hotspot/src/share/vm/opto/loopPredicate.cpp
author drchase
Fri, 09 May 2014 16:50:54 -0400
changeset 24424 2658d7834c6e
parent 23528 8f1a7f5e8066
child 24923 9631f7d691dc
permissions -rw-r--r--
8037816: Fix for 8036122 breaks build with Xcode5/clang Summary: Repaired or selectively disabled offending formats; future-proofed with additional checking Reviewed-by: kvn, jrose, stefank
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/*
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 * Copyright (c) 2011, 2014, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "opto/loopnode.hpp"
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#include "opto/addnode.hpp"
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#include "opto/callnode.hpp"
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#include "opto/connode.hpp"
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#include "opto/convertnode.hpp"
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#include "opto/loopnode.hpp"
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#include "opto/mulnode.hpp"
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#include "opto/opaquenode.hpp"
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#include "opto/rootnode.hpp"
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#include "opto/subnode.hpp"
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/*
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 * The general idea of Loop Predication is to insert a predicate on the entry
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 * path to a loop, and raise a uncommon trap if the check of the condition fails.
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 * The condition checks are promoted from inside the loop body, and thus
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 * the checks inside the loop could be eliminated. Currently, loop predication
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 * optimization has been applied to remove array range check and loop invariant
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 * checks (such as null checks).
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*/
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//-------------------------------register_control-------------------------
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void PhaseIdealLoop::register_control(Node* n, IdealLoopTree *loop, Node* pred) {
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  assert(n->is_CFG(), "must be control node");
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  _igvn.register_new_node_with_optimizer(n);
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  loop->_body.push(n);
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  set_loop(n, loop);
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  // When called from beautify_loops() idom is not constructed yet.
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  if (_idom != NULL) {
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    set_idom(n, pred, dom_depth(pred));
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  }
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}
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//------------------------------create_new_if_for_predicate------------------------
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// create a new if above the uct_if_pattern for the predicate to be promoted.
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//
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//          before                                after
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//        ----------                           ----------
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//           ctrl                                 ctrl
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//            |                                     |
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//            |                                     |
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//            v                                     v
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//           iff                                 new_iff
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//          /    \                                /      \
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//         /      \                              /        \
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//        v        v                            v          v
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//  uncommon_proj cont_proj                   if_uct     if_cont
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// \      |        |                           |          |
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//  \     |        |                           |          |
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//   v    v        v                           |          v
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//     rgn       loop                          |         iff
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//      |                                      |        /     \
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//      |                                      |       /       \
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//      v                                      |      v         v
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// uncommon_trap                               | uncommon_proj cont_proj
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//                                           \  \    |           |
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//                                            \  \   |           |
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//                                             v  v  v           v
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//                                               rgn           loop
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//                                                |
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//                                                |
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//                                                v
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//                                           uncommon_trap
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//
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//
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// We will create a region to guard the uct call if there is no one there.
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// The true projecttion (if_cont) of the new_iff is returned.
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// This code is also used to clone predicates to clonned loops.
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ProjNode* PhaseIdealLoop::create_new_if_for_predicate(ProjNode* cont_proj, Node* new_entry,
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                                                      Deoptimization::DeoptReason reason) {
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  assert(cont_proj->is_uncommon_trap_if_pattern(reason), "must be a uct if pattern!");
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  IfNode* iff = cont_proj->in(0)->as_If();
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  ProjNode *uncommon_proj = iff->proj_out(1 - cont_proj->_con);
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  Node     *rgn   = uncommon_proj->unique_ctrl_out();
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  assert(rgn->is_Region() || rgn->is_Call(), "must be a region or call uct");
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  uint proj_index = 1; // region's edge corresponding to uncommon_proj
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  if (!rgn->is_Region()) { // create a region to guard the call
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    assert(rgn->is_Call(), "must be call uct");
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    CallNode* call = rgn->as_Call();
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    IdealLoopTree* loop = get_loop(call);
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    rgn = new (C) RegionNode(1);
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    rgn->add_req(uncommon_proj);
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    register_control(rgn, loop, uncommon_proj);
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    _igvn.hash_delete(call);
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    call->set_req(0, rgn);
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    // When called from beautify_loops() idom is not constructed yet.
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    if (_idom != NULL) {
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      set_idom(call, rgn, dom_depth(rgn));
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    }
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  } else {
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    // Find region's edge corresponding to uncommon_proj
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    for (; proj_index < rgn->req(); proj_index++)
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      if (rgn->in(proj_index) == uncommon_proj) break;
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    assert(proj_index < rgn->req(), "sanity");
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  }
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  Node* entry = iff->in(0);
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  if (new_entry != NULL) {
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    // Clonning the predicate to new location.
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    entry = new_entry;
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  }
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  // Create new_iff
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  IdealLoopTree* lp = get_loop(entry);
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  IfNode *new_iff = iff->clone()->as_If();
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  new_iff->set_req(0, entry);
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  register_control(new_iff, lp, entry);
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  Node *if_cont = new (C) IfTrueNode(new_iff);
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  Node *if_uct  = new (C) IfFalseNode(new_iff);
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  if (cont_proj->is_IfFalse()) {
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    // Swap
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    Node* tmp = if_uct; if_uct = if_cont; if_cont = tmp;
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  }
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  register_control(if_cont, lp, new_iff);
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  register_control(if_uct, get_loop(rgn), new_iff);
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  // if_uct to rgn
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  _igvn.hash_delete(rgn);
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  rgn->add_req(if_uct);
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  // When called from beautify_loops() idom is not constructed yet.
