Unbox phis that were proven to be of type Double.

runtime/vm/deopt_instructions.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_DEOPT_INSTRUCTIONS_H_
 #define VM_DEOPT_INSTRUCTIONS_H_
 
 #include "vm/allocation.h"
 #include "vm/assembler.h"
 #include "vm/growable_array.h"
@@ skipping 29 matching lines @@
   intptr_t* GetFromPcAddress() const;
 
   RawObject* ObjectAt(intptr_t index) const {
     return object_table_.At(index);
   }
 
   intptr_t RegisterValue(Register reg) const {
     return registers_copy_[reg];
   }
 
+  double XmmRegisterValue(XmmRegister reg) const {
+    return xmm_registers_copy_[reg];
+  }
+
   Isolate* isolate() const { return isolate_; }
 
   intptr_t from_frame_size() const { return from_frame_size_; }
 
  private:
   const Array& object_table_;
   intptr_t* to_frame_;
   const intptr_t to_frame_size_;
   intptr_t* from_frame_;
   intptr_t from_frame_size_;
   intptr_t* registers_copy_;
+  double* xmm_registers_copy_;
   const intptr_t num_args_;
   Isolate* isolate_;
 
   DISALLOW_COPY_AND_ASSIGN(DeoptimizationContext);
 };
 
 
 
 // Represents one deopt instruction, e.g, setup return address, store object,
 // store register, etc. The target is defined by instruction's position in
 // the deopt-info array.
 class DeoptInstr : public ZoneAllocated {
  public:
   static DeoptInstr* Create(intptr_t kind_as_int, intptr_t from_index);
 
   DeoptInstr() {}
   virtual ~DeoptInstr() {}
 
   virtual const char* ToCString() const = 0;
 
   virtual void Execute(DeoptimizationContext* deopt_context,
                        intptr_t to_index) = 0;
 
  protected:
   enum Kind {
     kSetRetAddress,
     kCopyConstant,
     kCopyRegister,
+    kCopyXmmRegister,
     kCopyStackSlot,
+    kCopyDoubleStackSlot,
     kSetPcMarker,
     kSetCallerFp,
     kSetCallerPc,
   };
 
   virtual DeoptInstr::Kind kind() const = 0;
   virtual intptr_t from_index() const = 0;
 
   friend class DeoptInfoBuilder;
 
@@ skipping 36 matching lines @@
   GrowableArray<DeoptInstr*> instructions_;
   const GrowableObjectArray& object_table_;
   const intptr_t num_args_;
 
   DISALLOW_COPY_AND_ASSIGN(DeoptInfoBuilder);
 };
 
 }  // namespace dart
 
 #endif  // VM_DEOPT_INSTRUCTIONS_H_