Javascript
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207行
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8.17 KB
// 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.
// TODO(3468): we rely on a precise Math.exp.
// Flags: --no-fast-math
[Math.sinh, Math.cosh, Math.tanh, Math.asinh, Math.acosh, Math.atanh].
forEach(function(fun) {
assertTrue(isNaN(fun(NaN)));
assertTrue(isNaN(fun("abc")));
assertTrue(isNaN(fun({})));
assertEquals(fun(0), fun([]));
assertTrue(isNaN(fun([1, 1])));
assertEquals(fun(1.11), fun({ toString: function() { return "1.11"; } }));
assertEquals(fun(-3.1), fun({ toString: function() { return -3.1; } }));
assertEquals(fun(-1.1), fun({ valueOf: function() { return "-1.1"; } }));
assertEquals(fun(3.11), fun({ valueOf: function() { return 3.11; } }));
});
function test_id(fun, rev, value) {
assertEqualsDelta(1, rev(fun(value))/value, 1E-7);
}
[Math.PI, 2, 5, 1E-5, 0.3].forEach(function(x) {
test_id(Math.sinh, Math.asinh, x);
test_id(Math.sinh, Math.asinh, -x);
test_id(Math.cosh, Math.acosh, x);
test_id(Math.tanh, Math.atanh, x);
test_id(Math.tanh, Math.atanh, -x);
});
[Math.sinh, Math.asinh, Math.tanh, Math.atanh].forEach(function(fun) {
assertEquals("-Infinity", String(1/fun(-0)));
assertEquals("Infinity", String(1/fun(0)));
});
[Math.sinh, Math.asinh].forEach(function(fun) {
assertEquals("-Infinity", String(fun(-Infinity)));
assertEquals("Infinity", String(fun(Infinity)));
assertEquals("-Infinity", String(fun("-Infinity")));
assertEquals("Infinity", String(fun("Infinity")));
});
assertEquals(Infinity, Math.cosh(-Infinity));
assertEquals(Infinity, Math.cosh(Infinity));
assertEquals(Infinity, Math.cosh("-Infinity"));
assertEquals(Infinity, Math.cosh("Infinity"));
assertEquals(-Infinity, Math.atanh(-1));
assertEquals(Infinity, Math.atanh(1));
// Math.atanh(x) is NaN for |x| > 1 and NaN
[1.000000000001, Math.PI, 10000000, 2, Infinity, NaN].forEach(function(x) {
assertTrue(isNaN(Math.atanh(-x)));
assertTrue(isNaN(Math.atanh(x)));
});
assertEquals(0, Math.sinh(0));
assertEquals(-Infinity, 1/Math.sinh(-0));
assertEquals(1, Math.tanh(Infinity));
assertEquals(-1, Math.tanh(-Infinity));
assertEquals(1, Math.cosh(0));
assertEquals(1, Math.cosh(-0));
assertEquals(0, Math.acosh(1));
assertEquals("Infinity", String(Math.acosh(Infinity)));
// Math.acosh(x) is NaN for x < 1
[0.99999999999, 0.2, -1000, 0, -0].forEach(function(x) {
assertTrue(isNaN(Math.acosh(x)));
});
// Some random samples.
assertEqualsDelta(74.20321057778875, Math.sinh(5), 1E-12);
assertEqualsDelta(-74.20321057778875, Math.sinh(-5), 1E-12);
assertEqualsDelta(1.1276259652063807, Math.cosh(0.5), 1E-12);
assertEqualsDelta(74.20994852478785, Math.cosh(5), 1E-12);
assertEqualsDelta(1.1276259652063807, Math.cosh(-0.5), 1E-12);
assertEqualsDelta(74.20994852478785, Math.cosh(-5), 1E-12);
assertEqualsDelta(0.4621171572600, Math.tanh(0.5), 1E-12);
assertEqualsDelta(0.9999092042625, Math.tanh(5), 1E-12);
assertEqualsDelta(-0.4621171572600, Math.tanh(-0.5), 1E-12);
assertEqualsDelta(-0.9999092042625, Math.tanh(-5), 1E-12);
assertEqualsDelta(0.4812118250596, Math.asinh(0.5), 1E-12);
assertEqualsDelta(2.3124383412727, Math.asinh(5), 1E-12);
assertEqualsDelta(-0.4812118250596, Math.asinh(-0.5), 1E-12);
assertEqualsDelta(-2.3124383412727, Math.asinh(-5), 1E-12);
assertEqualsDelta(0.9624236501192, Math.acosh(1.5), 1E-12);
assertEqualsDelta(2.2924316695612, Math.acosh(5), 1E-12);
assertEqualsDelta(0.4435682543851, Math.acosh(1.1), 1E-12);
assertEqualsDelta(1.3169578969248, Math.acosh(2), 1E-12);
assertEqualsDelta(0.5493061443341, Math.atanh(0.5), 1E-12);
assertEqualsDelta(0.1003353477311, Math.atanh(0.1), 1E-12);
assertEqualsDelta(-0.5493061443341, Math.atanh(-0.5), 1E-12);
assertEqualsDelta(-0.1003353477311, Math.atanh(-0.1), 1E-12);
[0, 1E-50, 1E-10, 1E10, 1E50, 1E100, 1E150].forEach(function(x) {
assertEqualsDelta(Math.asinh(x), -Math.asinh(-x), 1E-12);
});
[1-(1E-16), 0, 1E-10, 1E-50].forEach(function(x) {
assertEqualsDelta(Math.atanh(x), -Math.atanh(-x), 1E-12);
});
// Implementation-specific tests for sinh.
