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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package org.graalvm.compiler.hotspot.replacements;

import static org.graalvm.compiler.hotspot.replacements.HotSpotReplacementsUtil.arrayStart;

import org.graalvm.compiler.api.replacements.ClassSubstitution;
import org.graalvm.compiler.api.replacements.MethodSubstitution;
import org.graalvm.compiler.hotspot.HotSpotBackend;

@ClassSubstitution(className = "java.math.BigInteger", optional = true)
public class BigIntegerSubstitutions {

    @MethodSubstitution(isStatic = false)
    static int[] multiplyToLen(@SuppressWarnings("unused") Object receiver, int[] x, int xlen, int[] y, int ylen, int[] zIn) {
        return multiplyToLenStatic(x, xlen, y, ylen, zIn);
    }

    @MethodSubstitution(isStatic = true)
    static int[] multiplyToLenStatic(int[] x, int xlen, int[] y, int ylen, int[] zIn) {
        int[] zResult = zIn;
        int zLen;
        if (zResult == null || zResult.length < (xlen + ylen)) {
            zLen = xlen + ylen;
            zResult = new int[xlen + ylen];
        } else {
            zLen = zIn.length;
        }
        HotSpotBackend.multiplyToLenStub(arrayStart(x), xlen, arrayStart(y), ylen, arrayStart(zResult), zLen);
        return zResult;
    }
}