jdk-24/test/hotspot/jtreg/compiler/intrinsics/math/TestFpMinMaxReductions.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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/**
 * @test
 * @bug 8287087
 * @summary Test that floating-point min/max x64 operations are implemented
 *          differently depending on whether they are part of a reduction. These
 *          tests complement those in TestFpMinMaxIntrinsics, which focus more
 *          on correctness aspects.
 * @library /test/lib /
 * @requires os.simpleArch == "x64" & vm.cpu.features ~= ".*avx.*"
 * @run driver compiler.intrinsics.math.TestFpMinMaxReductions
 */

package compiler.intrinsics.math;

import compiler.lib.ir_framework.*;

public class TestFpMinMaxReductions {

    private static float acc;
    private static float floatInput1;
    private static float floatInput2;
    private static float[] floatArray = new float[1000];

    private static double doubleInput1;
    private static double doubleInput2;
    private static double[] doubleArray = new double[1000];

    private static int stride = 1;

    public static void main(String[] args) throws Exception {
        TestFramework.run();
    }

    @Test
    @IR(counts = {IRNode.MIN_F_REG, "1"},
        failOn = {IRNode.MIN_F_REDUCTION_REG})
    private static float testFloatMin() {
        return Math.min(floatInput1, floatInput2);
    }

    @Test
    @IR(counts = {IRNode.MAX_F_REG, "1"},
        failOn = {IRNode.MAX_F_REDUCTION_REG})
    private static float testFloatMax() {
        return Math.max(floatInput1, floatInput2);
    }

    @Test
    @IR(counts = {IRNode.MIN_F_REDUCTION_REG, ">= 1"})
    private static float testFloatMinReduction() {
        float fmin = Float.POSITIVE_INFINITY;
        for (int i = 0; i < floatArray.length; i++) {
            fmin = Math.min(fmin, floatArray[i]);
        }
        return fmin;
    }

    @Test
    @IR(counts = {IRNode.MIN_F_REDUCTION_REG, ">= 1"})
    private static float testFloatMinReductionPartiallyUnrolled() {
        float fmin = Float.POSITIVE_INFINITY;
        for (int i = 0; i < floatArray.length / 2; i++) {
            fmin = Math.min(fmin, floatArray[2*i]);
            fmin = Math.min(fmin, floatArray[2*i + 1]);
        }
        return fmin;
    }

    @Test
    @IR(counts = {IRNode.MIN_F_REDUCTION_REG, ">= 1"})
    private static float testFloatMinReductionNonCounted() {
        float fmin = Float.POSITIVE_INFINITY;
        for (int i = 0; i < floatArray.length; i += stride) {
            fmin = Math.min(fmin, floatArray[i]);
        }
        return fmin;
    }

    @Test
    @IR(counts = {IRNode.MIN_F_REDUCTION_REG, ">= 1"})
    private static float testFloatMinReductionGlobalAccumulator() {
        acc = Float.POSITIVE_INFINITY;
        for (int i = 0; i < floatArray.length; i++) {
            acc = Math.min(acc, floatArray[i]);
        }
        return acc;
    }

    @Test
    @IR(counts = {IRNode.MIN_F_REDUCTION_REG, ">= 1"})
    private static float testFloatMinReductionInOuterLoop() {
        float fmin = Float.POSITIVE_INFINITY;
        int count = 0;
        for (int i = 0; i < floatArray.length; i++) {
            fmin = Math.min(fmin, floatArray[i]);
            for (int j = 0; j < 10; j += stride) {
                count++;
            }
        }
        return fmin + count;
    }

    @Test
    @IR(counts = {IRNode.MAX_F_REDUCTION_REG, ">= 1"})
    private static float testFloatMaxReduction() {
        float fmax = Float.NEGATIVE_INFINITY;
        for (int i = 0; i < floatArray.length; i++) {
            fmax = Math.max(fmax, floatArray[i]);
        }
        return fmax;
    }

    @Test
    @IR(counts = {IRNode.MIN_D_REG, "1"},
        failOn = {IRNode.MIN_D_REDUCTION_REG})
    private static double testDoubleMin() {
        return Math.min(doubleInput1, doubleInput2);
    }

    @Test
    @IR(counts = {IRNode.MAX_D_REG, "1"},
        failOn = {IRNode.MAX_D_REDUCTION_REG})
    private static double testDoubleMax() {
        return Math.max(doubleInput1, doubleInput2);
    }

    @Test
    @IR(counts = {IRNode.MIN_D_REDUCTION_REG, ">= 1"})
    private static double testDoubleMinReduction() {
        double fmin = Double.POSITIVE_INFINITY;
        for (int i = 0; i < doubleArray.length; i++) {
            fmin = Math.min(fmin, doubleArray[i]);
        }
        return fmin;
    }

    @Test
    @IR(counts = {IRNode.MAX_D_REDUCTION_REG, ">= 1"})
    private static double testDoubleMaxReduction() {
        double fmax = Double.NEGATIVE_INFINITY;
        for (int i = 0; i < doubleArray.length; i++) {
            fmax = Math.max(fmax, doubleArray[i]);
        }
        return fmax;
    }

}