hotspot/src/share/vm/opto/loopPredicate.cpp
author kvn
Tue, 12 Jun 2012 16:23:31 -0700
changeset 12958 009b6c9586d8
parent 10263 fa58671dde31
child 13895 f6dfe4123709
permissions -rw-r--r--
7173340: C2: code cleanup: use PhaseIterGVN::replace_edge(Node*, int, Node*) where applicable Summary: replace frequent C2 optimizer code patterns with new methods calls Reviewed-by: kvn, twisti Contributed-by: vladimir.x.ivanov@oracle.com
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/*
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 * Copyright (c) 2011, 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/loopnode.hpp"
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#include "opto/mulnode.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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//-------------------------------is_uncommon_trap_proj----------------------------
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// Return true if proj is the form of "proj->[region->..]call_uct"
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bool PhaseIdealLoop::is_uncommon_trap_proj(ProjNode* proj, Deoptimization::DeoptReason reason) {
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  int path_limit = 10;
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  assert(proj, "invalid argument");
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  Node* out = proj;
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  for (int ct = 0; ct < path_limit; ct++) {
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    out = out->unique_ctrl_out();
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    if (out == NULL)
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      return false;
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    if (out->is_CallStaticJava()) {
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      int req = out->as_CallStaticJava()->uncommon_trap_request();
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      if (req != 0) {
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        Deoptimization::DeoptReason trap_reason = Deoptimization::trap_request_reason(req);
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        if (trap_reason == reason || reason == Deoptimization::Reason_none) {
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           return true;
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        }
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      }
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      return false; // don't do further after call
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    }
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    if (out->Opcode() != Op_Region)
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      return false;
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  }
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  return false;
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}
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//-------------------------------is_uncommon_trap_if_pattern-------------------------
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// Return true  for "if(test)-> proj -> ...
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//                          |
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//                          V
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//                      other_proj->[region->..]call_uct"
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//
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// "must_reason_predicate" means the uct reason must be Reason_predicate
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bool PhaseIdealLoop::is_uncommon_trap_if_pattern(ProjNode *proj, Deoptimization::DeoptReason reason) {
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  Node *in0 = proj->in(0);
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  if (!in0->is_If()) return false;
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  // Variation of a dead If node.
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  if (in0->outcnt() < 2)  return false;
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  IfNode* iff = in0->as_If();
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  // we need "If(Conv2B(Opaque1(...)))" pattern for reason_predicate
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  if (reason != Deoptimization::Reason_none) {
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    if (iff->in(1)->Opcode() != Op_Conv2B ||
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       iff->in(1)->in(1)->Opcode() != Op_Opaque1) {
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      return false;
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    }
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  }
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  ProjNode* other_proj = iff->proj_out(1-proj->_con)->as_Proj();
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  if (is_uncommon_trap_proj(other_proj, reason)) {
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    assert(reason == Deoptimization::Reason_none ||
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           Compile::current()->is_predicate_opaq(iff->in(1)->in(1)), "should be on the list");
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    return true;
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  }
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  return false;
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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(is_uncommon_trap_if_pattern(cont_proj, 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, 1) 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, 1) IfTrueNode(new_iff);
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  Node *if_uct  = new (C, 1) 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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   213
    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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   218
    }
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  }
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  assert(!has_phi || rgn->req() > 3, "no phis when region is created");
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   221
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   222
  if (new_entry == NULL) {
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   223
    // Attach if_cont to iff
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   224
    _igvn.hash_delete(iff);
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   225
    iff->set_req(0, if_cont);
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   226
    if (_idom != NULL) {
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   227
      set_idom(iff, if_cont, dom_depth(iff));
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   228
    }
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   229
  }
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   230
  return if_cont->as_Proj();
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   231
}
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   232
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   233
//------------------------------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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   236
                                                    Deoptimization::DeoptReason reason) {
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   237
  assert(new_entry != 0, "only used for clone predicate");
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  assert(PhaseIdealLoop::is_uncommon_trap_if_pattern(cont_proj, reason), "must be a uct if pattern!");
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   239
  IfNode* iff = cont_proj->in(0)->as_If();
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   240
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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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   244
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  uint proj_index = 1; // region's edge corresponding to uncommon_proj
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   246
  if (!rgn->is_Region()) { // create a region to guard the call
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   247
    assert(rgn->is_Call(), "must be call uct");
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   248
    CallNode* call = rgn->as_Call();
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   249
    rgn = new (C, 1) RegionNode(1);
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   250
    register_new_node_with_optimizer(rgn);
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   251
    rgn->add_req(uncommon_proj);
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   252
    hash_delete(call);
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   253
    call->set_req(0, rgn);
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   254
  } else {
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   255
    // Find region's edge corresponding to uncommon_proj
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   256
    for (; proj_index < rgn->req(); proj_index++)
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   257
      if (rgn->in(proj_index) == uncommon_proj) break;
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   258
    assert(proj_index < rgn->req(), "sanity");
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   259
  }
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   260
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   261
  // Create new_iff in new location.
