hotspot/src/share/vm/opto/lcm.cpp
author tonyp
Thu, 21 Aug 2008 23:36:31 -0400
changeset 1388 3677f5f3d66b
parent 1376 f7fc7a708b63
parent 961 7fb3b13d4205
child 1397 6a692b557add
permissions -rw-r--r--
Merge
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/*
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 * Copyright 1998-2008 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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 * CA 95054 USA or visit www.sun.com if you need additional information or
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 * have any questions.
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 *
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 */
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// Optimization - Graph Style
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#include "incls/_precompiled.incl"
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#include "incls/_lcm.cpp.incl"
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//------------------------------implicit_null_check----------------------------
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// Detect implicit-null-check opportunities.  Basically, find NULL checks
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// with suitable memory ops nearby.  Use the memory op to do the NULL check.
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// I can generate a memory op if there is not one nearby.
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// The proj is the control projection for the not-null case.
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// The val is the pointer being checked for nullness.
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void Block::implicit_null_check(PhaseCFG *cfg, Node *proj, Node *val, int allowed_reasons) {
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  // Assume if null check need for 0 offset then always needed
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  // Intel solaris doesn't support any null checks yet and no
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  // mechanism exists (yet) to set the switches at an os_cpu level
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  if( !ImplicitNullChecks || MacroAssembler::needs_explicit_null_check(0)) return;
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  // Make sure the ptr-is-null path appears to be uncommon!
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  float f = end()->as_MachIf()->_prob;
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  if( proj->Opcode() == Op_IfTrue ) f = 1.0f - f;
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  if( f > PROB_UNLIKELY_MAG(4) ) return;
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  uint bidx = 0;                // Capture index of value into memop
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  bool was_store;               // Memory op is a store op
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  // Get the successor block for if the test ptr is non-null
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  Block* not_null_block;  // this one goes with the proj
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  Block* null_block;
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  if (_nodes[_nodes.size()-1] == proj) {
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    null_block     = _succs[0];
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    not_null_block = _succs[1];
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  } else {
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    assert(_nodes[_nodes.size()-2] == proj, "proj is one or the other");
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    not_null_block = _succs[0];
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    null_block     = _succs[1];
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  }
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  // Search the exception block for an uncommon trap.
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  // (See Parse::do_if and Parse::do_ifnull for the reason
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  // we need an uncommon trap.  Briefly, we need a way to
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  // detect failure of this optimization, as in 6366351.)
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  {
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    bool found_trap = false;
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    for (uint i1 = 0; i1 < null_block->_nodes.size(); i1++) {
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      Node* nn = null_block->_nodes[i1];
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      if (nn->is_MachCall() &&
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          nn->as_MachCall()->entry_point() ==
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          SharedRuntime::uncommon_trap_blob()->instructions_begin()) {
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        const Type* trtype = nn->in(TypeFunc::Parms)->bottom_type();
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        if (trtype->isa_int() && trtype->is_int()->is_con()) {
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          jint tr_con = trtype->is_int()->get_con();
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          Deoptimization::DeoptReason reason = Deoptimization::trap_request_reason(tr_con);
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          Deoptimization::DeoptAction action = Deoptimization::trap_request_action(tr_con);
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          assert((int)reason < (int)BitsPerInt, "recode bit map");
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          if (is_set_nth_bit(allowed_reasons, (int) reason)
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              && action != Deoptimization::Action_none) {
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            // This uncommon trap is sure to recompile, eventually.
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            // When that happens, C->too_many_traps will prevent
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            // this transformation from happening again.
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            found_trap = true;
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          }
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        }
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        break;
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      }
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    }
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    if (!found_trap) {
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      // We did not find an uncommon trap.
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      return;
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    }
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  }
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  // Search the successor block for a load or store who's base value is also
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  // the tested value.  There may be several.
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  Node_List *out = new Node_List(Thread::current()->resource_area());
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  MachNode *best = NULL;        // Best found so far
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  for (DUIterator i = val->outs(); val->has_out(i); i++) {
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    Node *m = val->out(i);
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    if( !m->is_Mach() ) continue;
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    MachNode *mach = m->as_Mach();
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    was_store = false;
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    switch( mach->ideal_Opcode() ) {
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    case Op_LoadB:
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    case Op_LoadC:
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    case Op_LoadD:
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    case Op_LoadF:
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    case Op_LoadI:
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    case Op_LoadL:
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    case Op_LoadP:
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    case Op_LoadN:
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    case Op_LoadS:
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    case Op_LoadKlass:
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    case Op_LoadNKlass:
1
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    case Op_LoadRange:
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    case Op_LoadD_unaligned:
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    case Op_LoadL_unaligned:
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      break;
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    case Op_StoreB:
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    case Op_StoreC:
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    case Op_StoreCM:
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    case Op_StoreD:
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    case Op_StoreF:
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    case Op_StoreI:
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    case Op_StoreL:
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    case Op_StoreP:
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    case Op_StoreN:
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      was_store = true;         // Memory op is a store op
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      // Stores will have their address in slot 2 (memory in slot 1).
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      // If the value being nul-checked is in another slot, it means we
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      // are storing the checked value, which does NOT check the value!
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      if( mach->in(2) != val ) continue;
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      break;                    // Found a memory op?
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    case Op_StrComp:
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    case Op_AryEq:
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      // Not a legit memory op for implicit null check regardless of
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      // embedded loads
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      continue;
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    default:                    // Also check for embedded loads
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      if( !mach->needs_anti_dependence_check() )
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        continue;               // Not an memory op; skip it
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      break;
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    }
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    // check if the offset is not too high for implicit exception
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    {
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      intptr_t offset = 0;
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      const TypePtr *adr_type = NULL;  // Do not need this return value here
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      const Node* base = mach->get_base_and_disp(offset, adr_type);
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      if (base == NULL || base == NodeSentinel) {
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        // cannot reason about it; is probably not implicit null exception
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      } else {
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        const TypePtr* tptr = base->bottom_type()->is_ptr();
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        // Give up if offset is not a compile-time constant
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        if( offset == Type::OffsetBot || tptr->_offset == Type::OffsetBot )
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          continue;
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        offset += tptr->_offset; // correct if base is offseted
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        if( MacroAssembler::needs_explicit_null_check(offset) )
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          continue;             // Give up is reference is beyond 4K page size
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      }
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    }
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    // Check ctrl input to see if the null-check dominates the memory op
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    Block *cb = cfg->_bbs[mach->_idx];
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    cb = cb->_idom;             // Always hoist at least 1 block
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    if( !was_store ) {          // Stores can be hoisted only one block
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      while( cb->_dom_depth > (_dom_depth + 1))
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        cb = cb->_idom;         // Hoist loads as far as we want
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      // The non-null-block should dominate the memory op, too. Live
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      // range spilling will insert a spill in the non-null-block if it is
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      // needs to spill the memory op for an implicit null check.
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      if (cb->_dom_depth == (_dom_depth + 1)) {
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        if (cb != not_null_block) continue;
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        cb = cb->_idom;
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      }
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    }
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    if( cb != this ) continue;
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    // Found a memory user; see if it can be hoisted to check-block
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    uint vidx = 0;              // Capture index of value into memop
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    uint j;
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    for( j = mach->req()-1; j > 0; j-- ) {
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      if( mach->in(j) == val ) vidx = j;
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      // Block of memory-op input
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      Block *inb = cfg->_bbs[mach->in(j)->_idx];
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      Block *b = this;          // Start from nul check
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      while( b != inb && b->_dom_depth > inb->_dom_depth )
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   189
        b = b->_idom;           // search upwards for input
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   190
      // See if input dominates null check
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   191
      if( b != inb )
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   192
        break;
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   193
    }
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   194
    if( j > 0 )
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   195
      continue;
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   196
    Block *mb = cfg->_bbs[mach->_idx];
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   197
    // Hoisting stores requires more checks for the anti-dependence case.
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parents:
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   198
    // Give up hoisting if we have to move the store past any load.
