ARM64: Introduce TempDoubleRegister as a lithium operand constraint.

src/lithium-allocator.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "v8.h"
 #include "lithium-allocator-inl.h"
 
 #include "hydrogen.h"
 #include "string-stream.h"
 
@@ skipping 28 matching lines @@
                          LOperand* operand,
                          LOperand* hint)
     : operand_(operand),
       hint_(hint),
       pos_(pos),
       next_(NULL),
       requires_reg_(false),
       register_beneficial_(true) {
   if (operand_ != NULL && operand_->IsUnallocated()) {
     LUnallocated* unalloc = LUnallocated::cast(operand_);
-    requires_reg_ = unalloc->HasRegisterPolicy();
+    requires_reg_ = unalloc->HasRegisterPolicy() ||
+        unalloc->HasDoubleRegisterPolicy();
     register_beneficial_ = !unalloc->HasAnyPolicy();
   }
   ASSERT(pos_.IsValid());
 }
 
 
 bool UsePosition::HasHint() const {
   return hint_ != NULL && !hint_->IsUnallocated();
 }
 
@@ skipping 938 matching lines @@
             if (temp->IsRegister()) continue;
             if (temp->IsUnallocated()) {
               LUnallocated* temp_unalloc = LUnallocated::cast(temp);
               if (temp_unalloc->HasFixedPolicy()) {
                 continue;
               }
             }
           }
           Use(block_start_position, curr_position.InstructionEnd(), temp, NULL);
           Define(curr_position, temp, NULL);
+
+          if (temp->IsUnallocated()) {
+            LUnallocated* temp_unalloc = LUnallocated::cast(temp);
+            if (temp_unalloc->HasDoubleRegisterPolicy()) {
+              double_artificial_registers_.Add(
+                  temp_unalloc->virtual_register() - first_artificial_register_,
+                  zone());
+            }
+          }
         }
       }
     }
 
     index = index - 1;
   }
 }
 
 
 void LAllocator::ResolvePhis(HBasicBlock* block) {
@@ skipping 70 matching lines @@
   if (!AllocationOk()) return false;
   PopulatePointerMaps();
   ConnectRanges();
   ResolveControlFlow();
   return true;
 }
 
 
 void LAllocator::MeetRegisterConstraints() {
   LAllocatorPhase phase("L_Register constraints", this);
-  first_artificial_register_ = next_virtual_register_;
   const ZoneList<HBasicBlock*>* blocks = graph_->blocks();
   for (int i = 0; i < blocks->length(); ++i) {
     HBasicBlock* block = blocks->at(i);
     MeetRegisterConstraints(block);
     if (!AllocationOk()) return;
   }
 }
 
 
 void LAllocator::ResolvePhis() {
@@ skipping 1080 matching lines @@
     isolate()->GetHTracer()->TraceLiveRanges(name(), allocator_);
   }
 
 #ifdef DEBUG
   if (allocator_ != NULL) allocator_->Verify();
 #endif
 }
 
 
 } }  // namespace v8::internal