test/hotspot/jtreg/compiler/predicates/TestDisabledLoopPredicates.java

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package compiler.predicates;

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

/*
 * @test
 * @bug 8347449
 * @summary Test that profiled loop predicates are turned off if loop predicates are turned off
 * @library /test/lib /
 * @run driver compiler.predicates.TestDisabledLoopPredicates
 */

public class TestDisabledLoopPredicates {
    static final int SIZE = 100;
    static final int MIN = 3;

    public static void main(String[] args) {
        TestFramework.runWithFlags("-XX:+UseLoopPredicate",
                                   "-XX:+UseProfiledLoopPredicate");
        TestFramework.runWithFlags("-XX:-UseLoopPredicate");
        TestFramework.runWithFlags("-XX:-UseProfiledLoopPredicate");
    }

    @Run(test = "test")
    private static void check() {
        int res = test(true);
        Asserts.assertEQ(res, ((SIZE - 1) * SIZE - MIN * (MIN + 1)) / 2);
    }

    @DontInline
    private static void blackhole(int i) {
    }

    @DontInline
    private static int[] getArr() {
        int[] arr = new int[SIZE];
        for (int i = 0; i < SIZE; i++) {
            arr[i] = i;
        }

        return arr;
    }

    @Test
    @IR(counts = { IRNode.LOOP_PARSE_PREDICATE, "1",
                   IRNode.PROFILED_LOOP_PARSE_PREDICATE, "1" },
        applyIfAnd = { "UseLoopPredicate", "true",
                       "UseProfiledLoopPredicate", "true" })
    @IR(failOn = { IRNode.LOOP_PARSE_PREDICATE,
                   IRNode.PROFILED_LOOP_PARSE_PREDICATE },
        applyIf = { "UseLoopPredicate", "false" })
    @IR(counts = { IRNode.LOOP_PARSE_PREDICATE, "1" },
        failOn = { IRNode.PROFILED_LOOP_PARSE_PREDICATE },
        applyIfAnd = { "UseLoopPredicate", "true",
                       "UseProfiledLoopPredicate", "false" })
    public static int test(boolean cond) {
        int[] arr = getArr();
        int sum = 0;
        for (int i = 0; i < arr.length; i++) {
            if (cond) {
                if (arr[i] > MIN) {
                    sum += arr[i];
                }
            }
            blackhole(arr[i]);
        }

        return sum;
    }
}