/*

 * Copyright (c) 2017, 2019, Oracle and/or its affiliates. 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.

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package org.graalvm.compiler.core.test;

import org.graalvm.compiler.debug.DebugContext;

import org.graalvm.compiler.debug.DebugDumpScope;

import org.graalvm.compiler.loop.DefaultLoopPolicies;

import org.graalvm.compiler.loop.phases.LoopFullUnrollPhase;

import org.graalvm.compiler.nodes.LoopBeginNode;

import org.graalvm.compiler.nodes.StructuredGraph;

import org.graalvm.compiler.nodes.StructuredGraph.AllowAssumptions;

import org.graalvm.compiler.nodes.spi.CoreProviders;

import org.graalvm.compiler.phases.common.CanonicalizerPhase;

import org.junit.Test;

public class LoopFullUnrollTest extends GraalCompilerTest {

    public static int testMinToMax(int input) {

        int ret = 2;

        int current = input;

        for (long i = Long.MIN_VALUE; i < Long.MAX_VALUE; i++) {

            ret *= 2 + current;

            current /= 50;

        }

        return ret;

    }

    @Test

    public void runMinToMax() throws Throwable {

        test("testMinToMax", 1);

    }

    public static int testMinTo0(int input) {

        int ret = 2;

        int current = input;

        for (long i = Long.MIN_VALUE; i <= 0; i++) {

            ret *= 2 + current;

            current /= 50;

        }

        return ret;

    }

    @Test

    public void runMinTo0() throws Throwable {

        test("testMinTo0", 1);

    }

    public static int testNegativeTripCount(int input) {

        int ret = 2;

        int current = input;

        for (long i = 0; i <= -20; i++) {

            ret *= 2 + current;

            current /= 50;

        }

        return ret;

    }

    @Test

    public void runNegativeTripCount() throws Throwable {

        test("testNegativeTripCount", 0);

    }

    @SuppressWarnings("try")

    private void test(String snippet, int loopCount) {

        DebugContext debug = getDebugContext();

        try (DebugContext.Scope s = debug.scope(getClass().getSimpleName(), new DebugDumpScope(snippet))) {

            final StructuredGraph graph = parseEager(snippet, AllowAssumptions.NO, debug);

            CoreProviders context = getProviders();

            new LoopFullUnrollPhase(new CanonicalizerPhase(), new DefaultLoopPolicies()).apply(graph, context);

            assertTrue(graph.getNodes().filter(LoopBeginNode.class).count() == loopCount);

        } catch (Throwable e) {

            throw debug.handle(e);

        }

    }

}