Fast elements conversions in crankshaft using generated code.

test/mjsunit/elements-transition.js

 // Copyright 2011 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 19 matching lines @@
 support_smi_only_arrays = %HasFastSmiOnlyElements([]);
 
 if (support_smi_only_arrays) {
   function test(test_double, test_object, set, length) {
     // We apply the same operations to two identical arrays.  The first array
     // triggers an IC miss, upon which the conversion stub is generated, but the
     // actual conversion is done in runtime.  The second array, arriving at
     // the previously patched IC, is then converted using the conversion stub.
     var array_1 = new Array(length);
     var array_2 = new Array(length);
+    
+    print("smi->double [" + test_double +

[Jakob Kummerow, 2011/10/19 18:36:31]

Unintentional debugging leftover?

+        "]\tsmi->object [" + (test_object && !test_double) +
+        "]\tdouble->object [" + (test_object && test_double) +
+        "]\tlength " + length);
 
     assertTrue(%HasFastSmiOnlyElements(array_1));
     assertTrue(%HasFastSmiOnlyElements(array_2));
     for (var i = 0; i < length; i++) {
       if (i == length - 5 && test_double) {
         // Trigger conversion to fast double elements at length-5.
         set(array_1, i, 0.5);
         set(array_2, i, 0.5);
         assertTrue(%HasFastDoubleElements(array_1));
         assertTrue(%HasFastDoubleElements(array_2));
@@ skipping 35 matching lines @@
   test(false, true,  function(a,i,v){ a[i] = v; }, 20);
   test(true,  true,  function(a,i,v){ a[i] = v; }, 20);
 
   test(false, false, function(a,i,v){ a[i] = v; }, 10000);
   test(true,  false, function(a,i,v){ a[i] = v; }, 10000);
   test(false, true,  function(a,i,v){ a[i] = v; }, 10000);
   test(true,  true,  function(a,i,v){ a[i] = v; }, 10000);
 } else {
   print("Test skipped because smi only arrays are not supported.");
 }