE (new_var_type) ? TYPE_MAX_VALUE (new_var_type)
+	: func_parm);
+      break;
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MIN_IND:
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MAX_IND:
+      code = (an_type == BUILT_IN_CILKPLUS_SEC_REDUCE_MAX_IND ? LE_EXPR
+	: GE_EXPR);
+      init = an_loop_info[0].var;
+      break;
+    case BUILT_IN_CILKPLUS_SEC_REDUCE:
+      init = identity_value;
+      break;
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MUTATING:
+      init = NULL_TREE;
+      break;
+    default:
+      gcc_unreachable ();
+    }
+
+  if (an_type != BUILT_IN_CILKPLUS_SEC_REDUCE_MUTATING)
+    *new_var = get_temp_regvar (new_var_type, init);
+  else
+    *new_var = NULL_TREE;
+
+  switch (an_type)
+    {
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_ADD:
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MUL:      
+      new_expr = build_x_modify_expr (location, *new_var, code, func_parm,
+				      tf_warning_or_error);
+      break;
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_ALL_ZERO:
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_ALL_NONZERO:
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_ANY_ZERO:
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_ANY_NONZERO:
+      /* In all these cases, assume the false case is true and as soon as
+	 we find a true case,  set the true flag on and latch it in.  */
+      new_yes_expr = build_x_modify_expr (location, *new_var, NOP_EXPR,
+					  cond_init, tf_warning_or_error);
+      new_no_expr = build_x_modify_expr (location, *new_var, NOP_EXPR,
+					 *new_var, tf_warning_or_error);
+      new_cond_expr = build_x_binary_op
+	(location, code, func_parm, TREE_CODE (func_parm), comp_node,
+	 TREE_CODE (comp_node), NULL, tf_warning_or_error);
+      new_expr = build_x_conditional_expr (location, new_cond_expr,
+					   new_yes_expr, new_no_expr,
+					   tf_warning_or_error);
+      break;
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MAX:
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MIN:
+      new_cond_expr = build_x_binary_op
+	(location, code, *new_var, TREE_CODE (*new_var), func_parm,
+	 TREE_CODE (func_parm), NULL, tf_warning_or_error);
+      new_expr = build_x_modify_expr (location, *new_var, NOP_EXPR, func_parm,
+				      tf_warning_or_error);
+      break;
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MAX_IND:
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MIN_IND:
+      new_yes_expr = build_x_modify_expr (location, array_ind_value, NOP_EXPR,
+					  func_parm, tf_warning_or_error);
+      new_no_expr = build_x_modify_expr (location, array_ind_value, NOP_EXPR,
+					 array_ind_value, tf_warning_or_error);
+      if (list_size > 1)
+	new_yes_ind = build_x_modify_expr (location, *new_var, NOP_EXPR,
+					   an_loop_info[0].var,
+					   tf_warning_or_error);
+      else
+	new_yes_ind = build_x_modify_expr (location, *new_var, NOP_EXPR,
+					   TREE_OPERAND (array_op0, 1),
+					   tf_warning_or_error);
+      new_no_ind = build_x_modify_expr (location, *new_var, NOP_EXPR, *new_var,
+					tf_warning_or_error);
+      new_yes_list = alloc_stmt_list ();
+      append_to_statement_list (new_yes_ind, &new_yes_list);
+      append_to_statement_list (new_yes_expr, &new_yes_list);
+
+      new_no_list = alloc_stmt_list ();
+      append_to_statement_list (new_no_ind, &new_no_list);
+      append_to_statement_list (new_no_expr, &new_no_list);
+
+      new_cond_expr = build_x_binary_op (location, code, array_ind_value,
+					 TREE_CODE (array_ind_value), func_parm,
+					 TREE_CODE (func_parm), NULL,
+					 tf_warning_or_error);
+      new_expr = build_x_conditional_expr (location, new_cond_expr,
+					   new_yes_list, new_no_list,
+					   tf_warning_or_error);
+      break;
+    case BUILT_IN_CILKPLUS_SEC_REDUCE:
+    case BUILT_IN_CILKPLUS_SEC_REDUCE_MUTATING:
+      func_args = make_tree_vector ();
+      if (an_type == BUILT_IN_CILKPLUS_SEC_REDUCE)
+	vec_safe_push (func_args, *new_var);
+      else
+	vec_safe_push (func_args, identity_value);
+      vec_safe_push (func_args, func_parm);
+
+      new_expr = finish_call_expr (call_fn, &func_args, false, true,
+				   tf_warning_or_error);
+      if (an_type == BUILT_IN_CILKPLUS_SEC_REDUCE)
+	new_expr = build_x_modify_expr (location, *new_var, NOP_EXPR, new_expr,
+					tf_warning_or_error);
+      release_tree_vector (func_args);
+      break;
+    default:
+      gcc_unreachable ();
+    }
+  an_init = pop_stmt_list (an_init);
+  append_to_statement_list (an_init, &loop_with_init);
+  body = new_expr;
+
+  for (ii = 0; ii < rank; ii++)
+    {
+      tree new_loop = push_stmt_list ();
+      create_an_loop (an_loop_info[ii].ind_init, an_loop_info[ii].cmp,
+		      an_loop_info[ii].incr, body);
+      body = pop_stmt_list (new_loop);
+    }
+  append_to_statement_list (body, &loop_with_init);
+
+  release_vec_vec (an_info);
+
+  return loop_with_init;
+}
+
+/* Returns a loop with ARRAY_REF inside it with an appropriate modify expr.
