[runtime] Unify and fix the strict equality comparison.

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 109 matching lines @@
       if (IS_NULL_OR_UNDEFINED(y)) return 1;
       if (IS_NUMBER(y)) return %NumberEquals(%$toNumber(x), y);
       if (IS_STRING(y)) return %NumberEquals(%$toNumber(x), %$toNumber(y));
       if (IS_SYMBOL(y) || IS_SIMD_VALUE(y)) return 1;  // not equal
       // y is object.
       x = %$toNumber(x);
       y = %$toPrimitive(y, NO_HINT);
     } else if (IS_NULL_OR_UNDEFINED(x)) {
       return IS_NULL_OR_UNDEFINED(y) ? 0 : 1;
     } else if (IS_SIMD_VALUE(x)) {
+      if (!IS_SIMD_VALUE(y)) return 1;  // not equal
        return %SimdEquals(x, y);
     } else {
       // x is an object.
       if (IS_SPEC_OBJECT(y)) return %_ObjectEquals(x, y) ? 0 : 1;
       if (IS_NULL_OR_UNDEFINED(y)) return 1;  // not equal
       if (IS_BOOLEAN(y)) {
         y = %$toNumber(y);
       } else if (IS_SYMBOL(y) || IS_SIMD_VALUE(y)) {
         return 1;  // not equal
       }
       x = %$toPrimitive(x, NO_HINT);
     }
   }
 }
 
-// ECMA-262, section 11.9.4, page 56.
-STRICT_EQUALS = function STRICT_EQUALS(x) {
-  if (IS_STRING(this)) {
-    if (!IS_STRING(x)) return 1;  // not equal
-    return %StringEquals(this, x);
-  }
-
-  if (IS_NUMBER(this)) {
-    if (!IS_NUMBER(x)) return 1;  // not equal
-    return %NumberEquals(this, x);
-  }
-
-  if (IS_SIMD_VALUE(this)) return %SimdEquals(this, x);
-
-  // If anything else gets here, we just do simple identity check.
-  // Objects (including functions), null, undefined and booleans were
-  // checked in the CompareStub, so there should be nothing left.
-  return %_ObjectEquals(this, x) ? 0 : 1;
-}
-
 
 // ECMA-262, section 11.8.5, page 53. The 'ncr' parameter is used as
 // the result when either (or both) the operands are NaN.
 COMPARE = function COMPARE(x, ncr) {
   var left;
   var right;
   // Fast cases for string, numbers and undefined compares.
   if (IS_STRING(this)) {
     if (IS_STRING(x)) return %_StringCompare(this, x);
     if (IS_UNDEFINED(x)) return ncr;
@@ skipping 753 matching lines @@
 $toBoolean = ToBoolean;
 $toInteger = ToInteger;
 $toLength = ToLength;
 $toName = ToName;
 $toNumber = ToNumber;
 $toPositiveInteger = ToPositiveInteger;
 $toPrimitive = ToPrimitive;
 $toString = ToString;
 
 })