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   262
  IfNode *new_iff = iff->clone()->as_If();
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   263
  new_iff->set_req(0, new_entry);
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   264
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   265
  register_new_node_with_optimizer(new_iff);
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   266
  Node *if_cont = new (C, 1) IfTrueNode(new_iff);
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   267
  Node *if_uct  = new (C, 1) IfFalseNode(new_iff);
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   268
  if (cont_proj->is_IfFalse()) {
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   269
    // Swap
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   270
    Node* tmp = if_uct; if_uct = if_cont; if_cont = tmp;
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   271
  }
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   272
  register_new_node_with_optimizer(if_cont);
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   273
  register_new_node_with_optimizer(if_uct);
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   274
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   275
  // if_uct to rgn
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   276
  hash_delete(rgn);
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   277
  rgn->add_req(if_uct);
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   278
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   279
  // If rgn has phis add corresponding new edges which has the same
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   280
  // value as on original uncommon_proj pass.
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   281
  assert(rgn->in(rgn->req() -1) == if_uct, "new edge should be last");
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   282
  bool has_phi = false;
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   283
  for (DUIterator_Fast imax, i = rgn->fast_outs(imax); i < imax; i++) {
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   284
    Node* use = rgn->fast_out(i);
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   285
    if (use->is_Phi() && use->outcnt() > 0) {
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      rehash_node_delayed(use);
9101
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   287
      use->add_req(use->in(proj_index));
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   288
      has_phi = true;
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   289
    }
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   290
  }
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   291
  assert(!has_phi || rgn->req() > 3, "no phis when region is created");
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   292
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   293
  return if_cont->as_Proj();
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   294
}
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   295
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   296
//--------------------------clone_predicate-----------------------
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   297
ProjNode* PhaseIdealLoop::clone_predicate(ProjNode* predicate_proj, Node* new_entry,
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   298
                                          Deoptimization::DeoptReason reason,
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   299
                                          PhaseIdealLoop* loop_phase,
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   300
                                          PhaseIterGVN* igvn) {
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   301
  ProjNode* new_predicate_proj;
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   302
  if (loop_phase != NULL) {
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   303
    new_predicate_proj = loop_phase->create_new_if_for_predicate(predicate_proj, new_entry, reason);
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parents:
diff changeset
   304
  } else {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
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diff changeset
   305
    new_predicate_proj =       igvn->create_new_if_for_predicate(predicate_proj, new_entry, reason);
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parents:
diff changeset
   306
  }
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   307
  IfNode* iff = new_predicate_proj->in(0)->as_If();
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diff changeset
   308
  Node* ctrl  = iff->in(0);
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parents:
diff changeset
   309
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   310
  // Match original condition since predicate's projections could be swapped.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
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diff changeset
   311
  assert(predicate_proj->in(0)->in(1)->in(1)->Opcode()==Op_Opaque1, "must be");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
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parents:
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   312
  Node* opq = new (igvn->C, 2) Opaque1Node(igvn->C, predicate_proj->in(0)->in(1)->in(1)->in(1));
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
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parents:
diff changeset
   313
  igvn->C->add_predicate_opaq(opq);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
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parents:
diff changeset
   314
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
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   315
  Node* bol = new (igvn->C, 2) Conv2BNode(opq);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
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parents:
diff changeset
   316
  if (loop_phase != NULL) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   317
    loop_phase->register_new_node(opq, ctrl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   318
    loop_phase->register_new_node(bol, ctrl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   319
  } else {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   320
    igvn->register_new_node_with_optimizer(opq);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   321
    igvn->register_new_node_with_optimizer(bol);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   322
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   323
  igvn->hash_delete(iff);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   324
  iff->set_req(1, bol);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   325
  return new_predicate_proj;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
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parents:
diff changeset
   326
}
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
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parents:
diff changeset
   327
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   328
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   329
//--------------------------clone_loop_predicates-----------------------
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
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parents:
diff changeset
   330
// Interface from IGVN
9446
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diff changeset
   331
Node* PhaseIterGVN::clone_loop_predicates(Node* old_entry, Node* new_entry, bool clone_limit_check) {
10258
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
diff changeset
   332
  return PhaseIdealLoop::clone_loop_predicates(old_entry, new_entry, clone_limit_check, NULL, this);
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   333
}
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
// Interface from PhaseIdealLoop
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
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parents: 9437
diff changeset
   336
Node* PhaseIdealLoop::clone_loop_predicates(Node* old_entry, Node* new_entry, bool clone_limit_check) {
10258
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
diff changeset
   337
  return clone_loop_predicates(old_entry, new_entry, clone_limit_check, this, &this->_igvn);
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
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diff changeset
   338
}
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   339
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   340
// Clone loop predicates to cloned loops (peeled, unswitched, split_if).