+   The LHS and/or RHS will be array notation expressions that have a
+   MODIFYCODE.  The location of the variable is specified by LOCATION. */
+
+static tree
+expand_an_in_modify_expr (location_t location, tree lhs,
+			  enum tree_code modifycode, tree rhs,
+			  tsubst_flags_t complain)
+{
+  tree array_expr_lhs = NULL_TREE, array_expr_rhs = NULL_TREE;
+  tree array_expr = NULL_TREE;
+  tree body = NULL_TREE;
+  auto_vec<tree> cond_expr;
+  vec<tree, va_gc> *lhs_array_operand = NULL, *rhs_array_operand = NULL;
+  size_t lhs_rank = 0, rhs_rank = 0, ii = 0;
+  vec<tree, va_gc> *rhs_list = NULL, *lhs_list = NULL;
+  size_t rhs_list_size = 0, lhs_list_size = 0;
+  tree new_modify_expr, new_var = NULL_TREE, builtin_loop, scalar_mods;
+  bool found_builtin_fn = false;
+  tree an_init, loop_with_init = alloc_stmt_list ();
+  vec<vec<an_parts> > lhs_an_info = vNULL, rhs_an_info = vNULL;
+  auto_vec<an_loop_parts> lhs_an_loop_info, rhs_an_loop_info;
+  tree lhs_len, rhs_len;
+
+  if (!find_rank (location, rhs, rhs, false, &rhs_rank))
+    return error_mark_node;
+  extract_array_notation_exprs (rhs, false, &rhs_list);
+  rhs_list_size = vec_safe_length (rhs_list);
+  an_init = push_stmt_list ();
+  if (rhs_rank)
+    {
+      scalar_mods = replace_invariant_exprs (&rhs);
+      if (scalar_mods)
+	finish_expr_stmt (scalar_mods);
+    }
+  for (ii = 0; ii < rhs_list_size; ii++)
+    {
+      tree rhs_node = (*rhs_list)[ii];
+      if (TREE_CODE (rhs_node) == CALL_EXPR)
+	{
+	  builtin_loop = expand_sec_reduce_builtin (rhs_node, &new_var);
+	  if (builtin_loop == error_mark_node)
+	    return error_mark_node;
+	  else if (builtin_loop)
+	    {
+	      finish_expr_stmt (builtin_loop);
+	      found_builtin_fn = true;
+	      if (new_var)
+		{
+		  vec <tree, va_gc> *rhs_sub_list = NULL, *new_var_list = NULL;
+		  vec_safe_push (rhs_sub_list, rhs_node);
+		  vec_safe_push (new_var_list, new_var);
+		  replace_array_notations (&rhs, false, rhs_sub_list,
+					   new_var_list);
+		}
+	    }
+	}
+    }
+  lhs_rank = 0;
+  rhs_rank = 0;
+  if (!find_rank (location, lhs, lhs, true, &lhs_rank)
+      || !find_rank (location, rhs, rhs, true, &rhs_rank))
+    {
+      pop_stmt_list (an_init);
+      return error_mark_node;
+    }
+
+  /* If both are scalar, then the only reason why we will get this far is if
+     there is some array notations inside it and was using a builtin array
+     notation functions.  If so, we have already broken those guys up and now 
+     a simple build_x_modify_expr would do.  */
+  if (lhs_rank == 0 && rhs_rank == 0)
+    {
+      if (found_builtin_fn)
+	{
+	  new_modify_expr = build_x_modify_expr (location, lhs,
+						 modifycode, rhs, complain);
+	  finish_expr_stmt (new_modify_expr);
+	  pop_stmt_list (an_init);
+	  return an_init;
+	}
+      else
+	gcc_unreachable ();
+    }
+
+  /* If for some reason location is not set, then find if LHS or RHS has
+     location info.  If so, then use that so we atleast have an idea.  */
+  if (location == UNKNOWN_LOCATION)
+    {
+      if (EXPR_LOCATION (lhs) != UNKNOWN_LOCATION)
+	location = EXPR_LOCATION (lhs);
+      else if (EXPR_LOCATION (rhs) != UNKNOWN_LOCATION)
+	location = EXPR_LOCATION (rhs);
+    }
+      
+  /* We need this when we have a scatter issue.  */
+  extract_array_notation_exprs (lhs, true, &lhs_list);
+  rhs_list = NULL;
+  extract_array_notation_exprs (rhs, true, &rhs_list);
+  rhs_list_size = vec_safe_length (rhs_list);
+  lhs_list_size = vec_safe_length (lhs_list);
+    
+  if (lhs_rank == 0 && rhs_rank != 0)
+    {
+      error_at (location, "%qE cannot be scalar when %qE is not", lhs, rhs);
+      return error_mark_node;
+    }
+  if (lhs_rank != 0 && rhs_rank != 0 && lhs_rank != rhs_rank)
+    {
+      error_at (location, "rank mismatch between %qE and %qE", lhs, rhs);
+      return error_mark_node;
+    }
+  
+  /* Assign the array notation components to variable so that they can satisfy
+     the execute-once rule.  */
+  for (ii = 0; ii < lhs_list_size; ii++)
+    {
+      tree anode = (*lhs_list)[ii];
+      make_triplet_val_inv (&ARRAY_NOTATION_START (anode));
+      make_triplet_val_inv (&ARRAY_NOTATION_LENGTH (anode));
+      make_triplet_val_inv (&ARRAY_NOTATION_STRIDE (anode));
+    }
+  for (ii = 0; ii < rhs_list_size; ii++)
+    if ((*rhs_list)[ii] && TREE_CODE ((*rhs_list)[ii]) == ARRAY_NOTATION_REF)
+      {
+	tree aa = (*rhs_list)[ii];
+	make_triplet_val_inv (&ARRAY_NOTATION_START (aa));
+	make_triplet_val_inv (&ARRAY_NOTATION_LENGTH (aa));
+	make_triplet_val_inv (&ARRAY_NOTATION_STRIDE (aa));
+      }
+  lhs_an_loop_info.safe_grow_cleared (lhs_rank);
+  
+  if (rhs_rank)
+    rhs_an_loop_info.safe_grow_cleared (rhs_rank);
+
+  cond_expr.safe_grow_cleared (MAX (lhs_rank, rhs_rank));
+  cilkplus_extract_an_triplets (lhs_list, lhs_list_size, lhs_rank,
+				&lhs_an_info);
+  if (rhs_list)
+    cilkplus_extract_an_triplets (rhs_list, rhs_list_size, rhs_rank,
+				  &rhs_an_info);
+  if (length_mismatch_in_expr_p (EXPR_LOCATION (lhs), lhs_an_info)
+      || (rhs_list && length_mismatch_in_expr_p (EXPR_LOCATION (rhs),
+						 rhs_an_info)))
+    {
+      pop_stmt_list (an_init);
+      goto error;
+    }
+  rhs_len = ((rhs_list_size > 0 && rhs_rank > 0) ?
