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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package org.openjdk.bench.java.lang;

import org.openjdk.jmh.annotations.*;
import org.openjdk.jmh.infra.Blackhole;

import java.util.concurrent.TimeUnit;
import java.util.random.RandomGenerator;

@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Thread)
@Warmup(iterations = 5, time = 1)
@Measurement(iterations = 5, time = 1)
@Fork(3)
public class FPComparison {
    static final int INVOCATIONS = 1024;

    static final float[] f1 = new float[INVOCATIONS];
    static final double[] d1 = new double[INVOCATIONS];
    static final float[] f2 = new float[INVOCATIONS];
    static final double[] d2 = new double[INVOCATIONS];
    static final int[] res = new int[INVOCATIONS];;
    static final long[] resLong = new long[INVOCATIONS];
    static final float[] resFloat = new float[INVOCATIONS];
    static final double[] resDouble = new double[INVOCATIONS];

    @Setup
    public void setup() {
        var random = RandomGenerator.getDefault();
        for (int i = 0; i < INVOCATIONS; i++) {
            int type = random.nextInt(5);
            if (type == 1) {
                f1[i] = random.nextFloat();
                d1[i] = random.nextDouble();
                f2[i] = random.nextFloat();
                d2[i] = random.nextDouble();
            } else if (type == 2) {
                f1[i] = Float.POSITIVE_INFINITY;
                d1[i] = Double.POSITIVE_INFINITY;
                f2[i] = Float.POSITIVE_INFINITY;
                d2[i] = Double.POSITIVE_INFINITY;
            } else if (type == 3) {
                f1[i] = Float.NEGATIVE_INFINITY;
                d1[i] = Double.NEGATIVE_INFINITY;
                f2[i] = Float.NEGATIVE_INFINITY;
                d2[i] = Double.NEGATIVE_INFINITY;
            } else if (type >= 4) {
                f1[i] = Float.NaN;
                d1[i] = Double.NaN;
                f2[i] = Float.NaN;
                d2[i] = Double.NaN;
            }
        }
    }

    @Benchmark
    public void isNanFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = Float.isNaN(f1[i]) ? 1 : 2;
        }
    }

    @Benchmark
    public void isNanDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = Double.isNaN(d1[i]) ? 1 : 2;
        }
    }

    @Benchmark
    public void isInfiniteFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = Float.isInfinite(f1[i]) ? 1 : 2;
        }
    }

    @Benchmark
    public void isInfiniteDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = Double.isInfinite(d1[i]) ? 1 : 2;
        }
    }

    @Benchmark
    public void isFiniteFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = Float.isFinite(f1[i]) ? 1 : 2;
        }
    }

    @Benchmark
    public void isFiniteDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = Double.isFinite(d1[i]) ? 1 : 2;
        }
    }

    @Benchmark
    public void equalFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = (f1[i] == f2[i]) ? 1 : 2;
        }
    }

    @Benchmark
    public void equalDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = (d1[i] == d2[i]) ? 1 : 2;
        }
    }

    @Benchmark
    public void lessFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = (f1[i] < f2[i]) ? 1 : 2;
        }
    }

    @Benchmark
    public void lessDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = (d1[i] < d2[i]) ? 1 : 2;
        }
    }

    @Benchmark
    public void lessEqualFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = (f1[i] <= f2[i]) ? 1 : 2;
        }
    }

    @Benchmark
    public void lessEqualDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = (d1[i] <= d2[i]) ? 1 : 2;
        }
    }

    @Benchmark
    public void greaterFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = (f1[i] > f2[i]) ? 1 : 2;
        }
    }

    @Benchmark
    public void greaterDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = (d1[i] > d2[i]) ? 1 : 2;
        }
    }

    @Benchmark
    public void greaterEqualFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = (f1[i] >= f2[i]) ? 1 : 2;
        }
    }

    @Benchmark
    public void greaterEqualDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            res[i] = (d1[i] >= d2[i]) ? 1 : 2;
        }
    }

    // --------- result: long ---------

    @Benchmark
    public void equalFloatResLong() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resLong[i] = (f1[i] == f2[i]) ? Long.MAX_VALUE : Long.MIN_VALUE;
        }
    }

    @Benchmark
    public void equalDoubleResLong() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resLong[i] = (d1[i] == d2[i]) ? Long.MAX_VALUE : Long.MIN_VALUE;
        }
    }

    @Benchmark
    public void lessFloatResLong() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resLong[i] = (f1[i] < f2[i]) ? Long.MAX_VALUE : Long.MIN_VALUE;
        }
    }

