Remove symbol replacement

pystencils/transformations.py

@@ -607,13 +607,7 @@ def move_constants_before_loop(ast_node):
     get_blocks(ast_node, all_blocks)
     for block in all_blocks:
         children = block.take_child_nodes()
-        # Every time a symbol can be replaced in the current block because the assignment
-        # was found in a parent block, but with a different lhs symbol (same rhs)
-        # the outer symbol is inserted here as key.
-        substitute_variables = {}
         for child in children:
-            # Before traversing the next child, all symbols are substituted first.
-            child.subs(substitute_variables)
 
             if not isinstance(child, ast.SympyAssignment):  # only move SympyAssignments
                 block.append(child)
@@ -629,14 +623,7 @@ def move_constants_before_loop(ast_node):
                     exists_already = False
 
                 if not exists_already:
-                    rhs_identical = check_if_assignment_already_in_block(child, target, True)
-                    if rhs_identical:
-                        # there is already an assignment out there with the same rhs
-                        # -> replace all lhs symbols in this block with the lhs of the outer assignment
-                        # -> remove the local assignment (do not re-append child to the former block)
-                        substitute_variables[child.lhs] = rhs_identical.lhs
-                    else:
-                        target.insert_before(child, child_to_insert_before)
+                    target.insert_before(child, child_to_insert_before)
                 elif exists_already and exists_already.rhs == child.rhs:
                     if target.args.index(exists_already) > target.args.index(child_to_insert_before):
                         assert target.args.count(exists_already) == 1
@@ -650,7 +637,6 @@ def move_constants_before_loop(ast_node):
                     new_symbol = TypedSymbol(sp.Dummy().name, child.lhs.dtype)
                     target.insert_before(ast.SympyAssignment(new_symbol, child.rhs, is_const=child.is_const),
                                          child_to_insert_before)
-                    substitute_variables[child.lhs] = new_symbol
 
 
 def split_inner_loop(ast_node: ast.Node, symbol_groups):