74 lines
2.4 KiB
JavaScript
74 lines
2.4 KiB
JavaScript
|
// Copyright 2008 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
|
||
|
|
// Test some dead code elimination scenarios
|
||
|
|
|
||
|
|
function dead1(x, y) {
|
||
|
|
var a = x | 0, b = y | 0;
|
||
|
|
a * b;
|
||
|
|
a << b;
|
||
|
|
a >> b;
|
||
|
|
a >>> b;
|
||
|
|
a | b;
|
||
|
|
a & b;
|
||
|
|
a ^ b;
|
||
|
|
return x;
|
||
|
|
}
|
||
|
|
|
||
|
|
function dead2(x, y) {
|
||
|
|
var a = x | 0, b = y | 0;
|
||
|
|
(a | 0) * b;
|
||
|
|
(a | 0) << b;
|
||
|
|
(a | 0) >> b;
|
||
|
|
(a | 0) >>> b;
|
||
|
|
(a | 0) | b;
|
||
|
|
(a | 0) & b;
|
||
|
|
(a | 0) ^ b;
|
||
|
|
return x;
|
||
|
|
}
|
||
|
|
|
||
|
|
function dead3(a, b) {
|
||
|
|
a == 2 ? (a * b) : (b * a); // dead
|
||
|
|
return a;
|
||
|
|
}
|
||
|
|
|
||
|
|
assertTrue(dead1(33, 32) == 33);
|
||
|
|
assertTrue(dead1(33, 32) == 33);
|
||
|
|
%OptimizeFunctionOnNextCall(dead1);
|
||
|
|
assertTrue(dead1(33, 32) == 33);
|
||
|
|
|
||
|
|
assertTrue(dead2(34, 11) == 34);
|
||
|
|
assertTrue(dead2(34, 11) == 34);
|
||
|
|
%OptimizeFunctionOnNextCall(dead2);
|
||
|
|
assertTrue(dead2(34, 11) == 34);
|
||
|
|
|
||
|
|
assertTrue(dead3(35, 12) == 35);
|
||
|
|
assertTrue(dead3(35, 12) == 35);
|
||
|
|
%OptimizeFunctionOnNextCall(dead3);
|
||
|
|
assertTrue(dead3(35, 12) == 35);
|