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  if (_idom != NULL) {
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    Node* ridom = idom(rgn);
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    Node* nrdom = dom_lca(ridom, new_iff);
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    set_idom(rgn, nrdom, dom_depth(rgn));
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  }
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  // If rgn has phis add new edges which has the same
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  // value as on original uncommon_proj pass.
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  assert(rgn->in(rgn->req() -1) == if_uct, "new edge should be last");
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  bool has_phi = false;
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  for (DUIterator_Fast imax, i = rgn->fast_outs(imax); i < imax; i++) {
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    Node* use = rgn->fast_out(i);
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    if (use->is_Phi() && use->outcnt() > 0) {
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      assert(use->in(0) == rgn, "");
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      _igvn.rehash_node_delayed(use);
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      use->add_req(use->in(proj_index));
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      has_phi = true;
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    }
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  }
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  assert(!has_phi || rgn->req() > 3, "no phis when region is created");
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  if (new_entry == NULL) {
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    // Attach if_cont to iff
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    _igvn.hash_delete(iff);
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    iff->set_req(0, if_cont);
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    if (_idom != NULL) {
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      set_idom(iff, if_cont, dom_depth(iff));
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    }
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  }
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  return if_cont->as_Proj();
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}
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//------------------------------create_new_if_for_predicate------------------------
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// Create a new if below new_entry for the predicate to be cloned (IGVN optimization)
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ProjNode* PhaseIterGVN::create_new_if_for_predicate(ProjNode* cont_proj, Node* new_entry,
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                                                    Deoptimization::DeoptReason reason) {
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  assert(new_entry != 0, "only used for clone predicate");
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  assert(cont_proj->is_uncommon_trap_if_pattern(reason), "must be a uct if pattern!");
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  IfNode* iff = cont_proj->in(0)->as_If();
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  ProjNode *uncommon_proj = iff->proj_out(1 - cont_proj->_con);
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  Node     *rgn   = uncommon_proj->unique_ctrl_out();
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  assert(rgn->is_Region() || rgn->is_Call(), "must be a region or call uct");
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  uint proj_index = 1; // region's edge corresponding to uncommon_proj
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  if (!rgn->is_Region()) { // create a region to guard the call
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    assert(rgn->is_Call(), "must be call uct");
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    CallNode* call = rgn->as_Call();
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    rgn = new (C) RegionNode(1);
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    register_new_node_with_optimizer(rgn);
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    rgn->add_req(uncommon_proj);
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    hash_delete(call);
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    call->set_req(0, rgn);
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  } else {
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    // Find region's edge corresponding to uncommon_proj
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    for (; proj_index < rgn->req(); proj_index++)
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      if (rgn->in(proj_index) == uncommon_proj) break;
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    assert(proj_index < rgn->req(), "sanity");
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  }
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  // Create new_iff in new location.
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  IfNode *new_iff = iff->clone()->as_If();
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  new_iff->set_req(0, new_entry);
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  register_new_node_with_optimizer(new_iff);
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  Node *if_cont = new (C) IfTrueNode(new_iff);
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  Node *if_uct  = new (C) IfFalseNode(new_iff);
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  if (cont_proj->is_IfFalse()) {
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    // Swap
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    Node* tmp = if_uct; if_uct = if_cont; if_cont = tmp;
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  }
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  register_new_node_with_optimizer(if_cont);
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  register_new_node_with_optimizer(if_uct);
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  // if_uct to rgn
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  hash_delete(rgn);
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  rgn->add_req(if_uct);
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  // If rgn has phis add corresponding new edges which has the same
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  // value as on original uncommon_proj pass.
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  assert(rgn->in(rgn->req() -1) == if_uct, "new edge should be last");
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  bool has_phi = false;
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  for (DUIterator_Fast imax, i = rgn->fast_outs(imax); i < imax; i++) {
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    Node* use = rgn->fast_out(i);
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    if (use->is_Phi() && use->outcnt() > 0) {
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      rehash_node_delayed(use);
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      use->add_req(use->in(proj_index));
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      has_phi = true;
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    }
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  }
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  assert(!has_phi || rgn->req() > 3, "no phis when region is created");
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  return if_cont->as_Proj();
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}
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//--------------------------clone_predicate-----------------------
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ProjNode* PhaseIdealLoop::clone_predicate(ProjNode* predicate_proj, Node* new_entry,
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                                          Deoptimization::DeoptReason reason,
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                                          PhaseIdealLoop* loop_phase,
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                                          PhaseIterGVN* igvn) {
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  ProjNode* new_predicate_proj;
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  if (loop_phase != NULL) {
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    new_predicate_proj = loop_phase->create_new_if_for_predicate(predicate_proj, new_entry, reason);
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  } else {
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    new_predicate_proj =       igvn->create_new_if_for_predicate(predicate_proj, new_entry, reason);
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  }
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  IfNode* iff = new_predicate_proj->in(0)->as_If();
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  Node* ctrl  = iff->in(0);
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  // Match original condition since predicate's projections could be swapped.
