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/* SPDX-License-Identifier: BSD-3-Clause
* Copyright (c) 2017 ARM Limited
* Copyright (c) 2017-2018 Linaro Limited
*/
#ifndef _ODP_BITSET_H_
#define _ODP_BITSET_H_
#include <odp_cpu.h>
#include <limits.h>
/******************************************************************************
* bitset abstract data type
*****************************************************************************/
/* This could be a struct of scalars to support larger bit sets */
/*
* Size of atomic bit set. This limits the max number of threads,
* scheduler groups and reorder windows. On ARMv8/64-bit and x86-64, the
* (lock-free) max is 128
*/
#if ATOM_BITSET_SIZE <= 32
/* Return first-bit-set with StdC ffs() semantics */
static inline uint32_t bitset_ffs(bitset_t b)
{
return __builtin_ffsl(b);
}
#elif ATOM_BITSET_SIZE <= 64
/* Return first-bit-set with StdC ffs() semantics */
static inline uint32_t bitset_ffs(bitset_t b)
{
return __builtin_ffsll(b);
}
#elif ATOM_BITSET_SIZE <= 128
/* Return first-bit-set with StdC ffs() semantics */
static inline uint32_t bitset_ffs(bitset_t b)
{
if ((uint64_t)b != 0)
return __builtin_ffsll((uint64_t)b);
else if ((b >> 64) != 0)
return __builtin_ffsll((uint64_t)(b >> 64)) + 64;
else
return 0;
}
#else
#error Unsupported size of bit sets (ATOM_BITSET_SIZE)
#endif
/* Return a & ~b */
static inline bitset_t bitset_andn(bitset_t a, bitset_t b)
{
return a & ~b;
}
static inline bool bitset_is_eql(bitset_t a, bitset_t b)
{
return a == b;
}
static inline bitset_t bitset_clr(bitset_t bs, uint32_t bit)
{
return bs & ~bitset_mask(bit);
}
static inline bitset_t bitset_set(bitset_t bs, uint32_t bit)
{
return bs | bitset_mask(bit);
}
static inline bitset_t bitset_null(void)
{
return 0U;
}
static inline bool bitset_is_null(bitset_t a)
{
return a == 0U;
}
static inline bool bitset_is_set(bitset_t a, uint32_t bit)
{
return (a & bitset_mask(bit)) != 0;
}
#endif
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