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118 lines
4.1 KiB
Java
118 lines
4.1 KiB
Java
/*
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* Copyright (c) 2026, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* @test
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* @bug 8379327
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* @summary Verify correctness for combined low/high 64-bit multiplication patterns.
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* @library /test/lib /
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* @run driver ${test.main.class}
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*/
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package compiler.c2;
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import compiler.lib.generators.Generator;
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import compiler.lib.generators.Generators;
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import compiler.lib.ir_framework.*;
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import java.math.BigInteger;
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public class TestMultiplyHighLowFusion {
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private static final BigInteger MASK_64 = BigInteger.ONE.shiftLeft(64).subtract(BigInteger.ONE);
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private static final Generator<Long> LONG_GEN = Generators.G.longs();
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public static void main(String[] args) {
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TestFramework.run();
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}
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@Test
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@IR(applyIfPlatform = {"x64", "true"}, phase = CompilePhase.PRINT_IDEAL, counts = {"\\bMulHiLoL\\b", "1"})
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public static long doMath(long a, long b) {
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long low = a * b;
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long high = Math.multiplyHigh(a, b);
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return low + high;
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}
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@Test
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@IR(applyIfPlatform = {"x64", "true"}, phase = CompilePhase.PRINT_IDEAL, counts = {"\\bMulHiLoL\\b", "1"})
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public static long doMathSwapped(long a, long b) {
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long low = b * a;
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long high = Math.multiplyHigh(b, a);
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return low + high;
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}
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@Test
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@IR(applyIfPlatform = {"x64", "true"}, phase = CompilePhase.PRINT_IDEAL, counts = {"\\bUMulHiLoL\\b", "1"})
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public static long doUnsignedMath(long a, long b) {
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long low = a * b;
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long high = Math.unsignedMultiplyHigh(a, b);
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return low + high;
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}
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@Test
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@IR(applyIfPlatform = {"x64", "true"}, phase = CompilePhase.PRINT_IDEAL, counts = {"\\bUMulHiLoL\\b", "1"})
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public static long doUnsignedMathSwapped(long a, long b) {
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long low = b * a;
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long high = Math.unsignedMultiplyHigh(b, a);
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return low + high;
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}
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@Run(test = {"doMath", "doMathSwapped", "doUnsignedMath", "doUnsignedMathSwapped"})
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public void runTests() {
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verifyPair(LONG_GEN.next(), LONG_GEN.next());
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}
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private void verifyPair(long a, long b) {
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long expectedSigned = expectedSigned(a, b);
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long expectedUnsigned = expectedUnsigned(a, b);
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if (doMath(a, b) != expectedSigned) {
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throw new RuntimeException("Signed mismatch for a=" + a + ", b=" + b);
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}
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if (doMathSwapped(a, b) != expectedSigned) {
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throw new RuntimeException("Signed swapped mismatch for a=" + a + ", b=" + b);
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}
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if (doUnsignedMath(a, b) != expectedUnsigned) {
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throw new RuntimeException("Unsigned mismatch for a=" + a + ", b=" + b);
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}
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if (doUnsignedMathSwapped(a, b) != expectedUnsigned) {
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throw new RuntimeException("Unsigned swapped mismatch for a=" + a + ", b=" + b);
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}
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}
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private static long expectedSigned(long a, long b) {
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BigInteger product = BigInteger.valueOf(a).multiply(BigInteger.valueOf(b));
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long low = product.longValue();
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long high = product.shiftRight(64).longValue();
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return low + high;
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}
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private static long expectedUnsigned(long a, long b) {
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BigInteger ua = BigInteger.valueOf(a).and(MASK_64);
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BigInteger ub = BigInteger.valueOf(b).and(MASK_64);
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BigInteger product = ua.multiply(ub);
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long low = product.longValue();
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long high = product.shiftRight(64).longValue();
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return low + high;
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}
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}
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