jdk8-mips64-public/hotspot: src/share/vm/opto/mathexactnode.cpp@c9ccd7b85f20 (annotated)

src/share/vm/opto/mathexactnode.cpp@c9ccd7b85f20 (annotated)

src/share/vm/opto/mathexactnode.cpp

Fri, 27 Sep 2013 08:39:19 +0200

author: rbackman
date: Fri, 27 Sep 2013 08:39:19 +0200
changeset 5791: c9ccd7b85f20
child 5927: 4a2acfb16e97
permissions: -rw-r--r--

8024924: Intrinsify java.lang.Math.addExact
Reviewed-by: kvn, twisti

 /*
  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "memory/allocation.inline.hpp"
 #include "opto/addnode.hpp"
 #include "opto/machnode.hpp"
 #include "opto/mathexactnode.hpp"
 #include "opto/matcher.hpp"
 #include "opto/subnode.hpp"
 MathExactNode::MathExactNode(Node* ctrl, Node* n1, Node* n2) : MultiNode(3) {
   init_req(0, ctrl);
   init_req(1, n1);
   init_req(2, n2);
 }
 Node* AddExactINode::match(const ProjNode* proj, const Matcher* m) {
   uint ideal_reg = proj->ideal_reg();
   RegMask rm;
   if (proj->_con == result_proj_node) {
     rm = m->mathExactI_result_proj_mask();
   } else {
     assert(proj->_con == flags_proj_node, "must be result or flags");
     assert(ideal_reg == Op_RegFlags, "sanity");
     rm = m->mathExactI_flags_proj_mask();
   }
   return new (m->C) MachProjNode(this, proj->_con, rm, ideal_reg);
 }
 // If the MathExactNode won't overflow we have to replace the
 // FlagsProjNode and ProjNode that is generated by the MathExactNode
 Node* MathExactNode::no_overflow(PhaseGVN *phase, Node* new_result) {
   PhaseIterGVN *igvn = phase->is_IterGVN();
   if (igvn) {
     ProjNode* result = result_node();
     ProjNode* flags = flags_node();
     if (result != NULL) {
       igvn->replace_node(result, new_result);
     }
     if (flags != NULL) {
       BoolNode* bolnode = (BoolNode *) flags->unique_out();
       switch (bolnode->_test._test) {
         case BoolTest::overflow:
           // if the check is for overflow - never taken
           igvn->replace_node(bolnode, phase->intcon(0));
           break;
         case BoolTest::no_overflow:
           // if the check is for no overflow - always taken
           igvn->replace_node(bolnode, phase->intcon(1));
           break;
         default:
           fatal("Unexpected value of BoolTest");
           break;
       }
       flags->del_req(0);
     }
   }
   return new_result;
 }
 Node *AddExactINode::Ideal(PhaseGVN *phase, bool can_reshape) {
   Node *arg1 = in(1);
   Node *arg2 = in(2);
   const Type* type1 = phase->type(arg1);
   const Type* type2 = phase->type(arg2);
   if (type1 != Type::TOP && type1->singleton() &&
       type2 != Type::TOP && type2->singleton()) {
     jint val1 = arg1->get_int();
     jint val2 = arg2->get_int();
     jint result = val1 + val2;
     // Hacker's Delight 2-12 Overflow if both arguments have the opposite sign of the result
     if ( (((val1 ^ result) & (val2 ^ result)) >= 0)) {
       Node* con_result = ConINode::make(phase->C, result);
       return no_overflow(phase, con_result);
     }
     return NULL;
   }
   if (type1 == TypeInt::ZERO) { // (Add 0 x) == x
     Node* add_result = new (phase->C) AddINode(arg1, arg2);
     return no_overflow(phase, add_result);
   }
   if (type2 == TypeInt::ZERO) { // (Add x 0) == x
     Node* add_result = new (phase->C) AddINode(arg1, arg2);
     return no_overflow(phase, add_result);
   }
   if (type2->singleton()) {
     return NULL; // no change - keep constant on the right
   }
   if (type1->singleton()) {
     // Make it x + Constant - move constant to the right
     swap_edges(1, 2);
     return this;
   }
   if (arg2->is_Load()) {
     return NULL; // no change - keep load on the right
   }
   if (arg1->is_Load()) {
     // Make it x + Load - move load to the right
     swap_edges(1, 2);
     return this;
   }
   if (arg1->_idx > arg2->_idx) {
     // Sort the edges
     swap_edges(1, 2);
     return this;
   }
   return NULL;
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/opto/mathexactnode.cpp@c9ccd7b85f20 (annotated)

src/share/vm/opto/mathexactnode.cpp