1 /* 2 * Copyright (c) 1997, 2009, 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 // Portions of code courtesy of Clifford Click 26 27 #include "incls/_precompiled.incl" 28 #include "incls/_mulnode.cpp.incl" 29 30 31 //============================================================================= 32 //------------------------------hash------------------------------------------- 33 // Hash function over MulNodes. Needs to be commutative; i.e., I swap 34 // (commute) inputs to MulNodes willy-nilly so the hash function must return 35 // the same value in the presence of edge swapping. 36 uint MulNode::hash() const { 37 return (uintptr_t)in(1) + (uintptr_t)in(2) + Opcode(); 38 } 39 40 //------------------------------Identity--------------------------------------- 41 // Multiplying a one preserves the other argument 42 Node *MulNode::Identity( PhaseTransform *phase ) { 43 register const Type *one = mul_id(); // The multiplicative identity 44 if( phase->type( in(1) )->higher_equal( one ) ) return in(2); 45 if( phase->type( in(2) )->higher_equal( one ) ) return in(1); 46 47 return this; 48 } | 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 #include "precompiled.hpp" 26 #include "memory/allocation.inline.hpp" 27 #include "opto/addnode.hpp" 28 #include "opto/connode.hpp" 29 #include "opto/memnode.hpp" 30 #include "opto/mulnode.hpp" 31 #include "opto/phaseX.hpp" 32 #include "opto/subnode.hpp" 33 34 // Portions of code courtesy of Clifford Click 35 36 37 //============================================================================= 38 //------------------------------hash------------------------------------------- 39 // Hash function over MulNodes. Needs to be commutative; i.e., I swap 40 // (commute) inputs to MulNodes willy-nilly so the hash function must return 41 // the same value in the presence of edge swapping. 42 uint MulNode::hash() const { 43 return (uintptr_t)in(1) + (uintptr_t)in(2) + Opcode(); 44 } 45 46 //------------------------------Identity--------------------------------------- 47 // Multiplying a one preserves the other argument 48 Node *MulNode::Identity( PhaseTransform *phase ) { 49 register const Type *one = mul_id(); // The multiplicative identity 50 if( phase->type( in(1) )->higher_equal( one ) ) return in(2); 51 if( phase->type( in(2) )->higher_equal( one ) ) return in(1); 52 53 return this; 54 } |