v8/test/mjsunit/compiler/load-elimination.js

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// 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);