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   341
Node* PhaseIdealLoop::clone_loop_predicates(Node* old_entry, Node* new_entry,
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
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diff changeset
   342
                                                bool clone_limit_check,
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   343
                                                PhaseIdealLoop* loop_phase,
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   344
                                                PhaseIterGVN* igvn) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   345
#ifdef ASSERT
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
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parents:
diff changeset
   346
  if (new_entry == NULL || !(new_entry->is_Proj() || new_entry->is_Region() || new_entry->is_SafePoint())) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   347
    if (new_entry != NULL)
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   348
      new_entry->dump();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   349
    assert(false, "not IfTrue, IfFalse, Region or SafePoint");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   350
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   351
#endif
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   352
  // Search original predicates
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   353
  Node* entry = old_entry;
9446
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parents: 9437
diff changeset
   354
  ProjNode* limit_check_proj = NULL;
748a37b25d10 5091921: Sign flip issues in loop optimizer
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parents: 9437
diff changeset
   355
  if (LoopLimitCheck) {
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   356
    limit_check_proj = find_predicate_insertion_point(entry, Deoptimization::Reason_loop_limit_check);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   357
    if (limit_check_proj != NULL) {
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   358
      entry = entry->in(0)->in(0);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   359
    }
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   360
  }
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   361
  if (UseLoopPredicate) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   362
    ProjNode* predicate_proj = find_predicate_insertion_point(entry, Deoptimization::Reason_predicate);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   363
    if (predicate_proj != NULL) { // right pattern that can be used by loop predication
10258
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
diff changeset
   364
      // clone predicate
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
diff changeset
   365
      new_entry = clone_predicate(predicate_proj, new_entry,
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
diff changeset
   366
                                  Deoptimization::Reason_predicate,
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
diff changeset
   367
                                  loop_phase, igvn);
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
diff changeset
   368
      assert(new_entry != NULL && new_entry->is_Proj(), "IfTrue or IfFalse after clone predicate");
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   369
      if (TraceLoopPredicate) {
10258
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
diff changeset
   370
        tty->print("Loop Predicate cloned: ");
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   371
        debug_only( new_entry->in(0)->dump(); )
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
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   374
  }
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   375
  if (limit_check_proj != NULL && clone_limit_check) {
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   376
    // Clone loop limit check last to insert it before loop.
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   377
    // Don't clone a limit check which was already finalized
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   378
    // 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
   379
    new_entry = clone_predicate(limit_check_proj, new_entry,
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
diff changeset
   380
                                Deoptimization::Reason_loop_limit_check,
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
diff changeset
   381
                                loop_phase, igvn);
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
diff changeset
   382
    assert(new_entry != NULL && new_entry->is_Proj(), "IfTrue or IfFalse after clone limit check");
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   383
    if (TraceLoopLimitCheck) {
10258
10c77b8c8d3e 7068051: SIGSEGV in PhaseIdealLoop::build_loop_late_post
kvn
parents: 10253
diff changeset
   384
      tty->print("Loop Limit Check cloned: ");
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   385
      debug_only( new_entry->in(0)->dump(); )
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   386
    }
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   387
  }
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   388
  return new_entry;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   389
}
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
//--------------------------skip_loop_predicates------------------------------
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   392
// Skip related predicates.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   393
Node* PhaseIdealLoop::skip_loop_predicates(Node* entry) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   394
  Node* predicate = NULL;
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   395
  if (LoopLimitCheck) {
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   396
    predicate = find_predicate_insertion_point(entry, Deoptimization::Reason_loop_limit_check);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   397
    if (predicate != NULL) {
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   398
      entry = entry->in(0)->in(0);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   399
    }
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   400
  }
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   401
  if (UseLoopPredicate) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   402
    predicate = find_predicate_insertion_point(entry, Deoptimization::Reason_predicate);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   403
    if (predicate != NULL) { // right pattern that can be used by loop predication
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   404
      IfNode* iff = entry->in(0)->as_If();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   405
      ProjNode* uncommon_proj = iff->proj_out(1 - entry->as_Proj()->_con);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   406
      Node* rgn = uncommon_proj->unique_ctrl_out();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   407
      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
   408
      entry = entry->in(0)->in(0);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   409
      while (entry != NULL && entry->is_Proj() && entry->in(0)->is_If()) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   410
        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
   411
        if (uncommon_proj->unique_ctrl_out() != rgn)
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   412
          break;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   413
        entry = entry->in(0)->in(0);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   414
      }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   415
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   416
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   417
  return entry;
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
//--------------------------find_predicate_insertion_point-------------------
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   421
// Find a good location to insert a predicate
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   422
ProjNode* PhaseIdealLoop::find_predicate_insertion_point(Node* start_c, Deoptimization::DeoptReason reason) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   423
  if (start_c == NULL || !start_c->is_Proj())
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   424
    return NULL;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   425
  if (is_uncommon_trap_if_pattern(start_c->as_Proj(), reason)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   426
    return start_c->as_Proj();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   427
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   428
