// Copyright (c) 2009-2011, Tor M. Aamodt, George L. Yuan
// The University of British Columbia
// All rights reserved.
//
// 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 University of British Columbia 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 COPYRIGHT HOLDER 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
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "gpu-misc.h"

unsigned int LOGB2(unsigned int v) {
  unsigned int shift;
  unsigned int r;

  r = 0;

  shift = ((v & 0xFFFF0000) != 0) << 4;
  v >>= shift;
  r |= shift;
  shift = ((v & 0xFF00) != 0) << 3;
  v >>= shift;
  r |= shift;
  shift = ((v & 0xF0) != 0) << 2;
  v >>= shift;
  r |= shift;
  shift = ((v & 0xC) != 0) << 1;
  v >>= shift;
  r |= shift;
  shift = ((v & 0x2) != 0) << 0;
  v >>= shift;
  r |= shift;

  return r;
}