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parents:
diff changeset
   199
    if( was_store ) {
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   200
      Block *b = mb;            // Start searching here for a local load
489c9b5090e2 Initial load
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   201
      // mach use (faulting) trying to hoist
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   202
      // n might be blocker to hoisting
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   203
      while( b != this ) {
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   204
        uint k;
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   205
        for( k = 1; k < b->_nodes.size(); k++ ) {
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   206
          Node *n = b->_nodes[k];
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   207
          if( n->needs_anti_dependence_check() &&
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   208
              n->in(LoadNode::Memory) == mach->in(StoreNode::Memory) )
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   209
            break;              // Found anti-dependent load
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   210
        }
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   211
        if( k < b->_nodes.size() )
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   212
          break;                // Found anti-dependent load
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   213
        // Make sure control does not do a merge (would have to check allpaths)
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   214
        if( b->num_preds() != 2 ) break;
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   215
        b = cfg->_bbs[b->pred(1)->_idx]; // Move up to predecessor block
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   216
      }
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   217
      if( b != this ) continue;
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   218
    }
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   219
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   220
    // Make sure this memory op is not already being used for a NullCheck
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   221
    Node *e = mb->end();
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   222
    if( e->is_MachNullCheck() && e->in(1) == mach )
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   223
      continue;                 // Already being used as a NULL check
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   224
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   225
    // Found a candidate!  Pick one with least dom depth - the highest
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   226
    // in the dom tree should be closest to the null check.
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   227
    if( !best ||
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   228
        cfg->_bbs[mach->_idx]->_dom_depth < cfg->_bbs[best->_idx]->_dom_depth ) {
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   229
      best = mach;
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   230
      bidx = vidx;
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parents:
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   231
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   232
    }
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   233
  }
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   234
  // No candidate!
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   235
  if( !best ) return;
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   236
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   237
  // ---- Found an implicit null check
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   238
  extern int implicit_null_checks;
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   239
  implicit_null_checks++;
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   240
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   241
  // Hoist the memory candidate up to the end of the test block.
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   242
  Block *old_block = cfg->_bbs[best->_idx];
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   243
  old_block->find_remove(best);
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   244
  add_inst(best);
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   245
  cfg->_bbs.map(best->_idx,this);
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parents:
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   246
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   247
  // Move the control dependence
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   248
  if (best->in(0) && best->in(0) == old_block->_nodes[0])
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   249
    best->set_req(0, _nodes[0]);
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   250
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   251
  // Check for flag-killing projections that also need to be hoisted
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   252
  // Should be DU safe because no edge updates.
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   253
  for (DUIterator_Fast jmax, j = best->fast_outs(jmax); j < jmax; j++) {
489c9b5090e2 Initial load
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   254
    Node* n = best->fast_out(j);
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   255
    if( n->Opcode() == Op_MachProj ) {
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parents:
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   256
      cfg->_bbs[n->_idx]->find_remove(n);
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   257
      add_inst(n);
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   258
      cfg->_bbs.map(n->_idx,this);
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   259
    }
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   260
  }
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parents:
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   261
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   262
  Compile *C = cfg->C;
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   263
  // proj==Op_True --> ne test; proj==Op_False --> eq test.
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parents:
diff changeset
   264
  // One of two graph shapes got matched:
489c9b5090e2 Initial load
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   265
  //   (IfTrue  (If (Bool NE (CmpP ptr NULL))))
489c9b5090e2 Initial load
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parents:
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   266
  //   (IfFalse (If (Bool EQ (CmpP ptr NULL))))
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   267
  // NULL checks are always branch-if-eq.  If we see a IfTrue projection
489c9b5090e2 Initial load
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parents:
diff changeset
   268
  // then we are replacing a 'ne' test with a 'eq' NULL check test.
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parents:
diff changeset
   269
  // We need to flip the projections to keep the same semantics.
489c9b5090e2 Initial load
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parents:
diff changeset
   270
  if( proj->Opcode() == Op_IfTrue ) {
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parents:
diff changeset
   271
    // Swap order of projections in basic block to swap branch targets
489c9b5090e2 Initial load
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parents:
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   272
    Node *tmp1 = _nodes[end_idx()+1];
489c9b5090e2 Initial load
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parents:
diff changeset
   273
    Node *tmp2 = _nodes[end_idx()+2];
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parents:
diff changeset
   274
    _nodes.map(end_idx()+1, tmp2);
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parents:
diff changeset
   275
    _nodes.map(end_idx()+2, tmp1);
489c9b5090e2 Initial load
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parents:
diff changeset
   276
    Node *tmp = new (C, 1) Node(C->top()); // Use not NULL input
489c9b5090e2 Initial load
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parents:
diff changeset
   277
    tmp1->replace_by(tmp);
489c9b5090e2 Initial load
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parents:
diff changeset
   278
    tmp2->replace_by(tmp1);
489c9b5090e2 Initial load
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parents:
diff changeset
   279
    tmp->replace_by(tmp2);
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parents:
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   280
    tmp->destruct();
489c9b5090e2 Initial load
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diff changeset
   281
  }
489c9b5090e2 Initial load
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parents:
diff changeset
   282
489c9b5090e2 Initial load
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parents:
diff changeset
   283
  // Remove the existing null check; use a new implicit null check instead.
489c9b5090e2 Initial load
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parents:
diff changeset
   284
  // Since schedule-local needs precise def-use info, we need to correct
489c9b5090e2 Initial load
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parents:
diff changeset
   285
  // it as well.
489c9b5090e2 Initial load
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parents:
diff changeset
   286
  Node *old_tst = proj->in(0);
489c9b5090e2 Initial load
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   287
  MachNode *nul_chk = new (C) MachNullCheckNode(old_tst->in(0),best,bidx);
489c9b5090e2 Initial load
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parents:
diff changeset
   288
  _nodes.map(end_idx(),nul_chk);
489c9b5090e2 Initial load
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parents:
diff changeset
   289
  cfg->_bbs.map(nul_chk->_idx,this);
489c9b5090e2 Initial load
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parents:
diff changeset
   290
  // Redirect users of old_test to nul_chk
489c9b5090e2 Initial load
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parents:
diff changeset
   291
  for (DUIterator_Last i2min, i2 = old_tst->last_outs(i2min); i2 >= i2min; --i2)
489c9b5090e2 Initial load
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parents:
diff changeset
   292
    old_tst->last_out(i2)->set_req(0, nul_chk);
489c9b5090e2 Initial load
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parents:
diff changeset
   293
  // Clean-up any dead code
489c9b5090e2 Initial load
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parents:
diff changeset
   294
  for (uint i3 = 0; i3 < old_tst->req(); i3++)
489c9b5090e2 Initial load
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parents:
diff changeset
   295
    old_tst->set_req(i3, NULL);
489c9b5090e2 Initial load
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parents:
diff changeset
   296
489c9b5090e2 Initial load
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parents:
diff changeset
   297
  cfg->latency_from_uses(nul_chk);
489c9b5090e2 Initial load
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parents:
diff changeset
   298
  cfg->latency_from_uses(best);
489c9b5090e2 Initial load
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parents:
diff changeset
   299
}
489c9b5090e2 Initial load
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parents:
diff changeset
   300
489c9b5090e2 Initial load
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parents:
diff changeset
   301
489c9b5090e2 Initial load
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parents:
diff changeset
   302
//------------------------------select-----------------------------------------
489c9b5090e2 Initial load
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parents:
diff changeset
   303
// Select a nice fellow from the worklist to schedule next. If there is only
489c9b5090e2 Initial load
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parents:
diff changeset
   304
// one choice, then use it. Projections take top priority for correctness
489c9b5090e2 Initial load
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parents:
diff changeset
   305
// reasons - if I see a projection, then it is next.  There are a number of
489c9b5090e2 Initial load
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parents:
diff changeset
   306
// other special cases, for instructions that consume condition codes, et al.
489c9b5090e2 Initial load
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parents:
diff changeset
   307
// These are chosen immediately. Some instructions are required to immediately
489c9b5090e2 Initial load
duke
parents:
diff changeset
   308
// precede the last instruction in the block, and these are taken last. Of the
489c9b5090e2 Initial load
duke
parents:
diff changeset
   309
// remaining cases (most), choose the instruction with the greatest latency
489c9b5090e2 Initial load
duke
parents:
diff changeset
   310
// (that is, the most number of pseudo-cycles required to the end of the
489c9b5090e2 Initial load
duke
parents:
diff changeset
   311
// routine). If there is a tie, choose the instruction with the most inputs.
