[builtins] Make Math.ceil, Math.trunc and Math.round optimizable.

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 21 matching lines @@
 
 // ECMA 262 - 15.8.2.5
 // The naming of y and x matches the spec, as does the order in which
 // ToNumber (valueOf) is called.
 function MathAtan2JS(y, x) {
   y = +y;
   x = +x;
   return %MathAtan2(y, x);
 }
 
-// ECMA 262 - 15.8.2.6
-function MathCeil(x) {
-  return -%math_floor(-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));
 }
 
@@ skipping 17 matching lines @@
 }
 
 function MathRandomRaw() {
   if (nextRandomIndex <= kRandomNumberStart) {
     randomNumbers = %GenerateRandomNumbers(randomNumbers);
     nextRandomIndex = randomNumbers.length;
   }
   return %_DoubleLo(randomNumbers[--nextRandomIndex]) & 0x3FFFFFFF;
 }
 
-// ECMA 262 - 15.8.2.15
-function MathRound(x) {
-  return %RoundNumber(TO_NUMBER(x));
-}
-
 // ES6 draft 09-27-13, section 20.2.2.28.
 function MathSign(x) {
   x = +x;
   if (x > 0) return 1;
   if (x < 0) return -1;
   // -0, 0 or NaN.
   return x;
 }
 
-// ES6 draft 09-27-13, section 20.2.2.34.
-function MathTrunc(x) {
-  x = +x;
-  if (x > 0) return %math_floor(x);
-  if (x < 0) return -%math_floor(-x);
-  // -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));
   // This is to prevent numerical errors caused by large negative x.
   return -MathLog(-x + %math_sqrt(x * x + 1));
 }
 
@@ skipping 95 matching lines @@
   "PI", 3.1415926535897932,
   "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,
-  "ceil", MathCeil,
   "exp", MathExp,
   "log", MathLog,
-  "round", MathRound,
   "atan2", MathAtan2JS,
   "pow", MathPowJS,
   "sign", MathSign,
-  "trunc", MathTrunc,
   "asinh", MathAsinh,
   "acosh", MathAcosh,
   "atanh", MathAtanh,
   "hypot", MathHypot,
   "clz32", MathClz32JS,
   "cbrt", MathCbrt
 ]);
 
 %SetForceInlineFlag(MathAbs);
 %SetForceInlineFlag(MathAtan2JS);
-%SetForceInlineFlag(MathCeil);
 %SetForceInlineFlag(MathClz32JS);
 %SetForceInlineFlag(MathRandom);
 %SetForceInlineFlag(MathSign);
-%SetForceInlineFlag(MathTrunc);
 
 // -------------------------------------------------------------------
 // Exports
 
 utils.Export(function(to) {
   to.MathAbs = MathAbs;
   to.MathExp = MathExp;
   to.IntRandom = MathRandomRaw;
 });
 
 })