test/hotspot/jtreg/compiler/runtime/safepoints/TestRegisterRestoring.java

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/**
 * @test
 * @bug 8148490
 * @summary Test correct saving and restoring of vector registers at safepoints.
 *
 * @run main/othervm -Xbatch -XX:-TieredCompilation
 *                   -XX:+UnlockDiagnosticVMOptions -XX:+SafepointALot
 *                   -XX:CompileCommand=exclude,compiler.runtime.safepoints.TestRegisterRestoring::main
 *                   compiler.runtime.safepoints.TestRegisterRestoring
 */

package compiler.runtime.safepoints;

public class TestRegisterRestoring {
    public static void main(String args[]) throws Exception {
        // Initialize
        float[] array = new float[100];
        for (int i = 0; i < array.length; ++i) {
            array[i] = 0;
        }
        // Test
        for (int j = 0; j < 20_000; ++j) {
            increment(array);
            // Check result
            for (int i = 0; i < array.length; i++) {
                if (array[i] != 10_000) {
                    throw new RuntimeException("Test failed: array[" + i + "] = " + array[i] + " but should be 10.000");
                }
                array[i] = 0;
            }
        }
    }

    static void increment(float[] array) {
        // Loop with safepoint
        for (long l = 0; l < 10_000; l++) {
            // Vectorized loop
            for (int i = 0; i < array.length; ++i) {
                array[i] += 1;
            }
        }
    }
}