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

197 lines
4.1 KiB
JavaScript

// 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 global load elimination of redundant loads and stores.
var X = true; // For forcing branches.
X = false;
X = true;
X = false;
function B(x, y) {
this.x = x;
this.y = y;
return this;
}
function test_load() {
var a = new B(1, 2);
var f = a.x + a.x;
if (false) ;
return f + a.x + a.x;
}
function test_load2() {
var a = new B(1, 2);
var f = a.x + a.x;
if (true) ;
return f + a.x + a.x;
}
function test_store_load() {
var a = new B(1, 2);
a.x = 4;
var b = X ? a.x : a.x;
return b + a.x;
}
function test_store_load2() {
var a = new B(1, 2);
var c = 6;
if (X) a.x = c;
else a.x = c;
return a.x + a.x;
}
function test_nonaliasing_store1() {
var a = new B(2, 3), b = new B(3, 4);
if (X) ;
b.x = 4;
if (X) ;
var f = a.x;
if (X) ;
b.x = 5;
if (X) ;
var g = a.x;
if (X) ;
b.x = 6;
if (X) ;
var h = a.x;
if (X) ;
b.x = 7;
if (X) ;
return f + g + h + a.x;
}
function test_loop(x) {
var a = new B(2, 3);
var v = a.x;
var total = v;
var i = 0;
while (i++ < 10) {
total = a.x;
a.y = 4;
}
return total;
}
function test_loop2(x) {
var a = new B(2, 3);
var v = a.x;
var total = v;
var i = 0;
while (i++ < 10) {
total = a.x; // a.x not affected by loop
a.y = 4;
var j = 0;
while (j++ < 10) {
total = a.x; // a.x not affected by loop
a.y = 5;
}
total = a.x;
a.y = 6;
j = 0;
while (j++ < 10) {
total = a.x; // a.x not affected by loop
a.y = 7;
}
}
return total;
}
function killall() {
try { } catch(e) { }
}
%NeverOptimizeFunction(killall);
function test_store_load_kill() {
var a = new B(1, 2);
if (X) ;
a.x = 4;
if (X) ;
var f = a.x;
if (X) ;
a.x = 5;
if (X) ;
var g = a.x;
if (X) ;
killall();
if (X) ;
a.x = 6;
if (X) ;
var h = a.x;
if (X) ;
a.x = 7;
if (X) ;
return f + g + h + a.x;
}
function test_store_store() {
var a = new B(6, 7);
if (X) ;
a.x = 7;
if (X) ;
a.x = 7;
if (X) ;
a.x = 7;
if (X) ;
a.x = 7;
if (X) ;
return a.x;
}
function test(x, f) {
X = true;
assertEquals(x, f());
assertEquals(x, f());
X = false;
assertEquals(x, f());
assertEquals(x, f());
X = true;
%OptimizeFunctionOnNextCall(f);
assertEquals(x, f());
assertEquals(x, f());
X = false;
assertEquals(x, f());
assertEquals(x, f());
}
test(4, test_load);
test(8, test_store_load);
test(12, test_store_load2);
test(8, test_nonaliasing_store1);
test(22, test_store_load_kill);
test(7, test_store_store);
test(2, test_loop);
test(2, test_loop2);