jdk8-mips64-public/hotspot: src/share/vm/opto/mathexactnode.cpp@f90c822e73f8 (annotated)

src/share/vm/opto/mathexactnode.cpp@f90c822e73f8 (annotated)

src/share/vm/opto/mathexactnode.cpp

Wed, 27 Apr 2016 01:25:04 +0800

author: aoqi
date: Wed, 27 Apr 2016 01:25:04 +0800
changeset 0: f90c822e73f8
child 6876: 710a3c8b516e
permissions: -rw-r--r--

Initial load
http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/
changeset: 6782:28b50d07f6f8
tag: jdk8u25-b17

 /*
  * 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/cfgnode.hpp"
 #include "opto/machnode.hpp"
 #include "opto/matcher.hpp"
 #include "opto/mathexactnode.hpp"
 #include "opto/subnode.hpp"
 template <typename OverflowOp>
 class AddHelper {
 public:
   typedef typename OverflowOp::TypeClass TypeClass;
   typedef typename TypeClass::NativeType NativeType;
   static bool will_overflow(NativeType value1, NativeType value2) {
     NativeType result = value1 + value2;
     // Hacker's Delight 2-12 Overflow if both arguments have the opposite sign of the result
     if (((value1 ^ result) & (value2 ^ result)) >= 0) {
       return false;
     }
     return true;
   }
   static bool can_overflow(const Type* type1, const Type* type2) {
     if (type1 == TypeClass::ZERO || type2 == TypeClass::ZERO) {
       return false;
     }
     return true;
   }
 };
 template <typename OverflowOp>
 class SubHelper {
 public:
   typedef typename OverflowOp::TypeClass TypeClass;
   typedef typename TypeClass::NativeType NativeType;
   static bool will_overflow(NativeType value1, NativeType value2) {
     NativeType result = value1 - value2;
     // hacker's delight 2-12 overflow iff the arguments have different signs and
     // the sign of the result is different than the sign of arg1
     if (((value1 ^ value2) & (value1 ^ result)) >= 0) {
       return false;
     }
     return true;
   }
   static bool can_overflow(const Type* type1, const Type* type2) {
     if (type2 == TypeClass::ZERO) {
       return false;
     }
     return true;
   }
 };
 template <typename OverflowOp>
 class MulHelper {
 public:
   typedef typename OverflowOp::TypeClass TypeClass;
   static bool can_overflow(const Type* type1, const Type* type2) {
     if (type1 == TypeClass::ZERO || type2 == TypeClass::ZERO) {
       return false;
     } else if (type1 == TypeClass::ONE || type2 == TypeClass::ONE) {
       return false;
     }
     return true;
   }
 };
 bool OverflowAddINode::will_overflow(jint v1, jint v2) const {
   return AddHelper<OverflowAddINode>::will_overflow(v1, v2);
 }
 bool OverflowSubINode::will_overflow(jint v1, jint v2) const {
   return SubHelper<OverflowSubINode>::will_overflow(v1, v2);
 }
 bool OverflowMulINode::will_overflow(jint v1, jint v2) const {
     jlong result = (jlong) v1 * (jlong) v2;
     if ((jint) result == result) {
       return false;
     }
     return true;
 }
 bool OverflowAddLNode::will_overflow(jlong v1, jlong v2) const {
   return AddHelper<OverflowAddLNode>::will_overflow(v1, v2);
 }
 bool OverflowSubLNode::will_overflow(jlong v1, jlong v2) const {
   return SubHelper<OverflowSubLNode>::will_overflow(v1, v2);
 }
 bool OverflowMulLNode::will_overflow(jlong val1, jlong val2) const {
     jlong result = val1 * val2;
     jlong ax = (val1 < 0 ? -val1 : val1);
     jlong ay = (val2 < 0 ? -val2 : val2);
     bool overflow = false;
     if ((ax | ay) & CONST64(0xFFFFFFFF00000000)) {
       // potential overflow if any bit in upper 32 bits are set
       if ((val1 == min_jlong && val2 == -1) || (val2 == min_jlong && val1 == -1)) {
         // -1 * Long.MIN_VALUE will overflow
         overflow = true;
       } else if (val2 != 0 && (result / val2 != val1)) {
         overflow = true;
       }
     }
     return overflow;
 }
 bool OverflowAddINode::can_overflow(const Type* t1, const Type* t2) const {
   return AddHelper<OverflowAddINode>::can_overflow(t1, t2);