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parents:
diff changeset
   312
Node *Block::select(PhaseCFG *cfg, Node_List &worklist, int *ready_cnt, VectorSet &next_call, uint sched_slot) {
489c9b5090e2 Initial load
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parents:
diff changeset
   313
489c9b5090e2 Initial load
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parents:
diff changeset
   314
  // If only a single entry on the stack, use it
489c9b5090e2 Initial load
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parents:
diff changeset
   315
  uint cnt = worklist.size();
489c9b5090e2 Initial load
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parents:
diff changeset
   316
  if (cnt == 1) {
489c9b5090e2 Initial load
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parents:
diff changeset
   317
    Node *n = worklist[0];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   318
    worklist.map(0,worklist.pop());
489c9b5090e2 Initial load
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parents:
diff changeset
   319
    return n;
489c9b5090e2 Initial load
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parents:
diff changeset
   320
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   321
489c9b5090e2 Initial load
duke
parents:
diff changeset
   322
  uint choice  = 0; // Bigger is most important
489c9b5090e2 Initial load
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parents:
diff changeset
   323
  uint latency = 0; // Bigger is scheduled first
489c9b5090e2 Initial load
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parents:
diff changeset
   324
  uint score   = 0; // Bigger is better
961
7fb3b13d4205 6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents: 670
diff changeset
   325
  int idx = -1;     // Index in worklist
1
489c9b5090e2 Initial load
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parents:
diff changeset
   326
489c9b5090e2 Initial load
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parents:
diff changeset
   327
  for( uint i=0; i<cnt; i++ ) { // Inspect entire worklist
489c9b5090e2 Initial load
duke
parents:
diff changeset
   328
    // Order in worklist is used to break ties.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   329
    // See caller for how this is used to delay scheduling
489c9b5090e2 Initial load
duke
parents:
diff changeset
   330
    // of induction variable increments to after the other
489c9b5090e2 Initial load
duke
parents:
diff changeset
   331
    // uses of the phi are scheduled.
489c9b5090e2 Initial load
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parents:
diff changeset
   332
    Node *n = worklist[i];      // Get Node on worklist
489c9b5090e2 Initial load
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parents:
diff changeset
   333
489c9b5090e2 Initial load
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parents:
diff changeset
   334
    int iop = n->is_Mach() ? n->as_Mach()->ideal_Opcode() : 0;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   335
    if( n->is_Proj() ||         // Projections always win
489c9b5090e2 Initial load
duke
parents:
diff changeset
   336
        n->Opcode()== Op_Con || // So does constant 'Top'
489c9b5090e2 Initial load
duke
parents:
diff changeset
   337
        iop == Op_CreateEx ||   // Create-exception must start block
489c9b5090e2 Initial load
duke
parents:
diff changeset
   338
        iop == Op_CheckCastPP
489c9b5090e2 Initial load
duke
parents:
diff changeset
   339
        ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   340
      worklist.map(i,worklist.pop());
489c9b5090e2 Initial load
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parents:
diff changeset
   341
      return n;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   342
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   343
489c9b5090e2 Initial load
duke
parents:
diff changeset
   344
    // Final call in a block must be adjacent to 'catch'
489c9b5090e2 Initial load
duke
parents:
diff changeset
   345
    Node *e = end();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   346
    if( e->is_Catch() && e->in(0)->in(0) == n )
489c9b5090e2 Initial load
duke
parents:
diff changeset
   347
      continue;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   348
489c9b5090e2 Initial load
duke
parents:
diff changeset
   349
    // Memory op for an implicit null check has to be at the end of the block
489c9b5090e2 Initial load
duke
parents:
diff changeset
   350
    if( e->is_MachNullCheck() && e->in(1) == n )
489c9b5090e2 Initial load
duke
parents:
diff changeset
   351
      continue;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   352
489c9b5090e2 Initial load
duke
parents:
diff changeset
   353
    uint n_choice  = 2;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   354
489c9b5090e2 Initial load
duke
parents:
diff changeset
   355
    // See if this instruction is consumed by a branch. If so, then (as the
489c9b5090e2 Initial load
duke
parents:
diff changeset
   356
    // branch is the last instruction in the basic block) force it to the
489c9b5090e2 Initial load
duke
parents:
diff changeset
   357
    // end of the basic block
489c9b5090e2 Initial load
duke
parents:
diff changeset
   358
    if ( must_clone[iop] ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   359
      // See if any use is a branch
489c9b5090e2 Initial load
duke
parents:
diff changeset
   360
      bool found_machif = false;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   361
489c9b5090e2 Initial load
duke
parents:
diff changeset
   362
      for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   363
        Node* use = n->fast_out(j);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   364
489c9b5090e2 Initial load
duke
parents:
diff changeset
   365
        // The use is a conditional branch, make them adjacent
489c9b5090e2 Initial load
duke
parents:
diff changeset
   366
        if (use->is_MachIf() && cfg->_bbs[use->_idx]==this ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   367
          found_machif = true;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   368
          break;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   369
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   370
489c9b5090e2 Initial load
duke
parents:
diff changeset
   371
        // More than this instruction pending for successor to be ready,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   372
        // don't choose this if other opportunities are ready
489c9b5090e2 Initial load
duke
parents:
diff changeset
   373
        if (ready_cnt[use->_idx] > 1)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   374
          n_choice = 1;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   375
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   376
489c9b5090e2 Initial load
duke
parents:
diff changeset
   377
      // loop terminated, prefer not to use this instruction
489c9b5090e2 Initial load
duke
parents:
diff changeset
   378
      if (found_machif)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   379
        continue;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   380
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   381
489c9b5090e2 Initial load
duke
parents:
diff changeset
   382
    // See if this has a predecessor that is "must_clone", i.e. sets the
489c9b5090e2 Initial load
duke
parents:
diff changeset
   383
    // condition code. If so, choose this first
489c9b5090e2 Initial load
duke
parents:
diff changeset
   384
    for (uint j = 0; j < n->req() ; j++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   385
      Node *inn = n->in(j);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   386
      if (inn) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   387
        if (inn->is_Mach() && must_clone[inn->as_Mach()->ideal_Opcode()] ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   388
          n_choice = 3;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   389
          break;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   390
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   391
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   392
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   393
489c9b5090e2 Initial load
duke
parents:
diff changeset
   394
    // MachTemps should be scheduled last so they are near their uses
489c9b5090e2 Initial load
duke
parents:
diff changeset
   395
    if (n->is_MachTemp()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   396
      n_choice = 1;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   397
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   398
489c9b5090e2 Initial load
duke
parents:
diff changeset
   399
    uint n_latency = cfg->_node_latency.at_grow(n->_idx);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   400
    uint n_score   = n->req();   // Many inputs get high score to break ties
489c9b5090e2 Initial load
duke
parents:
diff changeset
   401
489c9b5090e2 Initial load
duke
parents:
diff changeset
   402
    // Keep best latency found
489c9b5090e2 Initial load
duke
parents:
diff changeset
   403
    if( choice < n_choice ||
489c9b5090e2 Initial load
duke
parents:
diff changeset
   404
        ( choice == n_choice &&
489c9b5090e2 Initial load
duke
parents:
diff changeset
   405
          ( latency < n_latency ||
489c9b5090e2 Initial load
duke
parents:
diff changeset
   406
            ( latency == n_latency &&
489c9b5090e2 Initial load
duke
parents:
diff changeset
   407
              ( score < n_score ))))) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   408
      choice  = n_choice;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   409
      latency = n_latency;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   410
      score   = n_score;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   411
      idx     = i;               // Also keep index in worklist
489c9b5090e2 Initial load
duke
parents:
diff changeset
   412
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   413
  } // End of for all ready nodes in worklist
489c9b5090e2 Initial load
duke
parents:
diff changeset
   414
961
7fb3b13d4205 6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents: 670
diff changeset
   415
  assert(idx >= 0, "index should be set");
7fb3b13d4205 6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents: 670
diff changeset
   416
  Node *n = worklist[(uint)idx];      // Get the winner
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   417
961
7fb3b13d4205 6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents: 670
diff changeset
   418
  worklist.map((uint)idx, worklist.pop());     // Compress worklist
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   419
  return n;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   420
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   421
489c9b5090e2 Initial load
duke
parents:
diff changeset
   422
