--- old/src/share/vm/opto/mathexactnode.cpp	2013-10-23 08:41:19.601854565 +0200
+++ new/src/share/vm/opto/mathexactnode.cpp	2013-10-23 08:41:19.497854569 +0200
@@ -31,10 +31,17 @@
 #include "opto/mathexactnode.hpp"
 #include "opto/subnode.hpp"
 
-MathExactNode::MathExactNode(Node* ctrl, Node* n1, Node* n2) : MultiNode(3) {
+MathExactNode::MathExactNode(Node* ctrl, Node* in1) : MultiNode(2) {
+  init_class_id(Class_MathExact);
   init_req(0, ctrl);
-  init_req(1, n1);
-  init_req(2, n2);
+  init_req(1, in1);
+}
+
+MathExactNode::MathExactNode(Node* ctrl, Node* in1, Node* in2) : MultiNode(3) {
+  init_class_id(Class_MathExact);
+  init_req(0, ctrl);
+  init_req(1, in1);
+  init_req(2, in2);
 }
 
 BoolNode* MathExactNode::bool_node() const {
@@ -64,23 +71,10 @@
   return ifnode->proj_out(1);
 }
 
-Node* AddExactINode::match(const ProjNode* proj, const Matcher* m) {
-  uint ideal_reg = proj->ideal_reg();
-  RegMask rm;
-  if (proj->_con == result_proj_node) {
-    rm = m->mathExactI_result_proj_mask();
-  } else {
-    assert(proj->_con == flags_proj_node, "must be result or flags");
-    assert(ideal_reg == Op_RegFlags, "sanity");
-    rm = m->mathExactI_flags_proj_mask();
-  }
-  return new (m->C) MachProjNode(this, proj->_con, rm, ideal_reg);
-}
-
 // If the MathExactNode won't overflow we have to replace the
 // FlagsProjNode and ProjNode that is generated by the MathExactNode
-Node* MathExactNode::no_overflow(PhaseGVN *phase, Node* new_result) {
-  PhaseIterGVN *igvn = phase->is_IterGVN();
+Node* MathExactNode::no_overflow(PhaseGVN* phase, Node* new_result) {
+  PhaseIterGVN* igvn = phase->is_IterGVN();
   if (igvn) {
     ProjNode* result = result_node();
     ProjNode* flags = flags_node();
@@ -110,9 +104,35 @@
   return new_result;
 }
 
-Node *AddExactINode::Ideal(PhaseGVN *phase, bool can_reshape) {
-  Node *arg1 = in(1);
-  Node *arg2 = in(2);
+Node* MathExactINode::match(const ProjNode* proj, const Matcher* m) {
+  uint ideal_reg = proj->ideal_reg();
+  RegMask rm;
+  if (proj->_con == result_proj_node) {
+    rm = m->mathExactI_result_proj_mask();
+  } else {
+    assert(proj->_con == flags_proj_node, "must be result or flags");
+    assert(ideal_reg == Op_RegFlags, "sanity");
+    rm = m->mathExactI_flags_proj_mask();
+  }
+  return new (m->C) MachProjNode(this, proj->_con, rm, ideal_reg);
+}
+
+Node* MathExactLNode::match(const ProjNode* proj, const Matcher* m) {
+  uint ideal_reg = proj->ideal_reg();
+  RegMask rm;
+  if (proj->_con == result_proj_node) {
+    rm = m->mathExactL_result_proj_mask();
+  } else {
+    assert(proj->_con == flags_proj_node, "must be result or flags");
+    assert(ideal_reg == Op_RegFlags, "sanity");
+    rm = m->mathExactI_flags_proj_mask();
+  }
+  return new (m->C) MachProjNode(this, proj->_con, rm, ideal_reg);
+}
+
+Node* AddExactINode::Ideal(PhaseGVN* phase, bool can_reshape) {
+  Node* arg1 = in(1);
+  Node* arg2 = in(2);
 
   const Type* type1 = phase->type(arg1);
   const Type* type2 = phase->type(arg2);
@@ -130,13 +150,62 @@
     return NULL;
   }
 
