jdk8-mips64-public/hotspot: comparison src/share/vm/opto/mathexactnode.cpp

--1:000000000000
+:f90c822e73f8
+/*
+* 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 / file comparison

comparison: src/share/vm/opto/mathexactnode.cpp

src/share/vm/opto/mathexactnode.cpp