/*  libFLAC - Free Lossless Audio Codec library
    Copyright (C) 2001-2009  Josh Coalson
    Copyright (C) 2011-2016  Xiph.Org Foundation

    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions
    are met:

    - Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.

    - Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in the
    documentation and/or other materials provided with the distribution.

    - Neither the name of the Xiph.org Foundation nor the names of its
    contributors may be used to endorse or promote products derived from
    this software without specific prior written permission.

    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
    ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
    LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
    A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
    CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
    EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
    PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
    PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
    LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
    NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

//#ifdef HAVE_CONFIG_H
#  include "config.h"
//#endif

#pragma GCC optimize ("O3")

#include "private/bitmath.h"

/*  An example of what FLAC__bitmath_silog2() computes:

    silog2(-10) = 5
    silog2(- 9) = 5
    silog2(- 8) = 4
    silog2(- 7) = 4
    silog2(- 6) = 4
    silog2(- 5) = 4
    silog2(- 4) = 3
    silog2(- 3) = 3
    silog2(- 2) = 2
    silog2(- 1) = 2
    silog2(  0) = 0
    silog2(  1) = 2
    silog2(  2) = 3
    silog2(  3) = 3
    silog2(  4) = 4
    silog2(  5) = 4
    silog2(  6) = 4
    silog2(  7) = 4
    silog2(  8) = 5
    silog2(  9) = 5
    silog2( 10) = 5
*/
uint32_t FLAC__bitmath_silog2(FLAC__int64 v) {
    if (v == 0) {
        return 0;
    }

    if (v == -1) {
        return 2;
    }

    v = (v < 0) ? (-(v + 1)) : v;
    return FLAC__bitmath_ilog2_wide(v) + 2;
}
