v8/test/mjsunit/math-min-max.js

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// 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 Math.min().
assertEquals(Infinity, Math.min());
assertEquals(1, Math.min(1));
assertEquals(1, Math.min(1, 2));
assertEquals(1, Math.min(2, 1));
assertEquals(1, Math.min(1, 2, 3));
assertEquals(1, Math.min(3, 2, 1));
assertEquals(1, Math.min(2, 3, 1));
assertEquals(1.1, Math.min(1.1, 2.2, 3.3));
assertEquals(1.1, Math.min(3.3, 2.2, 1.1));
assertEquals(1.1, Math.min(2.2, 3.3, 1.1));
// Prepare a non-Smi zero value.
function returnsNonSmi(){ return 0.25; }
var ZERO = (function() {
var z;
// We have to have a loop here because the first time we get a Smi from the
// runtime system. After a while the binary op IC settles down and we get
// a non-Smi from the generated code.
for (var i = 0; i < 10; i++) {
z = returnsNonSmi() - returnsNonSmi();
}
return z;
})();
assertEquals(0, ZERO);
assertEquals(Infinity, 1/ZERO);
assertEquals(-Infinity, 1/-ZERO);
// Here we would like to have assertFalse(%_IsSmi(ZERO)); This is, however,
// unreliable, since a new space exhaustion at a critical moment could send
// us into the runtime system, which would quite legitimately put a Smi zero
// here.
assertFalse(%_IsSmi(-ZERO));
var o = {};
o.valueOf = function() { return 1; };
assertEquals(1, Math.min(2, 3, '1'));
assertEquals(1, Math.min(3, o, 2));
assertEquals(1, Math.min(o, 2));
assertEquals(-Infinity, Infinity / Math.min(-0, +0));
assertEquals(-Infinity, Infinity / Math.min(+0, -0));
assertEquals(-Infinity, Infinity / Math.min(+0, -0, 1));
assertEquals(-Infinity, Infinity / Math.min(-0, ZERO));
assertEquals(-Infinity, Infinity / Math.min(ZERO, -0));
assertEquals(-Infinity, Infinity / Math.min(ZERO, -0, 1));
assertEquals(-1, Math.min(+0, -0, -1));
assertEquals(-1, Math.min(-1, +0, -0));
assertEquals(-1, Math.min(+0, -1, -0));
assertEquals(-1, Math.min(-0, -1, +0));
assertEquals(NaN, Math.min('oxen'));
assertEquals(NaN, Math.min('oxen', 1));
assertEquals(NaN, Math.min(1, 'oxen'));
// Test Math.max().
assertEquals(Number.NEGATIVE_INFINITY, Math.max());
assertEquals(1, Math.max(1));
assertEquals(2, Math.max(1, 2));
assertEquals(2, Math.max(2, 1));
assertEquals(3, Math.max(1, 2, 3));
assertEquals(3, Math.max(3, 2, 1));
assertEquals(3, Math.max(2, 3, 1));
assertEquals(3.3, Math.max(1.1, 2.2, 3.3));
assertEquals(3.3, Math.max(3.3, 2.2, 1.1));
assertEquals(3.3, Math.max(2.2, 3.3, 1.1));
var o = {};
o.valueOf = function() { return 3; };
assertEquals(3, Math.max(2, '3', 1));
assertEquals(3, Math.max(1, o, 2));
assertEquals(3, Math.max(o, 1));
assertEquals(Infinity, Infinity / Math.max(-0, +0));
assertEquals(Infinity, Infinity / Math.max(+0, -0));
assertEquals(Infinity, Infinity / Math.max(+0, -0, -1));
assertEquals(Infinity, Infinity / Math.max(-0, ZERO));
assertEquals(Infinity, Infinity / Math.max(ZERO, -0));
assertEquals(Infinity, Infinity / Math.max(ZERO, -0, -1));
assertEquals(1, Math.max(+0, -0, +1));
assertEquals(1, Math.max(+1, +0, -0));
assertEquals(1, Math.max(+0, +1, -0));
assertEquals(1, Math.max(-0, +1, +0));
assertEquals(NaN, Math.max('oxen'));
assertEquals(NaN, Math.max('oxen', 1));
assertEquals(NaN, Math.max(1, 'oxen'));
assertEquals(Infinity, 1/Math.max(ZERO, -0));
assertEquals(Infinity, 1/Math.max(-0, ZERO));
function run(crankshaft_test) {
crankshaft_test(1);
crankshaft_test(1);
%OptimizeFunctionOnNextCall(crankshaft_test);
crankshaft_test(-0);
}
function crankshaft_test_1(arg) {
var v1 = 1;
var v2 = 5;
var v3 = 1.5;
var v4 = 5.5;
var v5 = 2;
var v6 = 6;
var v7 = 0;
var v8 = -0;
var v9 = 9.9;
var v0 = 10.1;
// Integer32 representation.
assertEquals(v2, Math.max(v1++, v2++));
assertEquals(v1, Math.min(v1++, v2++));
// Tagged representation.
assertEquals(v4, Math.max(v3, v4));
assertEquals(v3, Math.min(v3, v4));
assertEquals(v6, Math.max(v5, v6));
assertEquals(v5, Math.min(v5, v6));
// Double representation.
assertEquals(v0, Math.max(v0++, v9++));
assertEquals(v9, Math.min(v0++, v9++));
// Mixed representation.
assertEquals(v1, Math.min(v1++, v9++)); // int32, double
assertEquals(v0, Math.max(v0++, v2++)); // double, int32
assertEquals(v1, Math.min(v1++, v6)); // int32, tagged
assertEquals(v2, Math.max(v5, v2++)); // tagged, int32
assertEquals(v6, Math.min(v6, v9++)); // tagged, double
assertEquals(v0, Math.max(v0++, v5)); // double, tagged
// Minus zero.
assertEquals(Infinity, 1/Math.max(v7, v8));
assertEquals(-Infinity, 1/Math.min(v7, v8));
// NaN.
assertEquals(NaN, Math.max(NaN, v8));
assertEquals(NaN, Math.min(NaN, v9));
assertEquals(NaN, Math.max(v8, NaN));
assertEquals(NaN, Math.min(v9, NaN));
// Minus zero as Integer32.
assertEquals((arg === -0) ? -Infinity : 1, 1/Math.min(arg, v2));
}
run(crankshaft_test_1);
function crankshaft_test_2() {
var v9 = {};
v9.valueOf = function() { return 6; }
// Deopt expected due to non-heapnumber objects.
assertEquals(6, Math.min(v9, 12));
}
run(crankshaft_test_2);
var o = { a: 1, b: 2 };
// Test smi-based Math.min.
function f(o) {
return Math.min(o.a, o.b);
}
assertEquals(1, f(o));
assertEquals(1, f(o));
%OptimizeFunctionOnNextCall(f);
assertEquals(1, f(o));
o.a = 5;
o.b = 4;
assertEquals(4, f(o));
// Test overriding Math.min and Math.max
Math.min = function(a, b) { return a + b; }
Math.max = function(a, b) { return a - b; }
function crankshaft_test_3() {
assertEquals(8, Math.min(3, 5));
assertEquals(3, Math.max(5, 2));
}
run(crankshaft_test_3);