[builtins] Introduce proper Float64Atan and Float64Atan2 operators.

test/unittests/compiler/js-builtin-reducer-unittest.cc

 // Copyright 2014 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/compiler/js-builtin-reducer.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/node-properties.h"
 #include "src/compiler/simplified-operator.h"
 #include "src/compiler/typer.h"
 #include "src/isolate-inl.h"
@@ skipping 185 matching lines @@
                                   UndefinedConstant(), p0, context, frame_state,
                                   effect, control);
     Reduction r = Reduce(call);
 
     ASSERT_TRUE(r.Changed());
     EXPECT_THAT(r.replacement(), IsTruncateFloat64ToFloat32(p0));
   }
 }
 
 // -----------------------------------------------------------------------------
+// Math.atan
+
+TEST_F(JSBuiltinReducerTest, MathAtan) {
+  Node* function = MathFunction("atan");
+
+  Node* effect = graph()->start();
+  Node* control = graph()->start();
+  Node* context = UndefinedConstant();
+  Node* frame_state = graph()->start();
+  TRACED_FOREACH(Type*, t0, kNumberTypes) {
+    Node* p0 = Parameter(t0, 0);
+    Node* call = graph()->NewNode(javascript()->CallFunction(3), function,
+                                  UndefinedConstant(), p0, context, frame_state,
+                                  effect, control);
+    Reduction r = Reduce(call);
+
+    ASSERT_TRUE(r.Changed());
+    EXPECT_THAT(r.replacement(), IsNumberAtan(p0));
+  }
+}
+
+// -----------------------------------------------------------------------------
+// Math.atan2
+
+TEST_F(JSBuiltinReducerTest, MathAtan2) {
+  Node* function = MathFunction("atan2");
+
+  Node* effect = graph()->start();
+  Node* control = graph()->start();
+  Node* context = UndefinedConstant();
+  Node* frame_state = graph()->start();
+  TRACED_FOREACH(Type*, t0, kNumberTypes) {
+    Node* p0 = Parameter(t0, 0);
+    TRACED_FOREACH(Type*, t1, kNumberTypes) {
+      Node* p1 = Parameter(t1, 0);
+      Node* call = graph()->NewNode(javascript()->CallFunction(4), function,
+                                    UndefinedConstant(), p0, p1, context,
+                                    frame_state, effect, control);
+      Reduction r = Reduce(call);
+
+      ASSERT_TRUE(r.Changed());
+      EXPECT_THAT(r.replacement(), IsNumberAtan2(p0, p1));
+    }
+  }
+}
+
+// -----------------------------------------------------------------------------
 // Math.log
 
 TEST_F(JSBuiltinReducerTest, MathLog) {
   Node* function = MathFunction("log");
 
   Node* effect = graph()->start();
   Node* control = graph()->start();
   Node* context = UndefinedConstant();
   Node* frame_state = graph()->start();
   TRACED_FOREACH(Type*, t0, kNumberTypes) {
@@ skipping 48 matching lines @@
     Reduction r = Reduce(call);
 
     ASSERT_TRUE(r.Changed());
     EXPECT_THAT(r.replacement(), IsStringFromCharCode(p0));
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8