 }
 bool OverflowSubINode::can_overflow(const Type* t1, const Type* t2) const {
   if (in(1) == in(2)) {
     return false;
   }
   return SubHelper<OverflowSubINode>::can_overflow(t1, t2);
 }
 bool OverflowMulINode::can_overflow(const Type* t1, const Type* t2) const {
   return MulHelper<OverflowMulINode>::can_overflow(t1, t2);
 }
 bool OverflowAddLNode::can_overflow(const Type* t1, const Type* t2) const {
   return AddHelper<OverflowAddLNode>::can_overflow(t1, t2);
 }
 bool OverflowSubLNode::can_overflow(const Type* t1, const Type* t2) const {
   if (in(1) == in(2)) {
     return false;
   }
   return SubHelper<OverflowSubLNode>::can_overflow(t1, t2);
 }
 bool OverflowMulLNode::can_overflow(const Type* t1, const Type* t2) const {
   return MulHelper<OverflowMulLNode>::can_overflow(t1, t2);
 }
 const Type* OverflowNode::sub(const Type* t1, const Type* t2) const {
   fatal(err_msg_res("sub() should not be called for '%s'", NodeClassNames[this->Opcode()]));
   return TypeInt::CC;
 }
 template <typename OverflowOp>
 struct IdealHelper {
   typedef typename OverflowOp::TypeClass TypeClass; // TypeInt, TypeLong
   typedef typename TypeClass::NativeType NativeType;
   static Node* Ideal(const OverflowOp* node, PhaseGVN* phase, bool can_reshape) {
     Node* arg1 = node->in(1);
     Node* arg2 = node->in(2);
     const Type* type1 = phase->type(arg1);
     const Type* type2 = phase->type(arg2);
     if (type1 == NULL || type2 == NULL) {
       return NULL;
     }
     if (type1 != Type::TOP && type1->singleton() &&
         type2 != Type::TOP && type2->singleton()) {
       NativeType val1 = TypeClass::as_self(type1)->get_con();
       NativeType val2 = TypeClass::as_self(type2)->get_con();
       if (node->will_overflow(val1, val2) == false) {
         Node* con_result = ConINode::make(phase->C, 0);
         return con_result;
       }
       return NULL;
     }
     return NULL;
   }
   static const Type* Value(const OverflowOp* node, PhaseTransform* phase) {
     const Type *t1 = phase->type( node->in(1) );
     const Type *t2 = phase->type( node->in(2) );
     if( t1 == Type::TOP ) return Type::TOP;
     if( t2 == Type::TOP ) return Type::TOP;
     const TypeClass* i1 = TypeClass::as_self(t1);
     const TypeClass* i2 = TypeClass::as_self(t2);
     if (i1 == NULL || i2 == NULL) {
       return TypeInt::CC;
     }
     if (t1->singleton() && t2->singleton()) {
       NativeType val1 = i1->get_con();
       NativeType val2 = i2->get_con();
       if (node->will_overflow(val1, val2)) {
         return TypeInt::CC;
       }
       return TypeInt::ZERO;
     } else if (i1 != TypeClass::TYPE_DOMAIN && i2 != TypeClass::TYPE_DOMAIN) {
       if (node->will_overflow(i1->_lo, i2->_lo)) {
         return TypeInt::CC;
       } else if (node->will_overflow(i1->_lo, i2->_hi)) {
         return TypeInt::CC;
       } else if (node->will_overflow(i1->_hi, i2->_lo)) {
         return TypeInt::CC;
       } else if (node->will_overflow(i1->_hi, i2->_hi)) {
         return TypeInt::CC;
       }
       return TypeInt::ZERO;
     }
     if (!node->can_overflow(t1, t2)) {
       return TypeInt::ZERO;
     }
     return TypeInt::CC;
   }
 };
 Node* OverflowINode::Ideal(PhaseGVN* phase, bool can_reshape) {
   return IdealHelper<OverflowINode>::Ideal(this, phase, can_reshape);
 }
 Node* OverflowLNode::Ideal(PhaseGVN* phase, bool can_reshape) {
   return IdealHelper<OverflowLNode>::Ideal(this, phase, can_reshape);
 }
 const Type* OverflowINode::Value(PhaseTransform* phase) const {
   return IdealHelper<OverflowINode>::Value(this, phase);
 }
 const Type* OverflowLNode::Value(PhaseTransform* phase) const {
   return IdealHelper<OverflowLNode>::Value(this, phase);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/opto/mathexactnode.cpp@f90c822e73f8 (annotated)

src/share/vm/opto/mathexactnode.cpp