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  assert(predicate_proj->in(0)->in(1)->in(1)->Opcode()==Op_Opaque1, "must be");
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  Node* opq = new (igvn->C) Opaque1Node(igvn->C, predicate_proj->in(0)->in(1)->in(1)->in(1));
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  igvn->C->add_predicate_opaq(opq);
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  Node* bol = new (igvn->C) Conv2BNode(opq);
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  if (loop_phase != NULL) {
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    loop_phase->register_new_node(opq, ctrl);
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    loop_phase->register_new_node(bol, ctrl);
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  } else {
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    igvn->register_new_node_with_optimizer(opq);
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    igvn->register_new_node_with_optimizer(bol);
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  }
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  igvn->hash_delete(iff);
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  iff->set_req(1, bol);
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  return new_predicate_proj;
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}
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//--------------------------clone_loop_predicates-----------------------
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// Interface from IGVN
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Node* PhaseIterGVN::clone_loop_predicates(Node* old_entry, Node* new_entry, bool clone_limit_check) {
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  return PhaseIdealLoop::clone_loop_predicates(old_entry, new_entry, clone_limit_check, NULL, this);
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}
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// Interface from PhaseIdealLoop
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Node* PhaseIdealLoop::clone_loop_predicates(Node* old_entry, Node* new_entry, bool clone_limit_check) {
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  return clone_loop_predicates(old_entry, new_entry, clone_limit_check, this, &this->_igvn);
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}
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// Clone loop predicates to cloned loops (peeled, unswitched, split_if).
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Node* PhaseIdealLoop::clone_loop_predicates(Node* old_entry, Node* new_entry,
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                                                bool clone_limit_check,
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                                                PhaseIdealLoop* loop_phase,
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                                                PhaseIterGVN* igvn) {
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#ifdef ASSERT
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  if (new_entry == NULL || !(new_entry->is_Proj() || new_entry->is_Region() || new_entry->is_SafePoint())) {
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    if (new_entry != NULL)
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      new_entry->dump();
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    assert(false, "not IfTrue, IfFalse, Region or SafePoint");
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  }
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#endif
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   297
  // Search original predicates
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   298
  Node* entry = old_entry;
9446
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   299
  ProjNode* limit_check_proj = NULL;
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   300
  if (LoopLimitCheck) {
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   301
    limit_check_proj = find_predicate_insertion_point(entry, Deoptimization::Reason_loop_limit_check);
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diff changeset
   302
    if (limit_check_proj != NULL) {
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diff changeset
   303
      entry = entry->in(0)->in(0);
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diff changeset
   304
    }
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   305
  }
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
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   306
  if (UseLoopPredicate) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
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   307
    ProjNode* predicate_proj = find_predicate_insertion_point(entry, Deoptimization::Reason_predicate);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
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   308
    if (predicate_proj != NULL) { // right pattern that can be used by loop predication
10258
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
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parents: 10253
diff changeset
   309
      // clone predicate
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
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diff changeset
   310
      new_entry = clone_predicate(predicate_proj, new_entry,
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
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parents: 10253
diff changeset
   311
                                  Deoptimization::Reason_predicate,
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
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   312
                                  loop_phase, igvn);
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
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   313
      assert(new_entry != NULL && new_entry->is_Proj(), "IfTrue or IfFalse after clone predicate");
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
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   314
      if (TraceLoopPredicate) {
10258
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
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diff changeset
   315
        tty->print("Loop Predicate cloned: ");
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
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   316
        debug_only( new_entry->in(0)->dump(); )
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
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parents:
diff changeset
   317
      }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
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diff changeset
   318
    }
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kvn
parents:
diff changeset
   319
  }
9446
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diff changeset
   320
  if (limit_check_proj != NULL && clone_limit_check) {
748a37b25d10 5091921: Sign flip issues in loop optimizer
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diff changeset
   321
    // Clone loop limit check last to insert it before loop.
748a37b25d10 5091921: Sign flip issues in loop optimizer
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diff changeset
   322
    // Don't clone a limit check which was already finalized
748a37b25d10 5091921: Sign flip issues in loop optimizer
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diff changeset
   323
    // for this counted loop (only one limit check is needed).
