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comparison: src/share/vm/opto/addnode.hpp

src/share/vm/opto/addnode.hpp

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1 /*
2 * Copyright (c) 1997, 2010, 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_ADDNODE_HPP
26 #define SHARE_VM_OPTO_ADDNODE_HPP
27
28 #include "opto/node.hpp"
29 #include "opto/opcodes.hpp"
30 #include "opto/type.hpp"
31
32 // Portions of code courtesy of Clifford Click
33
34 class PhaseTransform;
35
36 //------------------------------AddNode----------------------------------------
37 // Classic Add functionality. This covers all the usual 'add' behaviors for
38 // an algebraic ring. Add-integer, add-float, add-double, and binary-or are
39 // all inherited from this class. The various identity values are supplied
40 // by virtual functions.
41 class AddNode : public Node {
42 virtual uint hash() const;
43 public:
44 AddNode( Node *in1, Node *in2 ) : Node(0,in1,in2) {
45 init_class_id(Class_Add);
46 }
47
48 // Handle algebraic identities here. If we have an identity, return the Node
49 // we are equivalent to. We look for "add of zero" as an identity.
50 virtual Node *Identity( PhaseTransform *phase );
51
52 // We also canonicalize the Node, moving constants to the right input,
53 // and flatten expressions (so that 1+x+2 becomes x+3).
54 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
55
56 // Compute a new Type for this node. Basically we just do the pre-check,
57 // then call the virtual add() to set the type.
58 virtual const Type *Value( PhaseTransform *phase ) const;
59
60 // Check if this addition involves the additive identity
61 virtual const Type *add_of_identity( const Type *t1, const Type *t2 ) const;
62
63 // Supplied function returns the sum of the inputs.
64 // This also type-checks the inputs for sanity. Guaranteed never to
65 // be passed a TOP or BOTTOM type, these are filtered out by a pre-check.
66 virtual const Type *add_ring( const Type *, const Type * ) const = 0;
67
68 // Supplied function to return the additive identity type
69 virtual const Type *add_id() const = 0;
70
71 };
72
73 //------------------------------AddINode---------------------------------------
74 // Add 2 integers
75 class AddINode : public AddNode {
76 public:
77 AddINode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}
78 virtual int Opcode() const;
79 virtual const Type *add_ring( const Type *, const Type * ) const;
80 virtual const Type *add_id() const { return TypeInt::ZERO; }
81 virtual const Type *bottom_type() const { return TypeInt::INT; }
82 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
83 virtual Node *Identity( PhaseTransform *phase );
84 virtual uint ideal_reg() const { return Op_RegI; }
85 };
86
87 //------------------------------AddLNode---------------------------------------
88 // Add 2 longs
89 class AddLNode : public AddNode {
90 public:
91 AddLNode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}
92 virtual int Opcode() const;
93 virtual const Type *add_ring( const Type *, const Type * ) const;
94 virtual const Type *add_id() const { return TypeLong::ZERO; }
95 virtual const Type *bottom_type() const { return TypeLong::LONG; }
96 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
97 virtual Node *Identity( PhaseTransform *phase );
98 virtual uint ideal_reg() const { return Op_RegL; }
99 };
100
101 //------------------------------AddFNode---------------------------------------
102 // Add 2 floats
103 class AddFNode : public AddNode {
104 public:
105 AddFNode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}
106 virtual int Opcode() const;
107 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
108 virtual const Type *add_of_identity( const Type *t1, const Type *t2 ) const;
109 virtual const Type *add_ring( const Type *, const Type * ) const;
110 virtual const Type *add_id() const { return TypeF::ZERO; }
111 virtual const Type *bottom_type() const { return Type::FLOAT; }
112 virtual Node *Identity( PhaseTransform *phase ) { return this; }
113 virtual uint ideal_reg() const { return Op_RegF; }
114 };
115
116 //------------------------------AddDNode---------------------------------------
117 // Add 2 doubles
118 class AddDNode : public AddNode {
119 public:
120 AddDNode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}
121 virtual int Opcode() const;
122 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
123 virtual const Type *add_of_identity( const Type *t1, const Type *t2 ) const;
124 virtual const Type *add_ring( const Type *, const Type * ) const;
125 virtual const Type *add_id() const { return TypeD::ZERO; }
126 virtual const Type *bottom_type() const { return Type::DOUBLE; }
127 virtual Node *Identity( PhaseTransform *phase ) { return this; }
128 virtual uint ideal_reg() const { return Op_RegD; }
129 };
130
131 //------------------------------AddPNode---------------------------------------
132 // Add pointer plus integer to get pointer. NOT commutative, really.
133 // So not really an AddNode. Lives here, because people associate it with
134 // an add.
135 class AddPNode : public Node {
136 public:
137 enum { Control, // When is it safe to do this add?
138 Base, // Base oop, for GC purposes