  return NULL;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   429
}
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   430
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   431
//--------------------------find_predicate------------------------------------
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   432
// Find a predicate
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   433
Node* PhaseIdealLoop::find_predicate(Node* entry) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   434
  Node* predicate = NULL;
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   435
  if (LoopLimitCheck) {
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   436
    predicate = find_predicate_insertion_point(entry, Deoptimization::Reason_loop_limit_check);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   437
    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
   438
      return entry;
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   439
    }
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   440
  }
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   441
  if (UseLoopPredicate) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   442
    predicate = find_predicate_insertion_point(entry, Deoptimization::Reason_predicate);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   443
    if (predicate != NULL) { // right pattern that can be used by loop predication
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   444
      return entry;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   445
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   446
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   447
  return NULL;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   448
}
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   449
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   450
//------------------------------Invariance-----------------------------------
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   451
// 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
   452
// clone invariants.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   453
class Invariance : public StackObj {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   454
  VectorSet _visited, _invariant;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   455
  Node_Stack _stack;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   456
  VectorSet _clone_visited;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   457
  Node_List _old_new; // map of old to new (clone)
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   458
  IdealLoopTree* _lpt;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   459
  PhaseIdealLoop* _phase;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   460
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   461
  // Helper function to set up the invariance for invariance computation
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   462
  // 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
   463
  // the possibility to push n onto the stack for further processing.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   464
  void visit(Node* use, Node* n) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   465
    if (_lpt->is_invariant(n)) { // known invariant
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   466
      _invariant.set(n->_idx);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   467
    } else if (!n->is_CFG()) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   468
      Node *n_ctrl = _phase->ctrl_or_self(n);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   469
      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
   470
      if (_phase->is_dominator(n_ctrl, u_ctrl)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   471
        _stack.push(n, n->in(0) == NULL ? 1 : 0);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   472
      }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   473
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   474
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   475
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   476
  // Compute invariance for "the_node" and (possibly) all its inputs recursively
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   477
  // on the fly
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   478
  void compute_invariance(Node* n) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   479
    assert(_visited.test(n->_idx), "must be");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   480
    visit(n, n);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   481
    while (_stack.is_nonempty()) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   482
      Node*  n = _stack.node();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   483
      uint idx = _stack.index();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   484
      if (idx == n->req()) { // all inputs are processed
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   485
        _stack.pop();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   486
        // n is invariant if it's inputs are all invariant
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   487
        bool all_inputs_invariant = true;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   488
        for (uint i = 0; i < n->req(); i++) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   489
          Node* in = n->in(i);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   490
          if (in == NULL) continue;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   491
          assert(_visited.test(in->_idx), "must have visited input");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   492
          if (!_invariant.test(in->_idx)) { // bad guy
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   493
            all_inputs_invariant = false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   494
            break;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   495
          }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   496
        }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   497
        if (all_inputs_invariant) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   498
          _invariant.set(n->_idx); // I am a invariant too
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   499
        }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   500
      } else { // process next input
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   501
        _stack.set_index(idx + 1);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   502
        Node* m = n->in(idx);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   503
        if (m != NULL && !_visited.test_set(m->_idx)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   504
          visit(n, m);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   505
        }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   506
      }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   507
    }
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
  // Helper function to set up _old_new map for clone_nodes.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   511
  // 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
   512
  // Otherwise, push n onto the stack for real cloning.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   513
  void clone_visit(Node* n) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   514
    assert(_invariant.test(n->_idx), "must be invariant");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   515
    if (_lpt->is_invariant(n)) { // known invariant
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   516
      _old_new.map(n->_idx, n);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   517
    } else { // to be cloned
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   518
      assert(!n->is_CFG(), "should not see CFG here");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   519
      _stack.push(n, n->in(0) == NULL ? 1 : 0);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   520
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   521
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   522
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   523
  // Clone "n" and (possibly) all its inputs recursively
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   524
  void clone_nodes(Node* n, Node* ctrl) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   525
    clone_visit(n);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   526
    while (_stack.is_nonempty()) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   527
      Node*  n = _stack.node();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   528
      uint idx = _stack.index();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   529
      if (idx == n->req()) { // all inputs processed, clone n!
