A64: Use a scope utility to allocate scratch registers.

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 830 matching lines @@
     Address entry = deopt_jump_table_[i].address;
     Deoptimizer::BailoutType type = deopt_jump_table_[i].bailout_type;
     int id = Deoptimizer::GetDeoptimizationId(isolate(), entry, type);
     if (id == Deoptimizer::kNotDeoptimizationEntry) {
       Comment(";;; jump table entry %d.", i);
     } else {
       Comment(";;; jump table entry %d: deoptimization bailout %d.", i, id);
     }
     if (deopt_jump_table_[i].needs_frame) {
       ASSERT(!info()->saves_caller_doubles());
-      __ Mov(__ Tmp0(), Operand(ExternalReference::ForDeoptEntry(entry)));
+
+      UseScratchRegisterScope temps(masm());
+      Register stub_deopt_entry = temps.AcquireX();
+      Register stub_marker = temps.AcquireX();
+
+      __ Mov(stub_deopt_entry,
+             Operand(ExternalReference::ForDeoptEntry(entry)));
       if (needs_frame.is_bound()) {
         __ B(&needs_frame);
       } else {
         __ Bind(&needs_frame);
         // This variant of deopt can only be used with stubs. Since we don't
         // have a function pointer to install in the stack frame that we're
         // building, install a special marker there instead.
-        // TODO(jochen): Revisit the use of TmpX().
         ASSERT(info()->IsStub());
-        __ Mov(__ Tmp1(), Operand(Smi::FromInt(StackFrame::STUB)));
-        __ Push(lr, fp, cp, __ Tmp1());
+        __ Mov(stub_marker, Operand(Smi::FromInt(StackFrame::STUB)));
+        __ Push(lr, fp, cp, stub_marker);
         __ Add(fp, __ StackPointer(), 2 * kPointerSize);
-        __ Call(__ Tmp0());
+        __ Call(stub_deopt_entry);
       }
     } else {
       if (info()->saves_caller_doubles()) {
         ASSERT(info()->IsStub());
         RestoreCallerDoubles();
       }
       __ Call(entry, RelocInfo::RUNTIME_ENTRY);
     }
     masm()->CheckConstPool(false, false);
   }
@@ skipping 4787 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