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vector.cpp 
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/*
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 * Copyright (c) 2020, 2024, 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 "ci/ciSymbols.hpp"
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#include "gc/shared/barrierSet.hpp"
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#include "opto/castnode.hpp"
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#include "opto/graphKit.hpp"
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#include "opto/phaseX.hpp"
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#include "opto/rootnode.hpp"
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#include "opto/vector.hpp"
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#include "utilities/macros.hpp"
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static bool is_vector_mask(ciKlass* klass) {
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  return klass->is_subclass_of(ciEnv::current()->vector_VectorMask_klass());
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}
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static bool is_vector_shuffle(ciKlass* klass) {
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  return klass->is_subclass_of(ciEnv::current()->vector_VectorShuffle_klass());
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}
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void PhaseVector::optimize_vector_boxes() {
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  Compile::TracePhase tp("vector_elimination", &timers[_t_vector_elimination]);
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  // Signal GraphKit it's post-parse phase.
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  assert(C->inlining_incrementally() == false, "sanity");
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  C->set_inlining_incrementally(true);
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  C->igvn_worklist()->ensure_empty(); // should be done with igvn
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  expand_vunbox_nodes();
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  scalarize_vbox_nodes();
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  C->inline_vector_reboxing_calls();
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  expand_vbox_nodes();
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  eliminate_vbox_alloc_nodes();
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  C->set_inlining_incrementally(false);
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  do_cleanup();
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}
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void PhaseVector::do_cleanup() {
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  if (C->failing())  return;
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  {
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    Compile::TracePhase tp("vector_pru", &timers[_t_vector_pru]);
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    ResourceMark rm;
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    PhaseRemoveUseless pru(C->initial_gvn(), *C->igvn_worklist());
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    if (C->failing())  return;
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  }
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  {
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    Compile::TracePhase tp("incrementalInline_igvn", &timers[_t_vector_igvn]);
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    _igvn.reset_from_gvn(C->initial_gvn());
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    _igvn.optimize();
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    if (C->failing())  return;
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  }
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  C->print_method(PHASE_ITER_GVN_BEFORE_EA, 3);
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}
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void PhaseVector::scalarize_vbox_nodes() {
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  if (C->failing())  return;
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  if (!EnableVectorReboxing) {
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    return; // don't scalarize vector boxes
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  }
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  int macro_idx = C->macro_count() - 1;
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  while (macro_idx >= 0) {
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    Node * n = C->macro_node(macro_idx);
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    assert(n->is_macro(), "only macro nodes expected here");
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    if (n->Opcode() == Op_VectorBox) {
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      VectorBoxNode* vbox = static_cast<VectorBoxNode*>(n);
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      scalarize_vbox_node(vbox);
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      if (C->failing())  return;
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      C->print_method(PHASE_SCALARIZE_VBOX, 3, vbox);
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    }
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    if (C->failing())  return;
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    macro_idx = MIN2(macro_idx - 1, C->macro_count() - 1);
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  }
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}
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void PhaseVector::expand_vbox_nodes() {
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  if (C->failing())  return;
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  int macro_idx = C->macro_count() - 1;
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  while (macro_idx >= 0) {
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    Node * n = C->macro_node(macro_idx);
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    assert(n->is_macro(), "only macro nodes expected here");
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    if (n->Opcode() == Op_VectorBox) {
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      VectorBoxNode* vbox = static_cast<VectorBoxNode*>(n);
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      expand_vbox_node(vbox);
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      if (C->failing())  return;
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    }
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    if (C->failing())  return;
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    macro_idx = MIN2(macro_idx - 1, C->macro_count() - 1);
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  }
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}
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void PhaseVector::expand_vunbox_nodes() {
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  if (C->failing())  return;
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  int macro_idx = C->macro_count() - 1;
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  while (macro_idx >= 0) {
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    Node * n = C->macro_node(macro_idx);
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    assert(n->is_macro(), "only macro nodes expected here");
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    if (n->Opcode() == Op_VectorUnbox) {
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      VectorUnboxNode* vec_unbox = static_cast<VectorUnboxNode*>(n);
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      expand_vunbox_node(vec_unbox);
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      if (C->failing())  return;
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      C->print_method(PHASE_EXPAND_VUNBOX, 3, vec_unbox);
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    }
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    if (C->failing())  return;
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    macro_idx = MIN2(macro_idx - 1, C->macro_count() - 1);
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  }
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}
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void PhaseVector::eliminate_vbox_alloc_nodes() {
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  if (C->failing())  return;
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  int macro_idx = C->macro_count() - 1;
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  while (macro_idx >= 0) {
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    Node * n = C->macro_node(macro_idx);
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    assert(n->is_macro(), "only macro nodes expected here");
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    if (n->Opcode() == Op_VectorBoxAllocate) {
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      VectorBoxAllocateNode* vbox_alloc = static_cast<VectorBoxAllocateNode*>(n);
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      eliminate_vbox_alloc_node(vbox_alloc);
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      if (C->failing())  return;
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      C->print_method(PHASE_ELIMINATE_VBOX_ALLOC, 3, vbox_alloc);
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    }
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    if (C->failing())  return;
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    macro_idx = MIN2(macro_idx - 1, C->macro_count() - 1);
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  }
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}
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static JVMState* clone_jvms(Compile* C, SafePointNode* sfpt) {
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  JVMState* new_jvms = sfpt->jvms()->clone_shallow(C);
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  uint size = sfpt->req();
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  SafePointNode* map = new SafePointNode(size, new_jvms);
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  for (uint i = 0; i < size; i++) {
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    map->init_req(i, sfpt->in(i));
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  }
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  Node* mem = map->memory();
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  if (!mem->is_MergeMem()) {
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    // Since we are not in parsing, the SafePointNode does not guarantee that the memory
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    // input is necessarily a MergeMemNode. But we need to ensure that there is that
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    // MergeMemNode, since the GraphKit assumes the memory input of the map to be a
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    // MergeMemNode, so that it can directly access the memory slices.
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    PhaseGVN& gvn = *C->initial_gvn();
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    Node* mergemem = MergeMemNode::make(mem);
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    gvn.set_type_bottom(mergemem);
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    map->set_memory(mergemem);
175
  }
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  new_jvms->set_map(map);
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  return new_jvms;
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}
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void PhaseVector::scalarize_vbox_node(VectorBoxNode* vec_box) {
181
  Node* vec_value = vec_box->in(VectorBoxNode::Value);
182
  PhaseGVN& gvn = *C->initial_gvn();
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184
  // Process merged VBAs
185

