Builtin function EQULAS partially rewritten in C++. Control branches that cal...

src/runtime.js

Index: src/runtime.js
===================================================================
--- src/runtime.js	(revision 4001)
+++ src/runtime.js	(working copy)
@@ -52,43 +52,28 @@
 
 // ECMA-262, section 11.9.1, page 55.
 function EQUALS(y) {
-  if (IS_STRING(this) && IS_STRING(y)) return %StringEquals(this, y);
+  var r = %FastEquals(this, y);
+  if (r <= 1) return r;
   var x = this;
 
   // NOTE: We use iteration instead of recursion, because it is
   // difficult to call EQUALS with the correct setting of 'this' in
   // an efficient way.
   while (true) {
-    if (IS_NUMBER(x)) {
-      if (y == null) return 1;  // not equal
-      return %NumberEquals(x, %ToNumber(y));
-    } else if (IS_STRING(x)) {
-      if (IS_STRING(y)) return %StringEquals(x, y);
-      if (IS_NUMBER(y)) return %NumberEquals(%ToNumber(x), y);
-      if (IS_BOOLEAN(y)) return %NumberEquals(%ToNumber(x), %ToNumber(y));
-      if (y == null) return 1;  // not equal
+    if (r == EQUALS_SECOND_ARG_TO_DEFAULT_VALUE) {
+      x = %ToNumber(x);
+      y = %ToNumber(%DefaultNumber(y));
+      return %NumberEquals(x, y);
+    } else if (r == EQUALS_SECOND_ARG_TO_PRIMITIVE) {
       y = %ToPrimitive(y, NO_HINT);
-    } else if (IS_BOOLEAN(x)) {
-      if (IS_BOOLEAN(y)) {
-        return %_ObjectEquals(x, y) ? 0 : 1;
-      }
-      if (y == null) return 1;  // not equal
-      return %NumberEquals(%ToNumber(x), %ToNumber(y));
-    } else if (x == null) {
-      // NOTE: This checks for both null and undefined.
-      return (y == null) ? 0 : 1;
-    } else {
-      // x is not a number, boolean, null or undefined.
-      if (y == null) return 1;  // not equal
-      if (IS_OBJECT(y)) {
-        return %_ObjectEquals(x, y) ? 0 : 1;
-      }
-      if (IS_FUNCTION(y)) {
-        return %_ObjectEquals(x, y) ? 0 : 1;
-      }
-
+      // retry
+    } else if (r == EQUALS_FIRST_ARG_TO_PRIMITIVE) {
       x = %ToPrimitive(x, NO_HINT);
+      // retry
     }
+
+    var r = %FastEquals(x, y);
+    if (r <= 1) return r;
   }
 }