-  if (type1 == TypeInt::ZERO) { // (Add 0 x) == x
+  if (type1 == TypeInt::ZERO || type2 == TypeInt::ZERO) { // (Add 0 x) == x
     Node* add_result = new (phase->C) AddINode(arg1, arg2);
     return no_overflow(phase, add_result);
   }
 
-  if (type2 == TypeInt::ZERO) { // (Add x 0) == x
-    Node* add_result = new (phase->C) AddINode(arg1, arg2);
+  if (type2->singleton()) {
+    return NULL; // no change - keep constant on the right
+  }
+
+  if (type1->singleton()) {
+    // Make it x + Constant - move constant to the right
+    swap_edges(1, 2);
+    return this;
+  }
+
+  if (arg2->is_Load()) {
+    return NULL; // no change - keep load on the right
+  }
+
+  if (arg1->is_Load()) {
+    // Make it x + Load - move load to the right
+    swap_edges(1, 2);
+    return this;
+  }
+
+  if (arg1->_idx > arg2->_idx) {
+    // Sort the edges
+    swap_edges(1, 2);
+    return this;
+  }
+
+  return NULL;
+}
+
+Node* AddExactLNode::Ideal(PhaseGVN* phase, bool can_reshape) {
+  Node* arg1 = in(1);
+  Node* arg2 = in(2);
+
+  const Type* type1 = phase->type(arg1);
+  const Type* type2 = phase->type(arg2);
+
+  if (type1 != Type::TOP && type1->singleton() &&
+      type2 != Type::TOP && type2->singleton()) {
+    jlong val1 = arg1->get_long();
+    jlong val2 = arg2->get_long();
+    jlong result = val1 + val2;
+    // Hacker's Delight 2-12 Overflow if both arguments have the opposite sign of the result
+    if ( (((val1 ^ result) & (val2 ^ result)) >= 0)) {
+      Node* con_result = ConLNode::make(phase->C, result);
+      return no_overflow(phase, con_result);
+    }
+    return NULL;
+  }
+
+  if (type1 == TypeLong::ZERO || type2 == TypeLong::ZERO) { // (Add 0 x) == x
+    Node* add_result = new (phase->C) AddLNode(arg1, arg2);
     return no_overflow(phase, add_result);
   }
 