186
  if (EnableVectorAggressiveReboxing) {
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    Unique_Node_List calls;
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    for (DUIterator_Fast imax, i = vec_box->fast_outs(imax); i < imax; i++) {
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      Node* use = vec_box->fast_out(i);
190
      if (use->is_CallJava()) {
191
        CallJavaNode* call = use->as_CallJava();
192
        if (call->has_non_debug_use(vec_box) && vec_box->in(VectorBoxNode::Box)->is_Phi()) {
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          calls.push(call);
194
        }
195
      }
196
    }
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198
    while (calls.size() > 0) {
199
      CallJavaNode* call = calls.pop()->as_CallJava();
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      // Attach new VBA to the call and use it instead of Phi (VBA ... VBA).
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202
      JVMState* jvms = clone_jvms(C, call);
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      GraphKit kit(jvms);
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      PhaseGVN& gvn = kit.gvn();
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206
      // Adjust JVMS from post-call to pre-call state: put args on stack
207
      uint nargs = call->method()->arg_size();
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      kit.ensure_stack(kit.sp() + nargs);
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      for (uint i = TypeFunc::Parms; i < call->tf()->domain()->cnt(); i++) {
210
        kit.push(call->in(i));
211
      }
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      jvms = kit.sync_jvms();
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214
      Node* new_vbox = nullptr;
215
      {
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        Node* vect = vec_box->in(VectorBoxNode::Value);
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        const TypeInstPtr* vbox_type = vec_box->box_type();
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        const TypeVect* vt = vec_box->vec_type();
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        BasicType elem_bt = vt->element_basic_type();
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        int num_elem = vt->length();
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        new_vbox = kit.box_vector(vect, vbox_type, elem_bt, num_elem, /*deoptimize=*/true);
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        kit.replace_in_map(vec_box, new_vbox);
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      }
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      kit.dec_sp(nargs);
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      jvms = kit.sync_jvms();
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      call->set_req(TypeFunc::Control , kit.control());
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      call->set_req(TypeFunc::I_O     , kit.i_o());
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      call->set_req(TypeFunc::Memory  , kit.reset_memory());
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      call->set_req(TypeFunc::FramePtr, kit.frameptr());
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      call->replace_edge(vec_box, new_vbox);
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236
      C->record_for_igvn(call);
237
    }
238
  }
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240
  // Process debug uses at safepoints
241
  Unique_Node_List safepoints;
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243
  Unique_Node_List worklist;
244
  worklist.push(vec_box);
245
  while (worklist.size() > 0) {
246
    Node* n = worklist.pop();
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    for (DUIterator_Fast imax, i = n->fast_outs(imax); i < imax; i++) {
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      Node* use = n->fast_out(i);
249
      if (use->is_SafePoint()) {
250
        SafePointNode* sfpt = use->as_SafePoint();
251
        if (!sfpt->is_Call() || !sfpt->as_Call()->has_non_debug_use(n)) {
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          safepoints.push(sfpt);
253
        }
254
      } else if (use->is_ConstraintCast()) {
255
        worklist.push(use); // reversed version of Node::uncast()
256
      }
257
    }
258
  }
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260
  ciInstanceKlass* iklass = vec_box->box_type()->instance_klass();
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  int n_fields = iklass->nof_nonstatic_fields();
262
  assert(n_fields == 1, "sanity");
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264
  // If a mask is feeding into safepoint[s], then its value should be
265
  // packed into a boolean/byte vector first, this will simplify the
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  // re-materialization logic for both predicated and non-predicated
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  // targets.
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  bool is_mask = is_vector_mask(iklass);
269
  if (is_mask && vec_value->Opcode() != Op_VectorStoreMask) {
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    const TypeVect* vt = vec_value->bottom_type()->is_vect();
271
    BasicType bt = vt->element_basic_type();
272
    vec_value = gvn.transform(VectorStoreMaskNode::make(gvn, vec_value, bt, vt->length()));
273
  }
274

