A64: Update DoAllocate() to use a W register for the size

src/a64/lithium-codegen-a64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1487 matching lines @@
     flags = static_cast<AllocationFlags>(flags | PRETENURE_OLD_POINTER_SPACE);
   } else if (instr->hydrogen()->IsOldDataSpaceAllocation()) {
     ASSERT(!instr->hydrogen()->IsNewSpaceAllocation());
     flags = static_cast<AllocationFlags>(flags | PRETENURE_OLD_DATA_SPACE);
   }
 
   if (instr->size()->IsConstantOperand()) {
     int32_t size = ToInteger32(LConstantOperand::cast(instr->size()));
     __ Allocate(size, result, temp1, temp2, deferred->entry(), flags);
   } else {
-    Register size = ToRegister(instr->size());
-    __ Allocate(size, result, temp1, temp2, deferred->entry(), flags);
+    Register size = ToRegister32(instr->size());
+    __ Sxtw(size.X(), size);
+    __ Allocate(size.X(), result, temp1, temp2, deferred->entry(), flags);
   }
 
   __ Bind(deferred->exit());
 
   if (instr->hydrogen()->MustPrefillWithFiller()) {
     if (instr->size()->IsConstantOperand()) {
       int32_t size = ToInteger32(LConstantOperand::cast(instr->size()));
       __ Mov(temp1, size - kPointerSize);
     } else {
-      __ Sub(temp1, ToRegister(instr->size()), kPointerSize);
+      __ Sub(temp1.W(), ToRegister32(instr->size()), kPointerSize);
     }
     __ Sub(result, result, kHeapObjectTag);
 
     // TODO(jbramley): Optimize this loop using stp.
     Label loop;
     __ Bind(&loop);
     __ Mov(temp2, Operand(isolate()->factory()->one_pointer_filler_map()));
     __ Str(temp2, MemOperand(result, temp1));
     __ Subs(temp1, temp1, kPointerSize);
     __ B(ge, &loop);
 
     __ Add(result, result, kHeapObjectTag);
   }
 }
 
 
 void LCodeGen::DoDeferredAllocate(LAllocate* instr) {
   // TODO(3095996): Get rid of this. For now, we need to make the
   // result register contain a valid pointer because it is already
   // contained in the register pointer map.
   __ Mov(ToRegister(instr->result()), Operand(Smi::FromInt(0)));
 
   PushSafepointRegistersScope scope(this, Safepoint::kWithRegisters);
   // We're in a SafepointRegistersScope so we can use any scratch registers.
   Register size = x0;
   if (instr->size()->IsConstantOperand()) {
     __ Mov(size, Operand(ToSmi(LConstantOperand::cast(instr->size()))));
   } else {
-    __ SmiTag(size, ToRegister(instr->size()));
+    __ SmiTag(size, ToRegister32(instr->size()).X());
   }
   int flags = AllocateDoubleAlignFlag::encode(
       instr->hydrogen()->MustAllocateDoubleAligned());
   if (instr->hydrogen()->IsOldPointerSpaceAllocation()) {
     ASSERT(!instr->hydrogen()->IsOldDataSpaceAllocation());
     ASSERT(!instr->hydrogen()->IsNewSpaceAllocation());
     flags = AllocateTargetSpace::update(flags, OLD_POINTER_SPACE);
   } else if (instr->hydrogen()->IsOldDataSpaceAllocation()) {
     ASSERT(!instr->hydrogen()->IsNewSpaceAllocation());
     flags = AllocateTargetSpace::update(flags, OLD_DATA_SPACE);
@@ skipping 4158 matching lines @@
   __ Bind(&out_of_object);
   __ Ldr(result, FieldMemOperand(object, JSObject::kPropertiesOffset));
   // Index is equal to negated out of object property index plus 1.
   __ Sub(result, result, Operand::UntagSmiAndScale(index, kPointerSizeLog2));
   __ Ldr(result, FieldMemOperand(result,
                                  FixedArray::kHeaderSize - kPointerSize));
   __ Bind(&done);
 }
 
 } }  // namespace v8::internal