489c9b5090e2 Initial load
duke
parents:
diff changeset
   423
//------------------------------set_next_call----------------------------------
489c9b5090e2 Initial load
duke
parents:
diff changeset
   424
void Block::set_next_call( Node *n, VectorSet &next_call, Block_Array &bbs ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   425
  if( next_call.test_set(n->_idx) ) return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   426
  for( uint i=0; i<n->len(); i++ ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   427
    Node *m = n->in(i);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   428
    if( !m ) continue;  // must see all nodes in block that precede call
489c9b5090e2 Initial load
duke
parents:
diff changeset
   429
    if( bbs[m->_idx] == this )
489c9b5090e2 Initial load
duke
parents:
diff changeset
   430
      set_next_call( m, next_call, bbs );
489c9b5090e2 Initial load
duke
parents:
diff changeset
   431
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   432
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   433
489c9b5090e2 Initial load
duke
parents:
diff changeset
   434
//------------------------------needed_for_next_call---------------------------
489c9b5090e2 Initial load
duke
parents:
diff changeset
   435
// Set the flag 'next_call' for each Node that is needed for the next call to
489c9b5090e2 Initial load
duke
parents:
diff changeset
   436
// be scheduled.  This flag lets me bias scheduling so Nodes needed for the
489c9b5090e2 Initial load
duke
parents:
diff changeset
   437
// next subroutine call get priority - basically it moves things NOT needed
489c9b5090e2 Initial load
duke
parents:
diff changeset
   438
// for the next call till after the call.  This prevents me from trying to
489c9b5090e2 Initial load
duke
parents:
diff changeset
   439
// carry lots of stuff live across a call.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   440
void Block::needed_for_next_call(Node *this_call, VectorSet &next_call, Block_Array &bbs) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   441
  // Find the next control-defining Node in this block
489c9b5090e2 Initial load
duke
parents:
diff changeset
   442
  Node* call = NULL;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   443
  for (DUIterator_Fast imax, i = this_call->fast_outs(imax); i < imax; i++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   444
    Node* m = this_call->fast_out(i);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   445
    if( bbs[m->_idx] == this && // Local-block user
489c9b5090e2 Initial load
duke
parents:
diff changeset
   446
        m != this_call &&       // Not self-start node
489c9b5090e2 Initial load
duke
parents:
diff changeset
   447
        m->is_Call() )
489c9b5090e2 Initial load
duke
parents:
diff changeset
   448
      call = m;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   449
      break;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   450
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   451
  if (call == NULL)  return;    // No next call (e.g., block end is near)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   452
  // Set next-call for all inputs to this call
489c9b5090e2 Initial load
duke
parents:
diff changeset
   453
  set_next_call(call, next_call, bbs);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   454
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   455
489c9b5090e2 Initial load
duke
parents:
diff changeset
   456
//------------------------------sched_call-------------------------------------
489c9b5090e2 Initial load
duke
parents:
diff changeset
   457
uint Block::sched_call( Matcher &matcher, Block_Array &bbs, uint node_cnt, Node_List &worklist, int *ready_cnt, MachCallNode *mcall, VectorSet &next_call ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   458
  RegMask regs;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   459
489c9b5090e2 Initial load
duke
parents:
diff changeset
   460
  // Schedule all the users of the call right now.  All the users are
489c9b5090e2 Initial load
duke
parents:
diff changeset
   461
  // projection Nodes, so they must be scheduled next to the call.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   462
  // Collect all the defined registers.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   463
  for (DUIterator_Fast imax, i = mcall->fast_outs(imax); i < imax; i++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   464
    Node* n = mcall->fast_out(i);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   465
    assert( n->Opcode()==Op_MachProj, "" );
489c9b5090e2 Initial load
duke
parents:
diff changeset
   466
    --ready_cnt[n->_idx];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   467
    assert( !ready_cnt[n->_idx], "" );
489c9b5090e2 Initial load
duke
parents:
diff changeset
   468
    // Schedule next to call
489c9b5090e2 Initial load
duke
parents:
diff changeset
   469
    _nodes.map(node_cnt++, n);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   470
    // Collect defined registers
489c9b5090e2 Initial load
duke
parents:
diff changeset
   471
    regs.OR(n->out_RegMask());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   472
    // Check for scheduling the next control-definer
489c9b5090e2 Initial load
duke
parents:
diff changeset
   473
    if( n->bottom_type() == Type::CONTROL )
489c9b5090e2 Initial load
duke
parents:
diff changeset
   474
      // Warm up next pile of heuristic bits
489c9b5090e2 Initial load
duke
parents:
diff changeset
   475
      needed_for_next_call(n, next_call, bbs);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   476
489c9b5090e2 Initial load
duke
parents:
diff changeset
   477
    // Children of projections are now all ready
489c9b5090e2 Initial load
duke
parents:
diff changeset
   478
    for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   479
      Node* m = n->fast_out(j); // Get user
489c9b5090e2 Initial load
duke
parents:
diff changeset
   480
      if( bbs[m->_idx] != this ) continue;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   481
      if( m->is_Phi() ) continue;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   482
      if( !--ready_cnt[m->_idx] )
489c9b5090e2 Initial load
duke
parents:
diff changeset
   483
        worklist.push(m);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   484
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   485
489c9b5090e2 Initial load
duke
parents:
diff changeset
   486
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   487
489c9b5090e2 Initial load
duke
parents:
diff changeset
   488
  // Act as if the call defines the Frame Pointer.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   489
  // Certainly the FP is alive and well after the call.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   490
  regs.Insert(matcher.c_frame_pointer());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   491
489c9b5090e2 Initial load
duke
parents:
diff changeset
   492
  // Set all registers killed and not already defined by the call.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   493
  uint r_cnt = mcall->tf()->range()->cnt();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   494
  int op = mcall->ideal_Opcode();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   495
  MachProjNode *proj = new (matcher.C, 1) MachProjNode( mcall, r_cnt+1, RegMask::Empty, MachProjNode::fat_proj );
489c9b5090e2 Initial load
duke
parents:
diff changeset
   496
  bbs.map(proj->_idx,this);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   497
  _nodes.insert(node_cnt++, proj);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   498
489c9b5090e2 Initial load
duke
parents:
diff changeset
   499
  // Select the right register save policy.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   500
  const char * save_policy;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   501
  switch (op) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   502
    case Op_CallRuntime:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   503
    case Op_CallLeaf:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   504
    case Op_CallLeafNoFP:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   505
      // Calling C code so use C calling convention
489c9b5090e2 Initial load
duke
parents:
diff changeset
   506
      save_policy = matcher._c_reg_save_policy;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   507
      break;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   508
489c9b5090e2 Initial load
duke
parents:
diff changeset
   509
    case Op_CallStaticJava:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   510
    case Op_CallDynamicJava:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   511
      // Calling Java code so use Java calling convention
489c9b5090e2 Initial load
duke
parents:
diff changeset
   512
      save_policy = matcher._register_save_policy;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   513
      break;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   514
489c9b5090e2 Initial load
duke
parents:
diff changeset
   515
    default:
489c9b5090e2 Initial load
duke
parents:
diff changeset
   516
      ShouldNotReachHere();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   517
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   518
489c9b5090e2 Initial load
duke
parents:
diff changeset
   519
  // When using CallRuntime mark SOE registers as killed by the call
489c9b5090e2 Initial load
duke
parents:
diff changeset
   520
  // so values that could show up in the RegisterMap aren't live in a
489c9b5090e2 Initial load
duke
parents:
diff changeset
   521
  // callee saved register since the register wouldn't know where to
489c9b5090e2 Initial load
duke
parents:
diff changeset
   522
  // find them.  CallLeaf and CallLeafNoFP are ok because they can't
489c9b5090e2 Initial load
duke
parents:
diff changeset
   523
  // have debug info on them.  Strictly speaking this only needs to be
489c9b5090e2 Initial load
duke
parents:
diff changeset
   524
  // done for oops since idealreg2debugmask takes care of debug info
489c9b5090e2 Initial load
duke
parents:
diff changeset
   525
  // references but there no way to handle oops differently than other
489c9b5090e2 Initial load
duke
parents:
diff changeset
   526
  // pointers as far as the kill mask goes.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   527
  bool exclude_soe = op == Op_CallRuntime;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   528
489c9b5090e2 Initial load
duke
parents:
diff changeset
   529
  // Fill in the kill mask for the call
489c9b5090e2 Initial load
duke
parents:
diff changeset
   530
  for( OptoReg::Name r = OptoReg::Name(0); r < _last_Mach_Reg; r=OptoReg::add(r,1) ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   531
    if( !regs.Member(r) ) {     // Not already defined by the call
489c9b5090e2 Initial load
duke
parents:
diff changeset
   532
      // Save-on-call register?