275
  while (safepoints.size() > 0) {
276
    SafePointNode* sfpt = safepoints.pop()->as_SafePoint();
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278
    uint first_ind = (sfpt->req() - sfpt->jvms()->scloff());
279
    Node* sobj = new SafePointScalarObjectNode(vec_box->box_type(), vec_box, first_ind, sfpt->jvms()->depth(), n_fields);
280
    sobj->init_req(0, C->root());
281
    sfpt->add_req(vec_value);
282

283
    sobj = gvn.transform(sobj);
284

285
    JVMState *jvms = sfpt->jvms();
286

287
    jvms->set_endoff(sfpt->req());
288
    // Now make a pass over the debug information replacing any references
289
    // to the allocated object with vector value.
290
    for (uint i = jvms->debug_start(); i < jvms->debug_end(); i++) {
291
      Node* debug = sfpt->in(i);
292
      if (debug != nullptr && debug->uncast(/*keep_deps*/false) == vec_box) {
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        sfpt->set_req(i, sobj);
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      }
295
    }
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    C->record_for_igvn(sfpt);
297
  }
298
}
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void PhaseVector::expand_vbox_node(VectorBoxNode* vec_box) {
301
  if (vec_box->outcnt() > 0) {
302
    VectorSet visited;
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    Node* vbox = vec_box->in(VectorBoxNode::Box);
304
    Node* vect = vec_box->in(VectorBoxNode::Value);
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    Node* result = expand_vbox_node_helper(vbox, vect, vec_box->box_type(),
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                                           vec_box->vec_type(), visited);
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    C->gvn_replace_by(vec_box, result);
308
    C->print_method(PHASE_EXPAND_VBOX, 3, vec_box);
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  }
310
  C->remove_macro_node(vec_box);
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}
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Node* PhaseVector::expand_vbox_node_helper(Node* vbox,
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                                           Node* vect,
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                                           const TypeInstPtr* box_type,
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                                           const TypeVect* vect_type,
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                                           VectorSet &visited) {
318
  // JDK-8304948 shows an example that there may be a cycle in the graph.
319
  if (visited.test_set(vbox->_idx)) {
320
    assert(vbox->is_Phi(), "should be phi");
321
    return vbox; // already visited
322
  }
323