+    rhs_an_info[0][0].length : NULL_TREE);
+  lhs_len = ((lhs_list_size > 0 && lhs_rank > 0) ?
+    lhs_an_info[0][0].length : NULL_TREE);
+  if (lhs_list_size > 0 && rhs_list_size > 0 && lhs_rank > 0 && rhs_rank > 0
+      && TREE_CODE (lhs_len) == INTEGER_CST && rhs_len
+      && TREE_CODE (rhs_len) == INTEGER_CST 
+      && !tree_int_cst_equal (rhs_len, lhs_len))
+    { 
+      error_at (location, "length mismatch between LHS and RHS"); 
+      pop_stmt_list (an_init); 
+      goto error;
+    }
+   for (ii = 0; ii < lhs_rank; ii++) 
+     {
+       tree typ = ptrdiff_type_node; 
+       lhs_an_loop_info[ii].var = create_temporary_var (typ);
+       add_decl_expr (lhs_an_loop_info[ii].var);
+       lhs_an_loop_info[ii].ind_init = build_x_modify_expr 
+	 (location, lhs_an_loop_info[ii].var, INIT_EXPR, build_zero_cst (typ), 
+	  complain);
+     }
+   
+   if (rhs_list_size > 0)
+     {
+       rhs_array_operand = fix_sec_implicit_args (location, rhs_list,
+						  lhs_an_loop_info, lhs_rank,
+						  lhs); 
+       if (!rhs_array_operand)
+	 goto error;
+     }
+  replace_array_notations (&rhs, true, rhs_list, rhs_array_operand);
+  rhs_list_size = 0;
+  rhs_list = NULL;
+  extract_array_notation_exprs (rhs, true, &rhs_list);
+  rhs_list_size = vec_safe_length (rhs_list);    
+
+  for (ii = 0; ii < rhs_rank; ii++)
+    {
+      tree typ = ptrdiff_type_node;
+      rhs_an_loop_info[ii].var = create_temporary_var (typ);
+      add_decl_expr (rhs_an_loop_info[ii].var);
+      rhs_an_loop_info[ii].ind_init = build_x_modify_expr
+	(location, rhs_an_loop_info[ii].var, INIT_EXPR, build_zero_cst (typ), 
+	 complain);
+    }
+
+  if (lhs_rank)
+    {
+      lhs_array_operand =
+	create_array_refs (location, lhs_an_info, lhs_an_loop_info,
+			    lhs_list_size, lhs_rank);
+      replace_array_notations (&lhs, true, lhs_list, lhs_array_operand);
+    }
+  
+  if (rhs_array_operand)
+    vec_safe_truncate (rhs_array_operand, 0);
+  if (rhs_rank)
+    {
+      rhs_array_operand = create_array_refs (location, rhs_an_info,
+					      rhs_an_loop_info, rhs_list_size,
+					      rhs_rank);
+      /* Replace all the array refs created by the above function because this
+	 variable is blown away by the fix_sec_implicit_args function below.  */
+      replace_array_notations (&rhs, true, rhs_list, rhs_array_operand);
+      vec_safe_truncate (rhs_array_operand , 0);
+      rhs_array_operand = fix_sec_implicit_args (location, rhs_list,
+						 rhs_an_loop_info, rhs_rank,
+						 rhs);
+      if (!rhs_array_operand)
+	goto error;
+      replace_array_notations (&rhs, true, rhs_list, rhs_array_operand);
+    }
+
+  array_expr_rhs = rhs;
+  array_expr_lhs = lhs;
+  
+  array_expr = build_x_modify_expr (location, array_expr_lhs, modifycode,
+				    array_expr_rhs, complain);
+  create_cmp_incr (location, &lhs_an_loop_info, lhs_rank, lhs_an_info,
+		   complain);
+  if (rhs_rank) 
+    create_cmp_incr (location, &rhs_an_loop_info, rhs_rank, rhs_an_info, 
+		     complain);
+  for (ii = 0; ii < MAX (rhs_rank, lhs_rank); ii++)
+    if (ii < lhs_rank && ii < rhs_rank)
+      cond_expr[ii] = build_x_binary_op
+	(location, TRUTH_ANDIF_EXPR, lhs_an_loop_info[ii].cmp,
+	 TREE_CODE (lhs_an_loop_info[ii].cmp), rhs_an_loop_info[ii].cmp,
+	 TREE_CODE (rhs_an_loop_info[ii].cmp), NULL, complain);
+    else if (ii < lhs_rank && ii >= rhs_rank)
+      cond_expr[ii] = lhs_an_loop_info[ii].cmp;
+    else
+      /* No need to compare ii < rhs_rank && ii >= lhs_rank because in a valid 
+	 Array notation expression, rank of RHS cannot be greater than LHS.  */
+      gcc_unreachable ();
+  
+  an_init = pop_stmt_list (an_init);
+  append_to_statement_list (an_init, &loop_with_init);
+  body = array_expr;
+  for (ii = 0; ii < MAX (lhs_rank, rhs_rank); ii++)
+    {
+      tree incr_list = alloc_stmt_list ();
+      tree init_list = alloc_stmt_list ();
+      tree new_loop = push_stmt_list ();
+
+      if (lhs_rank)
+	{
+	  append_to_statement_list (lhs_an_loop_info[ii].ind_init, &init_list);
+	  append_to_statement_list (lhs_an_loop_info[ii].incr, &incr_list);
+	}
+      if (rhs_rank)
+	{
+	  append_to_statement_list (rhs_an_loop_info[ii].ind_init, &init_list);
+	  append_to_statement_list (rhs_an_loop_info[ii].incr, &incr_list);
+	}
+      create_an_loop (init_list, cond_expr[ii], incr_list, body);
+      body = pop_stmt_list (new_loop);
+    }
+  append_to_statement_list (body, &loop_with_init);
+
+  release_vec_vec (lhs_an_info);
+  release_vec_vec (rhs_an_info);
+
+  return loop_with_init;
+
+error:
+  release_vec_vec (lhs_an_info);
+  release_vec_vec (rhs_an_info);
+
+  return error_mark_node;
+}
+
+/* Helper function for expand_conditonal_array_notations.  Encloses the
+   conditional statement passed in ORIG_STMT with a loop around it and
+   replaces the condition in STMT with a ARRAY_REF tree-node to the array.  
