Implement experimental exponentiation operator

test/cctest/compiler/test-run-jsops.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/v8.h"
 
 #include "test/cctest/compiler/function-tester.h"
 
 using namespace v8::internal;
 using namespace v8::internal::compiler;
@@ skipping 63 matching lines @@
   T.CheckCall(3, 8, 5);
   T.CheckCall(T.Val(3), T.Val("8"), T.Val(5));
   T.CheckCall(T.Val(3), T.Val(8), T.Val("5"));
   T.CheckCall(T.Val(1), T.Val("3"), T.Val("2"));
   T.CheckCall(T.nan(), T.Val("3"), T.Val("B"));
   T.CheckCall(T.Val(1), T.Val("3"), T.NewObject("([2])"));
   T.CheckCall(T.nan(), T.Val("3"), T.NewObject("({})"));
 }
 
 
+TEST(BinopExponentiate) {
+  FLAG_harmony_exponentiation = true;
+  FunctionTester T("(function(a,b) { return a ** b; })");
+
+  T.CheckCall(256, 2, 8);
+  T.CheckCall(T.Val(256), T.Val("2"), T.Val(8));
+  T.CheckCall(T.Val(256), T.Val(2), T.Val("8"));
+  T.CheckCall(T.Val(1), T.Val("256"), T.Val("0"));
+  T.CheckCall(T.nan(), T.Val("3"), T.Val("B"));
+  T.CheckCall(T.Val(0.25), T.Val("2"), T.NewObject("([-2])"));
+  T.CheckCall(T.nan(), T.Val("3"), T.NewObject("({})"));
+}
+
+
 TEST(BinopShiftLeft) {
   FunctionTester T("(function(a,b) { return a << b; })");
 
   T.CheckCall(4, 2, 1);
   T.CheckCall(T.Val(4), T.Val("2"), T.Val(1));
   T.CheckCall(T.Val(4), T.Val(2), T.Val("1"));
 }
 
 
 TEST(BinopShiftRight) {
@@ skipping 442 matching lines @@
       "    get z() { return 0; }"
       "    constructor() {}"
       "  }"
       "  return new C().x() + C.y();"
       "})";
   FunctionTester T(src);
 
   T.CheckCall(T.Val(65), T.Val(23), T.Val(42));
   T.CheckCall(T.Val("ab"), T.Val("a"), T.Val("b"));
 }