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   530
        _stack.pop();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   531
        // clone invariant node
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   532
        Node* n_cl = n->clone();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   533
        _old_new.map(n->_idx, n_cl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   534
        _phase->register_new_node(n_cl, ctrl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   535
        for (uint i = 0; i < n->req(); i++) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   536
          Node* in = n_cl->in(i);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   537
          if (in == NULL) continue;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   538
          n_cl->set_req(i, _old_new[in->_idx]);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   539
        }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   540
      } else { // process next input
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   541
        _stack.set_index(idx + 1);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   542
        Node* m = n->in(idx);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   543
        if (m != NULL && !_clone_visited.test_set(m->_idx)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   544
          clone_visit(m); // visit the input
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   545
        }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   546
      }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   547
    }
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
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   550
 public:
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   551
  Invariance(Arena* area, IdealLoopTree* lpt) :
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   552
    _lpt(lpt), _phase(lpt->_phase),
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   553
    _visited(area), _invariant(area), _stack(area, 10 /* guess */),
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   554
    _clone_visited(area), _old_new(area)
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   555
  {}
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   556
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   557
  // Map old to n for invariance computation and clone
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   558
  void map_ctrl(Node* old, Node* n) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   559
    assert(old->is_CFG() && n->is_CFG(), "must be");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   560
    _old_new.map(old->_idx, n); // "clone" of old is n
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   561
    _invariant.set(old->_idx);  // old is invariant
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   562
    _clone_visited.set(old->_idx);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   563
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   564
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   565
  // Driver function to compute invariance
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   566
  bool is_invariant(Node* n) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   567
    if (!_visited.test_set(n->_idx))
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   568
      compute_invariance(n);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   569
    return (_invariant.test(n->_idx) != 0);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   570
  }
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
  // Driver function to clone invariant
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   573
  Node* clone(Node* n, Node* ctrl) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   574
    assert(ctrl->is_CFG(), "must be");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   575
    assert(_invariant.test(n->_idx), "must be an invariant");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   576
    if (!_clone_visited.test(n->_idx))
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   577
      clone_nodes(n, ctrl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   578
    return _old_new[n->_idx];
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   579
  }
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
//------------------------------is_range_check_if -----------------------------------
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   583
// 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
   584
// 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
   585
//       and offset to be loop invariant computed on the fly by "invar"
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   586
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
   587
  if (!is_loop_exit(iff)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   588
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   589
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   590
  if (!iff->in(1)->is_Bool()) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   591
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   592
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   593
  const BoolNode *bol = iff->in(1)->as_Bool();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   594
  if (bol->_test._test != BoolTest::lt) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   595
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   596
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   597
  if (!bol->in(1)->is_Cmp()) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   598
    return false;
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
  const CmpNode *cmp = bol->in(1)->as_Cmp();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   601
  if (cmp->Opcode() != Op_CmpU) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   602
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   603
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   604
  Node* range = cmp->in(2);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   605
  if (range->Opcode() != Op_LoadRange) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   606
    const TypeInt* tint = phase->_igvn.type(range)->isa_int();
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   607
    if (tint == NULL || tint->empty() || tint->_lo < 0) {
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   608
      // Allow predication on positive values that aren't LoadRanges.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   609
      // This allows optimization of loops where the length of the
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   610
      // 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
   611
      // from the array.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   612
      return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   613
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   614
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   615
  if (!invar.is_invariant(range)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   616
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   617
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   618
  Node *iv     = _head->as_CountedLoop()->phi();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   619
  int   scale  = 0;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   620
  Node *offset = NULL;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   621
  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
   622
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   623
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   624
  if (offset && !invar.is_invariant(offset)) { // offset must be invariant
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   625
    return false;
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
  return true;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   628
}
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   629
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   630
//------------------------------rc_predicate-----------------------------------
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   631
// Create a range check predicate
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   632
//
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   633
// for (i = init; i < limit; i += stride) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   634
//    a[scale*i+offset]
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   635
// }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   636
//
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   637
// 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
   638
// as "max(scale*i + offset) u< a.length".
