jdk-24/test/hotspot/jtreg/compiler/loopopts/superword/MinMaxRed_Int.java

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/**
 * @test
 * @bug 8302673
 * @summary [SuperWord] MaxReduction and MinReduction should vectorize for int
 * @library /test/lib /
 * @run driver compiler.loopopts.superword.MinMaxRed_Int
 */

package compiler.loopopts.superword;

import compiler.lib.ir_framework.*;
import java.util.Arrays;
import java.util.Random;
import jdk.test.lib.Utils;

public class MinMaxRed_Int {

    private static final Random random = Utils.getRandomInstance();

    public static void main(String[] args) throws Exception {
        TestFramework framework = new TestFramework();
        framework.addFlags("-XX:+IgnoreUnrecognizedVMOptions",
                           "-XX:LoopUnrollLimit=250",
                           "-XX:CompileThresholdScaling=0.1");
        framework.start();
    }

    @Run(test = {"maxReductionImplement"},
         mode = RunMode.STANDALONE)
    public void runMaxTest() {
        int[] a = new int[1024];
        int[] b = new int[1024];
        ReductionInit(a, b);
        int res = 0;
        for (int j = 0; j < 2000; j++) {
            res = maxReductionImplement(a, b, res);
        }
        if (res == Arrays.stream(a).max().getAsInt()) {
            System.out.println("Success");
        } else {
            throw new AssertionError("Failed");
        }
    }

    @Run(test = {"minReductionImplement"},
         mode = RunMode.STANDALONE)
    public void runMinTest() {
        int[] a = new int[1024];
        int[] b = new int[1024];
        ReductionInit(a, b);
        int res = 1;
        for (int j = 0; j < 2000; j++) {
            res = minReductionImplement(a, b, res);
        }
        if (res == Arrays.stream(a).min().getAsInt()) {
            System.out.println("Success");
        } else {
            throw new AssertionError("Failed");
        }
    }

    public static void ReductionInit(int[] a, int[] b) {
        for (int i = 0; i < a.length; i++) {
            a[i] = random.nextInt();
            b[i] = 1;
        }
    }

    @Test
    @IR(applyIf = {"SuperWordReductions", "true"},
        applyIfCPUFeatureOr = { "sse4.1", "true" , "asimd" , "true"},
        counts = {IRNode.MIN_REDUCTION_V, " > 0"})
    public static int minReductionImplement(int[] a, int[] b, int res) {
        for (int i = 0; i < a.length; i++) {
            res = Math.min(res, a[i] * b[i]);
        }
        return res;
    }

    @Test
    @IR(applyIf = {"SuperWordReductions", "true"},
        applyIfCPUFeatureOr = { "sse4.1", "true" , "asimd" , "true"},
        counts = {IRNode.MAX_REDUCTION_V, " > 0"})
    public static int maxReductionImplement(int[] a, int[] b, int res) {
        for (int i = 0; i < a.length; i++) {
            res = Math.max(res, a[i] * b[i]);
        }
        return res;
    }
}