    @Benchmark
    public void lessDoubleResLong() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resLong[i] = (d1[i] < d2[i]) ? Long.MAX_VALUE : Long.MIN_VALUE;
        }
    }

    @Benchmark
    public void lessEqualFloatResLong() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resLong[i] = (f1[i] <= f2[i]) ? Long.MAX_VALUE : Long.MIN_VALUE;
        }
    }

    @Benchmark
    public void lessEqualDoubleResLong() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resLong[i] = (d1[i] <= d2[i]) ? Long.MAX_VALUE : Long.MIN_VALUE;
        }
    }

    @Benchmark
    public void greaterFloatResLong() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resLong[i] = (f1[i] > f2[i]) ? Long.MAX_VALUE : Long.MIN_VALUE;
        }
    }

    @Benchmark
    public void greaterDoubleResLong() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resLong[i] = (d1[i] > d2[i]) ? Long.MAX_VALUE : Long.MIN_VALUE;
        }
    }

    @Benchmark
    public void greaterEqualFloatResLong() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resLong[i] = (f1[i] >= f2[i]) ? Long.MAX_VALUE : Long.MIN_VALUE;
        }
    }

    @Benchmark
    public void greaterEqualDoubleResLong() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resLong[i] = (d1[i] >= d2[i]) ? Long.MAX_VALUE : Long.MIN_VALUE;
        }
    }

    // --------- result: float ---------

    @Benchmark
    public void equalFloatResFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resFloat[i] = (f1[i] == f2[i]) ? 0.1f : 0.2f;
        }
    }

    @Benchmark
    public void equalDoubleResFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resFloat[i] = (d1[i] == d2[i]) ? 0.1f : 0.2f;
        }
    }

    @Benchmark
    public void lessFloatResFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resFloat[i] = (f1[i] < f2[i]) ? 0.1f : 0.2f;
        }
    }

    @Benchmark
    public void lessDoubleResFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resFloat[i] = (d1[i] < d2[i]) ? 0.1f : 0.2f;
        }
    }

    @Benchmark
    public void lessEqualFloatResFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resFloat[i] = (f1[i] <= f2[i]) ? 0.1f : 0.2f;
        }
    }

    @Benchmark
    public void lessEqualDoubleResFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resFloat[i] = (d1[i] <= d2[i]) ? 0.1f : 0.2f;
        }
    }

    @Benchmark
    public void greaterFloatResFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resFloat[i] = (f1[i] > f2[i]) ? 0.1f : 0.2f;
        }
    }

    @Benchmark
    public void greaterDoubleResFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resFloat[i] = (d1[i] > d2[i]) ? 0.1f : 0.2f;
        }
    }

    @Benchmark
    public void greaterEqualFloatResFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resFloat[i] = (f1[i] >= f2[i]) ? 0.1f : 0.2f;
        }
    }

    @Benchmark
    public void greaterEqualDoubleResFloat() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resFloat[i] = (d1[i] >= d2[i]) ? 0.1f : 0.2f;
        }
    }

    // --------- result: double ---------

    @Benchmark
    public void equalFloatResDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resDouble[i] = (f1[i] == f2[i]) ? 0.1 : 0.2;
        }
    }

    @Benchmark
    public void equalDoubleResDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resDouble[i] = (d1[i] == d2[i]) ? 0.1 : 0.2;
        }
    }

    @Benchmark
    public void lessFloatResDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resDouble[i] = (f1[i] < f2[i]) ? 0.1 : 0.2;
        }
    }

    @Benchmark
    public void lessDoubleResDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resDouble[i] = (d1[i] < d2[i]) ? 0.1 : 0.2;
        }
    }

    @Benchmark
    public void lessEqualFloatResDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resDouble[i] = (f1[i] <= f2[i]) ? 0.1 : 0.2;
        }
    }

    @Benchmark
    public void lessEqualDoubleResDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resDouble[i] = (d1[i] <= d2[i]) ? 0.1 : 0.2;
        }
    }

    @Benchmark
    public void greaterFloatResDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resDouble[i] = (f1[i] > f2[i]) ? 0.1 : 0.2;
        }
    }

    @Benchmark
    public void greaterDoubleResDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resDouble[i] = (d1[i] > d2[i]) ? 0.1 : 0.2;
        }
    }

    @Benchmark
    public void greaterEqualFloatResDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resDouble[i] = (f1[i] >= f2[i]) ? 0.1 : 0.2;
        }
    }

    @Benchmark
    public void greaterEqualDoubleResDouble() {
        for (int i = 0; i < INVOCATIONS; i++) {
            resDouble[i] = (d1[i] >= d2[i]) ? 0.1 : 0.2;
        }
    }
}