Implement experimental exponentiation operator

src/runtime.js

 // Copyright 2006-2008 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.
 
 // This files contains runtime support implemented in JavaScript.
 
 // CAUTION: Some of the functions specified in this file are called
 // directly from compiled code. These are the functions with names in
 // ALL CAPS. The compiled code passes the first argument in 'this'.
 
@@ skipping 205 matching lines @@
 
 
 // ECMA-262, section 11.5.3, page 49.
 function MOD(y) {
   var x = IS_NUMBER(this) ? this : %NonNumberToNumber(this);
   if (!IS_NUMBER(y)) y = %NonNumberToNumber(y);
   return %NumberMod(x, y);
 }
 
 
+// ECMA-262, section 11.5.3, page 49.
+function EXP(y) {
+  var x = IS_NUMBER(this) ? this : %NonNumberToNumber(this);
+  if (!IS_NUMBER(y)) y = %NonNumberToNumber(y);
+  return %_MathPow(x, y);
+}
+
+
 
 /* -------------------------------------------
    - - -   B i t   o p e r a t i o n s   - - -
    -------------------------------------------
 */
 
 // ECMA-262, section 11.10, page 57.
 function BIT_OR(y) {
   var x = IS_NUMBER(this) ? this : %NonNumberToNumber(this);
   if (!IS_NUMBER(y)) y = %NonNumberToNumber(y);
@@ skipping 451 matching lines @@
   return i;
 }
 
 
 // NOTE: Setting the prototype for Array must take place as early as
 // possible due to code generation for array literals.  When
 // generating code for a array literal a boilerplate array is created
 // that is cloned when running the code.  It is essential that the
 // boilerplate gets the right prototype.
 %FunctionSetPrototype($Array, new $Array(0));