@@ -167,5 +236,195 @@
   }
 
   return NULL;
+}
+
+Node* SubExactINode::Ideal(PhaseGVN* phase, bool can_reshape) {
+  Node* arg1 = in(1);
+  Node* arg2 = in(2);
+
+  const Type* type1 = phase->type(arg1);
+  const Type* type2 = phase->type(arg2);
+
+  if (type1 != Type::TOP && type1->singleton() &&
+      type2 != Type::TOP && type2->singleton()) {
+    jint val1 = arg1->get_int();
+    jint val2 = arg2->get_int();
+    jint result = val1 - val2;
+
+    // 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 (((val1 ^ val2) & (val1 ^ result)) >= 0) {
+      Node* con_result = ConINode::make(phase->C, result);
+      return no_overflow(phase, con_result);
+    }
+    return NULL;
+  }
+
+  if (type1 == TypeInt::ZERO || type2 == TypeInt::ZERO) {
+    // Sub with zero is the same as add with zero
+    Node* add_result = new (phase->C) AddINode(arg1, arg2);
+    return no_overflow(phase, add_result);
+  }
+
+  return NULL;
+}
+
+Node* SubExactLNode::Ideal(PhaseGVN* phase, bool can_reshape) {
+  Node* arg1 = in(1);
+  Node* arg2 = in(2);
+
+  const Type* type1 = phase->type(arg1);
+  const Type* type2 = phase->type(arg2);
+
+  if (type1 != Type::TOP && type1->singleton() &&
+      type2 != Type::TOP && type2->singleton()) {
+    jlong val1 = arg1->get_long();
+    jlong val2 = arg2->get_long();
+    jlong result = val1 - val2;
+
+    // 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 (((val1 ^ val2) & (val1 ^ result)) >= 0) {
+      Node* con_result = ConLNode::make(phase->C, result);
+      return no_overflow(phase, con_result);
+    }
+    return NULL;
+  }
+
+  if (type1 == TypeLong::ZERO || type2 == TypeLong::ZERO) {
+    // Sub with zero is the same as add with zero
+    Node* add_result = new (phase->C) AddLNode(arg1, arg2);
+    return no_overflow(phase, add_result);
+  }
+
+  return NULL;
+}
+
+Node* NegExactINode::Ideal(PhaseGVN* phase, bool can_reshape) {
+  Node *arg = in(1);
+
+  const Type* type = phase->type(arg);
+  if (type != Type::TOP && type->singleton()) {
+    jint value = arg->get_int();
+    if (value != min_jint) {
+      Node* neg_result = ConINode::make(phase->C, -value);
+      return no_overflow(phase, neg_result);
+    }
+  }
+  return NULL;
+}
+
+Node* NegExactLNode::Ideal(PhaseGVN* phase, bool can_reshape) {
+  Node *arg = in(1);
+
+  const Type* type = phase->type(arg);
+  if (type != Type::TOP && type->singleton()) {
+    jlong value = arg->get_long();
+    if (value != min_jlong) {
+      Node* neg_result = ConLNode::make(phase->C, -value);
+      return no_overflow(phase, neg_result);
+    }
+  }
+  return NULL;
+}
+
+Node* MulExactINode::Ideal(PhaseGVN* phase, bool can_reshape) {
+  Node* arg1 = in(1);
+  Node* arg2 = in(2);
+
+  const Type* type1 = phase->type(arg1);
+  const Type* type2 = phase->type(arg2);
+
+  if (type1 != Type::TOP && type1->singleton() &&
+      type2 != Type::TOP && type2->singleton()) {
+    jint val1 = arg1->get_int();
+    jint val2 = arg2->get_int();
+    jlong result = (jlong) val1 * (jlong) val2;
+    if ((jint) result == result) {
+      // no overflow
+      Node* mul_result = ConINode::make(phase->C, result);
+      return no_overflow(phase, mul_result);
+    }
+  }
+
+  if (type1 == TypeInt::ZERO || type2 == TypeInt::ZERO) {
+    return no_overflow(phase, ConINode::make(phase->C, 0));
+  }
+
+  if (type1 == TypeInt::ONE) {
+    Node* mul_result = new (phase->C) AddINode(arg2, phase->intcon(0));
+    return no_overflow(phase, mul_result);
+  }
+  if (type2 == TypeInt::ONE) {
+    Node* mul_result = new (phase->C) AddINode(arg1, phase->intcon(0));
+    return no_overflow(phase, mul_result);
+  }
+
+  if (type1 == TypeInt::MINUS_1) {
+    return new (phase->C) NegExactINode(NULL, arg2);
+  }
+
+  if (type2 == TypeInt::MINUS_1) {
+    return new (phase->C) NegExactINode(NULL, arg1);
+  }
+
+  return NULL;
+}
+
+Node* MulExactLNode::Ideal(PhaseGVN* phase, bool can_reshape) {
+  Node* arg1 = in(1);
+  Node* arg2 = in(2);
+
+  const Type* type1 = phase->type(arg1);
+  const Type* type2 = phase->type(arg2);
+
+  if (type1 != Type::TOP && type1->singleton() &&
+      type2 != Type::TOP && type2->singleton()) {
+    jlong val1 = arg1->get_long();
+    jlong val2 = arg2->get_long();
+
+    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;
+      }
+    }
+
+    if (!overflow) {
+      Node* mul_result = ConLNode::make(phase->C, result);
+      return no_overflow(phase, mul_result);
+    }
+  }
+
+  if (type1 == TypeLong::ZERO || type2 == TypeLong::ZERO) {
+    return no_overflow(phase, ConLNode::make(phase->C, 0));
+  }
+
+  if (type1 == TypeLong::ONE) {
+    Node* mul_result = new (phase->C) AddLNode(arg2, phase->longcon(0));
+    return no_overflow(phase, mul_result);
+  }
+  if (type2 == TypeLong::ONE) {
+    Node* mul_result = new (phase->C) AddLNode(arg1, phase->longcon(0));
+    return no_overflow(phase, mul_result);
+  }
+
+  if (type1 == TypeLong::MINUS_1) {
+    return new (phase->C) NegExactLNode(NULL, arg2);
+  }
+
+  if (type2 == TypeLong::MINUS_1) {
+    return new (phase->C) NegExactLNode(NULL, arg1);
+  }
+
+  return NULL;
 }