1 /*
   2  * Copyright (c) 2006, 2008, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "incls/_precompiled.incl"
  26 #include "incls/_loopUnswitch.cpp.incl"



  27 
  28 //================= Loop Unswitching =====================
  29 //
  30 // orig:                       transformed:
  31 //                               if (invariant-test) then
  32 //  loop                           loop
  33 //    stmt1                          stmt1
  34 //    if (invariant-test) then       stmt2
  35 //      stmt2                        stmt4
  36 //    else                         endloop
  37 //      stmt3                    else
  38 //    endif                        loop [clone]
  39 //    stmt4                          stmt1 [clone]
  40 //  endloop                          stmt3
  41 //                                   stmt4 [clone]
  42 //                                 endloop
  43 //                               endif
  44 //
  45 // Note: the "else" clause may be empty
  46 

   1 /*
   2  * Copyright (c) 2006, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "memory/allocation.inline.hpp"
  27 #include "opto/connode.hpp"
  28 #include "opto/loopnode.hpp"
  29 #include "opto/rootnode.hpp"
  30 
  31 //================= Loop Unswitching =====================
  32 //
  33 // orig:                       transformed:
  34 //                               if (invariant-test) then
  35 //  loop                           loop
  36 //    stmt1                          stmt1
  37 //    if (invariant-test) then       stmt2
  38 //      stmt2                        stmt4
  39 //    else                         endloop
  40 //      stmt3                    else
  41 //    endif                        loop [clone]
  42 //    stmt4                          stmt1 [clone]
  43 //  endloop                          stmt3
  44 //                                   stmt4 [clone]
  45 //                                 endloop
  46 //                               endif
  47 //
  48 // Note: the "else" clause may be empty
  49