Lattice-based representation inference, powered by left/right specific type feedback for BinaryOps …

src/date.js

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 89 matching lines @@
   year = TO_INTEGER_MAP_MINUS_ZERO(year);
   month = TO_INTEGER_MAP_MINUS_ZERO(month);
   date = TO_INTEGER_MAP_MINUS_ZERO(date);
 
   if (year < kMinYear || year > kMaxYear ||
       month < kMinMonth || month > kMaxMonth) {
     return $NaN;
   }
 
   // Now we rely on year and month being SMIs.
-  return %DateMakeDay(year, month) + date - 1;
+  return %DateMakeDay(year | 0, month | 0) + date - 1;
 }
 
 
 // ECMA 262 - 15.9.1.13
 function MakeDate(day, time) {
   var time = day * msPerDay + time;
   // Some of our runtime funtions for computing UTC(time) rely on
   // times not being significantly larger than MAX_TIME_MS. If there
   // is no way that the time can be within range even after UTC
   // conversion we return NaN immediately instead of relying on
@@ skipping 702 matching lines @@
     "toGMTString", DateToGMTString,
     "toUTCString", DateToUTCString,
     "getYear", DateGetYear,
     "setYear", DateSetYear,
     "toISOString", DateToISOString,
     "toJSON", DateToJSON
   ));
 }
 
 SetUpDate();