+   The condition must have a ARRAY_NOTATION_REF tree.  */
+
+static tree
+cp_expand_cond_array_notations (tree orig_stmt)
+{
+  vec<tree, va_gc> *array_list = NULL, *array_operand = NULL;
+  size_t list_size = 0;
+  size_t rank = 0, ii = 0;
+  tree an_init, body, stmt = NULL_TREE;
+  tree builtin_loop, new_var = NULL_TREE;
+  tree loop_with_init = alloc_stmt_list ();
+  location_t location = UNKNOWN_LOCATION;
+  vec<vec<an_parts> > an_info = vNULL;
+  auto_vec<an_loop_parts> an_loop_info;
+
+  if (TREE_CODE (orig_stmt) == COND_EXPR)
+    {
+      size_t cond_rank = 0, yes_rank = 0, no_rank = 0;
+      tree yes_expr = COND_EXPR_THEN (orig_stmt);
+      tree no_expr = COND_EXPR_ELSE (orig_stmt);
+      tree cond = COND_EXPR_COND (orig_stmt);
+      if (!find_rank (EXPR_LOCATION (cond), cond, cond, true, &cond_rank)
+	  || !find_rank (EXPR_LOCATION (yes_expr), yes_expr, yes_expr, true,
+			 &yes_rank)
+	  || !find_rank (EXPR_LOCATION (no_expr), no_expr, no_expr, true,
+			 &no_rank))
+	return error_mark_node;
+      /* If the condition has a zero rank, then handle array notations in body
+	 separately.  */
+      if (cond_rank == 0)
+	return orig_stmt;
+      if (cond_rank != yes_rank && yes_rank != 0)
+	{
+	  error_at (EXPR_LOCATION (yes_expr), "rank mismatch with controlling"
+		    " expression of parent if-statement");
+	  return error_mark_node;
+	}
+      else if (cond_rank != no_rank && no_rank != 0)
+	{
+	  error_at (EXPR_LOCATION (no_expr), "rank mismatch with controlling "
+		    "expression of parent if-statement");
+	  return error_mark_node;
+	}
+    }
+  else if (TREE_CODE (orig_stmt) == IF_STMT)
+    {
+      size_t cond_rank = 0, yes_rank = 0, no_rank = 0;
+      tree yes_expr = THEN_CLAUSE (orig_stmt);
+      tree no_expr = ELSE_CLAUSE (orig_stmt);
+      tree cond = IF_COND (orig_stmt);
+      if (!find_rank (EXPR_LOCATION (cond), cond, cond, true, &cond_rank)
+	  || (yes_expr
+	      && !find_rank (EXPR_LOCATION (yes_expr), yes_expr, yes_expr, true,
+			     &yes_rank))
+	  || (no_expr
+	      && !find_rank (EXPR_LOCATION (no_expr), no_expr, no_expr, true,
+			     &no_rank)))
+	return error_mark_node;
+
+      /* Same reasoning as for COND_EXPR.  */
+      if (cond_rank == 0)
+	return orig_stmt;
+      else if (cond_rank != yes_rank && yes_rank != 0)
+	{
+	  error_at (EXPR_LOCATION (yes_expr), "rank mismatch with controlling"
+		    " expression of parent if-statement");
+	  return error_mark_node;
+	}
+      else if (cond_rank != no_rank && no_rank != 0)
+	{
+	  error_at (EXPR_LOCATION (no_expr), "rank mismatch with controlling "
+		    "expression of parent if-statement");
+	  return error_mark_node;
+	}
+    }
+  else if (truth_value_p (TREE_CODE (orig_stmt)))
+    {
+      size_t left_rank = 0, right_rank = 0;
+      tree left_expr = TREE_OPERAND (orig_stmt, 0);
+      tree right_expr = TREE_OPERAND (orig_stmt, 1);
+      if (!find_rank (EXPR_LOCATION (left_expr), left_expr, left_expr, true,
+		      &left_rank)
+	  || !find_rank (EXPR_LOCATION (right_expr), right_expr, right_expr,
+			 true, &right_rank))
+	return error_mark_node;
+      if (right_rank == 0 && left_rank == 0)
+	return orig_stmt;
+    }
+
+  if (!find_rank (EXPR_LOCATION (orig_stmt), orig_stmt, orig_stmt, true,
+		  &rank))
+    return error_mark_node;
+  if (rank == 0)
+    return orig_stmt;
+
+  extract_array_notation_exprs (orig_stmt, false, &array_list);
+  stmt = alloc_stmt_list ();
+  for (ii = 0; ii < vec_safe_length (array_list); ii++)
+    {
+      tree array_node = (*array_list)[ii];
+      if (TREE_CODE (array_node) == CALL_EXPR
+	  || TREE_CODE (array_node) == AGGR_INIT_EXPR)
+	{
+	  builtin_loop = expand_sec_reduce_builtin (array_node, &new_var);
+	  if (builtin_loop == error_mark_node)
+	    finish_expr_stmt (error_mark_node);
+	  else if (new_var)
+	    {
+	      vec<tree, va_gc> *sub_list = NULL, *new_var_list = NULL;
+	      vec_safe_push (sub_list, array_node);
+	      vec_safe_push (new_var_list, new_var);
+	      replace_array_notations (&orig_stmt, false, sub_list,
+				       new_var_list);
+	      append_to_statement_list (builtin_loop, &stmt);
+	    }
+	}
+    }
+  append_to_statement_list (orig_stmt, &stmt);
+  rank = 0;
+  array_list = NULL;
+  if (!find_rank (EXPR_LOCATION (stmt), stmt, stmt, true, &rank))
+    return error_mark_node;
+  if (rank == 0)
+    return stmt;
+  
+  extract_array_notation_exprs (stmt, true, &array_list);
+  list_size = vec_safe_length (array_list);
+  if (list_size == 0)
+    return stmt;
+
+  location = EXPR_LOCATION (orig_stmt);