324
  // Handle the case when the allocation input to VectorBoxNode is a Proj.
325
  // This is the normal case before expanding.
326
  if (vbox->is_Proj() && vbox->in(0)->Opcode() == Op_VectorBoxAllocate) {
327
    VectorBoxAllocateNode* vbox_alloc = static_cast<VectorBoxAllocateNode*>(vbox->in(0));
328
    return expand_vbox_alloc_node(vbox_alloc, vect, box_type, vect_type);
329
  }
330

331
  // Handle the case when both the allocation input and vector input to
332
  // VectorBoxNode are Phi. This case is generated after the transformation of
333
  // Phi: Phi (VectorBox1 VectorBox2) => VectorBox (Phi1 Phi2).
334
  // With this optimization, the relative two allocation inputs of VectorBox1 and
335
  // VectorBox2 are gathered into Phi1 now. Similarly, the original vector
336
  // inputs of two VectorBox nodes are in Phi2.
337
  //
338
  // See PhiNode::merge_through_phi in cfg.cpp for more details.
339
  if (vbox->is_Phi() && vect->is_Phi()) {
340
    assert(vbox->as_Phi()->region() == vect->as_Phi()->region(), "");
341
    for (uint i = 1; i < vbox->req(); i++) {
342
      Node* new_box = expand_vbox_node_helper(vbox->in(i), vect->in(i),
343
                                              box_type, vect_type, visited);
344
      if (!new_box->is_Phi()) {
345
        C->initial_gvn()->hash_delete(vbox);
346
        vbox->set_req(i, new_box);
347
      }
348
    }
349
    return C->initial_gvn()->transform(vbox);
350
  }
351

352
  // Handle the case when the allocation input to VectorBoxNode is a phi
353
  // but the vector input is not, which can definitely be the case if the
354
  // vector input has been value-numbered. It seems to be safe to do by
355
  // construction because VectorBoxNode and VectorBoxAllocate come in a
356
  // specific order as a result of expanding an intrinsic call. After that, if
357
  // any of the inputs to VectorBoxNode are value-numbered they can only
358
  // move up and are guaranteed to dominate.
359
  if (vbox->is_Phi() && (vect->is_Vector() || vect->is_LoadVector())) {
360
    for (uint i = 1; i < vbox->req(); i++) {
361
      Node* new_box = expand_vbox_node_helper(vbox->in(i), vect,
362
                                              box_type, vect_type, visited);
363
      if (!new_box->is_Phi()) {
364
        C->initial_gvn()->hash_delete(vbox);
365
        vbox->set_req(i, new_box);
366
      }
367
    }
368
    return C->initial_gvn()->transform(vbox);
369
  }
370

371
  assert(!vbox->is_Phi(), "should be expanded");
372
  // TODO: assert that expanded vbox is initialized with the same value (vect).
373
  return vbox; // already expanded
374
}
375

376
Node* PhaseVector::expand_vbox_alloc_node(VectorBoxAllocateNode* vbox_alloc,
377
                                          Node* value,
378
                                          const TypeInstPtr* box_type,
379
                                          const TypeVect* vect_type) {
380
  JVMState* jvms = clone_jvms(C, vbox_alloc);
381
  GraphKit kit(jvms);
382
  PhaseGVN& gvn = kit.gvn();
383

