intmath.h

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/* KallistiOS ##version##
 
   kos/intmath.h
   Copyright (C) 2026 Paul Cercueil
 
   Integer math helper functions
*/
 
/** \file    kos/intmath.h
    \brief   Functions to help with integer math.
    \ingroup intmath
 
    \author Paul Cercueil
*/
 
#ifndef __KOS_INTMATH_H
#define __KOS_INTMATH_H
 
#include <kos/cdefs.h>
__BEGIN_DECLS
 
#include <stdbool.h>
 
static inline bool is_power_of_two(unsigned int val)
{
    return (val & (val - 1)) == 0;
}
 
static inline unsigned int log2_rdown(unsigned int val)
{
    return 31 - __builtin_clz(val);
}
 
static inline unsigned int log2_rup(unsigned int val)
{
    return log2_rdown(val) + !is_power_of_two(val);
}
 
__END_DECLS
#endif /* __KOS_INTMATH_H */