+  list_size = vec_safe_length (array_list);
+  an_loop_info.safe_grow_cleared (rank);
+  
+  an_init = push_stmt_list ();
+
+  /* Assign the array notation components to variable so that they can
+     satisfy the exec-once rule.  */
+  for (ii = 0; ii < list_size; ii++)
+    {
+      tree anode = (*array_list)[ii];
+      make_triplet_val_inv (&ARRAY_NOTATION_START (anode));
+      make_triplet_val_inv (&ARRAY_NOTATION_LENGTH (anode));
+      make_triplet_val_inv (&ARRAY_NOTATION_STRIDE (anode));
+    }
+  cilkplus_extract_an_triplets (array_list, list_size, rank, &an_info);
+
+  for (ii = 0; ii < rank; ii++) 
+    {
+      tree typ = ptrdiff_type_node;
+      an_loop_info[ii].var = create_temporary_var (typ);
+      add_decl_expr (an_loop_info[ii].var);
+      an_loop_info[ii].ind_init =
+	build_x_modify_expr (location, an_loop_info[ii].var, INIT_EXPR,
+			     build_zero_cst (typ), tf_warning_or_error);
+    }
+  array_operand = create_array_refs (location, an_info, an_loop_info,
+				     list_size, rank);
+  replace_array_notations (&stmt, true, array_list, array_operand);
+  create_cmp_incr (location, &an_loop_info, rank, an_info, tf_warning_or_error);
+  
+  an_init = pop_stmt_list (an_init);
+  append_to_statement_list (an_init, &loop_with_init);
+  body = stmt;
+
+  for (ii = 0; ii < rank; ii++)
+    {
+      tree new_loop = push_stmt_list ();
+      create_an_loop (an_loop_info[ii].ind_init, an_loop_info[ii].cmp,
+		      an_loop_info[ii].incr, body);
+      body = pop_stmt_list (new_loop);
+    }
+  append_to_statement_list (body, &loop_with_init);
+
+  release_vec_vec (an_info);
+  
+  return loop_with_init;
+}
+
+/* Transforms array notations inside unary expression ORIG_STMT with an
+   appropriate loop and ARRAY_REF (and returns all this as a super-tree called
+   LOOP).  */
+
+static tree
+expand_unary_array_notation_exprs (tree orig_stmt)
+{
+  vec<tree, va_gc> *array_list = NULL, *array_operand = NULL;
+  size_t list_size = 0, rank = 0, ii = 0;
+  tree body;
+  tree builtin_loop, stmt = NULL_TREE, new_var = NULL_TREE;
+  location_t location = EXPR_LOCATION (orig_stmt);
+  tree an_init, loop_with_init = alloc_stmt_list ();
+  vec<vec<an_parts> > an_info = vNULL;
+  auto_vec<an_loop_parts> an_loop_info;
+  
+  if (!find_rank (location, orig_stmt, orig_stmt, true, &rank))
+    return error_mark_node;
+  if (rank == 0)
+    return orig_stmt;  
+  
+  extract_array_notation_exprs (orig_stmt, false, &array_list);
+  list_size = vec_safe_length (array_list);
+  location = EXPR_LOCATION (orig_stmt);
+  stmt = NULL_TREE;
+  for (ii = 0; ii < list_size; ii++)
+    if (TREE_CODE ((*array_list)[ii]) == CALL_EXPR
+	|| TREE_CODE ((*array_list)[ii]) == AGGR_INIT_EXPR)
+      {
+	tree list_node = (*array_list)[ii];
+	builtin_loop = expand_sec_reduce_builtin (list_node, &new_var);
+	if (builtin_loop == error_mark_node)
+	  return error_mark_node;
+	else if (builtin_loop)
+	  {
+	    vec<tree, va_gc> *sub_list = NULL, *new_var_list = NULL;
+	    stmt = alloc_stmt_list ();
+	    append_to_statement_list (builtin_loop, &stmt);
+	    vec_safe_push (sub_list, list_node);
+	    vec_safe_push (new_var_list, new_var);
+	    replace_array_notations (&orig_stmt, false, sub_list, new_var_list);
+	  }	
+      }
+  if (stmt != NULL_TREE)
+    append_to_statement_list (finish_expr_stmt (orig_stmt), &stmt);
+  else
+    stmt = orig_stmt;
+  rank = 0;
+  list_size = 0;
+  array_list = NULL;
+  extract_array_notation_exprs (stmt, true, &array_list);
+  list_size = vec_safe_length (array_list);
+
+  if (!find_rank (EXPR_LOCATION (stmt), stmt, stmt, true, &rank))
+    return error_mark_node;
+  if (rank == 0 || list_size == 0)
+    return stmt;
+  an_loop_info.safe_grow_cleared (rank);
+  an_init = push_stmt_list ();  
+    /* Assign the array notation components to variable so that they can satisfy
+     the exec-once rule.  */
+  for (ii = 0; ii < list_size; ii++)
+    {
+      tree array_node = (*array_list)[ii];
+      make_triplet_val_inv (&ARRAY_NOTATION_START (array_node));
+      make_triplet_val_inv (&ARRAY_NOTATION_LENGTH (array_node));
+      make_triplet_val_inv (&ARRAY_NOTATION_STRIDE (array_node));
+    }
+  cilkplus_extract_an_triplets (array_list, list_size, rank, &an_info);
+  
+  for (ii = 0; ii < rank; ii++)
+    {
+      tree typ = ptrdiff_type_node;
+      an_loop_info[ii].var = create_temporary_var (typ);
+      add_decl_expr (an_loop_info[ii].var);
+      an_loop_info[ii].ind_init = build_x_modify_expr
+	(location, an_loop_info[ii].var, INIT_EXPR, build_zero_cst (typ), 
+	 tf_warning_or_error);