10258
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
diff changeset
   324
    new_entry = clone_predicate(limit_check_proj, new_entry,
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
diff changeset
   325
                                Deoptimization::Reason_loop_limit_check,
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
diff changeset
   326
                                loop_phase, igvn);
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
diff changeset
   327
    assert(new_entry != NULL && new_entry->is_Proj(), "IfTrue or IfFalse after clone limit check");
9446
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kvn
parents: 9437
diff changeset
   328
    if (TraceLoopLimitCheck) {
10258
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
diff changeset
   329
      tty->print("Loop Limit Check cloned: ");
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
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diff changeset
   330
      debug_only( new_entry->in(0)->dump(); )
748a37b25d10 5091921: Sign flip issues in loop optimizer
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parents: 9437
diff changeset
   331
    }
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kvn
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diff changeset
   332
  }
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   333
  return new_entry;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   334
}
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   335
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   336
//--------------------------skip_loop_predicates------------------------------
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kvn
parents:
diff changeset
   337
// Skip related predicates.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   338
Node* PhaseIdealLoop::skip_loop_predicates(Node* entry) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   339
  Node* predicate = NULL;
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
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diff changeset
   340
  if (LoopLimitCheck) {
748a37b25d10 5091921: Sign flip issues in loop optimizer
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diff changeset
   341
    predicate = find_predicate_insertion_point(entry, Deoptimization::Reason_loop_limit_check);
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diff changeset
   342
    if (predicate != NULL) {
748a37b25d10 5091921: Sign flip issues in loop optimizer
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parents: 9437
diff changeset
   343
      entry = entry->in(0)->in(0);
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diff changeset
   344
    }
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diff changeset
   345
  }
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   346
  if (UseLoopPredicate) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   347
    predicate = find_predicate_insertion_point(entry, Deoptimization::Reason_predicate);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   348
    if (predicate != NULL) { // right pattern that can be used by loop predication
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   349
      IfNode* iff = entry->in(0)->as_If();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   350
      ProjNode* uncommon_proj = iff->proj_out(1 - entry->as_Proj()->_con);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   351
      Node* rgn = uncommon_proj->unique_ctrl_out();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   352
      assert(rgn->is_Region() || rgn->is_Call(), "must be a region or call uct");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   353
      entry = entry->in(0)->in(0);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   354
      while (entry != NULL && entry->is_Proj() && entry->in(0)->is_If()) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   355
        uncommon_proj = entry->in(0)->as_If()->proj_out(1 - entry->as_Proj()->_con);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   356
        if (uncommon_proj->unique_ctrl_out() != rgn)
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   357
          break;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   358
        entry = entry->in(0)->in(0);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   359
      }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   360
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   361
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   362
  return entry;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   363
}
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   364
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   365
//--------------------------find_predicate_insertion_point-------------------
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   366
// Find a good location to insert a predicate
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   367
ProjNode* PhaseIdealLoop::find_predicate_insertion_point(Node* start_c, Deoptimization::DeoptReason reason) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   368
  if (start_c == NULL || !start_c->is_Proj())
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   369
    return NULL;
21089
e1986ff6fe2e 8024069: replace_in_map() should operate on parent maps
roland
parents: 17383
diff changeset
   370
  if (start_c->as_Proj()->is_uncommon_trap_if_pattern(reason)) {
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   371
    return start_c->as_Proj();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   372
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   373
  return NULL;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   374
}
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   375
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   376
//--------------------------find_predicate------------------------------------
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   377
// Find a predicate
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   378
Node* PhaseIdealLoop::find_predicate(Node* entry) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   379
  Node* predicate = NULL;
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   380
  if (LoopLimitCheck) {
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   381
    predicate = find_predicate_insertion_point(entry, Deoptimization::Reason_loop_limit_check);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   382
    if (predicate != NULL) { // right pattern that can be used by loop predication
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   383
      return entry;
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   384
    }
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   385
  }
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   386
  if (UseLoopPredicate) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   387
    predicate = find_predicate_insertion_point(entry, Deoptimization::Reason_predicate);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   388
    if (predicate != NULL) { // right pattern that can be used by loop predication
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   389
      return entry;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   390
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   391
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   392
  return NULL;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   393
}
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   394
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   395
//------------------------------Invariance-----------------------------------
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   396
// Helper class for loop_predication_impl to compute invariance on the fly and
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   397
// clone invariants.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   398
class Invariance : public StackObj {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   399
  VectorSet _visited, _invariant;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   400
  Node_Stack _stack;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   401
  VectorSet _clone_visited;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   402
  Node_List _old_new; // map of old to new (clone)
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   403
  IdealLoopTree* _lpt;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   404
  PhaseIdealLoop* _phase;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   405
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   406
  // Helper function to set up the invariance for invariance computation
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   407
  // If n is a known invariant, set up directly. Otherwise, look up the
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   408
  // the possibility to push n onto the stack for further processing.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   409
  void visit(Node* use, Node* n) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   410
    if (_lpt->is_invariant(n)) { // known invariant
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   411
      _invariant.set(n->_idx);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   412
    } else if (!n->is_CFG()) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   413
      Node *n_ctrl = _phase->ctrl_or_self(n);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   414
      Node *u_ctrl = _phase->ctrl_or_self(use); // self if use is a CFG
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   415
      if (_phase->is_dominator(n_ctrl, u_ctrl)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   416
        _stack.push(n, n->in(0) == NULL ? 1 : 0);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   417
      }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   418
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   419
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   420
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   421
  // Compute invariance for "the_node" and (possibly) all its inputs recursively
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   422
  // on the fly
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   423
  void compute_invariance(Node* n) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   424
    assert(_visited.test(n->_idx), "must be");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   425
    visit(n, n);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   426
    while (_stack.is_nonempty()) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   427
      Node*  n = _stack.node();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   428
      uint idx = _stack.index();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   429
      if (idx == n->req()) { // all inputs are processed
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   430
        _stack.pop();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   431
        // n is invariant if it's inputs are all invariant
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   432
        bool all_inputs_invariant = true;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   433
        for (uint i = 0; i < n->req(); i++) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   434
          Node* in = n->in(i);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   435
          if (in == NULL) continue;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   436
          assert(_visited.test(in->_idx), "must have visited input");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   437
          if (!_invariant.test(in->_idx)) { // bad guy
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   438
            all_inputs_invariant = false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   439
            break;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   440
          }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   441
        }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   442
        if (all_inputs_invariant) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   443
          _invariant.set(n->_idx); // I am a invariant too
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   444
        }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   445
      } else { // process next input
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   446
        _stack.set_index(idx + 1);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   447
        Node* m = n->in(idx);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   448
        if (m != NULL && !_visited.test_set(m->_idx)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   449
          visit(n, m);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   450
        }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   451
      }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   452
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   453
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   454
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   455
  // Helper function to set up _old_new map for clone_nodes.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   456
  // If n is a known invariant, set up directly ("clone" of n == n).