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   639
//
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   640
// There are two cases for max(scale*i + offset):
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   641
// (1) stride*scale > 0
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   642
//   max(scale*i + offset) = scale*(limit-stride) + offset
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   643
// (2) stride*scale < 0
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   644
//   max(scale*i + offset) = scale*init + offset
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   645
BoolNode* PhaseIdealLoop::rc_predicate(IdealLoopTree *loop, Node* ctrl,
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   646
                                       int scale, Node* offset,
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   647
                                       Node* init, Node* limit, Node* stride,
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   648
                                       Node* range, bool upper) {
9437
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   649
  stringStream* predString = NULL;
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   650
  if (TraceLoopPredicate) {
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   651
    predString = new stringStream();
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   652
    predString->print("rc_predicate ");
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   653
  }
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   654
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   655
  Node* max_idx_expr  = init;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   656
  int stride_con = stride->get_int();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   657
  if ((stride_con > 0) == (scale > 0) == upper) {
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   658
    if (LoopLimitCheck) {
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   659
      // With LoopLimitCheck limit is not exact.
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   660
      // Calculate exact limit here.
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   661
      // Note, counted loop's test is '<' or '>'.
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   662
      limit = exact_limit(loop);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   663
      max_idx_expr = new (C, 3) SubINode(limit, stride);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   664
      register_new_node(max_idx_expr, ctrl);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   665
      if (TraceLoopPredicate) predString->print("(limit - stride) ");
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   666
    } else {
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   667
      max_idx_expr = new (C, 3) SubINode(limit, stride);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   668
      register_new_node(max_idx_expr, ctrl);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   669
      if (TraceLoopPredicate) predString->print("(limit - stride) ");
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   670
    }
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   671
  } else {
9437
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   672
    if (TraceLoopPredicate) predString->print("init ");
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   673
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   674
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   675
  if (scale != 1) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   676
    ConNode* con_scale = _igvn.intcon(scale);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   677
    max_idx_expr = new (C, 3) MulINode(max_idx_expr, con_scale);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   678
    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
   679
    if (TraceLoopPredicate) predString->print("* %d ", scale);
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   680
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   681
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   682
  if (offset && (!offset->is_Con() || offset->get_int() != 0)){
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   683
    max_idx_expr = new (C, 3) AddINode(max_idx_expr, offset);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   684
    register_new_node(max_idx_expr, ctrl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   685
    if (TraceLoopPredicate)
9437
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   686
      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
   687
      else predString->print("+ offset ");
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   688
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   689
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   690
  CmpUNode* cmp = new (C, 3) CmpUNode(max_idx_expr, range);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   691
  register_new_node(cmp, ctrl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   692
  BoolNode* bol = new (C, 2) BoolNode(cmp, BoolTest::lt);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   693
  register_new_node(bol, ctrl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   694
9437
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   695
  if (TraceLoopPredicate) {
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   696
    predString->print_cr("<u range");
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   697
    tty->print(predString->as_string());
9981851b4b8c 7009361: JSR 292 Invalid value on stack on solaris-sparc with -Xcomp
never
parents: 9101
diff changeset
   698
  }
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   699
  return bol;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   700
}
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   701
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   702
//------------------------------ loop_predication_impl--------------------------
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   703
// Insert loop predicates for null checks and range checks
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   704
bool PhaseIdealLoop::loop_predication_impl(IdealLoopTree *loop) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   705
  if (!UseLoopPredicate) return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   706
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   707
  if (!loop->_head->is_Loop()) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   708
    // Could be a simple region when irreducible loops are present.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   709
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   710
  }
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   711
  LoopNode* head = loop->_head->as_Loop();
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   712
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   713
  if (head->unique_ctrl_out()->Opcode() == Op_NeverBranch) {
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   714
    // do nothing for infinite loops
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   715
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   716
  }
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
  CountedLoopNode *cl = NULL;
10263
fa58671dde31 7077439: Possible reference through NULL in loopPredicate.cpp:726
kvn
parents: 10258
diff changeset
   719
  if (head->is_valid_counted_loop()) {
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   720
    cl = head->as_CountedLoop();
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   721
    // do nothing for iteration-splitted loops
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   722
    if (!cl->is_normal_loop()) return false;
10253
35b975b1e8f3 7070134: Hotspot crashes with sigsegv from PorterStemmer
kvn
parents: 9446
diff changeset
   723
    // Avoid RCE if Counted loop's test is '!='.
