Reland: Use simple/fast inline function version of MinMax in JS

Use the simple inline function version of {Min, Max} where possible to
improve performance

Now uses an forced inline js function instead of a python macro
to avoid expressions be evaluated twice

Follow-up to CR: https://codereview.chromium.org/1331993004

Review URL: https://codereview.chromium.org/1410473002

Cr-Commit-Position: refs/heads/master@{#31411}

src/js/array.js

@@ -16,7 +16,7 @@ var FLAG_harmony_tolength;
 var GlobalArray = global.Array;
 var InternalArray = utils.InternalArray;
 var InternalPackedArray = utils.InternalPackedArray;
-var MathMin;
+var MinSimple;
 var ObjectHasOwnProperty;
 var ObjectIsFrozen;
 var ObjectIsSealed;
@@ -28,7 +28,7 @@ var unscopablesSymbol = utils.ImportNow("unscopables_symbol");
 
 utils.Import(function(from) {
   Delete = from.Delete;
-  MathMin = from.MathMin;
+  MinSimple = from.MinSimple;
   ObjectHasOwnProperty = from.ObjectHasOwnProperty;
   ObjectIsFrozen = from.ObjectIsFrozen;
   ObjectIsSealed = from.ObjectIsSealed;
@@ -271,7 +271,7 @@ function SparseMove(array, start_i, del_count, len, num_additional_args) {
   // Move data to new array.
   var new_array = new InternalArray(
       // Clamp array length to 2^32-1 to avoid early RangeError.
-      MathMin(len - del_count + num_additional_args, 0xffffffff));
+      MinSimple(len - del_count + num_additional_args, 0xffffffff));
   var big_indices;
   var indices = %GetArrayKeys(array, len);
   if (IS_NUMBER(indices)) {

src/js/arraybuffer.js

@@ -13,14 +13,14 @@
 
 var GlobalArrayBuffer = global.ArrayBuffer;
 var GlobalObject = global.Object;
-var MathMax;
+var MaxSimple;
-var MathMin;
+var MinSimple;
 var ToPositiveInteger;
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
 utils.Import(function(from) {
-  MathMax = from.MathMax;
+  MaxSimple = from.MaxSimple;
-  MathMin = from.MathMin;
+  MinSimple = from.MinSimple;
   ToPositiveInteger = from.ToPositiveInteger;
 });
 
@@ -57,16 +57,16 @@ function ArrayBufferSlice(start, end) {
   var first;
   var byte_length = %_ArrayBufferGetByteLength(this);
   if (relativeStart < 0) {
-    first = MathMax(byte_length + relativeStart, 0);
+    first = MaxSimple(byte_length + relativeStart, 0);
   } else {
-    first = MathMin(relativeStart, byte_length);
+    first = MinSimple(relativeStart, byte_length);
   }
   var relativeEnd = IS_UNDEFINED(end) ? byte_length : end;
   var fin;
   if (relativeEnd < 0) {
-    fin = MathMax(byte_length + relativeEnd, 0);
+    fin = MaxSimple(byte_length + relativeEnd, 0);
   } else {
-    fin = MathMin(relativeEnd, byte_length);
+    fin = MinSimple(relativeEnd, byte_length);
   }
 
   if (fin < first) {

src/js/harmony-array.js

@@ -16,8 +16,8 @@ var GetIterator;
 var GetMethod;
 var GlobalArray = global.Array;
 var iteratorSymbol = utils.ImportNow("iterator_symbol");
-var MathMax;
+var MaxSimple;
-var MathMin;
+var MinSimple;
 var ObjectIsFrozen;
 var ObjectDefineProperty;
 
@@ -25,8 +25,8 @@ utils.Import(function(from) {
   FLAG_harmony_tolength = from.FLAG_harmony_tolength;
   GetIterator = from.GetIterator;
   GetMethod = from.GetMethod;
-  MathMax = from.MathMax;
+  MaxSimple = from.MaxSimple;
-  MathMin = from.MathMin;
+  MinSimple = from.MinSimple;
   ObjectIsFrozen = from.ObjectIsFrozen;
   ObjectDefineProperty = from.ObjectDefineProperty;
 });
@@ -37,28 +37,28 @@ function InnerArrayCopyWithin(target, start, end, array, length) {
   target = TO_INTEGER(target);
   var to;
   if (target < 0) {
-    to = MathMax(length + target, 0);
+    to = MaxSimple(length + target, 0);
   } else {
-    to = MathMin(target, length);
+    to = MinSimple(target, length);
   }
 
   start = TO_INTEGER(start);
   var from;
   if (start < 0) {
-    from = MathMax(length + start, 0);
+    from = MaxSimple(length + start, 0);
   } else {
-    from = MathMin(start, length);
+    from = MinSimple(start, length);
   }
 
   end = IS_UNDEFINED(end) ? length : TO_INTEGER(end);
   var final;
   if (end < 0) {
-    final = MathMax(length + end, 0);
+    final = MaxSimple(length + end, 0);
   } else {
-    final = MathMin(end, length);
+    final = MinSimple(end, length);
   }
 
