Faster 64-bit right-shift for the ia32 compiler.

runtime/vm/intermediate_language.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 241 matching lines @@
   M(CheckSmi)                                                                  \
   M(Constant)                                                                  \
   M(CheckEitherNonSmi)                                                         \
   M(BinaryDoubleOp)                                                            \
   M(MathSqrt)                                                                  \
   M(UnboxDouble)                                                               \
   M(BoxDouble)                                                                 \
   M(UnboxInteger)                                                              \
   M(BoxInteger)                                                                \
   M(BinaryMintOp)                                                              \
+  M(ShiftMintOp)                                                               \
   M(UnaryMintOp)                                                               \
   M(CheckArrayBound)                                                           \
   M(Constraint)                                                                \
 
 
 #define FORWARD_DECLARATION(type) class type##Instr;
 FOR_EACH_INSTRUCTION(FORWARD_DECLARATION)
 #undef FORWARD_DECLARATION
 
 
@@ skipping 237 matching lines @@
   }
 
  private:
   friend class Definition;  // Needed for InsertBefore, InsertAfter.
 
   // Classes that set deopt_id_.
   friend class UnboxIntegerInstr;
   friend class UnboxDoubleInstr;
   friend class BinaryDoubleOpInstr;
   friend class BinaryMintOpInstr;
+  friend class ShiftMintOpInstr;
   friend class UnaryMintOpInstr;
   friend class MathSqrtInstr;
   friend class CheckClassInstr;
   friend class CheckSmiInstr;
   friend class CheckArrayBoundInstr;
   friend class CheckEitherNonSmiInstr;
   friend class LICM;
 
   intptr_t deopt_id_;
   intptr_t lifetime_position_;  // Position used by register allocator.
@@ skipping 3048 matching lines @@
 
   DECLARE_INSTRUCTION(BinaryMintOp)
 
  private:
   const Token::Kind op_kind_;
 
   DISALLOW_COPY_AND_ASSIGN(BinaryMintOpInstr);
 };
 
 
+class ShiftMintOpInstr : public TemplateDefinition<2> {
+ public:
+  ShiftMintOpInstr(Token::Kind op_kind,
+                   Value* left,
+                   Value* right,
+                   InstanceCallInstr* instance_call)
+      : op_kind_(op_kind) {
+    ASSERT(left != NULL);
+    ASSERT(right != NULL);
+    ASSERT(op_kind == Token::kSHR);
+    inputs_[0] = left;
+    inputs_[1] = right;
+    deopt_id_ = instance_call->deopt_id();
+  }
+
+  Value* left() const { return inputs_[0]; }
+  Value* right() const { return inputs_[1]; }
+
+  Token::Kind op_kind() const { return op_kind_; }
+
+  virtual void PrintOperandsTo(BufferFormatter* f) const;
+
+  virtual bool CanDeoptimize() const { return true; }
+
+  virtual bool HasSideEffect() const { return false; }
+
+  virtual bool AffectedBySideEffect() const { return false; }
+
+  virtual bool AttributesEqual(Instruction* other) const {
+    return op_kind() == other->AsShiftMintOp()->op_kind();
+  }
+
+  virtual intptr_t ResultCid() const;
+  virtual RawAbstractType* CompileType() const;
+
+  virtual Representation representation() const {
+    return kUnboxedMint;
+  }
+
+  virtual Representation RequiredInputRepresentation(intptr_t idx) const {
+    ASSERT((idx == 0) || (idx == 1));
+    return (idx == 0) ? kUnboxedMint : kTagged;
+  }
+
+  virtual intptr_t DeoptimizationTarget() const {
+    // Direct access since this instuction cannot deoptimize, and the deopt-id
+    // was inherited from another instuction that could deoptimize.
+    return deopt_id_;
+  }
+
+  DECLARE_INSTRUCTION(ShiftMintOp)
+
+ private:
+  const Token::Kind op_kind_;
+
+  DISALLOW_COPY_AND_ASSIGN(ShiftMintOpInstr);
+};
+
+
 class UnaryMintOpInstr : public TemplateDefinition<1> {
  public:
   UnaryMintOpInstr(Token::Kind op_kind,
                           Value* value,
                           InstanceCallInstr* instance_call)
       : op_kind_(op_kind) {
     ASSERT(value != NULL);
     ASSERT(op_kind == Token::kBIT_NOT);
     inputs_[0] = value;
     deopt_id_ = instance_call->deopt_id();
@@ skipping 526 matching lines @@
   ForwardInstructionIterator* current_iterator_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_