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   457
  // Otherwise, push n onto the stack for real cloning.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   458
  void clone_visit(Node* n) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   459
    assert(_invariant.test(n->_idx), "must be invariant");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   460
    if (_lpt->is_invariant(n)) { // known invariant
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   461
      _old_new.map(n->_idx, n);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   462
    } else { // to be cloned
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   463
      assert(!n->is_CFG(), "should not see CFG here");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   464
      _stack.push(n, n->in(0) == NULL ? 1 : 0);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   465
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   466
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   467
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   468
  // Clone "n" and (possibly) all its inputs recursively
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   469
  void clone_nodes(Node* n, Node* ctrl) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   470
    clone_visit(n);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   471
    while (_stack.is_nonempty()) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   472
      Node*  n = _stack.node();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   473
      uint idx = _stack.index();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   474
      if (idx == n->req()) { // all inputs processed, clone n!
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   475
        _stack.pop();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   476
        // clone invariant node
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   477
        Node* n_cl = n->clone();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   478
        _old_new.map(n->_idx, n_cl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   479
        _phase->register_new_node(n_cl, ctrl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   480
        for (uint i = 0; i < n->req(); i++) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   481
          Node* in = n_cl->in(i);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   482
          if (in == NULL) continue;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   483
          n_cl->set_req(i, _old_new[in->_idx]);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   484
        }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   485
      } else { // process next input
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   486
        _stack.set_index(idx + 1);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   487
        Node* m = n->in(idx);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   488
        if (m != NULL && !_clone_visited.test_set(m->_idx)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   489
          clone_visit(m); // visit the input
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   490
        }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   491
      }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   492
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   493
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   494
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   495
 public:
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   496
  Invariance(Arena* area, IdealLoopTree* lpt) :
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   497
    _lpt(lpt), _phase(lpt->_phase),
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   498
    _visited(area), _invariant(area), _stack(area, 10 /* guess */),
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   499
    _clone_visited(area), _old_new(area)
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   500
  {}
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   501
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   502
  // Map old to n for invariance computation and clone
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   503
  void map_ctrl(Node* old, Node* n) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   504
    assert(old->is_CFG() && n->is_CFG(), "must be");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   505
    _old_new.map(old->_idx, n); // "clone" of old is n
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   506
    _invariant.set(old->_idx);  // old is invariant
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   507
    _clone_visited.set(old->_idx);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   508
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   509
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   510
  // Driver function to compute invariance
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   511
  bool is_invariant(Node* n) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   512
    if (!_visited.test_set(n->_idx))
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   513
      compute_invariance(n);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   514
    return (_invariant.test(n->_idx) != 0);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   515
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   516
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   517
  // Driver function to clone invariant
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   518
  Node* clone(Node* n, Node* ctrl) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   519
    assert(ctrl->is_CFG(), "must be");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   520
    assert(_invariant.test(n->_idx), "must be an invariant");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   521
    if (!_clone_visited.test(n->_idx))
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   522
      clone_nodes(n, ctrl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   523
    return _old_new[n->_idx];
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   524
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   525
};
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   526
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   527
//------------------------------is_range_check_if -----------------------------------
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   528
// Returns true if the predicate of iff is in "scale*iv + offset u< load_range(ptr)" format
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   529
// Note: this function is particularly designed for loop predication. We require load_range
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   530
//       and offset to be loop invariant computed on the fly by "invar"
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   531
bool IdealLoopTree::is_range_check_if(IfNode *iff, PhaseIdealLoop *phase, Invariance& invar) const {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   532
  if (!is_loop_exit(iff)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   533
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   534
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   535
  if (!iff->in(1)->is_Bool()) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   536
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   537
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   538
  const BoolNode *bol = iff->in(1)->as_Bool();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   539
  if (bol->_test._test != BoolTest::lt) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   540
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   541
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   542
  if (!bol->in(1)->is_Cmp()) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   543
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   544
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   545
  const CmpNode *cmp = bol->in(1)->as_Cmp();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   546
  if (cmp->Opcode() != Op_CmpU) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   547
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   548
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   549
  Node* range = cmp->in(2);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   550
  if (range->Opcode() != Op_LoadRange) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   551
    const TypeInt* tint = phase->_igvn.type(range)->isa_int();
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   552
    if (tint == NULL || tint->empty() || tint->_lo < 0) {
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   553
      // Allow predication on positive values that aren't LoadRanges.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   554
      // This allows optimization of loops where the length of the
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   555
      // array is a known value and doesn't need to be loaded back
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   556
      // from the array.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   557
      return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   558
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   559
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   560
  if (!invar.is_invariant(range)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   561
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   562
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   563
  Node *iv     = _head->as_CountedLoop()->phi();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   564
  int   scale  = 0;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   565
  Node *offset = NULL;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   566
  if (!phase->is_scaled_iv_plus_offset(cmp->in(1), iv, &scale, &offset)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   567
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   568
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   569
  if (offset && !invar.is_invariant(offset)) { // offset must be invariant
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   570
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   571
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   572
  return true;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   573
}
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   574
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   575
//------------------------------rc_predicate-----------------------------------
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   576
// Create a range check predicate
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   577
//
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   578
// for (i = init; i < limit; i += stride) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   579
//    a[scale*i+offset]
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   580
// }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   581
//
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   582
// Compute max(scale*i + offset) for init <= i < limit and build the predicate
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   583
// as "max(scale*i + offset) u< a.length".
