Rollback trunk to 3.21.16.2

test/mjsunit/compiler/load-elimination.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 --load-elimination
-
-// Test local load elimination of redundant loads and stores.
-
-function B(x, y) {
-  this.x = x;
-  this.y = y;
-  return this;
-}
-
-function test_load() {
-  var a = new B(1, 2);
-  return a.x + a.x + a.x + a.x;
-}
-
-function test_store_load() {
-  var a = new B(1, 2);
-  a.x = 4;
-  var f = a.x;
-  a.x = 5;
-  var g = a.x;
-  a.x = 6;
-  var h = a.x;
-  a.x = 7;
-  return f + g + h + a.x;
-}
-
-function test_nonaliasing_store1() {
-  var a = new B(2, 3), b = new B(3, 4);
-  b.x = 4;
-  var f = a.x;
-  b.x = 5;
-  var g = a.x;
-  b.x = 6;
-  var h = a.x;
-  b.x = 7;
-  return f + g + h + a.x;
-}
-
-function killall() {
-  try { } catch(e) { }
-}
-
-%NeverOptimizeFunction(killall);
-
-function test_store_load_kill() {
-  var a = new B(1, 2);
-  a.x = 4;
-  var f = a.x;
-  a.x = 5;
-  var g = a.x;
-  killall();
-  a.x = 6;
-  var h = a.x;
-  a.x = 7;
-  return f + g + h + a.x;
-}
-
-function test_store_store() {
-  var a = new B(6, 7);
-  a.x = 7;
-  a.x = 7;
-  a.x = 7;
-  a.x = 7;
-  return a.x;
-}
-
-function test(x, f) {
-  assertEquals(x, f());
-  assertEquals(x, f());
-  %OptimizeFunctionOnNextCall(f);
-  assertEquals(x, f());
-}
-
-test(4, test_load);
-test(22, test_store_load);
-test(8, test_nonaliasing_store1);
-test(22, test_store_load_kill);
-test(7, test_store_store);