mirror of https://github.com/lukechilds/node.git
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
75 lines
3.4 KiB
75 lines
3.4 KiB
// 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.
|
|
|
|
// Ensure that we can correctly change the sign of the most negative smi.
|
|
|
|
// Possible Smi ranges.
|
|
var ranges = [{min: -1073741824, max: 1073741823, bits: 31},
|
|
{min: -2147483648, max: 2147483647, bits: 32}];
|
|
|
|
for (var i = 0; i < ranges.length; i++) {
|
|
var range = ranges[i];
|
|
var min_smi = range.min;
|
|
var max_smi = range.max;
|
|
var bits = range.bits;
|
|
var name = bits + "-bit";
|
|
|
|
var result = max_smi + 1;
|
|
|
|
// Min smi as literal
|
|
assertEquals(result, eval(min_smi + " * -1"), name + "-litconmult");
|
|
assertEquals(result, eval(min_smi + " / -1"), name + "-litcondiv");
|
|
assertEquals(result, eval("-(" + min_smi + ")"), name + "-litneg");
|
|
assertEquals(result, eval("0 - (" + min_smi + ")")), name + "-conlitsub";
|
|
|
|
// As variable:
|
|
assertEquals(result, min_smi * -1, name + "-varconmult");
|
|
assertEquals(result, min_smi / -1, name + "-varcondiv");
|
|
assertEquals(result, -min_smi, name + "-varneg");
|
|
assertEquals(result, 0 - min_smi, name + "-convarsub");
|
|
|
|
// Only variables:
|
|
var zero = 0;
|
|
var minus_one = -1;
|
|
|
|
assertEquals(result, min_smi * minus_one, name + "-varvarmult");
|
|
assertEquals(result, min_smi / minus_one, name + "-varvardiv");
|
|
assertEquals(result, zero - min_smi, name + "-varvarsub");
|
|
|
|
// Constants as variables
|
|
assertEquals(result, eval(min_smi + " * minus_one"), name + "-litvarmult");
|
|
assertEquals(result, eval(min_smi + " / minus_one"), name + "-litvarmdiv");
|
|
assertEquals(result, eval("0 - (" + min_smi + ")"), name + "-varlitsub");
|
|
|
|
var half_min_smi = -(1 << (bits >> 1));
|
|
var half_max_smi = 1 << ((bits - 1) >> 1);
|
|
|
|
assertEquals(max_smi + 1, -half_min_smi * half_max_smi, name + "-half1");
|
|
assertEquals(max_smi + 1, half_min_smi * -half_max_smi, name + "-half2");
|
|
assertEquals(max_smi + 1, half_max_smi * -half_min_smi, name + "-half3");
|
|
assertEquals(max_smi + 1, -half_max_smi * half_min_smi, name + "-half4");
|
|
}
|
|
|