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   584
//
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   585
// There are two cases for max(scale*i + offset):
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   586
// (1) stride*scale > 0
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   587
//   max(scale*i + offset) = scale*(limit-stride) + offset
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   588
// (2) stride*scale < 0
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   589
//   max(scale*i + offset) = scale*init + offset
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   590
BoolNode* PhaseIdealLoop::rc_predicate(IdealLoopTree *loop, Node* ctrl,
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   591
                                       int scale, Node* offset,
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   592
                                       Node* init, Node* limit, Node* stride,
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   593
                                       Node* range, bool upper) {
9437
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   594
  stringStream* predString = NULL;
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   595
  if (TraceLoopPredicate) {
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   596
    predString = new stringStream();
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   597
    predString->print("rc_predicate ");
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   598
  }
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   599
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   600
  Node* max_idx_expr  = init;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   601
  int stride_con = stride->get_int();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   602
  if ((stride_con > 0) == (scale > 0) == upper) {
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   603
    if (LoopLimitCheck) {
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   604
      // With LoopLimitCheck limit is not exact.
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   605
      // Calculate exact limit here.
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   606
      // Note, counted loop's test is '<' or '>'.
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   607
      limit = exact_limit(loop);
13895
f6dfe4123709 7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents: 12958
diff changeset
   608
      max_idx_expr = new (C) SubINode(limit, stride);
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   609
      register_new_node(max_idx_expr, ctrl);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   610
      if (TraceLoopPredicate) predString->print("(limit - stride) ");
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   611
    } else {
13895
f6dfe4123709 7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents: 12958
diff changeset
   612
      max_idx_expr = new (C) SubINode(limit, stride);
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   613
      register_new_node(max_idx_expr, ctrl);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   614
      if (TraceLoopPredicate) predString->print("(limit - stride) ");
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   615
    }
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   616
  } else {
9437
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   617
    if (TraceLoopPredicate) predString->print("init ");
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   618
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   619
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   620
  if (scale != 1) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   621
    ConNode* con_scale = _igvn.intcon(scale);
13895
f6dfe4123709 7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents: 12958
diff changeset
   622
    max_idx_expr = new (C) MulINode(max_idx_expr, con_scale);
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   623
    register_new_node(max_idx_expr, ctrl);
9437
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   624
    if (TraceLoopPredicate) predString->print("* %d ", scale);
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   625
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   626
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   627
  if (offset && (!offset->is_Con() || offset->get_int() != 0)){
13895
f6dfe4123709 7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents: 12958
diff changeset
   628
    max_idx_expr = new (C) AddINode(max_idx_expr, offset);
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   629
    register_new_node(max_idx_expr, ctrl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   630
    if (TraceLoopPredicate)
9437
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   631
      if (offset->is_Con()) predString->print("+ %d ", offset->get_int());
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   632
      else predString->print("+ offset ");
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   633
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   634
13895
f6dfe4123709 7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents: 12958
diff changeset
   635
  CmpUNode* cmp = new (C) CmpUNode(max_idx_expr, range);
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   636
  register_new_node(cmp, ctrl);
13895
f6dfe4123709 7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents: 12958
diff changeset
   637
  BoolNode* bol = new (C) BoolNode(cmp, BoolTest::lt);
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   638
  register_new_node(bol, ctrl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   639
9437
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   640
  if (TraceLoopPredicate) {
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   641
    predString->print_cr("<u range");
24424
2658d7834c6e 8037816: Fix for 8036122 breaks build with Xcode5/clang
drchase
parents: 23528
diff changeset
   642
    tty->print("%s", predString->as_string());
9437
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   643
  }
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   644
  return bol;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   645
}
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   646
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   647
//------------------------------ loop_predication_impl--------------------------
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   648
// Insert loop predicates for null checks and range checks
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   649
bool PhaseIdealLoop::loop_predication_impl(IdealLoopTree *loop) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   650
  if (!UseLoopPredicate) return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   651
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   652
  if (!loop->_head->is_Loop()) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   653
    // Could be a simple region when irreducible loops are present.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   654
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   655
  }
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   656
  LoopNode* head = loop->_head->as_Loop();
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   657
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   658
  if (head->unique_ctrl_out()->Opcode() == Op_NeverBranch) {
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   659
    // do nothing for infinite loops
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   660
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   661
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   662
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   663
  CountedLoopNode *cl = NULL;
10263
fa58671dde31 7077439: Possible reference through NULL in loopPredicate.cpp:726
kvn
parents: 10258
diff changeset
   664
  if (head->is_valid_counted_loop()) {
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   665
    cl = head->as_CountedLoop();
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   666
    // do nothing for iteration-splitted loops
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   667
    if (!cl->is_normal_loop()) return false;
10253
35b975b1e8f3 7070134: Hotspot crashes with sigsegv from PorterStemmer
kvn
parents: 9446
diff changeset
   668
    // Avoid RCE if Counted loop's test is '!='.