384
  ciInstanceKlass* box_klass = box_type->instance_klass();
385
  BasicType bt = vect_type->element_basic_type();
386
  int num_elem = vect_type->length();
387

388
  bool is_mask = is_vector_mask(box_klass);
389
  // If boxed mask value is present in a predicate register, it must be
390
  // spilled to a vector though a VectorStoreMaskOperation before actual StoreVector
391
  // operation to vector payload field.
392
  if (is_mask && (value->bottom_type()->isa_vectmask() || bt != T_BOOLEAN)) {
393
    value = gvn.transform(VectorStoreMaskNode::make(gvn, value, bt, num_elem));
394
    // Although type of mask depends on its definition, in terms of storage everything is stored in boolean array.
395
    bt = T_BOOLEAN;
396
    assert(value->bottom_type()->is_vect()->element_basic_type() == bt,
397
           "must be consistent with mask representation");
398
  }
399

400
  // Generate array allocation for the field which holds the values.
401
  const TypeKlassPtr* array_klass = TypeKlassPtr::make(ciTypeArrayKlass::make(bt));
402
  Node* arr = kit.new_array(kit.makecon(array_klass), kit.intcon(num_elem), 1);
403

404
  // Store the vector value into the array.
405
  // (The store should be captured by InitializeNode and turned into initialized store later.)
406
  Node* arr_adr = kit.array_element_address(arr, kit.intcon(0), bt);
407
  const TypePtr* arr_adr_type = arr_adr->bottom_type()->is_ptr();
408
  Node* arr_mem = kit.memory(arr_adr);
409
  Node* vstore = gvn.transform(StoreVectorNode::make(0,
410
                                                     kit.control(),
411
                                                     arr_mem,
412
                                                     arr_adr,
413
                                                     arr_adr_type,
414
                                                     value,
415
                                                     num_elem));
416
  kit.set_memory(vstore, arr_adr_type);
417

418
  C->set_max_vector_size(MAX2(C->max_vector_size(), vect_type->length_in_bytes()));
419

420
  // Generate the allocate for the Vector object.
421
  const TypeKlassPtr* klass_type = box_type->as_klass_type();
422
  Node* klass_node = kit.makecon(klass_type);
423
  Node* vec_obj = kit.new_instance(klass_node);
424

425
  // Store the allocated array into object.
426
  ciField* field = ciEnv::current()->vector_VectorPayload_klass()->get_field_by_name(ciSymbols::payload_name(),
427
                                                                                     ciSymbols::object_signature(),
428
                                                                                     false);
429
  assert(field != nullptr, "");
430
  Node* vec_field = kit.basic_plus_adr(vec_obj, field->offset_in_bytes());
431
  const TypePtr* vec_adr_type = vec_field->bottom_type()->is_ptr();
432

433
  // The store should be captured by InitializeNode and turned into initialized store later.
434
  Node* field_store = gvn.transform(kit.access_store_at(vec_obj,
435
                                                        vec_field,
436
                                                        vec_adr_type,
437
                                                        arr,
438
                                                        TypeOopPtr::make_from_klass(field->type()->as_klass()),
439
                                                        T_OBJECT,
440
                                                        IN_HEAP));
441
  kit.set_memory(field_store, vec_adr_type);
442

443
  kit.replace_call(vbox_alloc, vec_obj, true);
444
  C->remove_macro_node(vbox_alloc);
445

446
  return vec_obj;
447
}
448

449
void PhaseVector::expand_vunbox_node(VectorUnboxNode* vec_unbox) {
450
  if (vec_unbox->outcnt() > 0) {
451
    GraphKit kit;
452
    PhaseGVN& gvn = kit.gvn();
453

454
    Node* obj = vec_unbox->obj();
455
    const TypeInstPtr* tinst = gvn.type(obj)->isa_instptr();
456
    ciInstanceKlass* from_kls = tinst->instance_klass();
457
    const TypeVect* vt = vec_unbox->bottom_type()->is_vect();
458
    BasicType bt = vt->element_basic_type();
459
    BasicType masktype = bt;
460

