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The GraalVM compiler and the Graal-truffle optimizer.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * by Oracle in the LICENSE file that accompanied this code.
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 * accompanied this code).
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package org.graalvm.compiler.replacements.nodes;

import org.graalvm.compiler.core.common.Stride;
import org.graalvm.compiler.core.common.spi.ForeignCallDescriptor;
import org.graalvm.compiler.nodes.ValueNode;
import org.graalvm.compiler.replacements.NodeStrideUtil;

public final class ArrayRegionCompareToForeignCalls {
    private static final ForeignCallDescriptor STUB_DYNAMIC_STRIDES = ForeignCalls.pureFunctionForeignCallDescriptor("arrayRegionCompareToDynamicStrides",
                    int.class, Object.class, long.class, Object.class, long.class, int.class, int.class);
    /**
     * CAUTION: the ordering here is important: entries 0-9 must match the indices generated by
     * {@link NodeStrideUtil#getDirectStubCallIndex(ValueNode, Stride, Stride)}.
     *
     * @see #getStub(ArrayRegionCompareToNode)
     */
    public static final ForeignCallDescriptor[] STUBS = {
                    foreignCallDescriptor("arrayRegionCompareToS1S1"),
                    foreignCallDescriptor("arrayRegionCompareToS1S2"),
                    foreignCallDescriptor("arrayRegionCompareToS1S4"),
                    foreignCallDescriptor("arrayRegionCompareToS2S1"),
                    foreignCallDescriptor("arrayRegionCompareToS2S2"),
                    foreignCallDescriptor("arrayRegionCompareToS2S4"),
                    foreignCallDescriptor("arrayRegionCompareToS4S1"),
                    foreignCallDescriptor("arrayRegionCompareToS4S2"),
                    foreignCallDescriptor("arrayRegionCompareToS4S4"),
                    STUB_DYNAMIC_STRIDES,
    };

    private static ForeignCallDescriptor foreignCallDescriptor(String name) {
        return ForeignCalls.pureFunctionForeignCallDescriptor(name, int.class, Object.class, long.class, Object.class, long.class, int.class);
    }

    public static ForeignCallDescriptor getStub(ArrayRegionCompareToNode node) {
        int directStubCallIndex = node.getDirectStubCallIndex();
        return directStubCallIndex < 0 ? STUB_DYNAMIC_STRIDES : STUBS[directStubCallIndex];
    }
}