JDK14/Java14源码在线阅读

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 *
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 * 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.
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#ifndef SHARE_OPTO_DIVNODE_HPP
#define SHARE_OPTO_DIVNODE_HPP

#include "opto/multnode.hpp"
#include "opto/node.hpp"
#include "opto/opcodes.hpp"
#include "opto/type.hpp"

// Portions of code courtesy of Clifford Click

// Optimization - Graph Style


//------------------------------DivINode---------------------------------------
// Integer division
// Note: this is division as defined by JVMS, i.e., MinInt/-1 == MinInt.
// On processors which don't naturally support this special case (e.g., x86),
// the matcher or runtime system must take care of this.
class DivINode : public Node {
public:
  DivINode( Node *c, Node *dividend, Node *divisor ) : Node(c, dividend, divisor ) {}
  virtual int Opcode() const;
  virtual Node* Identity(PhaseGVN* phase);
  virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
  virtual const Type* Value(PhaseGVN* phase) const;
  virtual const Type *bottom_type() const { return TypeInt::INT; }
  virtual uint ideal_reg() const { return Op_RegI; }
};

//------------------------------DivLNode---------------------------------------
// Long division
class DivLNode : public Node {
public:
  DivLNode( Node *c, Node *dividend, Node *divisor ) : Node(c, dividend, divisor ) {}
  virtual int Opcode() const;
  virtual Node* Identity(PhaseGVN* phase);
  virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
  virtual const Type* Value(PhaseGVN* phase) const;
  virtual const Type *bottom_type() const { return TypeLong::LONG; }
  virtual uint ideal_reg() const { return Op_RegL; }
};

//------------------------------DivFNode---------------------------------------
// Float division
class DivFNode : public Node {
public:
  DivFNode( Node *c, Node *dividend, Node *divisor ) : Node(c, dividend, divisor) {}
  virtual int Opcode() const;
  virtual Node* Identity(PhaseGVN* phase);
  virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
  virtual const Type* Value(PhaseGVN* phase) const;
  virtual const Type *bottom_type() const { return Type::FLOAT; }
  virtual uint ideal_reg() const { return Op_RegF; }
};

//------------------------------DivDNode---------------------------------------
// Double division
class DivDNode : public Node {
public:
  DivDNode( Node *c, Node *dividend, Node *divisor ) : Node(c,dividend, divisor) {}
  virtual int Opcode() const;
  virtual Node* Identity(PhaseGVN* phase);
  virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
  virtual const Type* Value(PhaseGVN* phase) const;
  virtual const Type *bottom_type() const { return Type::DOUBLE; }
  virtual uint ideal_reg() const { return Op_RegD; }
};

//------------------------------ModINode---------------------------------------
// Integer modulus
class ModINode : public Node {
public:
  ModINode( Node *c, Node *in1, Node *in2 ) : Node(c,in1, in2) {}
  virtual int Opcode() const;
  virtual const Type* Value(PhaseGVN* phase) const;
  virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
  virtual const Type *bottom_type() const { return TypeInt::INT; }
  virtual uint ideal_reg() const { return Op_RegI; }
};

//------------------------------ModLNode---------------------------------------
// Long modulus
class ModLNode : public Node {
public:
  ModLNode( Node *c, Node *in1, Node *in2 ) : Node(c,in1, in2) {}
  virtual int Opcode() const;
  virtual const Type* Value(PhaseGVN* phase) const;
  virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
  virtual const Type *bottom_type() const { return TypeLong::LONG; }
  virtual uint ideal_reg() const { return Op_RegL; }
};

//------------------------------ModFNode---------------------------------------
// Float Modulus
class ModFNode : public Node {
public:
  ModFNode( Node *c, Node *in1, Node *in2 ) : Node(c,in1, in2) {}
  virtual int Opcode() const;
  virtual const Type* Value(PhaseGVN* phase) const;
  virtual const Type *bottom_type() const { return Type::FLOAT; }
  virtual uint ideal_reg() const { return Op_RegF; }
};

//------------------------------ModDNode---------------------------------------
// Double Modulus
class ModDNode : public Node {
public:
  ModDNode( Node *c, Node *in1, Node *in2 ) : Node(c, in1, in2) {}
  virtual int Opcode() const;
  virtual const Type* Value(PhaseGVN* phase) const;
  virtual const Type *bottom_type() const { return Type::DOUBLE; }
  virtual uint ideal_reg() const { return Op_RegD; }
};

//------------------------------DivModNode---------------------------------------
// Division with remainder result.
class DivModNode : public MultiNode {
protected:
  DivModNode( Node *c, Node *dividend, Node *divisor );
public:
  enum {
    div_proj_num =  0,      // quotient
    mod_proj_num =  1       // remainder
  };
  virtual int Opcode() const;
  virtual Node* Identity(PhaseGVN* phase) { return this; }
  virtual Node *Ideal(PhaseGVN *phase, bool can_reshape) { return NULL; }
  virtual const Type* Value(PhaseGVN* phase)  const { return bottom_type(); }
  virtual uint hash() const { return Node::hash(); }
  virtual bool is_CFG() const  { return false; }
  virtual uint ideal_reg() const { return NotAMachineReg; }

  ProjNode* div_proj() { return proj_out_or_null(div_proj_num); }
  ProjNode* mod_proj() { return proj_out_or_null(mod_proj_num); }
};

//------------------------------DivModINode---------------------------------------
// Integer division with remainder result.
class DivModINode : public DivModNode {
public:
  DivModINode( Node *c, Node *dividend, Node *divisor ) : DivModNode(c, dividend, divisor) {}
  virtual int Opcode() const;
  virtual const Type *bottom_type() const { return TypeTuple::INT_PAIR; }

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