1 /*
   2  * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_VM_OPTO_MATHEXACTNODE_HPP
  26 #define SHARE_VM_OPTO_MATHEXACTNODE_HPP
  27 
  28 #include "opto/multnode.hpp"
  29 #include "opto/node.hpp"
  30 #include "opto/subnode.hpp"
  31 #include "opto/type.hpp"
  32 
  33 class BoolNode;
  34 class IfNode;
  35 class Node;
  36 
  37 class PhaseGVN;
  38 class PhaseTransform;
  39 
  40 class MathExactNode : public MultiNode {
  41 public:
  42   MathExactNode(Node* ctrl, Node* in1, Node* in2);
  43   enum {
  44     result_proj_node = 0,
  45     flags_proj_node = 1
  46   };
  47   virtual int Opcode() const;
  48   virtual Node* Identity(PhaseTransform* phase) { return this; }
  49   virtual Node* Ideal(PhaseGVN* phase, bool can_reshape) { return NULL; }
  50   virtual const Type* Value(PhaseTransform* phase) const { return bottom_type(); }
  51   virtual uint hash() const { return Node::hash(); }
  52   virtual bool is_CFG() const { return false; }
  53   virtual uint ideal_reg() const { return NotAMachineReg; }
  54 
  55   ProjNode* result_node() const { return proj_out(result_proj_node); }
  56   ProjNode* flags_node() const { return proj_out(flags_proj_node); }
  57   Node* control_node() const;
  58   Node* non_throwing_branch() const;
  59 protected:
  60   IfNode* if_node() const;
  61   BoolNode* bool_node() const;
  62   Node* no_overflow(PhaseGVN *phase, Node* new_result);
  63 };
  64 
  65 class AddExactINode : public MathExactNode {
  66 public:
  67   AddExactINode(Node* ctrl, Node* in1, Node* in2) : MathExactNode(ctrl, in1, in2) {}
  68   virtual int Opcode() const;
  69   virtual const Type* bottom_type() const { return TypeTuple::INT_CC_PAIR; }
  70   virtual Node* match(const ProjNode* proj, const Matcher* m);
  71   virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
  72 };
  73 
  74 class FlagsProjNode : public ProjNode {
  75 public:
  76   FlagsProjNode(Node* src, uint con) : ProjNode(src, con) {
  77     init_class_id(Class_FlagsProj);
  78   }
  79 
  80   virtual int Opcode() const;
  81   virtual bool is_CFG() const { return false; }
  82   virtual const Type* bottom_type() const { return TypeInt::CC; }
  83   virtual uint ideal_reg() const { return Op_RegFlags; }
  84 };
  85 
  86 
  87 #endif
  88