[calls] Consistent call protocol for calls.

src/arm64/macro-assembler-arm64.cc

 // Copyright 2013 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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 2553 matching lines @@
 
   // The code below is made a lot easier because the calling code already sets
   // up actual and expected registers according to the contract if values are
   // passed in registers.
   DCHECK(actual.is_immediate() || actual.reg().is(x0));
   DCHECK(expected.is_immediate() || expected.reg().is(x2));
   DCHECK((!code_constant.is_null() && code_reg.is(no_reg)) || code_reg.is(x3));
 
   if (expected.is_immediate()) {
     DCHECK(actual.is_immediate());
+    Mov(x0, actual.immediate());
     if (expected.immediate() == actual.immediate()) {
       definitely_matches = true;
 
     } else {
-      Mov(x0, actual.immediate());
       if (expected.immediate() ==
           SharedFunctionInfo::kDontAdaptArgumentsSentinel) {
         // Don't worry about adapting arguments for builtins that
         // don't want that done. Skip adaption code by making it look
         // like we have a match between expected and actual number of
         // arguments.
         definitely_matches = true;
       } else {
         *definitely_mismatches = true;
         // Set up x2 for the argument adaptor.
         Mov(x2, expected.immediate());
       }
     }
 
   } else {  // expected is a register.
     Operand actual_op = actual.is_immediate() ? Operand(actual.immediate())
                                               : Operand(actual.reg());
+    Mov(x0, actual_op);
     // If actual == expected perform a regular invocation.
     Cmp(expected.reg(), actual_op);
     B(eq, &regular_invoke);
-    // Otherwise set up x0 for the argument adaptor.
-    Mov(x0, actual_op);
   }
 
   // If the argument counts may mismatch, generate a call to the argument
   // adaptor.
   if (!definitely_matches) {
     if (!code_constant.is_null()) {
       Mov(x3, Operand(code_constant));
       Add(x3, x3, Code::kHeaderSize - kHeapObjectTag);
     }
 
@@ skipping 2510 matching lines @@
 }
 
 
 #undef __
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64