489c9b5090e2 Initial load
duke
parents:
diff changeset
   533
      if ((save_policy[r] == 'C') ||
489c9b5090e2 Initial load
duke
parents:
diff changeset
   534
          (save_policy[r] == 'A') ||
489c9b5090e2 Initial load
duke
parents:
diff changeset
   535
          ((save_policy[r] == 'E') && exclude_soe)) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   536
        proj->_rout.Insert(r);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   537
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   538
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   539
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   540
489c9b5090e2 Initial load
duke
parents:
diff changeset
   541
  return node_cnt;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   542
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   543
489c9b5090e2 Initial load
duke
parents:
diff changeset
   544
489c9b5090e2 Initial load
duke
parents:
diff changeset
   545
//------------------------------schedule_local---------------------------------
489c9b5090e2 Initial load
duke
parents:
diff changeset
   546
// Topological sort within a block.  Someday become a real scheduler.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   547
bool Block::schedule_local(PhaseCFG *cfg, Matcher &matcher, int *ready_cnt, VectorSet &next_call) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   548
  // Already "sorted" are the block start Node (as the first entry), and
489c9b5090e2 Initial load
duke
parents:
diff changeset
   549
  // the block-ending Node and any trailing control projections.  We leave
489c9b5090e2 Initial load
duke
parents:
diff changeset
   550
  // these alone.  PhiNodes and ParmNodes are made to follow the block start
489c9b5090e2 Initial load
duke
parents:
diff changeset
   551
  // Node.  Everything else gets topo-sorted.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   552
489c9b5090e2 Initial load
duke
parents:
diff changeset
   553
#ifndef PRODUCT
489c9b5090e2 Initial load
duke
parents:
diff changeset
   554
    if (cfg->trace_opto_pipelining()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   555
      tty->print_cr("# --- schedule_local B%d, before: ---", _pre_order);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   556
      for (uint i = 0;i < _nodes.size();i++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   557
        tty->print("# ");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   558
        _nodes[i]->fast_dump();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   559
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   560
      tty->print_cr("#");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   561
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   562
#endif
489c9b5090e2 Initial load
duke
parents:
diff changeset
   563
489c9b5090e2 Initial load
duke
parents:
diff changeset
   564
  // RootNode is already sorted
489c9b5090e2 Initial load
duke
parents:
diff changeset
   565
  if( _nodes.size() == 1 ) return true;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   566
489c9b5090e2 Initial load
duke
parents:
diff changeset
   567
  // Move PhiNodes and ParmNodes from 1 to cnt up to the start
489c9b5090e2 Initial load
duke
parents:
diff changeset
   568
  uint node_cnt = end_idx();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   569
  uint phi_cnt = 1;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   570
  uint i;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   571
  for( i = 1; i<node_cnt; i++ ) { // Scan for Phi
489c9b5090e2 Initial load
duke
parents:
diff changeset
   572
    Node *n = _nodes[i];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   573
    if( n->is_Phi() ||          // Found a PhiNode or ParmNode
489c9b5090e2 Initial load
duke
parents:
diff changeset
   574
        (n->is_Proj()  && n->in(0) == head()) ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   575
      // Move guy at 'phi_cnt' to the end; makes a hole at phi_cnt
489c9b5090e2 Initial load
duke
parents:
diff changeset
   576
      _nodes.map(i,_nodes[phi_cnt]);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   577
      _nodes.map(phi_cnt++,n);  // swap Phi/Parm up front
489c9b5090e2 Initial load
duke
parents:
diff changeset
   578
    } else {                    // All others
489c9b5090e2 Initial load
duke
parents:
diff changeset
   579
      // Count block-local inputs to 'n'
489c9b5090e2 Initial load
duke
parents:
diff changeset
   580
      uint cnt = n->len();      // Input count
489c9b5090e2 Initial load
duke
parents:
diff changeset
   581
      uint local = 0;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   582
      for( uint j=0; j<cnt; j++ ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   583
        Node *m = n->in(j);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   584
        if( m && cfg->_bbs[m->_idx] == this && !m->is_top() )
489c9b5090e2 Initial load
duke
parents:
diff changeset
   585
          local++;              // One more block-local input
489c9b5090e2 Initial load
duke
parents:
diff changeset
   586
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   587
      ready_cnt[n->_idx] = local; // Count em up
489c9b5090e2 Initial load
duke
parents:
diff changeset
   588
489c9b5090e2 Initial load
duke
parents:
diff changeset
   589
      // A few node types require changing a required edge to a precedence edge
489c9b5090e2 Initial load
duke
parents:
diff changeset
   590
      // before allocation.
1374
4c24294029a9 6711316: Open source the Garbage-First garbage collector
ysr
parents: 372
diff changeset
   591
      if( UseConcMarkSweepGC || UseG1GC ) {
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   592
        if( n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_StoreCM ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   593
          // Note: Required edges with an index greater than oper_input_base
489c9b5090e2 Initial load
duke
parents:
diff changeset
   594
          // are not supported by the allocator.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   595
          // Note2: Can only depend on unmatched edge being last,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   596
          // can not depend on its absolute position.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   597
          Node *oop_store = n->in(n->req() - 1);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   598
          n->del_req(n->req() - 1);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   599
          n->add_prec(oop_store);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   600
          assert(cfg->_bbs[oop_store->_idx]->_dom_depth <= this->_dom_depth, "oop_store must dominate card-mark");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   601
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   602
      }
961
7fb3b13d4205 6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents: 670
diff changeset
   603
      if( n->is_Mach() && n->as_Mach()->ideal_Opcode() == Op_MemBarAcquire &&
7fb3b13d4205 6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents: 670
diff changeset
   604
          n->req() > TypeFunc::Parms ) {
7fb3b13d4205 6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents: 670
diff changeset
   605
        // MemBarAcquire could be created without Precedent edge.
7fb3b13d4205 6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents: 670
diff changeset
   606
        // del_req() replaces the specified edge with the last input edge
7fb3b13d4205 6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents: 670
diff changeset
   607
        // and then removes the last edge. If the specified edge > number of
7fb3b13d4205 6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents: 670
diff changeset
   608
        // edges the last edge will be moved outside of the input edges array
7fb3b13d4205 6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents: 670
diff changeset
   609
        // and the edge will be lost. This is why this code should be
7fb3b13d4205 6726999: nsk/stress/jck12a/jck12a010 assert(n != null,"Bad immediate dominator info.")
kvn
parents: 670
diff changeset
   610
        // executed only when Precedent (== TypeFunc::Parms) edge is present.