+    }
+  array_operand = create_array_refs (location, an_info, an_loop_info,
+				     list_size, rank);
+  replace_array_notations (&stmt, true, array_list, array_operand);
+  create_cmp_incr (location, &an_loop_info, rank, an_info, tf_warning_or_error);
+  
+  an_init = pop_stmt_list (an_init);
+  append_to_statement_list (an_init, &loop_with_init);
+  body = stmt;
+  
+  for (ii = 0; ii < rank; ii++)
+    {
+      tree new_loop = push_stmt_list ();
+      create_an_loop (an_loop_info[ii].ind_init, an_loop_info[ii].cmp,
+		      an_loop_info[ii].incr, body);
+      body = pop_stmt_list (new_loop);
+    }
+  append_to_statement_list (body, &loop_with_init);
+
+  release_vec_vec (an_info);
+
+  return loop_with_init;
+}
+
+/* Expands the array notation's builtin reduction function in EXPR
+   (of type RETURN_EXPR) and returns a STATEMENT_LIST that contains a loop
+   with the builtin function expansion and a return statement at the end.  */
+
+static tree
+expand_return_expr (tree expr)
+{
+  tree new_mod_list, new_var, new_mod, retval_expr;
+  size_t rank  = 0;
+  location_t loc = EXPR_LOCATION (expr);
+  if (TREE_CODE (expr) != RETURN_EXPR)
+    return expr;
+      
+  if (!find_rank (loc, expr, expr, false, &rank))
+    return error_mark_node;
+
+  /* If the return expression contains array notations, then flag it as
+     error.  */
+  if (rank >= 1)
+    {
+      error_at (loc, "array notation expression cannot be used as a return "
+		"value");
+      return error_mark_node;
+    }
+  
+  new_mod_list = push_stmt_list ();
+  retval_expr = TREE_OPERAND (expr, 0);
+  new_var = create_temporary_var (TREE_TYPE (retval_expr));
+  add_decl_expr (new_var);
+  new_mod = expand_an_in_modify_expr (loc, new_var, NOP_EXPR,
+				      TREE_OPERAND (retval_expr, 1),
+				      tf_warning_or_error);
+  TREE_OPERAND (retval_expr, 1) = new_var;
+  TREE_OPERAND (expr, 0) = retval_expr;
+  add_stmt (new_mod);
+  add_stmt (expr);
+  new_mod_list = pop_stmt_list (new_mod_list);
+  return new_mod_list;
+}
+
+/* Expands ARRAY_NOTATION_REF and builtin functions in a compound statement,
+   STMT. Returns the STMT with expanded array notations.  */
+
+tree
+expand_array_notation_exprs (tree t)
+{
+  enum tree_code code;
+  bool is_expr;
+  location_t loc = UNKNOWN_LOCATION;
+  
+  if (!t)
+    return t;
+
+  loc = EXPR_LOCATION (t);
+
+  code = TREE_CODE (t); 
+  is_expr = IS_EXPR_CODE_CLASS (TREE_CODE_CLASS (code));
+  switch (code)
+    {
+    case ERROR_MARK:
+    case IDENTIFIER_NODE:
+    case VOID_CST:
+    case INTEGER_CST:
+    case REAL_CST:
+    case FIXED_CST:
+    case STRING_CST:
+    case BLOCK:
+    case PLACEHOLDER_EXPR:
+    case FIELD_DECL:
+    case VOID_TYPE:
+    case REAL_TYPE:
+    case SSA_NAME:
+    case LABEL_DECL:
+    case RESULT_DECL:
+    case VAR_DECL:
+    case PARM_DECL:
+    case NON_LVALUE_EXPR:
+    case NOP_EXPR:
+    case ADDR_EXPR:
+    case ARRAY_REF:
+    case BIT_FIELD_REF:
+    case VECTOR_CST:
+    case COMPLEX_CST:
+      return t;
+    case INIT_EXPR:
+    case MODIFY_EXPR:
+      if (contains_array_notation_expr (t))
+	t = expand_an_in_modify_expr (loc, TREE_OPERAND (t, 0), NOP_EXPR, 
+					 TREE_OPERAND (t, 1), 
+					 tf_warning_or_error);
+      return t;
+    case MODOP_EXPR:
+      if (contains_array_notation_expr (t) && !processing_template_decl)
+	t = expand_an_in_modify_expr
+	  (loc, TREE_OPERAND (t, 0), TREE_CODE (TREE_OPERAND (t, 1)),
+	   TREE_OPERAND (t, 2), tf_warning_or_error);
+      return t;
+    case CONSTRUCTOR:
+      return t;
+    case BIND_EXPR:
+      {
+	BIND_EXPR_BODY (t) =
+	  expand_array_notation_exprs  (BIND_EXPR_BODY (t));
+	return t;
+      }
+    case DECL_EXPR:
+      if (contains_array_notation_expr (t))
+	{
+	  tree x = DECL_EXPR_DECL (t);
+	  if (DECL_INITIAL (x))
+	    {
+	      location_t loc = DECL_SOURCE_LOCATION (x);
+	      tree lhs = x;
+	      tree rhs = DECL_INITIAL (x);
+	      DECL_INITIAL (x) = NULL;
+	      tree new_modify_expr = build_modify_expr (loc, lhs,
+							TREE_TYPE (lhs),
+							NOP_EXPR,
+							loc, rhs,
+							TREE_TYPE(rhs));
+	      t = expand_array_notation_exprs (new_modify_expr);
+	    }
+	}
+      return t;
+    case STATEMENT_LIST:
+      {
+	tree_stmt_iterator i;
+	for (i = tsi_start (t); !tsi_end_p (i); tsi_next (&i))
+	  *tsi_stmt_ptr (i) =
+	    expand_array_notation_exprs (*tsi_stmt_ptr (i));
+	return t;
+      }
+
+    case OMP_PARALLEL:
+      OMP_PARALLEL_BODY (t)
+	= expand_array_notation_exprs (OMP_PARALLEL_BODY (t));
+      return t;
+
+    case OMP_TASK:
+    case OMP_FOR:
