private void bitrv208neg(float[] a, int offa) {
        float x1r, x1i, x2r, x2i, x3r, x3i, x4r, x4i, x5r, x5i, x6r, x6i, x7r, x7i;

        x1r = a[offa + 2];
        x1i = a[offa + 3];
        x2r = a[offa + 4];
        x2i = a[offa + 5];
        x3r = a[offa + 6];
        x3i = a[offa + 7];
        x4r = a[offa + 8];
        x4i = a[offa + 9];
        x5r = a[offa + 10];
        x5i = a[offa + 11];
        x6r = a[offa + 12];
        x6i = a[offa + 13];
        x7r = a[offa + 14];
        x7i = a[offa + 15];
        a[offa + 2] = x7r;
        a[offa + 3] = x7i;
        a[offa + 4] = x3r;
        a[offa + 5] = x3i;
        a[offa + 6] = x5r;
        a[offa + 7] = x5i;
        a[offa + 8] = x1r;
        a[offa + 9] = x1i;
        a[offa + 10] = x6r;
        a[offa + 11] = x6i;
        a[offa + 12] = x2r;
        a[offa + 13] = x2i;
        a[offa + 14] = x4r;
        a[offa + 15] = x4i;
    }