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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * 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 com.oracle.graal.compiler.hsail.test;

import org.junit.*;

import com.oracle.graal.compiler.hsail.test.infra.*;

/**
 * Tests intrinsic for calls to Math.floor(). Generates a floor_f64 instruction.
 */
public class DoubleFloorTest extends GraalKernelTester {

    static final int num = 40;
    // Output array storing the results.
    @Result protected double[] outArray = new double[num];

    /**
     * The static "kernel" method we will be testing. This method calls Math.floor() on an element
     * of an input array and writes the result to the corresponding index of an output array. By
     * convention the gid is the last parameter.
     * 
     * @param out the output array.
     * @param ina the input array.
     * @param gid the parameter used to index into the input and output arrays.
     */
    public static void run(double[] out, double[] ina, int gid) {
        out[gid] = Math.floor(ina[gid]);
    }

    /**
     * Tests the HSAIL code generated for this unit test by comparing the result of executing this
     * code with the result of executing a sequential Java version of this unit test.
     */
    @Test
    public void test() {
        super.testGeneratedHsail();
    }

    /**
     * Initializes the input and output arrays passed to the run routine.
     * 
     * @param in the input array.
     */
    void setupArrays(double[] in) {
        // Initialize input array with a mix of positive and negative values and any corner cases.
        for (int i = 0; i < num; i++) {
            if (i == 0) {
                in[i] = 0.0;
            } else if (i == 1) {
                in[i] = -0.0;
            } else if (i == 2) {
                in[i] = Double.NaN;
            } else if (i == 3) {
                in[i] = Double.NEGATIVE_INFINITY;
            } else if (i == 4) {
                in[i] = Double.POSITIVE_INFINITY;
            } else {
                in[i] = i < num / 2 ? i + 0.5 : -i - 0.5;
            }
            outArray[i] = 0;
        }
    }

    /**
     * Dispatches the HSAIL kernel for this test case.
     */
    @Override
    public void runTest() {
        double[] inArray = new double[num];
        setupArrays(inArray);
        dispatchMethodKernel(num, outArray, inArray);
    }
}
