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/*

 * @test

 * @bug 8080190

 * @key regression

 * @summary Test that the rotate distance used in the rotate instruction is properly masked with 0x1f

 * @run main/othervm -Xbatch -XX:-UseOnStackReplacement IntRotateWithImmediate

 * @author volker.simonis@gmail.com

 */

public class IntRotateWithImmediate {

  // This is currently the same as Integer.rotateRight()

  static int rotateRight(int i, int distance) {

    // On some architectures (i.e. x86_64 and ppc64) the following computation is

    // matched in the .ad file into a single MachNode which emmits a single rotate

    // machine instruction. It is important that the shift amount is masked to match

    // corresponding immediate width in the native instruction. On x86_64 the rotate

    // left instruction ('rol') encodes an 8-bit immediate while the corresponding

    // 'rotlwi' instruction on Power only encodes a 5-bit immediate.

    return ((i >>> distance) | (i << -distance));

  }

  static int compute(int x) {

    return rotateRight(x, 3);

  }

  public static void main(String args[]) {

    int val = 4096;

    int firstResult = compute(val);

    for (int i = 0; i < 100000; i++) {

      int newResult = compute(val);

      if (firstResult != newResult) {

        throw new InternalError(firstResult + " != " + newResult);

      }

    }

    System.out.println("OK");

  }

}