v8/test/mjsunit/compiler/division-by-constant.js
svenpanne@chromium.org be328fd4ce Disable special handling of flooring division by constant until it is fixed for real.
Added a test to check the various division-like operations more exhaustively.

R=bmeurer@chromium.org, ulan@chromium.org

Review URL: https://codereview.chromium.org/194863002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19852 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2014-03-12 14:28:59 +00:00

132 lines
4.6 KiB
JavaScript

// Copyright 2014 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 --no-use-inlining
// -----------------------------------------------------------------------------
function ConstructDiv(divisor) {
return "return ((dividend | 0) / ((" + divisor + ") | 0)) | 0";
}
var RefDivByConstI =
new Function("dividend", "divisor", ConstructDiv("divisor"));
%NeverOptimizeFunction(RefDivByConstI);
// -----------------------------------------------------------------------------
function ConstructMod(divisor) {
return "return ((dividend | 0) % ((" + divisor + ") | 0)) | 0";
}
var RefModByConstI =
new Function("dividend", "divisor", ConstructMod("divisor"));
%NeverOptimizeFunction(RefModByConstI);
// -----------------------------------------------------------------------------
function ConstructFlooringDiv(divisor) {
return "return Math.floor(dividend / (" + divisor + ")) | 0";
}
var RefFlooringDivByConstI =
new Function("dividend", "divisor", ConstructFlooringDiv("divisor"));
%NeverOptimizeFunction(RefFlooringDivByConstI);
// -----------------------------------------------------------------------------
function PushSymmetric(values, x) {
values.push(x, -x);
}
function PushRangeSymmetric(values, from, to) {
for (var x = from; x <= to; x++) {
PushSymmetric(values, x);
}
}
function CreateTestValues() {
var values = [
// -(2^31)
-2147483648,
// Some values from "Hacker's Delight", chapter 10-7.
715827883, 1431655766, -1431655765, -1431655764,
// Some "randomly" chosen numbers.
123, -1234, 12345, -123456, 1234567, -12345678, 123456789
];
// Powers of 2
for (var shift = 6; shift < 31; shift++) {
PushSymmetric(values, 1 << shift);
}
// Values near zero
PushRangeSymmetric(values, 1, 32);
// Various magnitudes
PushRangeSymmetric(values, 100, 109);
PushRangeSymmetric(values, 1000, 1009);
PushRangeSymmetric(values, 10000, 10009);
PushRangeSymmetric(values, 100000, 100009);
PushRangeSymmetric(values, 1000000, 1000009);
PushRangeSymmetric(values, 10000000, 10000009);
PushRangeSymmetric(values, 100000000, 100000009);
PushRangeSymmetric(values, 1000000000, 1000000009);
return values;
}
// -----------------------------------------------------------------------------
function TestDivisionLike(ref, construct, values, divisor) {
// Define the function to test.
var OptFun = new Function("dividend", construct(divisor));
// Warm up type feedback.
OptFun(7);
OptFun(11);
%OptimizeFunctionOnNextCall(OptFun);
OptFun(13);
// Check results.
values.forEach(function(dividend) {
// Avoid deopt caused by overflow, we do not want to test this here.
if (dividend === -2147483648 && divisor === -1) return;
assertEquals(ref(dividend, divisor), OptFun(dividend));
});
}
function Test(ref, construct) {
var values = CreateTestValues();
values.forEach(function(divisor) {
TestDivisionLike(ref, construct, values, divisor);
});
}
Test(RefDivByConstI, ConstructDiv);
Test(RefModByConstI, ConstructMod);
Test(RefFlooringDivByConstI, ConstructFlooringDiv);