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   611
        Node *x = n->in(TypeFunc::Parms);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   612
        n->del_req(TypeFunc::Parms);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   613
        n->add_prec(x);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   614
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   615
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   616
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   617
  for(uint i2=i; i2<_nodes.size(); i2++ ) // Trailing guys get zapped count
489c9b5090e2 Initial load
duke
parents:
diff changeset
   618
    ready_cnt[_nodes[i2]->_idx] = 0;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   619
489c9b5090e2 Initial load
duke
parents:
diff changeset
   620
  // All the prescheduled guys do not hold back internal nodes
489c9b5090e2 Initial load
duke
parents:
diff changeset
   621
  uint i3;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   622
  for(i3 = 0; i3<phi_cnt; i3++ ) {  // For all pre-scheduled
489c9b5090e2 Initial load
duke
parents:
diff changeset
   623
    Node *n = _nodes[i3];       // Get pre-scheduled
489c9b5090e2 Initial load
duke
parents:
diff changeset
   624
    for (DUIterator_Fast jmax, j = n->fast_outs(jmax); j < jmax; j++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   625
      Node* m = n->fast_out(j);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   626
      if( cfg->_bbs[m->_idx] ==this ) // Local-block user
489c9b5090e2 Initial load
duke
parents:
diff changeset
   627
        ready_cnt[m->_idx]--;   // Fix ready count
489c9b5090e2 Initial load
duke
parents:
diff changeset
   628
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   629
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   630
489c9b5090e2 Initial load
duke
parents:
diff changeset
   631
  Node_List delay;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   632
  // Make a worklist
489c9b5090e2 Initial load
duke
parents:
diff changeset
   633
  Node_List worklist;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   634
  for(uint i4=i3; i4<node_cnt; i4++ ) {    // Put ready guys on worklist
489c9b5090e2 Initial load
duke
parents:
diff changeset
   635
    Node *m = _nodes[i4];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   636
    if( !ready_cnt[m->_idx] ) {   // Zero ready count?
489c9b5090e2 Initial load
duke
parents:
diff changeset
   637
      if (m->is_iteratively_computed()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   638
        // Push induction variable increments last to allow other uses
489c9b5090e2 Initial load
duke
parents:
diff changeset
   639
        // of the phi to be scheduled first. The select() method breaks
489c9b5090e2 Initial load
duke
parents:
diff changeset
   640
        // ties in scheduling by worklist order.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   641
        delay.push(m);
372
b0d8a9fd3646 6601321: Assert(j == 1 || b->_nodes[j-1]->is_Phi(),"CreateEx must be first instruction in block")
never
parents: 360
diff changeset
   642
      } else if (m->is_Mach() && m->as_Mach()->ideal_Opcode() == Op_CreateEx) {
b0d8a9fd3646 6601321: Assert(j == 1 || b->_nodes[j-1]->is_Phi(),"CreateEx must be first instruction in block")
never
parents: 360
diff changeset
   643
        // Force the CreateEx to the top of the list so it's processed
b0d8a9fd3646 6601321: Assert(j == 1 || b->_nodes[j-1]->is_Phi(),"CreateEx must be first instruction in block")
never
parents: 360
diff changeset
   644
        // first and ends up at the start of the block.
b0d8a9fd3646 6601321: Assert(j == 1 || b->_nodes[j-1]->is_Phi(),"CreateEx must be first instruction in block")
never
parents: 360
diff changeset
   645
        worklist.insert(0, m);
1
489c9b5090e2 Initial load
duke
parents:
diff changeset
   646
      } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   647
        worklist.push(m);         // Then on to worklist!
489c9b5090e2 Initial load
duke
parents:
diff changeset
   648
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   649
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   650
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   651
  while (delay.size()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   652
    Node* d = delay.pop();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   653
    worklist.push(d);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   654
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   655
489c9b5090e2 Initial load
duke
parents:
diff changeset
   656
  // Warm up the 'next_call' heuristic bits
489c9b5090e2 Initial load
duke
parents:
diff changeset
   657
  needed_for_next_call(_nodes[0], next_call, cfg->_bbs);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   658
489c9b5090e2 Initial load
duke
parents:
diff changeset
   659
#ifndef PRODUCT
489c9b5090e2 Initial load
duke
parents:
diff changeset
   660
    if (cfg->trace_opto_pipelining()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   661
      for (uint j=0; j<_nodes.size(); j++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   662
        Node     *n = _nodes[j];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   663
        int     idx = n->_idx;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   664
        tty->print("#   ready cnt:%3d  ", ready_cnt[idx]);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   665
        tty->print("latency:%3d  ", cfg->_node_latency.at_grow(idx));
489c9b5090e2 Initial load
duke
parents:
diff changeset
   666
        tty->print("%4d: %s\n", idx, n->Name());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   667
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   668
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   669
#endif
489c9b5090e2 Initial load
duke
parents:
diff changeset
   670
489c9b5090e2 Initial load
duke
parents:
diff changeset
   671
  // Pull from worklist and schedule
489c9b5090e2 Initial load
duke
parents:
diff changeset
   672
  while( worklist.size() ) {    // Worklist is not ready
489c9b5090e2 Initial load
duke
parents:
diff changeset
   673
489c9b5090e2 Initial load
duke
parents:
diff changeset
   674
#ifndef PRODUCT
489c9b5090e2 Initial load
duke
parents:
diff changeset
   675
    if (cfg->trace_opto_pipelining()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   676
      tty->print("#   ready list:");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   677
      for( uint i=0; i<worklist.size(); i++ ) { // Inspect entire worklist
489c9b5090e2 Initial load
duke
parents:
diff changeset
   678
        Node *n = worklist[i];      // Get Node on worklist
489c9b5090e2 Initial load
duke
parents:
diff changeset
   679
        tty->print(" %d", n->_idx);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   680
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   681
      tty->cr();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   682
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   683
#endif
489c9b5090e2 Initial load
duke
parents:
diff changeset
   684
489c9b5090e2 Initial load
duke
parents:
diff changeset
   685
    // Select and pop a ready guy from worklist
489c9b5090e2 Initial load
duke
parents:
diff changeset
   686
    Node* n = select(cfg, worklist, ready_cnt, next_call, phi_cnt);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   687
    _nodes.map(phi_cnt++,n);    // Schedule him next
489c9b5090e2 Initial load
duke
parents:
diff changeset
   688
489c9b5090e2 Initial load
duke
parents:
diff changeset
   689
#ifndef PRODUCT
489c9b5090e2 Initial load
duke
parents:
diff changeset
   690
    if (cfg->trace_opto_pipelining()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   691
      tty->print("#    select %d: %s", n->_idx, n->Name());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   692
      tty->print(", latency:%d", cfg->_node_latency.at_grow(n->_idx));
489c9b5090e2 Initial load
duke
parents:
diff changeset
   693
      n->dump();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   694
      if (Verbose) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   695
        tty->print("#   ready list:");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   696
        for( uint i=0; i<worklist.size(); i++ ) { // Inspect entire worklist
489c9b5090e2 Initial load
duke
parents:
diff changeset
   697
          Node *n = worklist[i];      // Get Node on worklist
489c9b5090e2 Initial load
duke
parents:
diff changeset
   698
          tty->print(" %d", n->_idx);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   699
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   700
        tty->cr();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   701
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   702
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   703
489c9b5090e2 Initial load
duke
parents:
diff changeset
   704
#endif
489c9b5090e2 Initial load
duke
parents:
diff changeset
   705
    if( n->is_MachCall() ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   706
      MachCallNode *mcall = n->as_MachCall();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   707
      phi_cnt = sched_call(matcher, cfg->_bbs, phi_cnt, worklist, ready_cnt, mcall, next_call);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   708
      continue;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   709
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   710
    // Children are now all ready
489c9b5090e2 Initial load
duke
parents:
diff changeset
   711
    for (DUIterator_Fast i5max, i5 = n->fast_outs(i5max); i5 < i5max; i5++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   712
      Node* m = n->fast_out(i5); // Get user
489c9b5090e2 Initial load
duke
parents:
diff changeset
   713
      if( cfg->_bbs[m->_idx] != this ) continue;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   714
      if( m->is_Phi() ) continue;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   715
      if( !--ready_cnt[m->_idx] )
489c9b5090e2 Initial load
duke
parents:
diff changeset
   716
        worklist.push(m);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   717
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   718
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   719
489c9b5090e2 Initial load
duke
parents:
diff changeset
   720
  if( phi_cnt != end_idx() ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   721
    // did not schedule all.  Retry, Bailout, or Die
489c9b5090e2 Initial load
duke
parents:
diff changeset
   722
    Compile* C = matcher.C;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   723
