Elements kind conversion in generated code (ia32).

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:
+//
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+//     * Redistributions in binary form must reproduce the above
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+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+// Flags: --allow-natives-syntax --smi-only-arrays
+
+function test(test_double, test_object, set) {
+  var length = 10000;
+  var you = new Array(length);
+  var me = new Array(length);

[Jakob Kummerow, 2011/10/13 09:15:59]

As discussed, please add a comment explaining why every operation here needs to
be performed for two identical arrays.

+
+  assertTrue(%HasFastSmiOnlyElements(you));
+  assertTrue(%HasFastSmiOnlyElements(me));
+  for (var i = 0; i < length; i++) {
+    if (i == (length*0.7 | 0) && test_double) {
+      set(you, i, 0.5);
+      set(me, i, 0.5);
+      assertTrue(%HasFastDoubleElements(you));
+      assertTrue(%HasFastDoubleElements(me));
+    } else if (i == (length*0.8 | 0) && test_object) {
+      set(you, i, 'object');
+      set(me, i, 'object');
+      assertTrue(%HasFastElements(you));
+      assertTrue(%HasFastElements(me));
+    } else {
+      set(you, i, 2*i);
+      set(me, i, 2*i);
+    }
+  }
+
+  for (var i = 0; i < length; i++) {
+    if (i == (length*0.7 | 0) && test_double) {
+      assertEquals(0.5, you[i]);
+      assertEquals(0.5, me[i]);
+    } else if (i == (length*0.8 | 0) && test_object) {
+      assertEquals('object', you[i]);
+      assertEquals('object', me[i]);
+    } else {
+      assertEquals(2*i, me[i]);
+      assertEquals(2*i, you[i]);
+    }
+  }
+}
+
+test(false, false, function(a,i,v){ a[i] = v; });
+test(true,  false, function(a,i,v){ a[i] = v; });
+test(false, true,  function(a,i,v){ a[i] = v; });
+test(true,  true,  function(a,i,v){ a[i] = v; });