[builtins] Introduce proper Float64Atan and Float64Atan2 operators.

src/builtins.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.
 
 #include "src/builtins.h"
 
 #include "src/api-arguments.h"
 #include "src/api-natives.h"
 #include "src/api.h"
+#include "src/base/ieee754.h"
 #include "src/base/once.h"
 #include "src/bootstrapper.h"
 #include "src/code-factory.h"
 #include "src/code-stub-assembler.h"
 #include "src/dateparser-inl.h"
 #include "src/elements.h"
 #include "src/frames-inl.h"
 #include "src/gdb-jit.h"
 #include "src/ic/handler-compiler.h"
 #include "src/ic/ic.h"
@@ skipping 2262 matching lines @@
 
 // ES6 section 20.2.2.4 Math.asin ( x )
 BUILTIN(MathAsin) {
   HandleScope scope(isolate);
   DCHECK_EQ(2, args.length());
   Handle<Object> x = args.at<Object>(1);
   ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, x, Object::ToNumber(x));
   return *isolate->factory()->NewHeapNumber(std::asin(x->Number()));
 }
 
+// ES6 section 20.2.2.6 Math.atan ( x )
+void Builtins::Generate_MathAtan(CodeStubAssembler* assembler) {
+  using compiler::Node;
 
-// ES6 section 20.2.2.6 Math.atan ( x )
-BUILTIN(MathAtan) {
-  HandleScope scope(isolate);
-  DCHECK_EQ(2, args.length());
-  Handle<Object> x = args.at<Object>(1);
-  ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, x, Object::ToNumber(x));
-  return *isolate->factory()->NewHeapNumber(std::atan(x->Number()));
+  Node* x = assembler->Parameter(1);
+  Node* context = assembler->Parameter(4);
+  Node* x_value = assembler->TruncateTaggedToFloat64(context, x);
+  Node* value = assembler->Float64Atan(x_value);
+  Node* result = assembler->ChangeFloat64ToTagged(value);
+  assembler->Return(result);
+}
+
+// ES6 section 20.2.2.8 Math.atan2 ( y, x )
+void Builtins::Generate_MathAtan2(CodeStubAssembler* assembler) {
+  using compiler::Node;
+
+  Node* y = assembler->Parameter(1);
+  Node* x = assembler->Parameter(2);
+  Node* context = assembler->Parameter(5);
+  Node* y_value = assembler->TruncateTaggedToFloat64(context, y);
+  Node* x_value = assembler->TruncateTaggedToFloat64(context, x);
+  Node* value = assembler->Float64Atan2(y_value, x_value);
+  Node* result = assembler->ChangeFloat64ToTagged(value);
+  assembler->Return(result);
 }
 
 namespace {
 
 void Generate_MathRoundingOperation(
     CodeStubAssembler* assembler,
     compiler::Node* (CodeStubAssembler::*float64op)(compiler::Node*)) {
   typedef CodeStubAssembler::Label Label;
   typedef compiler::Node Node;
   typedef CodeStubAssembler::Variable Variable;
@@ skipping 3631 matching lines @@
 BUILTIN_LIST_T(DEFINE_BUILTIN_ACCESSOR_T)
 BUILTIN_LIST_H(DEFINE_BUILTIN_ACCESSOR_H)
 BUILTIN_LIST_DEBUG_A(DEFINE_BUILTIN_ACCESSOR_A)
 #undef DEFINE_BUILTIN_ACCESSOR_C
 #undef DEFINE_BUILTIN_ACCESSOR_A
 #undef DEFINE_BUILTIN_ACCESSOR_T
 #undef DEFINE_BUILTIN_ACCESSOR_H
 
 }  // namespace internal
 }  // namespace v8