139 Address, // Actually address, derived from base
140 Offset } ; // Offset added to address
141 AddPNode( Node *base, Node *ptr, Node *off ) : Node(0,base,ptr,off) {
142 init_class_id(Class_AddP);
143 }
144 virtual int Opcode() const;
145 virtual Node *Identity( PhaseTransform *phase );
146 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
147 virtual const Type *Value( PhaseTransform *phase ) const;
148 virtual const Type *bottom_type() const;
149 virtual uint ideal_reg() const { return Op_RegP; }
150 Node *base_node() { assert( req() > Base, "Missing base"); return in(Base); }
151 static Node* Ideal_base_and_offset(Node* ptr, PhaseTransform* phase,
152 // second return value:
153 intptr_t& offset);
154
155 // Collect the AddP offset values into the elements array, giving up
156 // if there are more than length.
157 int unpack_offsets(Node* elements[], int length);
158
159 // Do not match base-ptr edge
160 virtual uint match_edge(uint idx) const;
161 };
162
163 //------------------------------OrINode----------------------------------------
164 // Logically OR 2 integers. Included with the ADD nodes because it inherits
165 // all the behavior of addition on a ring.
166 class OrINode : public AddNode {
167 public:
168 OrINode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}
169 virtual int Opcode() const;
170 virtual const Type *add_ring( const Type *, const Type * ) const;
171 virtual const Type *add_id() const { return TypeInt::ZERO; }
172 virtual const Type *bottom_type() const { return TypeInt::INT; }
173 virtual Node *Identity( PhaseTransform *phase );
174 virtual uint ideal_reg() const { return Op_RegI; }
175 };
176
177 //------------------------------OrLNode----------------------------------------
178 // Logically OR 2 longs. Included with the ADD nodes because it inherits
179 // all the behavior of addition on a ring.
180 class OrLNode : public AddNode {
181 public:
182 OrLNode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}
183 virtual int Opcode() const;
184 virtual const Type *add_ring( const Type *, const Type * ) const;
185 virtual const Type *add_id() const { return TypeLong::ZERO; }
186 virtual const Type *bottom_type() const { return TypeLong::LONG; }
187 virtual Node *Identity( PhaseTransform *phase );
188 virtual uint ideal_reg() const { return Op_RegL; }
189 };
190
191 //------------------------------XorINode---------------------------------------
192 // XOR'ing 2 integers
193 class XorINode : public AddNode {
194 public:
195 XorINode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}
196 virtual int Opcode() const;
197 virtual const Type *add_ring( const Type *, const Type * ) const;
198 virtual const Type *add_id() const { return TypeInt::ZERO; }
199 virtual const Type *bottom_type() const { return TypeInt::INT; }
200 virtual uint ideal_reg() const { return Op_RegI; }
201 };
202
203 //------------------------------XorINode---------------------------------------
204 // XOR'ing 2 longs
205 class XorLNode : public AddNode {
206 public:
207 XorLNode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}
208 virtual int Opcode() const;
209 virtual const Type *add_ring( const Type *, const Type * ) const;
210 virtual const Type *add_id() const { return TypeLong::ZERO; }
211 virtual const Type *bottom_type() const { return TypeLong::LONG; }
212 virtual uint ideal_reg() const { return Op_RegL; }
213 };
214
215 //------------------------------MaxNode----------------------------------------
216 // Max (or min) of 2 values. Included with the ADD nodes because it inherits
217 // all the behavior of addition on a ring. Only new thing is that we allow
218 // 2 equal inputs to be equal.
219 class MaxNode : public AddNode {
220 public:
221 MaxNode( Node *in1, Node *in2 ) : AddNode(in1,in2) {}
222 virtual int Opcode() const = 0;
223 };
224
225 //------------------------------MaxINode---------------------------------------
226 // Maximum of 2 integers. Included with the ADD nodes because it inherits
227 // all the behavior of addition on a ring.
228 class MaxINode : public MaxNode {
229 public:
230 MaxINode( Node *in1, Node *in2 ) : MaxNode(in1,in2) {}
231 virtual int Opcode() const;
232 virtual const Type *add_ring( const Type *, const Type * ) const;
233 virtual const Type *add_id() const { return TypeInt::make(min_jint); }
234 virtual const Type *bottom_type() const { return TypeInt::INT; }
235 virtual uint ideal_reg() const { return Op_RegI; }
236 };
237
238 //------------------------------MinINode---------------------------------------
239 // MINimum of 2 integers. Included with the ADD nodes because it inherits
240 // all the behavior of addition on a ring.
241 class MinINode : public MaxNode {
242 public:
243 MinINode( Node *in1, Node *in2 ) : MaxNode(in1,in2) {}
244 virtual int Opcode() const;
245 virtual const Type *add_ring( const Type *, const Type * ) const;
246 virtual const Type *add_id() const { return TypeInt::make(max_jint); }
247 virtual const Type *bottom_type() const { return TypeInt::INT; }
248 virtual uint ideal_reg() const { return Op_RegI; }
249 virtual Node *Ideal(PhaseGVN *phase, bool can_reshape);
250 };
251
252 #endif // SHARE_VM_OPTO_ADDNODE_HPP

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