[turbofan] Desugar JSUnaryNot(x) to Select(x, false, true).

src/full-codegen/x64/full-codegen-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/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 618 matching lines @@
   }
 }
 
 
 void FullCodeGenerator::DoTest(Expression* condition,
                                Label* if_true,
                                Label* if_false,
                                Label* fall_through) {
   Handle<Code> ic = ToBooleanStub::GetUninitialized(isolate());
   CallIC(ic, condition->test_id());
-  __ testp(result_register(), result_register());
-  // The stub returns nonzero for true.
-  Split(not_zero, if_true, if_false, fall_through);
+  __ CompareRoot(result_register(), Heap::kTrueValueRootIndex);
+  Split(equal, if_true, if_false, fall_through);
 }
 
 
 void FullCodeGenerator::Split(Condition cc,
                               Label* if_true,
                               Label* if_false,
                               Label* fall_through) {
   if (if_false == fall_through) {
     __ j(cc, if_true);
   } else if (if_true == fall_through) {
@@ skipping 1348 matching lines @@
       // if (!result.done) goto l_try;
       __ bind(&l_loop);
       __ Move(load_receiver, rax);
       __ Push(load_receiver);                               // save result
       __ LoadRoot(load_name, Heap::kdone_stringRootIndex);  // "done"
       __ Move(LoadDescriptor::SlotRegister(),
               SmiFromSlot(expr->DoneFeedbackSlot()));
       CallLoadIC(NOT_INSIDE_TYPEOF);  // rax=result.done
       Handle<Code> bool_ic = ToBooleanStub::GetUninitialized(isolate());
       CallIC(bool_ic);
-      __ testp(result_register(), result_register());
-      __ j(zero, &l_try);
+      __ CompareRoot(result_register(), Heap::kTrueValueRootIndex);
+      __ j(not_equal, &l_try);
 
       // result.value
       __ Pop(load_receiver);                             // result
       __ LoadRoot(load_name, Heap::kvalue_stringRootIndex);  // "value"
       __ Move(LoadDescriptor::SlotRegister(),
               SmiFromSlot(expr->ValueFeedbackSlot()));
       CallLoadIC(NOT_INSIDE_TYPEOF);                     // result.value in rax
       context()->DropAndPlug(2, rax);                    // drop iter and g
       break;
     }
@@ skipping 2826 matching lines @@
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64