35b975b1e8f3 7070134: Hotspot crashes with sigsegv from PorterStemmer
kvn
parents: 9446
diff changeset
   724
    BoolTest::mask bt = cl->loopexit()->test_trip();
35b975b1e8f3 7070134: Hotspot crashes with sigsegv from PorterStemmer
kvn
parents: 9446
diff changeset
   725
    if (bt != BoolTest::lt && bt != BoolTest::gt)
35b975b1e8f3 7070134: Hotspot crashes with sigsegv from PorterStemmer
kvn
parents: 9446
diff changeset
   726
      cl = NULL;
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   727
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   728
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   729
  Node* entry = head->in(LoopNode::EntryControl);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   730
  ProjNode *predicate_proj = NULL;
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   731
  // Loop limit check predicate should be near the loop.
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   732
  if (LoopLimitCheck) {
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   733
    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
   734
    if (predicate_proj != NULL)
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   735
      entry = predicate_proj->in(0)->in(0);
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   736
  }
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   737
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   738
  predicate_proj = find_predicate_insertion_point(entry, Deoptimization::Reason_predicate);
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   739
  if (!predicate_proj) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   740
#ifndef PRODUCT
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   741
    if (TraceLoopPredicate) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   742
      tty->print("missing predicate:");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   743
      loop->dump_head();
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   744
      head->dump(1);
9101
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   745
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   746
#endif
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   747
    return false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   748
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   749
  ConNode* zero = _igvn.intcon(0);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   750
  set_ctrl(zero, C->root());
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   751
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   752
  ResourceArea *area = Thread::current()->resource_area();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   753
  Invariance invar(area, loop);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   754
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   755
  // 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
   756
  // projs in the list, and they all dominate loop->tail()
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   757
  Node_List if_proj_list(area);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   758
  Node *current_proj = loop->tail(); //start from tail
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   759
  while (current_proj != head) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   760
    if (loop == get_loop(current_proj) && // still in the loop ?
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   761
        current_proj->is_Proj()        && // is a projection  ?
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   762
        current_proj->in(0)->Opcode() == Op_If) { // is a if projection ?
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   763
      if_proj_list.push(current_proj);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   764
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   765
    current_proj = idom(current_proj);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   766
  }
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
  bool hoisted = false; // true if at least one proj is promoted
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   769
  while (if_proj_list.size() > 0) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   770
    // Following are changed to nonnull when a predicate can be hoisted
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   771
    ProjNode* new_predicate_proj = NULL;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   772
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   773
    ProjNode* proj = if_proj_list.pop()->as_Proj();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   774
    IfNode*   iff  = proj->in(0)->as_If();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   775
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   776
    if (!is_uncommon_trap_if_pattern(proj, Deoptimization::Reason_none)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   777
      if (loop->is_loop_exit(iff)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   778
        // 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
   779
        // depends on the condition of "iff" (iff->in(1)).
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   780
        break;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   781
      } else {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   782
        // Both arms are inside the loop. There are two cases:
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   783
        // (1) there is one backward branch. In this case, any remaining proj
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   784
        //     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
   785
        //     does not determine the execution the remining projs directly, and we
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   786
        //     can safely continue.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   787
        // (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
   788
        //     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
   789
        continue;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   790
      }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   791
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   792
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   793
    Node*     test = iff->in(1);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   794
    if (!test->is_Bool()){ //Conv2B, ...
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   795
      continue;
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
    BoolNode* bol = test->as_Bool();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   798
    if (invar.is_invariant(bol)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   799
      // Invariant test
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   800
      new_predicate_proj = create_new_if_for_predicate(predicate_proj, NULL,
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   801
                                                       Deoptimization::Reason_predicate);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   802
      Node* ctrl = new_predicate_proj->in(0)->as_If()->in(0);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   803
      BoolNode* new_predicate_bol = invar.clone(bol, ctrl)->as_Bool();
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
      // Negate test if necessary
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   806
      bool negated = false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   807
      if (proj->_con != predicate_proj->_con) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   808
        new_predicate_bol = new (C, 2) BoolNode(new_predicate_bol->in(1), new_predicate_bol->_test.negate());
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   809
        register_new_node(new_predicate_bol, ctrl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   810
        negated = true;
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
      IfNode* new_predicate_iff = new_predicate_proj->in(0)->as_If();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   813
      _igvn.hash_delete(new_predicate_iff);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   814
      new_predicate_iff->set_req(1, new_predicate_bol);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   815
#ifndef PRODUCT
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   816
      if (TraceLoopPredicate) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   817
        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
   818
        loop->dump_head();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   819
      } else if (TraceLoopOpts) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   820
        tty->print("Predicate IC ");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   821
        loop->dump_head();
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
#endif
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   824
    } else if (cl != NULL && loop->is_range_check_if(iff, this, invar)) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   825
      assert(proj->_con == predicate_proj->_con, "must match");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   826
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   827