// Case |x| < 2^-28
assertEquals(Math.pow(2, -29), Math.sinh(Math.pow(2, -29)));
assertEquals(-Math.pow(2, -29), Math.sinh(-Math.pow(2, -29)));
// Case |x| < 1
assertEquals(0.5210953054937474, Math.sinh(0.5));
assertEquals(-0.5210953054937474, Math.sinh(-0.5));
// sinh(10*log(2)) = 1048575/2048, case |x| < 22
assertEquals(1048575/2048, Math.sinh(10*Math.LN2));
assertEquals(-1048575/2048, Math.sinh(-10*Math.LN2));
// Case |x| < 22
assertEquals(11013.232874703393, Math.sinh(10));
assertEquals(-11013.232874703393, Math.sinh(-10));
// Case |x| in [22, log(maxdouble)]
assertEquals(2.1474836479999983e9, Math.sinh(32*Math.LN2));
assertEquals(-2.1474836479999983e9, Math.sinh(-32*Math.LN2));
// Case |x| in [22, log(maxdouble)]
assertEquals(1.3440585709080678e43, Math.sinh(100));
assertEquals(-1.3440585709080678e43, Math.sinh(-100));
// No overflow, case |x| in [log(maxdouble), threshold]
assertEquals(1.7976931348621744e308, Math.sinh(710.4758600739439));
assertEquals(-1.7976931348621744e308, Math.sinh(-710.4758600739439));
// Overflow, case |x| > threshold
assertEquals(Infinity, Math.sinh(710.475860073944));
assertEquals(-Infinity, Math.sinh(-710.475860073944));
assertEquals(Infinity, Math.sinh(1000));
assertEquals(-Infinity, Math.sinh(-1000));
// Implementation-specific tests for cosh.
// Case |x| < 2^-55
assertEquals(1, Math.cosh(Math.pow(2, -56)));
assertEquals(1, Math.cosh(-Math.pow(2, -56)));
// Case |x| < 1/2*log(2). cosh(Math.LN2/4) = (sqrt(2)+1)/2^(5/4)
assertEquals(1.0150517651282178, Math.cosh(Math.LN2/4));
assertEquals(1.0150517651282178, Math.cosh(-Math.LN2/4));
// Case 1/2*log(2) < |x| < 22. cosh(10*Math.LN2) = 1048577/2048
assertEquals(512.00048828125, Math.cosh(10*Math.LN2));
assertEquals(512.00048828125, Math.cosh(-10*Math.LN2));
// Case 22 <= |x| < log(maxdouble)
assertEquals(2.1474836479999983e9, Math.cosh(32*Math.LN2));
assertEquals(2.1474836479999983e9, Math.cosh(-32*Math.LN2));
// Case log(maxdouble) <= |x| <= overflowthreshold
assertEquals(1.7976931348621744e308, Math.cosh(710.4758600739439));
assertEquals(1.7976931348621744e308, Math.cosh(-710.4758600739439));
// Overflow.
assertEquals(Infinity, Math.cosh(710.475860073944));
assertEquals(Infinity, Math.cosh(-710.475860073944));
// Implementation-specific tests for tanh.
// Case |x| < 2^-55
var two_56 = Math.pow(2, -56);
assertEquals(two_56, Math.tanh(two_56));
assertEquals(-two_56, Math.tanh(-two_56));
// Case |x| < 1
assertEquals(0.6, Math.tanh(Math.LN2));
assertEquals(-0.6, Math.tanh(-Math.LN2));
// Case 1 < |x| < 22
assertEquals(15/17, Math.tanh(2 * Math.LN2));
assertEquals(-15/17, Math.tanh(-2 * Math.LN2));
// Case |x| > 22
assertEquals(1, Math.tanh(100));
assertEquals(-1, Math.tanh(-100));
// Test against overflow
assertEquals(1, Math.tanh(1e300));
assertEquals(-1, Math.tanh(-1e300));