+    case OMP_SINGLE:
+    case OMP_SECTION:
+    case OMP_SECTIONS:
+    case OMP_MASTER:
+    case OMP_TASKGROUP:
+    case OMP_ORDERED:
+    case OMP_CRITICAL:
+    case OMP_ATOMIC:
+    case OMP_CLAUSE:
+    case TARGET_EXPR:
+    case INTEGER_TYPE:
+    case ENUMERAL_TYPE:
+    case BOOLEAN_TYPE:
+    case POINTER_TYPE:
+    case ARRAY_TYPE:
+    case RECORD_TYPE:
+    case METHOD_TYPE:
+      return t;
+    case RETURN_EXPR:
+      if (contains_array_notation_expr (t))
+	t = expand_return_expr (t);
+      return t;
+    case PREDECREMENT_EXPR:
+    case PREINCREMENT_EXPR:
+    case POSTDECREMENT_EXPR:
+    case POSTINCREMENT_EXPR:
+    case AGGR_INIT_EXPR:
+    case CALL_EXPR:
+      t = expand_unary_array_notation_exprs (t);
+      return t;
+    case CONVERT_EXPR:
+    case CLEANUP_POINT_EXPR:
+    case EXPR_STMT:
+      TREE_OPERAND (t, 0) = expand_array_notation_exprs (TREE_OPERAND (t, 0));
+      /* It is not necessary to wrap error_mark_node in EXPR_STMT.  */
+      if (TREE_OPERAND (t, 0) == error_mark_node)
+	return TREE_OPERAND (t, 0); 
+      return t;
+    case TRUTH_ANDIF_EXPR:
+    case TRUTH_ORIF_EXPR:
+    case TRUTH_AND_EXPR:
+    case TRUTH_OR_EXPR:
+    case TRUTH_XOR_EXPR:
+    case TRUTH_NOT_EXPR:
+    case COND_EXPR:
+      t = cp_expand_cond_array_notations (t);
+      if (TREE_CODE (t) == COND_EXPR)
+	{
+	  COND_EXPR_THEN (t) =
+	    expand_array_notation_exprs (COND_EXPR_THEN (t));
+	  COND_EXPR_ELSE (t) =
+	    expand_array_notation_exprs (COND_EXPR_ELSE (t));
+	}
+      return t;
+    case FOR_STMT:
+      if (contains_array_notation_expr (FOR_COND (t)))
+	{
+	  error_at (EXPR_LOCATION (FOR_COND (t)),
+		    "array notation cannot be used in a condition for "
+		    "a for-loop");
+	  return error_mark_node;
+	}
+      /* FIXME: Add a check for CILK_FOR_STMT here when we add Cilk tasking 
+	 keywords.  */
+      if (TREE_CODE (t) == FOR_STMT)
+	{ 
+	  FOR_BODY (t) = expand_array_notation_exprs (FOR_BODY (t));
+	  FOR_EXPR (t) = expand_array_notation_exprs (FOR_EXPR (t));
+	}
+      else
+	t = expand_array_notation_exprs (t);
+      return t;
+    case IF_STMT:
+      t = cp_expand_cond_array_notations (t);
+      /* If the above function added some extra instructions above the original
+	 if statement, then we can't assume it is still IF_STMT so we have to
+	 check again.  */
+      if (TREE_CODE (t) == IF_STMT)
+	{
+	  if (THEN_CLAUSE (t))
+	    THEN_CLAUSE (t) = expand_array_notation_exprs (THEN_CLAUSE (t));
+	  if (ELSE_CLAUSE (t))
+	    ELSE_CLAUSE (t) = expand_array_notation_exprs (ELSE_CLAUSE (t));
+	}
+      else
+	t = expand_array_notation_exprs (t);
+      return t;
+    case SWITCH_STMT:
+      if (contains_array_notation_expr (SWITCH_STMT_COND (t)))
+	{
+	  error_at (EXPR_LOCATION (SWITCH_STMT_COND (t)),
+		    "array notation cannot be used as a condition for "
+		    "switch statement");
+	  return error_mark_node;
+	}
+      if (SWITCH_STMT_BODY (t))
+	SWITCH_STMT_BODY (t) =
+	  expand_array_notation_exprs (SWITCH_STMT_BODY (t));
+      return t;
+    case WHILE_STMT:
+      if (contains_array_notation_expr (WHILE_COND (t)))
+	{
+	  if (EXPR_LOCATION (WHILE_COND (t)) != UNKNOWN_LOCATION)
+	    loc = EXPR_LOCATION (WHILE_COND (t));
+	  error_at (loc, "array notation cannot be used as a condition for "
+		    "while statement");
+	  return error_mark_node;
+	}
+      if (WHILE_BODY (t))
+	WHILE_BODY (t) = expand_array_notation_exprs (WHILE_BODY (t));
+      return t;
+    case DO_STMT:
+      if (contains_array_notation_expr (DO_COND (t)))
+	{
+	  error_at (EXPR_LOCATION (DO_COND (t)),
+		    "array notation cannot be used as a condition for a "
+		    "do-while statement");
+	  return error_mark_node;
+	}
+      if (DO_BODY (t))
+	DO_BODY (t) = expand_array_notation_exprs (DO_BODY (t));
+      return t;
+    default:
+      if (is_expr)
+	{
+	  int i, len;
+
+	  /* Walk over all the sub-trees of this operand.  */
+	  len = TREE_CODE_LENGTH (code);
+
+	  /* Go through the subtrees.  We need to do this in forward order so
+	     that the scope of a FOR_EXPR is handled properly.  */
+	  for (i = 0; i < len; ++i)
+	    TREE_OPERAND (t, i) =
+	      expand_array_notation_exprs (TREE_OPERAND (t, i));
+	}
+      return t;
+    }
+  return t;
+}
+
+/* Given the base of an array (ARRAY), the START (start_index), the number of 
+   elements to be accessed (LENGTH) and the STRIDE, construct an 
+   ARRAY_NOTATION_REF tree of type TYPE and return it.  Restrictions on START, 
+   LENGTH and STRIDE are the same as that of index field passed into ARRAY_REF. 
