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package compiler.c2.irTests;

import jdk.test.lib.Asserts;
import compiler.lib.ir_framework.*;

/*
 * @test
 * @bug 8286104
 * @summary Test that C2 uses aggressive liveness to get rid of the boxing object which is
 *  only consumed by uncommon_trap.
 * @library /test/lib /
 * @run driver compiler.c2.irTests.TestOptimizeUnstableIf
 */
public class TestOptimizeUnstableIf {

    public static void main(String[] args) {
        TestFramework.run();
    }

    @Test
    @Arguments(values = {Argument.MAX}) // the argument needs to be big enough to fall out of cache.
    @IR(failOn = {IRNode.ALLOC_OF, "Integer"})
    public static int boxing_object(int value) {
        Integer ii = Integer.valueOf(value);
        int sum = 0;

        if (value > 999_999) {
            sum += ii.intValue();
        }

        return sum;
    }

    @Check(test = "boxing_object")
    public void checkWithTestInfo(int result, TestInfo info) {
        if (info.isWarmUp()) {
            // Accessing the cached boxing object during warm-up phase. It prevents parser from pruning that branch of Interger.valueOf();
            // This guarantees that a phi node is generated, which merge a cached object and the newly allocated object. eg.
            // 112:  Phi  ===  108  168  188  [[ 50 ]]  #java/lang/Integer:NotNull:exact *  Oop:java/lang/Integer:NotNull:exact *
            // 168: a cached object
            // 188: result of AllocateNode
            //  50: uncommon_trap unstable_if
            value += Integer.valueOf(0);
        }

        Asserts.assertEQ(result, Integer.MAX_VALUE);
    }

    public static Integer value = Integer.valueOf(0);
}