35b975b1e8f3 7070134: Hotspot crashes with sigsegv from PorterStemmer
kvn
parents: 9446
diff changeset
   669
    BoolTest::mask bt = cl->loopexit()->test_trip();
35b975b1e8f3 7070134: Hotspot crashes with sigsegv from PorterStemmer
kvn
parents: 9446
diff changeset
   670
    if (bt != BoolTest::lt && bt != BoolTest::gt)
35b975b1e8f3 7070134: Hotspot crashes with sigsegv from PorterStemmer
kvn
parents: 9446
diff changeset
   671
      cl = NULL;
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   672
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   673
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   674
  Node* entry = head->in(LoopNode::EntryControl);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   675
  ProjNode *predicate_proj = NULL;
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   676
  // Loop limit check predicate should be near the loop.
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   677
  if (LoopLimitCheck) {
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   678
    predicate_proj = find_predicate_insertion_point(entry, Deoptimization::Reason_loop_limit_check);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   679
    if (predicate_proj != NULL)
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   680
      entry = predicate_proj->in(0)->in(0);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   681
  }
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   682
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   683
  predicate_proj = find_predicate_insertion_point(entry, Deoptimization::Reason_predicate);
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   684
  if (!predicate_proj) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   685
#ifndef PRODUCT
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   686
    if (TraceLoopPredicate) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   687
      tty->print("missing predicate:");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   688
      loop->dump_head();
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   689
      head->dump(1);
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   690
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   691
#endif
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   692
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   693
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   694
  ConNode* zero = _igvn.intcon(0);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   695
  set_ctrl(zero, C->root());
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   696
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   697
  ResourceArea *area = Thread::current()->resource_area();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   698
  Invariance invar(area, loop);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   699
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   700
  // Create list of if-projs such that a newer proj dominates all older
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   701
  // projs in the list, and they all dominate loop->tail()
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   702
  Node_List if_proj_list(area);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   703
  Node *current_proj = loop->tail(); //start from tail
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   704
  while (current_proj != head) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   705
    if (loop == get_loop(current_proj) && // still in the loop ?
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   706
        current_proj->is_Proj()        && // is a projection  ?
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   707
        current_proj->in(0)->Opcode() == Op_If) { // is a if projection ?
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   708
      if_proj_list.push(current_proj);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   709
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   710
    current_proj = idom(current_proj);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   711
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   712
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   713
  bool hoisted = false; // true if at least one proj is promoted
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   714
  while (if_proj_list.size() > 0) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   715
    // Following are changed to nonnull when a predicate can be hoisted
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   716
    ProjNode* new_predicate_proj = NULL;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   717
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   718
    ProjNode* proj = if_proj_list.pop()->as_Proj();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   719
    IfNode*   iff  = proj->in(0)->as_If();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   720
21089
e1986ff6fe2e 8024069: replace_in_map() should operate on parent maps
roland
parents: 17383
diff changeset
   721
    if (!proj->is_uncommon_trap_if_pattern(Deoptimization::Reason_none)) {
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   722
      if (loop->is_loop_exit(iff)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   723
        // stop processing the remaining projs in the list because the execution of them
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   724
        // depends on the condition of "iff" (iff->in(1)).
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   725
        break;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   726
      } else {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   727
        // Both arms are inside the loop. There are two cases:
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   728
        // (1) there is one backward branch. In this case, any remaining proj
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   729
        //     in the if_proj list post-dominates "iff". So, the condition of "iff"
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   730
        //     does not determine the execution the remining projs directly, and we
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   731
        //     can safely continue.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   732
        // (2) both arms are forwarded, i.e. a diamond shape. In this case, "proj"
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   733
        //     does not dominate loop->tail(), so it can not be in the if_proj list.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   734
        continue;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   735
      }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   736
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   737
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   738
    Node*     test = iff->in(1);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   739
    if (!test->is_Bool()){ //Conv2B, ...
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   740
      continue;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   741
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   742
    BoolNode* bol = test->as_Bool();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   743
    if (invar.is_invariant(bol)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   744
      // Invariant test
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   745
      new_predicate_proj = create_new_if_for_predicate(predicate_proj, NULL,
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   746
                                                       Deoptimization::Reason_predicate);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   747
      Node* ctrl = new_predicate_proj->in(0)->as_If()->in(0);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   748
      BoolNode* new_predicate_bol = invar.clone(bol, ctrl)->as_Bool();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   749
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   750
      // Negate test if necessary
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   751
      bool negated = false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   752
      if (proj->_con != predicate_proj->_con) {
13895
f6dfe4123709 7193318: C2: remove number of inputs requirement from Node's new operator
kvn
parents: 12958
diff changeset
   753
        new_predicate_bol = new (C) BoolNode(new_predicate_bol->in(1), new_predicate_bol->_test.negate());
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   754
        register_new_node(new_predicate_bol, ctrl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   755
        negated = true;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   756
      }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   757
      IfNode* new_predicate_iff = new_predicate_proj->in(0)->as_If();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   758
      _igvn.hash_delete(new_predicate_iff);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   759
      new_predicate_iff->set_req(1, new_predicate_bol);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   760
#ifndef PRODUCT
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   761
      if (TraceLoopPredicate) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   762
        tty->print("Predicate invariant if%s: %d ", negated ? " negated" : "", new_predicate_iff->_idx);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   763
        loop->dump_head();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   764
      } else if (TraceLoopOpts) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   765
        tty->print("Predicate IC ");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   766
        loop->dump_head();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   767
      }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   768
#endif
17383
3665c0901a0d 6934604: enable parts of EliminateAutoBox by default
kvn
parents: 13963
diff changeset
   769
    } else if ((cl != NULL) && (proj->_con == predicate_proj->_con) &&
3665c0901a0d 6934604: enable parts of EliminateAutoBox by default
kvn
parents: 13963
diff changeset
   770
               loop->is_range_check_if(iff, this, invar)) {
