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

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/**
 * @test
 * @bug 8135028
 * @summary Add C2 x86 Superword support for scalar sum reduction optimizations : double sqrt test
 * @requires os.arch=="x86" | os.arch=="i386" | os.arch=="amd64" | os.arch=="x86_64" | os.arch=="aarch64" | os.arch=="riscv64"
 *
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:LoopUnrollLimit=250
 *      -XX:CompileThresholdScaling=0.1
 *      -XX:+SuperWordReductions
 *      -XX:LoopMaxUnroll=2
 *      compiler.loopopts.superword.SumRedSqrt_Double
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:LoopUnrollLimit=250
 *      -XX:CompileThresholdScaling=0.1
 *      -XX:-SuperWordReductions
 *      -XX:LoopMaxUnroll=2
 *      compiler.loopopts.superword.SumRedSqrt_Double
 *
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:LoopUnrollLimit=250
 *      -XX:CompileThresholdScaling=0.1
 *      -XX:+SuperWordReductions
 *      -XX:LoopMaxUnroll=4
 *      compiler.loopopts.superword.SumRedSqrt_Double
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:LoopUnrollLimit=250
 *      -XX:CompileThresholdScaling=0.1
 *      -XX:-SuperWordReductions
 *      -XX:LoopMaxUnroll=4
 *      compiler.loopopts.superword.SumRedSqrt_Double
 *
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:LoopUnrollLimit=250
 *      -XX:CompileThresholdScaling=0.1
 *      -XX:+SuperWordReductions
 *      -XX:LoopMaxUnroll=8
 *      compiler.loopopts.superword.SumRedSqrt_Double
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:LoopUnrollLimit=250
 *      -XX:CompileThresholdScaling=0.1
 *      -XX:-SuperWordReductions
 *      -XX:LoopMaxUnroll=8
 *      compiler.loopopts.superword.SumRedSqrt_Double
 *
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:LoopUnrollLimit=250
 *      -XX:CompileThresholdScaling=0.1
 *      -XX:+SuperWordReductions
 *      -XX:LoopMaxUnroll=16
 *      compiler.loopopts.superword.SumRedSqrt_Double
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:LoopUnrollLimit=250
 *      -XX:CompileThresholdScaling=0.1
 *      -XX:-SuperWordReductions
 *      -XX:LoopMaxUnroll=16
 *      compiler.loopopts.superword.SumRedSqrt_Double
 */


package compiler.loopopts.superword;

public class SumRedSqrt_Double {
    public static void main(String[] args) throws Exception {
        double[] a = new double[256 * 1024];
        double[] b = new double[256 * 1024];
        double[] c = new double[256 * 1024];
        double[] d = new double[256 * 1024];
        sumReductionInit(a, b, c);
        double total = 0;
        double valid = 2.06157643776E14;
        for (int j = 0; j < 2000; j++) {
            total = sumReductionImplement(a, b, c, d, total);
        }
        if (total == valid) {
            System.out.println("Success");
        } else {
            System.out.println("Invalid sum of elements variable in total: " + total);
            System.out.println("Expected value = " + valid);
            throw new Exception("Failed");
        }
    }

    public static void sumReductionInit(
            double[] a,
            double[] b,
            double[] c) {
        for (int j = 0; j < 1; j++) {
            for (int i = 0; i < a.length; i++) {
                a[i] = i * 1 + j;
                b[i] = i * 1 - j;
                c[i] = i + j;
            }
        }
    }

    public static double sumReductionImplement(
            double[] a,
            double[] b,
            double[] c,
            double[] d,
            double total) {
        for (int i = 0; i < a.length; i++) {
            d[i] = Math.sqrt(a[i] * b[i]) + Math.sqrt(a[i] * c[i]) + Math.sqrt(b[i] * c[i]);
            total += d[i];
        }
        return total;
    }

}