[turbofan] Switch passing of new.target to register.

src/x64/macro-assembler-x64.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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 689 matching lines @@
 
 void MacroAssembler::InvokeBuiltin(int native_context_index, InvokeFlag flag,
                                    const CallWrapper& call_wrapper) {
   // You can't call a builtin without a valid frame.
   DCHECK(flag == JUMP_FUNCTION || has_frame());
 
   // Rely on the assertion to check that the number of provided
   // arguments match the expected number of arguments. Fake a
   // parameter count to avoid emitting code to do the check.
   ParameterCount expected(0);
-  GetBuiltinEntry(rdx, native_context_index);
-  InvokeCode(rdx, expected, expected, flag, call_wrapper);
+  GetBuiltinEntry(r8, native_context_index);
+  InvokeCode(r8, no_reg, expected, expected, flag, call_wrapper);
 }
 
 
 void MacroAssembler::GetBuiltinFunction(Register target,
                                         int native_context_index) {
   // Load the builtins object into target register.
   movp(target, Operand(rsi, Context::SlotOffset(Context::GLOBAL_OBJECT_INDEX)));
   movp(target, FieldOperand(target, JSGlobalObject::kNativeContextOffset));
   movp(target, ContextOperand(target, native_context_index));
 }
@@ skipping 3247 matching lines @@
   Set(rax, 0);  // No arguments.
   LoadAddress(rbx,
               ExternalReference(Runtime::kHandleDebuggerStatement, isolate()));
   CEntryStub ces(isolate(), 1);
   DCHECK(AllowThisStubCall(&ces));
   Call(ces.GetCode(), RelocInfo::DEBUGGER_STATEMENT);
 }
 
 
 void MacroAssembler::InvokeFunction(Register function,
+                                    Register new_target,
                                     const ParameterCount& actual,
                                     InvokeFlag flag,
                                     const CallWrapper& call_wrapper) {
-  movp(rdx, FieldOperand(function, JSFunction::kSharedFunctionInfoOffset));
+  movp(rbx, FieldOperand(function, JSFunction::kSharedFunctionInfoOffset));
   LoadSharedFunctionInfoSpecialField(
-      rbx, rdx, SharedFunctionInfo::kFormalParameterCountOffset);
+      rbx, rbx, SharedFunctionInfo::kFormalParameterCountOffset);
 
   ParameterCount expected(rbx);
-  InvokeFunction(function, expected, actual, flag, call_wrapper);
+  InvokeFunction(function, new_target, expected, actual, flag, call_wrapper);
 }
 
 
 void MacroAssembler::InvokeFunction(Handle<JSFunction> function,
                                     const ParameterCount& expected,
                                     const ParameterCount& actual,
                                     InvokeFlag flag,
                                     const CallWrapper& call_wrapper) {
   Move(rdi, function);
-  InvokeFunction(rdi, expected, actual, flag, call_wrapper);
+  InvokeFunction(rdi, no_reg, expected, actual, flag, call_wrapper);
 }
 
 
 void MacroAssembler::InvokeFunction(Register function,
+                                    Register new_target,
                                     const ParameterCount& expected,
                                     const ParameterCount& actual,
                                     InvokeFlag flag,
                                     const CallWrapper& call_wrapper) {
   DCHECK(function.is(rdi));
   movp(rsi, FieldOperand(function, JSFunction::kContextOffset));
-  // Advances rdx to the end of the Code object header, to the start of
+  // Advances r8 to the end of the Code object header, to the start of
   // the executable code.
-  movp(rdx, FieldOperand(rdi, JSFunction::kCodeEntryOffset));
-  InvokeCode(rdx, expected, actual, flag, call_wrapper);
+  movp(r8, FieldOperand(rdi, JSFunction::kCodeEntryOffset));
+  InvokeCode(r8, new_target, expected, actual, flag, call_wrapper);
 }
 
 
 void MacroAssembler::InvokeCode(Register code,
+                                Register new_target,
                                 const ParameterCount& expected,
                                 const ParameterCount& actual,
                                 InvokeFlag flag,
                                 const CallWrapper& call_wrapper) {
   // You can't call a function without a valid frame.
   DCHECK(flag == JUMP_FUNCTION || has_frame());
 
+  // Ensure new target is passed in the correct register. Otherwise clear the
+  // appropriate register in case new target is not given.
+  DCHECK_IMPLIES(new_target.is_valid(), new_target.is(rdx));
+  if (!new_target.is_valid()) {
+    LoadRoot(rdx, Heap::kUndefinedValueRootIndex);
+  }
+
   Label done;
   bool definitely_mismatches = false;
   InvokePrologue(expected,
                  actual,
                  &done,
                  &definitely_mismatches,
                  flag,
                  Label::kNear,
                  call_wrapper);
   if (!definitely_mismatches) {
@@ skipping 1469 matching lines @@
   movl(rax, dividend);
   shrl(rax, Immediate(31));
   addl(rdx, rax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64