Elide hole checks on KeyedLoads of holey double arrays.

test/mjsunit/elide-double-hole-check-1.js

-// Copyright 2012 the V8 project authors. All rights reserved.
+// Copyright 2013 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
 //       with the distribution.
 //     * Neither the name of Google Inc. nor the names of its
 //       contributors may be used to endorse or promote products derived
 //       from this software without specific prior written permission.
 //
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
 
-function worker1(ignored) {
-  return 100;
+function f1(a, i) {
+  return a[i]
 }
 
-function factory(worker) {
-  return function(call_depth) {
-    if (call_depth == 0) return 10;
-    return 1 + worker(call_depth - 1);
-  }
+var a1 = [,,,,,,,,,,,,,,,,,,0.5];
+assertEquals(undefined, f1(a1, 1));
+assertEquals(undefined, f1(a1, 1));
+%OptimizeFunctionOnNextCall(f1);
+assertEquals(undefined, f1(a1, 1));
+assertEquals(undefined, f1(a1, 1));
+
+function f2(a, i) {
+  return a[i] + 0.5;
 }
-
-var f1 = factory(worker1);
-var f2 = factory(f1);
-assertEquals(11, f2(1));
-%OptimizeFunctionOnNextCall(f1);
-assertEquals(10, f1(0));
+var a2_b = [0.0,,];
+assertEquals(0.5, f2(a2_b, 0));
+assertEquals(0.5, f2(a2_b, 0));
 %OptimizeFunctionOnNextCall(f2);
-assertEquals(102, f2(2));
-assertEquals(102, f2(2));
+assertEquals(0.5, f2(a2_b, 0));
+assertEquals(NaN, f2(a2_b, 1));
+a2_b.__proto__ = [1.5,1.5,1.5];
+assertEquals(2, f2(a2_b, 1));
+assertEquals(0.5, f2(a2_b, 0));