Merged r16139 into trunk branch.

test/mjsunit/regress/regress-hoist-load-named-field.js

 // 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,
 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 // Flags: --allow-natives-syntax
 
-function f(i, b) {
-  var a = 0;
-  if (b) {
-    var c = 1 << i;
-    a = c + c;
+// Load fields should not be hoisted beyond their check maps when the check maps
+// cannot be hoisted due to changes in elements kinds.
+function f(o, a) {
+  var v;
+  var i = 1;
+  while (i < 2) {
+    v = o.y;
+    a[0] = 1.5;
+    i++;
   }
-  var x = a >> 3;
-  return a;
+  return v;
 }
 
-f(1, false);
-f(1, true);
+f({y:1.4}, [1]);
+f({y:1.6}, [1]);
 %OptimizeFunctionOnNextCall(f);
-assertEquals((1 << 30) * 2, f(30, true));
+f({x:1}, [1]);
 
-
-var global = 1;
-
-function f2(b) {
-  var a = 0;
-  if (b) {
-    a = global;
+// Polymorphic loads should not be hoisted beyond their compare maps.
+function f2(o) {
+  var i = 0;
+  var v;
+  while (i < 1) {
+    v = o.x;
+    i++;
   }
-  var x = a >> 3;
-  return a;
+  return v;
 }
 
-f2(false);
-f2(true);
+var o1 = { x: 1.5 };
+var o2 = { y: 1, x: 1 };
+
+f2(o1);
+f2(o1);
+f2(o2);
 %OptimizeFunctionOnNextCall(f2);
-global = 2.5;
-assertEquals(global, f2(true));
+f2(o2);