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61fc3e87ba
The includes should make more sense now and not just happen to compile due to headers included from other headers. Used a modified version of IWYU. Modifications were to attribute int8_t and so on to stdint.h instead of sys/types.h and immintrin.h instead of more specific headers. include-what-you-use 0.7 (git:b70df35) based on clang version 3.9.0 (trunk 264728)
56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
#ifndef MATH_H_
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#define MATH_H_
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/*****************************************************************************
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* This file is part of Kvazaar HEVC encoder.
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*
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* Copyright (C) 2013-2015 Tampere University of Technology and others (see
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* COPYING file).
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*
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* Kvazaar is free software: you can redistribute it and/or modify it under
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* the terms of the GNU Lesser General Public License as published by the
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* Free Software Foundation; either version 2.1 of the License, or (at your
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* option) any later version.
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*
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* Kvazaar is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with Kvazaar. If not, see <http://www.gnu.org/licenses/>.
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****************************************************************************/
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/**
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* \file
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* Generic math functions
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*/
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#include "global.h" // IWYU pragma: keep
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static INLINE unsigned kvz_math_floor_log2(unsigned value)
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{
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assert(value > 0);
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unsigned result = 0;
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for (int i = 4; i >= 0; --i) {
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unsigned bits = 1ull << i;
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unsigned shift = value >= (1 << bits) ? bits : 0;
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result += shift;
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value >>= shift;
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}
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return result;
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}
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static INLINE unsigned kvz_math_ceil_log2(unsigned value)
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{
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assert(value > 0);
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// The ceil_log2 is just floor_log2 + 1, except for exact powers of 2.
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return kvz_math_floor_log2(value) + ((value & (value - 1)) ? 1 : 0);
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}
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#endif //CHECKPOINT_H_
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