jdk-24/hotspot/test/compiler/loopopts/superword/SumRedAbsNeg_Double.java

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/**
 * @test
 * @bug 8138583
 * @summary Add C2 AArch64 Superword support for scalar sum reduction optimizations : double abs & neg test
 * @requires os.arch=="aarch64"
 *
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+SuperWordReductions -XX:LoopUnrollLimit=250 -XX:LoopMaxUnroll=2 -XX:CompileThresholdScaling=0.1 SumRedAbsNeg_Double
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-SuperWordReductions -XX:LoopUnrollLimit=250 -XX:LoopMaxUnroll=2 -XX:CompileThresholdScaling=0.1 SumRedAbsNeg_Double
 *
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+SuperWordReductions -XX:LoopUnrollLimit=250 -XX:LoopMaxUnroll=4 -XX:CompileThresholdScaling=0.1 SumRedAbsNeg_Double
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-SuperWordReductions -XX:LoopUnrollLimit=250 -XX:LoopMaxUnroll=4 -XX:CompileThresholdScaling=0.1 SumRedAbsNeg_Double
 *
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+SuperWordReductions -XX:LoopUnrollLimit=250 -XX:LoopMaxUnroll=8 -XX:CompileThresholdScaling=0.1 SumRedAbsNeg_Double
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-SuperWordReductions -XX:LoopUnrollLimit=250 -XX:LoopMaxUnroll=8 -XX:CompileThresholdScaling=0.1 SumRedAbsNeg_Double
 *
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:+SuperWordReductions -XX:LoopUnrollLimit=250 -XX:LoopMaxUnroll=16 -XX:CompileThresholdScaling=0.1 SumRedAbsNeg_Double
 * @run main/othervm -XX:+IgnoreUnrecognizedVMOptions -XX:-SuperWordReductions -XX:LoopUnrollLimit=250 -XX:LoopMaxUnroll=16 -XX:CompileThresholdScaling=0.1 SumRedAbsNeg_Double
 */

public class SumRedAbsNeg_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 = 3.6028590866691944E19;

    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.abs(-a[i] * -b[i]) + Math.abs(-a[i] * -c[i]) + Math.abs(-b[i] * -c[i]);
      total += d[i];
    }
    return total;
  }

}