    if (C->subsume_loads() == true && !C->failing()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   724
      // Retry with subsume_loads == false
489c9b5090e2 Initial load
duke
parents:
diff changeset
   725
      // If this is the first failure, the sentinel string will "stick"
489c9b5090e2 Initial load
duke
parents:
diff changeset
   726
      // to the Compile object, and the C2Compiler will see it and retry.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   727
      C->record_failure(C2Compiler::retry_no_subsuming_loads());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   728
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   729
    // assert( phi_cnt == end_idx(), "did not schedule all" );
489c9b5090e2 Initial load
duke
parents:
diff changeset
   730
    return false;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   731
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   732
489c9b5090e2 Initial load
duke
parents:
diff changeset
   733
#ifndef PRODUCT
489c9b5090e2 Initial load
duke
parents:
diff changeset
   734
  if (cfg->trace_opto_pipelining()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   735
    tty->print_cr("#");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   736
    tty->print_cr("# after schedule_local");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   737
    for (uint i = 0;i < _nodes.size();i++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   738
      tty->print("# ");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   739
      _nodes[i]->fast_dump();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   740
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   741
    tty->cr();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   742
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   743
#endif
489c9b5090e2 Initial load
duke
parents:
diff changeset
   744
489c9b5090e2 Initial load
duke
parents:
diff changeset
   745
489c9b5090e2 Initial load
duke
parents:
diff changeset
   746
  return true;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   747
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   748
489c9b5090e2 Initial load
duke
parents:
diff changeset
   749
//--------------------------catch_cleanup_fix_all_inputs-----------------------
489c9b5090e2 Initial load
duke
parents:
diff changeset
   750
static void catch_cleanup_fix_all_inputs(Node *use, Node *old_def, Node *new_def) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   751
  for (uint l = 0; l < use->len(); l++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   752
    if (use->in(l) == old_def) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   753
      if (l < use->req()) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   754
        use->set_req(l, new_def);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   755
      } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   756
        use->rm_prec(l);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   757
        use->add_prec(new_def);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   758
        l--;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   759
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   760
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   761
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   762
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   763
489c9b5090e2 Initial load
duke
parents:
diff changeset
   764
//------------------------------catch_cleanup_find_cloned_def------------------
489c9b5090e2 Initial load
duke
parents:
diff changeset
   765
static Node *catch_cleanup_find_cloned_def(Block *use_blk, Node *def, Block *def_blk, Block_Array &bbs, int n_clone_idx) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   766
  assert( use_blk != def_blk, "Inter-block cleanup only");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   767
489c9b5090e2 Initial load
duke
parents:
diff changeset
   768
  // The use is some block below the Catch.  Find and return the clone of the def
489c9b5090e2 Initial load
duke
parents:
diff changeset
   769
  // that dominates the use. If there is no clone in a dominating block, then
489c9b5090e2 Initial load
duke
parents:
diff changeset
   770
  // create a phi for the def in a dominating block.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   771
489c9b5090e2 Initial load
duke
parents:
diff changeset
   772
  // Find which successor block dominates this use.  The successor
489c9b5090e2 Initial load
duke
parents:
diff changeset
   773
  // blocks must all be single-entry (from the Catch only; I will have
489c9b5090e2 Initial load
duke
parents:
diff changeset
   774
  // split blocks to make this so), hence they all dominate.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   775
  while( use_blk->_dom_depth > def_blk->_dom_depth+1 )
489c9b5090e2 Initial load
duke
parents:
diff changeset
   776
    use_blk = use_blk->_idom;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   777
489c9b5090e2 Initial load
duke
parents:
diff changeset
   778
  // Find the successor
489c9b5090e2 Initial load
duke
parents:
diff changeset
   779
  Node *fixup = NULL;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   780
489c9b5090e2 Initial load
duke
parents:
diff changeset
   781
  uint j;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   782
  for( j = 0; j < def_blk->_num_succs; j++ )
489c9b5090e2 Initial load
duke
parents:
diff changeset
   783
    if( use_blk == def_blk->_succs[j] )
489c9b5090e2 Initial load
duke
parents:
diff changeset
   784
      break;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   785
489c9b5090e2 Initial load
duke
parents:
diff changeset
   786
  if( j == def_blk->_num_succs ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   787
    // Block at same level in dom-tree is not a successor.  It needs a
489c9b5090e2 Initial load
duke
parents:
diff changeset
   788
    // PhiNode, the PhiNode uses from the def and IT's uses need fixup.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   789
    Node_Array inputs = new Node_List(Thread::current()->resource_area());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   790
    for(uint k = 1; k < use_blk->num_preds(); k++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   791
      inputs.map(k, catch_cleanup_find_cloned_def(bbs[use_blk->pred(k)->_idx], def, def_blk, bbs, n_clone_idx));
489c9b5090e2 Initial load
duke
parents:
diff changeset
   792
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   793
489c9b5090e2 Initial load
duke
parents:
diff changeset
   794
    // Check to see if the use_blk already has an identical phi inserted.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   795
    // If it exists, it will be at the first position since all uses of a
489c9b5090e2 Initial load
duke
parents:
diff changeset
   796
    // def are processed together.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   797
    Node *phi = use_blk->_nodes[1];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   798
    if( phi->is_Phi() ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   799
      fixup = phi;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   800
      for (uint k = 1; k < use_blk->num_preds(); k++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   801
        if (phi->in(k) != inputs[k]) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   802
          // Not a match
489c9b5090e2 Initial load
duke
parents:
diff changeset
   803
          fixup = NULL;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   804
          break;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   805
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   806
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   807
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   808
489c9b5090e2 Initial load
duke
parents:
diff changeset
   809
    // If an existing PhiNode was not found, make a new one.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   810
    if (fixup == NULL) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   811
      Node *new_phi = PhiNode::make(use_blk->head(), def);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   812
      use_blk->_nodes.insert(1, new_phi);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   813
      bbs.map(new_phi->_idx, use_blk);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   814
      for (uint k = 1; k < use_blk->num_preds(); k++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   815
        new_phi->set_req(k, inputs[k]);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   816
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   817
      fixup = new_phi;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   818
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   819
489c9b5090e2 Initial load
duke
parents:
diff changeset
   820
  } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   821
    // Found the use just below the Catch.  Make it use the clone.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   822
    fixup = use_blk->_nodes[n_clone_idx];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   823
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   824
489c9b5090e2 Initial load
duke
parents:
diff changeset
   825
  return fixup;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   826
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   827
489c9b5090e2 Initial load
duke
parents:
diff changeset
   828
//--------------------------catch_cleanup_intra_block--------------------------
489c9b5090e2 Initial load
duke
parents:
diff changeset
   829
// Fix all input edges in use that reference "def".  The use is in the same
489c9b5090e2 Initial load
duke
parents:
diff changeset
   830
// block as the def and both have been cloned in each successor block.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   831
static void catch_cleanup_intra_block(Node *use, Node *def, Block *blk, int beg, int n_clone_idx) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   832
489c9b5090e2 Initial load
duke
parents:
diff changeset
   833
  // Both the use and def have been cloned. For each successor block,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   834
  // get the clone of the use, and make its input the clone of the def
489c9b5090e2 Initial load
duke
parents:
diff changeset
   835
  // found in that block.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   836
489c9b5090e2 Initial load
duke
parents:
diff changeset
   837
  uint use_idx = blk->find_node(use);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   838
  uint offset_idx = use_idx - beg;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   839
