Performance improvement for Math.max and Math.min...

src/math.js

Index: src/math.js
===================================================================
--- src/math.js	(revision 3431)
+++ src/math.js	(working copy)
@@ -128,8 +128,9 @@
     var n = %_Arguments(i);
     if (!IS_NUMBER(n)) n = ToNumber(n);
     if (NUMBER_IS_NAN(n)) return n;
-    // Make sure +0 is considered greater than -0.
-    if (n > r || (r === 0 && n === 0 && !%_IsSmi(r))) r = n;
+    // Make sure +0 is considered greater than -0.  -0 is never a Smi, +0 can be
+    // a Smi or heap number.
+    if (n > r || (r === 0 && n === 0 && !%_IsSmi(r) && 1 / r < 0)) r = n;
   }
   return r;
 }
@@ -147,8 +148,9 @@
     var n = %_Arguments(i);
     if (!IS_NUMBER(n)) n = ToNumber(n);
     if (NUMBER_IS_NAN(n)) return n;
-    // Make sure -0 is considered less than +0.
-    if (n < r || (r === 0 && n === 0 && !%_IsSmi(n))) r = n;
+    // Make sure -0 is considered less than +0.  -0 is never a Smi, +0 can b a
+    // Smi or a heap number.
+    if (n < r || (r === 0 && n === 0 && !%_IsSmi(n) && 1 / n < 0)) r = n;
   }
   return r;
 }