      // Range check for counted loops
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   828
      const Node*    cmp    = bol->in(1)->as_Cmp();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   829
      Node*          idx    = cmp->in(1);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   830
      assert(!invar.is_invariant(idx), "index is variant");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   831
      Node* rng = cmp->in(2);
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   832
      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
   833
      assert(invar.is_invariant(rng), "range must be invariant");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   834
      int scale    = 1;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   835
      Node* offset = zero;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   836
      bool ok = is_scaled_iv_plus_offset(idx, cl->phi(), &scale, &offset);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   837
      assert(ok, "must be index expression");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   838
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   839
      Node* init    = cl->init_trip();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   840
      Node* limit   = cl->limit();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   841
      Node* stride  = cl->stride();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   842
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   843
      // Build if's for the upper and lower bound tests.  The
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   844
      // lower_bound test will dominate the upper bound test and all
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   845
      // cloned or created nodes will use the lower bound test as
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   846
      // their declared control.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   847
      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
   848
      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
   849
      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
   850
      Node *ctrl = lower_bound_proj->in(0)->as_If()->in(0);
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
      // Perform cloning to keep Invariance state correct since the
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   853
      // late schedule will place invariant things in the loop.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   854
      rng = invar.clone(rng, ctrl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   855
      if (offset && offset != zero) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   856
        assert(invar.is_invariant(offset), "offset must be loop invariant");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   857
        offset = invar.clone(offset, ctrl);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   858
      }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   859
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   860
      // Test the lower bound
9446
748a37b25d10 5091921: Sign flip issues in loop optimizer
kvn
parents: 9437
diff changeset
   861
      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
   862
      IfNode* lower_bound_iff = lower_bound_proj->in(0)->as_If();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   863
      _igvn.hash_delete(lower_bound_iff);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   864
      lower_bound_iff->set_req(1, lower_bound_bol);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   865
      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
   866
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   867
      // Test the upper bound
10253
35b975b1e8f3 7070134: Hotspot crashes with sigsegv from PorterStemmer
kvn
parents: 9446
diff changeset
   868
      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
   869
      IfNode* upper_bound_iff = upper_bound_proj->in(0)->as_If();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   870
      _igvn.hash_delete(upper_bound_iff);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   871
      upper_bound_iff->set_req(1, upper_bound_bol);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   872
      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
   873
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   874
      // Fall through into rest of the clean up code which will move
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   875
      // any dependent nodes onto the upper bound test.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   876
      new_predicate_proj = upper_bound_proj;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   877
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   878
#ifndef PRODUCT
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   879
      if (TraceLoopOpts && !TraceLoopPredicate) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   880
        tty->print("Predicate RC ");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   881
        loop->dump_head();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   882
      }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   883
#endif
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   884
    } else {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   885
      // Loop variant check (for example, range check in non-counted loop)
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   886
      // with uncommon trap.
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   887
      continue;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   888
    }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   889
    assert(new_predicate_proj != NULL, "sanity");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   890
    // Success - attach condition (new_predicate_bol) to predicate if
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   891
    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
   892
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   893
    // Eliminate the old If in the loop body
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   894
    dominated_by( new_predicate_proj, iff, proj->_con != new_predicate_proj->_con );
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   895
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   896
    hoisted = true;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   897
    C->set_major_progress();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   898
  } // end while
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   899
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   900
#ifndef PRODUCT
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   901
  // report that the loop predication has been actually performed
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   902
  // for this loop
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   903
  if (TraceLoopPredicate && hoisted) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   904
    tty->print("Loop Predication Performed:");
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   905
    loop->dump_head();
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   906
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   907
#endif
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   908
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   909
  return hoisted;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   910
}
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   911
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   912
//------------------------------loop_predication--------------------------------
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   913
// driver routine for loop predication optimization
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   914
bool IdealLoopTree::loop_predication( PhaseIdealLoop *phase) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   915
  bool hoisted = false;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   916
  // Recursively promote predicates
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   917
  if (_child) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   918
    hoisted = _child->loop_predication( phase);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   919
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   920
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   921
  // self
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   922
  if (!_irreducible && !tail()->is_top()) {
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   923
    hoisted |= phase->loop_predication_impl(this);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   924
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   925
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   926
  if (_next) { //sibling
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   927
    hoisted |= _next->loop_predication( phase);
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   928
  }
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   929
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   930
  return hoisted;
ff58f9a8e31c 7004535: Clone loop predicate during loop unswitch
kvn
parents:
diff changeset
   931
}