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   771
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   772
      // Range check for counted loops
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   773
      const Node*    cmp    = bol->in(1)->as_Cmp();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   774
      Node*          idx    = cmp->in(1);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   775
      assert(!invar.is_invariant(idx), "index is variant");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   776
      Node* rng = cmp->in(2);
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   777
      assert(rng->Opcode() == Op_LoadRange || _igvn.type(rng)->is_int() >= 0, "must be");
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   778
      assert(invar.is_invariant(rng), "range must be invariant");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   779
      int scale    = 1;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   780
      Node* offset = zero;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   781
      bool ok = is_scaled_iv_plus_offset(idx, cl->phi(), &scale, &offset);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   782
      assert(ok, "must be index expression");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   783
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   784
      Node* init    = cl->init_trip();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   785
      Node* limit   = cl->limit();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   786
      Node* stride  = cl->stride();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   787
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   788
      // Build if's for the upper and lower bound tests.  The
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   789
      // lower_bound test will dominate the upper bound test and all
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   790
      // cloned or created nodes will use the lower bound test as
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   791
      // their declared control.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   792
      ProjNode* lower_bound_proj = create_new_if_for_predicate(predicate_proj, NULL, Deoptimization::Reason_predicate);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   793
      ProjNode* upper_bound_proj = create_new_if_for_predicate(predicate_proj, NULL, Deoptimization::Reason_predicate);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   794
      assert(upper_bound_proj->in(0)->as_If()->in(0) == lower_bound_proj, "should dominate");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   795
      Node *ctrl = lower_bound_proj->in(0)->as_If()->in(0);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   796
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   797
      // Perform cloning to keep Invariance state correct since the
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   798
      // late schedule will place invariant things in the loop.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   799
      rng = invar.clone(rng, ctrl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   800
      if (offset && offset != zero) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   801
        assert(invar.is_invariant(offset), "offset must be loop invariant");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   802
        offset = invar.clone(offset, ctrl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   803
      }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   804
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   805
      // Test the lower bound
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   806
      Node*  lower_bound_bol = rc_predicate(loop, ctrl, scale, offset, init, limit, stride, rng, false);
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   807
      IfNode* lower_bound_iff = lower_bound_proj->in(0)->as_If();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   808
      _igvn.hash_delete(lower_bound_iff);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   809
      lower_bound_iff->set_req(1, lower_bound_bol);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   810
      if (TraceLoopPredicate) tty->print_cr("lower bound check if: %d", lower_bound_iff->_idx);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   811
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   812
      // Test the upper bound
10253
35b975b1e8f3 7070134: Hotspot crashes with sigsegv from PorterStemmer
kvn
parents: 9446
diff changeset
   813
      Node* upper_bound_bol = rc_predicate(loop, lower_bound_proj, scale, offset, init, limit, stride, rng, true);
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   814
      IfNode* upper_bound_iff = upper_bound_proj->in(0)->as_If();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   815
      _igvn.hash_delete(upper_bound_iff);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   816
      upper_bound_iff->set_req(1, upper_bound_bol);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   817
      if (TraceLoopPredicate) tty->print_cr("upper bound check if: %d", lower_bound_iff->_idx);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   818
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   819
      // Fall through into rest of the clean up code which will move
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   820
      // any dependent nodes onto the upper bound test.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   821
      new_predicate_proj = upper_bound_proj;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   822
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   823
#ifndef PRODUCT
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   824
      if (TraceLoopOpts && !TraceLoopPredicate) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   825
        tty->print("Predicate RC ");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   826
        loop->dump_head();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   827
      }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   828
#endif
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   829
    } else {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   830
      // Loop variant check (for example, range check in non-counted loop)
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   831
      // with uncommon trap.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   832
      continue;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   833
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   834
    assert(new_predicate_proj != NULL, "sanity");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   835
    // Success - attach condition (new_predicate_bol) to predicate if
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   836
    invar.map_ctrl(proj, new_predicate_proj); // so that invariance test can be appropriate
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   837
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   838
    // Eliminate the old If in the loop body
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   839
    dominated_by( new_predicate_proj, iff, proj->_con != new_predicate_proj->_con );
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   840
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   841
    hoisted = true;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   842
    C->set_major_progress();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   843
  } // end while
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   844
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   845
#ifndef PRODUCT
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   846
  // report that the loop predication has been actually performed
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   847
  // for this loop
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   848
  if (TraceLoopPredicate && hoisted) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   849
    tty->print("Loop Predication Performed:");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   850
    loop->dump_head();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   851
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   852
#endif
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   853
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   854
  return hoisted;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   855
}
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   856
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   857
//------------------------------loop_predication--------------------------------
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   858
// driver routine for loop predication optimization
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   859
bool IdealLoopTree::loop_predication( PhaseIdealLoop *phase) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   860
  bool hoisted = false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   861
  // Recursively promote predicates
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   862
  if (_child) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   863
    hoisted = _child->loop_predication( phase);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   864
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   865
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   866
  // self
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   867
  if (!_irreducible && !tail()->is_top()) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   868
    hoisted |= phase->loop_predication_impl(this);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   869
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   870
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   871
  if (_next) { //sibling
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   872
    hoisted |= _next->loop_predication( phase);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   873
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   874
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   875
  return hoisted;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   876
}