461
    if (is_vector_mask(from_kls)) {
462
      bt = T_BOOLEAN;
463
    } else if (is_vector_shuffle(from_kls)) {
464
      bt = T_BYTE;
465
    }
466

467
    ciField* field = ciEnv::current()->vector_VectorPayload_klass()->get_field_by_name(ciSymbols::payload_name(),
468
                                                                                       ciSymbols::object_signature(),
469
                                                                                       false);
470
    assert(field != nullptr, "");
471
    int offset = field->offset_in_bytes();
472
    Node* vec_adr = kit.basic_plus_adr(obj, offset);
473

474
    Node* mem = vec_unbox->mem();
475
    Node* ctrl = vec_unbox->in(0);
476
    Node* vec_field_ld;
477
    {
478
      DecoratorSet decorators = MO_UNORDERED | IN_HEAP;
479
      C2AccessValuePtr addr(vec_adr, vec_adr->bottom_type()->is_ptr());
480
      MergeMemNode* local_mem = MergeMemNode::make(mem);
481
      gvn.record_for_igvn(local_mem);
482
      BarrierSetC2* bs = BarrierSet::barrier_set()->barrier_set_c2();
483
      C2OptAccess access(gvn, ctrl, local_mem, decorators, T_OBJECT, obj, addr);
484
      const Type* type = TypeOopPtr::make_from_klass(field->type()->as_klass());
485
      vec_field_ld = bs->load_at(access, type);
486
    }
487

488
    // For proper aliasing, attach concrete payload type.
489
    ciKlass* payload_klass = ciTypeArrayKlass::make(bt);
490
    const Type* payload_type = TypeAryPtr::make_from_klass(payload_klass)->cast_to_ptr_type(TypePtr::NotNull);
491
    vec_field_ld = gvn.transform(new CastPPNode(nullptr, vec_field_ld, payload_type));
492

493
    Node* adr = kit.array_element_address(vec_field_ld, gvn.intcon(0), bt);
494
    const TypePtr* adr_type = adr->bottom_type()->is_ptr();
495
    int num_elem = vt->length();
496
    Node* vec_val_load = LoadVectorNode::make(0,
497
                                              ctrl,
498
                                              mem,
499
                                              adr,
500
                                              adr_type,
501
                                              num_elem,
502
                                              bt);
503
    vec_val_load = gvn.transform(vec_val_load);
504

505
    C->set_max_vector_size(MAX2(C->max_vector_size(), vt->length_in_bytes()));
506

507
    if (is_vector_mask(from_kls)) {
508
      vec_val_load = gvn.transform(new VectorLoadMaskNode(vec_val_load, TypeVect::makemask(masktype, num_elem)));
509
    } else if (is_vector_shuffle(from_kls) && !vec_unbox->is_shuffle_to_vector()) {
510
      assert(vec_unbox->bottom_type()->is_vect()->element_basic_type() == masktype, "expect shuffle type consistency");
511
      vec_val_load = gvn.transform(new VectorLoadShuffleNode(vec_val_load, TypeVect::make(masktype, num_elem)));
512
    }
513

514
    gvn.hash_delete(vec_unbox);
515
    vec_unbox->disconnect_inputs(C);
516
    C->gvn_replace_by(vec_unbox, vec_val_load);
517
  }
518
  C->remove_macro_node(vec_unbox);
519
}
520

521
void PhaseVector::eliminate_vbox_alloc_node(VectorBoxAllocateNode* vbox_alloc) {
522
  JVMState* jvms = clone_jvms(C, vbox_alloc);
523
  GraphKit kit(jvms);
524
  // Remove VBA, but leave a safepoint behind.
525
  // Otherwise, it may end up with a loop without any safepoint polls.
526
  kit.replace_call(vbox_alloc, kit.map(), true);
527
  C->remove_macro_node(vbox_alloc);
528
}
529

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