-  var count = MathMin(final - from, length - to);
+  var count = MinSimple(final - from, length - to);
   var direction = 1;
   if (from < to && to < (from + count)) {
     direction = -1;

src/js/harmony-atomics.js

@@ -12,11 +12,11 @@
 // Imports
 
 var GlobalObject = global.Object;
-var MathMax;
+var MaxSimple;
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
 utils.Import(function(from) {
-  MathMax = from.MathMax;
+  MaxSimple = from.MaxSimple;
 });
 
 // -------------------------------------------------------------------
@@ -146,7 +146,7 @@ function AtomicsFutexWaitJS(ia, index, value, timeout) {
     if (NUMBER_IS_NAN(timeout)) {
       timeout = INFINITY;
     } else {
-      timeout = MathMax(0, timeout);
+      timeout = MaxSimple(0, timeout);
     }
   }
   return %AtomicsFutexWait(ia, index, value, timeout);
@@ -158,14 +158,14 @@ function AtomicsFutexWakeJS(ia, index, count) {
   if (index < 0 || index >= %_TypedArrayGetLength(ia)) {
     return UNDEFINED;
   }
-  count = MathMax(0, TO_INTEGER(count));
+  count = MaxSimple(0, TO_INTEGER(count));
   return %AtomicsFutexWake(ia, index, count);
 }
 
 function AtomicsFutexWakeOrRequeueJS(ia, index1, count, value, index2) {
   CheckSharedInteger32TypedArray(ia);
   index1 = TO_INTEGER(index1);
-  count = MathMax(0, TO_INTEGER(count));
+  count = MaxSimple(0, TO_INTEGER(count));
   value = TO_INT32(value);
   index2 = TO_INTEGER(index2);
   if (index1 < 0 || index1 >= %_TypedArrayGetLength(ia) ||

src/js/harmony-typedarray.js

@@ -48,8 +48,8 @@ var InnerArraySome;
 var InnerArraySort;
 var InnerArrayToLocaleString;
 var IsNaN;
-var MathMax;
+var MaxSimple;
-var MathMin;
+var MinSimple;
 var PackedArrayReverse;
 
 utils.Import(function(from) {
@@ -72,8 +72,8 @@ utils.Import(function(from) {
   InnerArraySort = from.InnerArraySort;
   InnerArrayToLocaleString = from.InnerArrayToLocaleString;
   IsNaN = from.IsNaN;
-  MathMax = from.MathMax;
+  MaxSimple = from.MaxSimple;
-  MathMin = from.MathMin;
+  MinSimple = from.MinSimple;
   PackedArrayReverse = from.PackedArrayReverse;
 });
 
@@ -319,9 +319,9 @@ function TypedArraySlice(start, end) {
 
   var k;
   if (relativeStart < 0) {
-    k = MathMax(len + relativeStart, 0);
+    k = MaxSimple(len + relativeStart, 0);
   } else {
-    k = MathMin(relativeStart, len);
+    k = MinSimple(relativeStart, len);
   }
 
   var relativeEnd;
@@ -333,12 +333,12 @@ function TypedArraySlice(start, end) {
 
   var final;
   if (relativeEnd < 0) {
-    final = MathMax(len + relativeEnd, 0);
+    final = MaxSimple(len + relativeEnd, 0);
   } else {
-    final = MathMin(relativeEnd, len);
+    final = MinSimple(relativeEnd, len);
   }
 
-  var count = MathMax(final - k, 0);
+  var count = MaxSimple(final - k, 0);
   var array = ConstructTypedArrayLike(this, count);
   // The code below is the 'then' branch; the 'else' branch species
   // a memcpy. Because V8 doesn't canonicalize NaN, the difference is

src/js/json.js

@@ -13,14 +13,14 @@
 
 var GlobalJSON = global.JSON;
 var InternalArray = utils.InternalArray;
-var MathMax;
+var MaxSimple;
-var MathMin;
+var MinSimple;
 var ObjectHasOwnProperty;
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
 utils.Import(function(from) {
-  MathMax = from.MathMax;
+  MaxSimple = from.MaxSimple;
-  MathMin = from.MathMin;
+  MinSimple = from.MinSimple;
   ObjectHasOwnProperty = from.ObjectHasOwnProperty;
 });
 
