Refactor unboxed fields in preparation of reusable SIMD boxes

runtime/vm/intermediate_language.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/intermediate_language.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/bit_vector.h"
 #include "vm/dart_entry.h"
 #include "vm/flow_graph_allocator.h"
@@ skipping 133 matching lines @@
 }
 
 
 bool LoadFieldInstr::IsPotentialUnboxedLoad() const {
   return FLAG_unbox_double_fields
       && (field() != NULL)
       && field()->IsPotentialUnboxedField();
 }
 
 
+Representation LoadFieldInstr::representation() const {
+  if (IsUnboxedLoad()) {
+    const intptr_t cid = field()->UnboxedFieldCid();
+    switch (cid) {
+      case kDoubleCid:
+        return kUnboxedDouble;
+      // TODO(johnmccutchan): Add kFloat32x4Cid here.
+      default:
+        UNREACHABLE();
+    }
+  }
+  return kTagged;
+}
+
+
 bool StoreInstanceFieldInstr::IsUnboxedStore() const {
   return FLAG_unbox_double_fields && field().IsUnboxedField();
 }
 
 
 bool StoreInstanceFieldInstr::IsPotentialUnboxedStore() const {
   return FLAG_unbox_double_fields && field().IsPotentialUnboxedField();
 }
 
 
+Representation StoreInstanceFieldInstr::RequiredInputRepresentation(
+  intptr_t index) const {
+  ASSERT((index == 0) || (index == 1));
+  if ((index == 1) && IsUnboxedStore()) {
+    const intptr_t cid = field().UnboxedFieldCid();
+    switch (cid) {
+      case kDoubleCid:
+        return kUnboxedDouble;
+      default:
+        UNREACHABLE();
+    }
+  }
+  return kTagged;
+}
+
+
 bool GuardFieldInstr::AttributesEqual(Instruction* other) const {
   return field().raw() == other->AsGuardField()->field().raw();
 }
 
 
 bool AssertAssignableInstr::AttributesEqual(Instruction* other) const {
   AssertAssignableInstr* other_assert = other->AsAssertAssignable();
   ASSERT(other_assert != NULL);
   // This predicate has to be commutative for DominatorBasedCSE to work.
   // TODO(fschneider): Eliminate more asserts with subtype relation.
@@ skipping 2932 matching lines @@
     case Token::kTRUNCDIV: return 0;
     case Token::kMOD: return 1;
     default: UNIMPLEMENTED(); return -1;
   }
 }
 
 
 #undef __
 
 }  // namespace dart