  for( uint k = 0; k < blk->_num_succs; k++ ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   840
    // Get clone in each successor block
489c9b5090e2 Initial load
duke
parents:
diff changeset
   841
    Block *sb = blk->_succs[k];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   842
    Node *clone = sb->_nodes[offset_idx+1];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   843
    assert( clone->Opcode() == use->Opcode(), "" );
489c9b5090e2 Initial load
duke
parents:
diff changeset
   844
489c9b5090e2 Initial load
duke
parents:
diff changeset
   845
    // Make use-clone reference the def-clone
489c9b5090e2 Initial load
duke
parents:
diff changeset
   846
    catch_cleanup_fix_all_inputs(clone, def, sb->_nodes[n_clone_idx]);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   847
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   848
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   849
489c9b5090e2 Initial load
duke
parents:
diff changeset
   850
//------------------------------catch_cleanup_inter_block---------------------
489c9b5090e2 Initial load
duke
parents:
diff changeset
   851
// Fix all input edges in use that reference "def".  The use is in a different
489c9b5090e2 Initial load
duke
parents:
diff changeset
   852
// block than the def.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   853
static void catch_cleanup_inter_block(Node *use, Block *use_blk, Node *def, Block *def_blk, Block_Array &bbs, int n_clone_idx) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   854
  if( !use_blk ) return;        // Can happen if the use is a precedence edge
489c9b5090e2 Initial load
duke
parents:
diff changeset
   855
489c9b5090e2 Initial load
duke
parents:
diff changeset
   856
  Node *new_def = catch_cleanup_find_cloned_def(use_blk, def, def_blk, bbs, n_clone_idx);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   857
  catch_cleanup_fix_all_inputs(use, def, new_def);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   858
}
489c9b5090e2 Initial load
duke
parents:
diff changeset
   859
489c9b5090e2 Initial load
duke
parents:
diff changeset
   860
//------------------------------call_catch_cleanup-----------------------------
489c9b5090e2 Initial load
duke
parents:
diff changeset
   861
// If we inserted any instructions between a Call and his CatchNode,
489c9b5090e2 Initial load
duke
parents:
diff changeset
   862
// clone the instructions on all paths below the Catch.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   863
void Block::call_catch_cleanup(Block_Array &bbs) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   864
489c9b5090e2 Initial load
duke
parents:
diff changeset
   865
  // End of region to clone
489c9b5090e2 Initial load
duke
parents:
diff changeset
   866
  uint end = end_idx();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   867
  if( !_nodes[end]->is_Catch() ) return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   868
  // Start of region to clone
489c9b5090e2 Initial load
duke
parents:
diff changeset
   869
  uint beg = end;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   870
  while( _nodes[beg-1]->Opcode() != Op_MachProj ||
489c9b5090e2 Initial load
duke
parents:
diff changeset
   871
        !_nodes[beg-1]->in(0)->is_Call() ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   872
    beg--;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   873
    assert(beg > 0,"Catch cleanup walking beyond block boundary");
489c9b5090e2 Initial load
duke
parents:
diff changeset
   874
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   875
  // Range of inserted instructions is [beg, end)
489c9b5090e2 Initial load
duke
parents:
diff changeset
   876
  if( beg == end ) return;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   877
489c9b5090e2 Initial load
duke
parents:
diff changeset
   878
  // Clone along all Catch output paths.  Clone area between the 'beg' and
489c9b5090e2 Initial load
duke
parents:
diff changeset
   879
  // 'end' indices.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   880
  for( uint i = 0; i < _num_succs; i++ ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   881
    Block *sb = _succs[i];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   882
    // Clone the entire area; ignoring the edge fixup for now.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   883
    for( uint j = end; j > beg; j-- ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   884
      Node *clone = _nodes[j-1]->clone();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   885
      sb->_nodes.insert( 1, clone );
489c9b5090e2 Initial load
duke
parents:
diff changeset
   886
      bbs.map(clone->_idx,sb);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   887
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   888
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   889
489c9b5090e2 Initial load
duke
parents:
diff changeset
   890
489c9b5090e2 Initial load
duke
parents:
diff changeset
   891
  // Fixup edges.  Check the def-use info per cloned Node
489c9b5090e2 Initial load
duke
parents:
diff changeset
   892
  for(uint i2 = beg; i2 < end; i2++ ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   893
    uint n_clone_idx = i2-beg+1; // Index of clone of n in each successor block
489c9b5090e2 Initial load
duke
parents:
diff changeset
   894
    Node *n = _nodes[i2];        // Node that got cloned
489c9b5090e2 Initial load
duke
parents:
diff changeset
   895
    // Need DU safe iterator because of edge manipulation in calls.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   896
    Unique_Node_List *out = new Unique_Node_List(Thread::current()->resource_area());
489c9b5090e2 Initial load
duke
parents:
diff changeset
   897
    for (DUIterator_Fast j1max, j1 = n->fast_outs(j1max); j1 < j1max; j1++) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   898
      out->push(n->fast_out(j1));
489c9b5090e2 Initial load
duke
parents:
diff changeset
   899
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   900
    uint max = out->size();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   901
    for (uint j = 0; j < max; j++) {// For all users
489c9b5090e2 Initial load
duke
parents:
diff changeset
   902
      Node *use = out->pop();
489c9b5090e2 Initial load
duke
parents:
diff changeset
   903
      Block *buse = bbs[use->_idx];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   904
      if( use->is_Phi() ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   905
        for( uint k = 1; k < use->req(); k++ )
489c9b5090e2 Initial load
duke
parents:
diff changeset
   906
          if( use->in(k) == n ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   907
            Node *fixup = catch_cleanup_find_cloned_def(bbs[buse->pred(k)->_idx], n, this, bbs, n_clone_idx);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   908
            use->set_req(k, fixup);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   909
          }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   910
      } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   911
        if (this == buse) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   912
          catch_cleanup_intra_block(use, n, this, beg, n_clone_idx);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   913
        } else {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   914
          catch_cleanup_inter_block(use, buse, n, this, bbs, n_clone_idx);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   915
        }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   916
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   917
    } // End for all users
489c9b5090e2 Initial load
duke
parents:
diff changeset
   918
489c9b5090e2 Initial load
duke
parents:
diff changeset
   919
  } // End of for all Nodes in cloned area
489c9b5090e2 Initial load
duke
parents:
diff changeset
   920
489c9b5090e2 Initial load
duke
parents:
diff changeset
   921
  // Remove the now-dead cloned ops
489c9b5090e2 Initial load
duke
parents:
diff changeset
   922
  for(uint i3 = beg; i3 < end; i3++ ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   923
    _nodes[beg]->disconnect_inputs(NULL);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   924
    _nodes.remove(beg);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   925
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   926
489c9b5090e2 Initial load
duke
parents:
diff changeset
   927
  // If the successor blocks have a CreateEx node, move it back to the top
489c9b5090e2 Initial load
duke
parents:
diff changeset
   928
  for(uint i4 = 0; i4 < _num_succs; i4++ ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   929
    Block *sb = _succs[i4];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   930
    uint new_cnt = end - beg;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   931
    // Remove any newly created, but dead, nodes.
489c9b5090e2 Initial load
duke
parents:
diff changeset
   932
    for( uint j = new_cnt; j > 0; j-- ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   933
      Node *n = sb->_nodes[j];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   934
      if (n->outcnt() == 0 &&
489c9b5090e2 Initial load
duke
parents:
diff changeset
   935
          (!n->is_Proj() || n->as_Proj()->in(0)->outcnt() == 1) ){
489c9b5090e2 Initial load
duke
parents:
diff changeset
   936
        n->disconnect_inputs(NULL);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   937
        sb->_nodes.remove(j);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   938
        new_cnt--;
489c9b5090e2 Initial load
duke
parents:
diff changeset
   939
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   940
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   941
    // If any newly created nodes remain, move the CreateEx node to the top
489c9b5090e2 Initial load
duke
parents:
diff changeset
   942
    if (new_cnt > 0) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   943
      Node *cex = sb->_nodes[1+new_cnt];
489c9b5090e2 Initial load
duke
parents:
diff changeset
   944
      if( cex->is_Mach() && cex->as_Mach()->ideal_Opcode() == Op_CreateEx ) {
489c9b5090e2 Initial load
duke
parents:
diff changeset
   945
        sb->_nodes.remove(1+new_cnt);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   946
        sb->_nodes.insert(1,cex);
489c9b5090e2 Initial load
duke
parents:
diff changeset
   947
      }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   948
    }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   949
  }
489c9b5090e2 Initial load
duke
parents:
diff changeset
   950
}