@@ -215,7 +215,7 @@ function JSONStringify(value, replacer, space) {
   }
   var gap;
   if (IS_NUMBER(space)) {
-    space = MathMax(0, MathMin(TO_INTEGER(space), 10));
+    space = MaxSimple(0, MinSimple(TO_INTEGER(space), 10));
     gap = %_SubString("          ", 0, space);
   } else if (IS_STRING(space)) {
     if (space.length > 10) {

src/js/macros.py

@@ -159,8 +159,6 @@ macro TO_NAME(arg) = (%_ToName(arg));
 macro JSON_NUMBER_TO_STRING(arg) = ((%_IsSmi(%IS_VAR(arg)) || arg - arg == 0) ? %_NumberToString(arg) : "null");
 macro HAS_OWN_PROPERTY(arg, index) = (%_CallFunction(arg, index, ObjectHasOwnProperty));
 macro HAS_INDEX(array, index, is_array) = ((is_array && %_HasFastPackedElements(%IS_VAR(array))) ? (index < array.length) : (index in array));
-macro MAX_SIMPLE(argA, argB) = (argA < argB ? argB : argA);
-macro MIN_SIMPLE(argA, argB) = (argA < argB ? argA : argB);
 
 # Private names.
 macro IS_PRIVATE(sym) = (%SymbolIsPrivate(sym));

src/js/prologue.js

@@ -186,6 +186,8 @@ function PostNatives(utils) {
     "MapIteratorNext",
     "MathMax",
     "MathMin",
+    "MaxSimple",
+    "MinSimple",
     "ObjectIsFrozen",
     "ObjectDefineProperty",
     "ObserveArrayMethods",

src/js/runtime.js

@@ -216,6 +216,20 @@ function ToPositiveInteger(x, rangeErrorIndex) {
   return i;
 }
 
+
+function MaxSimple(a, b) {
+  return a > b ? a : b;
+}
+
+
+function MinSimple(a, b) {
+  return a > b ? b : a;
+}
+
+
+%SetForceInlineFlag(MaxSimple);
+%SetForceInlineFlag(MinSimple);
+
 //----------------------------------------------------------------------------
 
 // NOTE: Setting the prototype for Array must take place as early as
@@ -229,9 +243,11 @@ function ToPositiveInteger(x, rangeErrorIndex) {
 // Exports
 
 utils.Export(function(to) {
-  to.ToPositiveInteger = ToPositiveInteger;
+  to.MaxSimple = MaxSimple;
+  to.MinSimple = MinSimple;
   to.SameValue = SameValue;
   to.SameValueZero = SameValueZero;
+  to.ToPositiveInteger = ToPositiveInteger;
 });
 
 %InstallToContext([

src/js/typedarray.js

@@ -18,6 +18,8 @@ var GlobalDataView = global.DataView;
 var GlobalObject = global.Object;
 var InternalArray = utils.InternalArray;
 var iteratorSymbol = utils.ImportNow("iterator_symbol");
+var MaxSimple;
+var MinSimple;
 var ToPositiveInteger;
 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
 
@@ -42,6 +44,8 @@ TYPED_ARRAYS(DECLARE_GLOBALS)
 
 utils.Import(function(from) {
   ArrayValues = from.ArrayValues;
+  MaxSimple = from.MaxSimple;
+  MinSimple = from.MinSimple;
   ToPositiveInteger = from.ToPositiveInteger;
 });
 
@@ -213,15 +217,15 @@ function NAMESubArray(begin, end) {
   }
 
   if (beginInt < 0) {
-    beginInt = MAX_SIMPLE(0, srcLength + beginInt);
+    beginInt = MaxSimple(0, srcLength + beginInt);
   } else {
-    beginInt = MIN_SIMPLE(beginInt, srcLength);
+    beginInt = MinSimple(beginInt, srcLength);
   }
 
   if (endInt < 0) {
-    endInt = MAX_SIMPLE(0, srcLength + endInt);
+    endInt = MaxSimple(0, srcLength + endInt);
   } else {
-    endInt = MIN_SIMPLE(endInt, srcLength);
+    endInt = MinSimple(endInt, srcLength);
   }
 
   if (endInt < beginInt) {

test/mjsunit/minmax-simple.js

@@ -0,0 +1,27 @@
+// Copyright 2015 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.
+
+// Flags: --expose-natives-as natives
+// Test the MaxSimple and MinSimple internal methods in runtime.js
+
+var MaxSimple = natives.ImportNow("MaxSimple");
+var MinSimple = natives.ImportNow("MinSimple");
+
+function checkEvaluations(target) {
+  var evaluations = 0;
+  var observedNumber = {
+    valueOf: function() {
+      evaluations++;
+      return 0;
+    }
+  };
+  target(observedNumber, observedNumber);
+  return evaluations;
+}
+
+assertEquals(1, MaxSimple(-1, 1));
+assertEquals(2, checkEvaluations(MaxSimple));
+
+assertEquals(-1, MinSimple(-1, 1));
+assertEquals(2, checkEvaluations(MinSimple));