+   The only additional restriction is that, unlike index in ARRAY_REF, stride, 
+   length and start_index cannot contain array notations.  */
+
+tree
+build_array_notation_ref (location_t loc, tree array, tree start, tree length, 
+			  tree stride, tree type)
+{
+  tree array_ntn_expr = NULL_TREE;
+
+  /* If we enter the then-case of the if-statement below, we have hit a case 
+     like this: ARRAY [:].  */
+  if (!start && !length)
+    {
+      if (TREE_CODE (type) != ARRAY_TYPE)
+	{
+	  error_at (loc, "start-index and length fields necessary for "
+		    "using array notation in pointers or records");
+	  return error_mark_node;
+	}
+      tree domain = TYPE_DOMAIN (type);
+      if (!domain)
+	{
+	  error_at (loc, "start-index and length fields necessary for "
+		    "using array notation with array of unknown bound");
+	  return error_mark_node;
+	}
+      start = cp_fold_convert (ptrdiff_type_node, TYPE_MIN_VALUE (domain));
+      length = size_binop (PLUS_EXPR, TYPE_MAX_VALUE (domain), size_one_node);
+      length = cp_fold_convert (ptrdiff_type_node, length);
+    }
+    
+  if (!stride) 
+    stride = build_one_cst (ptrdiff_type_node);
+
+  stride = maybe_constant_value (stride);
+  length = maybe_constant_value (length);
+  if (start)
+    start = maybe_constant_value (start);
+
+  /* When dealing with templates, triplet type-checking will be done in pt.c 
+     after type substitution.  */
+  if (processing_template_decl 
+      && (type_dependent_expression_p (array) 
+	  || type_dependent_expression_p (length) 
+	  || type_dependent_expression_p (start) 
+	  || type_dependent_expression_p (stride))) 
+    array_ntn_expr = build_min_nt_loc (loc, ARRAY_NOTATION_REF, array, start, 
+				       length, stride, NULL_TREE);
+  else 
+    { 
+      if (!cilkplus_an_triplet_types_ok_p (loc, start, length, stride, type))
+	return error_mark_node;
+      array_ntn_expr = build4 (ARRAY_NOTATION_REF, NULL_TREE, array, start, 
+			       length, stride);
+    }
+  if (TREE_CODE (type) == ARRAY_TYPE || TREE_CODE (type) == POINTER_TYPE)
+    TREE_TYPE (array_ntn_expr) = TREE_TYPE (type);
+  else
+    {
+      error_at (loc, "base of array section must be pointer or array type");
+      return error_mark_node;
+    }
+
+  SET_EXPR_LOCATION (array_ntn_expr, loc);
+  return array_ntn_expr;
+}
+
+/* Returns false if any of the Array notation triplet values: START_INDEX,
+   LENGTH and STRIDE, are not of integral type and have a rank greater than
+   zero.  */
+
+bool
+cilkplus_an_triplet_types_ok_p (location_t loc, tree start_index, tree length,
+				tree stride, tree type)
+{
+  size_t stride_rank = 0, length_rank = 0, start_rank = 0;
+  if (!TREE_TYPE (start_index) || !INTEGRAL_TYPE_P (TREE_TYPE (start_index)))
+    {
+      error_at (loc, "start-index of array notation triplet is not an integer");
+      return false;
+    }
+  if (!TREE_TYPE (length) || !INTEGRAL_TYPE_P (TREE_TYPE (length)))
+    {
+      error_at (loc, "length of array notation triplet is not an integer");
+      return false;
+    }
+  if (!TREE_TYPE (stride) || !INTEGRAL_TYPE_P (TREE_TYPE (stride)))
+    {
+      error_at (loc, "stride of array notation triplet is not an integer");
+      return false;
+    }
+  if (TREE_CODE (type) == FUNCTION_TYPE)
+    {
+      error_at (loc, "array notation cannot be used with function type");
+      return false;
+    }
+  if (!find_rank (loc, start_index, start_index, false, &start_rank)
+      || !find_rank (loc, length, length, false, &length_rank)
+      || !find_rank (loc, stride, stride, false, &stride_rank))
+    return false;
+
+  if (start_rank != 0)
+    {
+      error_at (loc, "rank of an array notation triplet%'s start-index is not "
+		"zero");
+      return false;
+    }
+  if (length_rank != 0)
+    {
+      error_at (loc, "rank of an array notation triplet%'s length is not zero");
+      return false;
+    }
+  if (stride_rank != 0)
+    {
+      error_at (loc, "rank of array notation triplet%'s stride is not zero");
+      return false;
+    }
+  return true;
+}