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/*
* Copyright (C) 2021 THL A29 Limited, a Tencent company. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* @test
* @bug 8265325 8265940
* @summary test the optimization of pow(x, 0.5)
* @run main/othervm TestPow0Dot5Opt
* @run main/othervm -Xint TestPow0Dot5Opt
* @run main/othervm -Xbatch -XX:TieredStopAtLevel=1 TestPow0Dot5Opt
* @run main/othervm -Xbatch -XX:-TieredCompilation TestPow0Dot5Opt
*/
public class TestPow0Dot5Opt {
static void test(double a) throws Exception {
// pow(x, 0.5) isn't replaced with sqrt(x) for x < 0.0
if (a < 0.0) return;
double r1 = Math.sqrt(a);
double r2 = Math.pow(a, 0.5);
if (r1 != r2) {
throw new RuntimeException("pow(" + a + ", 0.5), expected: " + r1 + ", actual: " + r2);
}
// Special case: pow(+0.0, 0.5) = 0.0
double r = Math.pow(+0.0, 0.5);
if (Double.doubleToRawLongBits(r) != Double.doubleToRawLongBits(0.0)) {
throw new RuntimeException("pow(+0.0, 0.5), expected: 0.0, actual: " + r);
}
// Special case: pow(-0.0, 0.5) = 0.0
r = Math.pow(-0.0, 0.5);
if (Double.doubleToRawLongBits(r) != Double.doubleToRawLongBits(0.0)) {
throw new RuntimeException("pow(-0.0, 0.5), expected: 0.0, actual: " + r);
}
// Special case: pow(Double.POSITIVE_INFINITY, 0.5) = Infinity
r = Math.pow(Double.POSITIVE_INFINITY, 0.5);
if (!(r > 0 && Double.isInfinite(r))) {
throw new RuntimeException("pow(+Infinity, 0.5), expected: Infinity, actual: " + r);
}
// Special case: pow(Double.NEGATIVE_INFINITY, 0.5) = Infinity
r = Math.pow(Double.NEGATIVE_INFINITY, 0.5);
if (!(r > 0 && Double.isInfinite(r))) {
throw new RuntimeException("pow(-Infinity, 0.5), expected: Infinity, actual: " + r);
}
// Special case: pow(Double.NaN, 0.5) = NaN
r = Math.pow(Double.NaN, 0.5);
if (!Double.isNaN(r)) {
throw new RuntimeException("pow(NaN, 0.5), expected: NaN, actual: " + r);
}
}
public static void main(String[] args) throws Exception {
for (int i = 0; i < 10; i++) {
for (int j = 1; j < 100000; j++) {
test(j * 1.0);
test(1.0 / j);
}
}
}
}
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