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package compiler.integerArithmetic;

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

/*
 * @test
 * @bug 8347365
 * @summary Tests that divisions are hoisted when their zero checks are elided.
 * @library /test/lib /
 * @run driver ${test.main.class}
 */
public class TestHoistDivision {
    public static void main(String[] args) {
        TestFramework.run();
    }

    @DontInline
    private static void dontInline() {}

    @Run(test = {"testCommon", "testHoistOutOfLoop"})
    public void run() {
        Asserts.assertEQ(2, testCommon(1, 1));
        Asserts.assertEQ(0, testHoistOutOfLoop(1, 1, true, 1, 4, 2));
        Asserts.assertEQ(0, testHoistOutOfLoop(1, 1, false, 1, 4, 2));
    }

    @Test
    @IR(counts = {IRNode.DIV_I, "1", IRNode.DIV_BY_ZERO_TRAP, "1"})
    public int testCommon(int x, int y) {
        // The 2 divisions should be commoned
        int result = x / y;
        dontInline();
        return result + x / y;
    }

    @Test
    @IR(failOn = IRNode.DIV_BY_ZERO_TRAP, counts = {IRNode.DIV_I, "1", IRNode.TRAP, "1"})
    public int testHoistOutOfLoop(int x, int y, boolean b, int start, int limit, int step) {
        // The divisions should be hoisted out of the loop, allowing them to be commoned
        int result = 0;
        for (int i = start; i < limit; i *= step) {
            if (b) {
                dontInline();
                result += x / y;
            } else {
                result -= x / y;
            }
            b = !b;
        }
        return result;
    }
}