A64: a smi can hold any signed integer, so we don't need a deferred tag method for it

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 4303 matching lines @@
   } else {
     __ B(deferred->entry());
   }
 
   __ Bind(deferred->exit());
   __ Str(input, FieldMemOperand(result, HeapNumber::kValueOffset));
   __ Bind(&done);
 }
 
 
-void LCodeGen::DoDeferredNumberTagI(LInstruction* instr,
+void LCodeGen::DoDeferredNumberTagU(LInstruction* instr,
                                     LOperand* value,
                                     LOperand* temp1,
-                                    LOperand* temp2,
-                                    IntegerSignedness signedness) {
+                                    LOperand* temp2) {
   Label slow, convert_and_store;
   Register src = ToRegister32(value);
   Register dst = ToRegister(instr->result());
   Register scratch1 = ToRegister(temp1);
 
   if (FLAG_inline_new) {
     Register scratch2 = ToRegister(temp2);
     __ AllocateHeapNumber(dst, &slow, scratch1, scratch2);
     __ B(&convert_and_store);
   }
@@ skipping 17 matching lines @@
     PushSafepointRegistersScope scope(this, Safepoint::kWithRegisters);
 
     CallRuntimeFromDeferred(Runtime::kAllocateHeapNumber, 0, instr);
     __ StoreToSafepointRegisterSlot(x0, dst);
   }
 
   // Convert number to floating point and store in the newly allocated heap
   // number.
   __ Bind(&convert_and_store);
   DoubleRegister dbl_scratch = double_scratch();
-  if (signedness == SIGNED_INT32) {
-    ASM_UNIMPLEMENTED_BREAK("DeferredNumberTagI - signed int32 case.");
-  } else {
-    ASSERT(signedness == UNSIGNED_INT32);
-    __ Ucvtf(dbl_scratch, src);
-  }
+  __ Ucvtf(dbl_scratch, src);
   __ Str(dbl_scratch, FieldMemOperand(dst, HeapNumber::kValueOffset));
 }
 
 
 void LCodeGen::DoNumberTagU(LNumberTagU* instr) {
   class DeferredNumberTagU: public LDeferredCode {
    public:
     DeferredNumberTagU(LCodeGen* codegen, LNumberTagU* instr)
         : LDeferredCode(codegen), instr_(instr) { }
     virtual void Generate() {
-      codegen()->DoDeferredNumberTagI(instr_,
+      codegen()->DoDeferredNumberTagU(instr_,
                                       instr_->value(),
                                       instr_->temp1(),
-                                      instr_->temp2(),
-                                      UNSIGNED_INT32);
+                                      instr_->temp2());
     }
     virtual LInstruction* instr() { return instr_; }
    private:
     LNumberTagU* instr_;
   };
 
   Register value = ToRegister(instr->value());
   Register result = ToRegister(instr->result());
 
   DeferredNumberTagU* deferred = new(zone()) DeferredNumberTagU(this, instr);
@@ skipping 1209 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