[builtins] Migrate Math.log to TurboFan.

src/js/math.js

 // 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.
 
 (function(global, utils) {
 "use strict";
 
 %CheckIsBootstrapping();
 
 // -------------------------------------------------------------------
@@ skipping 25 matching lines @@
   y = +y;
   x = +x;
   return %MathAtan2(y, x);
 }
 
 // ECMA 262 - 15.8.2.8
 function MathExp(x) {
   return %MathExpRT(TO_NUMBER(x));
 }
 
-// ECMA 262 - 15.8.2.10
-function MathLog(x) {
-  return %_MathLogRT(TO_NUMBER(x));
-}
-
 // ECMA 262 - 15.8.2.13
 function MathPowJS(x, y) {
   return %_MathPow(TO_NUMBER(x), TO_NUMBER(y));
 }
 
 // ECMA 262 - 15.8.2.14
 function MathRandom() {
   // While creating a startup snapshot, %GenerateRandomNumbers returns a
   // normal array containing a single random number, and has to be called for
   // every new random number.
@@ skipping 25 matching lines @@
   if (x < 0) return -1;
   // -0, 0 or NaN.
   return x;
 }
 
 // ES6 draft 09-27-13, section 20.2.2.5.
 function MathAsinh(x) {
   x = TO_NUMBER(x);
   // Idempotent for NaN, +/-0 and +/-Infinity.
   if (x === 0 || !NUMBER_IS_FINITE(x)) return x;
-  if (x > 0) return MathLog(x + %math_sqrt(x * x + 1));
+  if (x > 0) return %math_log(x + %math_sqrt(x * x + 1));
   // This is to prevent numerical errors caused by large negative x.
-  return -MathLog(-x + %math_sqrt(x * x + 1));
+  return -%math_log(-x + %math_sqrt(x * x + 1));
 }
 
 // ES6 draft 09-27-13, section 20.2.2.3.
 function MathAcosh(x) {
   x = TO_NUMBER(x);
   if (x < 1) return NaN;
   // Idempotent for NaN and +Infinity.
   if (!NUMBER_IS_FINITE(x)) return x;
-  return MathLog(x + %math_sqrt(x + 1) * %math_sqrt(x - 1));
+  return %math_log(x + %math_sqrt(x + 1) * %math_sqrt(x - 1));
 }
 
 // ES6 draft 09-27-13, section 20.2.2.7.
 function MathAtanh(x) {
   x = TO_NUMBER(x);
   // Idempotent for +/-0.
   if (x === 0) return x;
   // Returns NaN for NaN and +/- Infinity.
   if (!NUMBER_IS_FINITE(x)) return NaN;
-  return 0.5 * MathLog((1 + x) / (1 - x));
+  return 0.5 * %math_log((1 + x) / (1 - x));
 }
 
 // ES6 draft 09-27-13, section 20.2.2.17.
 function MathHypot(x, y) {  // Function length is 2.
   // We may want to introduce fast paths for two arguments and when
   // normalization to avoid overflow is not necessary.  For now, we
   // simply assume the general case.
   var length = arguments.length;
   var max = 0;
   for (var i = 0; i < length; i++) {
@@ skipping 64 matching lines @@
   "SQRT1_2", 0.7071067811865476,
   "SQRT2", 1.4142135623730951
 ]);
 
 // Set up non-enumerable functions of the Math object and
 // set their names.
 utils.InstallFunctions(GlobalMath, DONT_ENUM, [
   "random", MathRandom,
   "abs", MathAbs,
   "exp", MathExp,
-  "log", MathLog,
   "atan2", MathAtan2JS,
   "pow", MathPowJS,
   "sign", MathSign,
   "asinh", MathAsinh,
   "acosh", MathAcosh,
   "atanh", MathAtanh,
   "hypot", MathHypot,
   "cbrt", MathCbrt
 ]);
 
 %SetForceInlineFlag(MathAbs);
 %SetForceInlineFlag(MathAtan2JS);
 %SetForceInlineFlag(MathRandom);
 %SetForceInlineFlag(MathSign);
 
 // -------------------------------------------------------------------
 // Exports
 
 utils.Export(function(to) {
   to.MathAbs = MathAbs;
   to.MathExp = MathExp;
   to.IntRandom = MathRandomRaw;
 });
 
 })