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/* Copyright (c) 2017, ARM Limited. All rights reserved.
*
* Copyright (c) 2017, Linaro Limited
* All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#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
*/
/* Find a suitable data type that supports lock-free atomic operations */
#if defined(__aarch64__) && defined(__SIZEOF_INT128__) && \
__SIZEOF_INT128__ == 16
#define LOCKFREE16
typedef __int128 bitset_t;
#define ATOM_BITSET_SIZE (CHAR_BIT * __SIZEOF_INT128__)
#elif __GCC_ATOMIC_LLONG_LOCK_FREE == 2 && \
__SIZEOF_LONG_LONG__ != __SIZEOF_LONG__
typedef unsigned long long bitset_t;
#define ATOM_BITSET_SIZE (CHAR_BIT * __SIZEOF_LONG_LONG__)
#elif __GCC_ATOMIC_LONG_LOCK_FREE == 2 && __SIZEOF_LONG__ != __SIZEOF_INT__
typedef unsigned long bitset_t;
#define ATOM_BITSET_SIZE (CHAR_BIT * __SIZEOF_LONG__)
#elif __GCC_ATOMIC_INT_LOCK_FREE == 2
typedef unsigned int bitset_t;
#define ATOM_BITSET_SIZE (CHAR_BIT * __SIZEOF_INT__)
#else
/* Target does not support lock-free atomic operations */
typedef unsigned int bitset_t;
#define ATOM_BITSET_SIZE (CHAR_BIT * __SIZEOF_INT__)
#endif
#if ATOM_BITSET_SIZE <= 32
static inline bitset_t bitset_mask(uint32_t bit)
{
return 1UL << bit;
}
/* Return first-bit-set with StdC ffs() semantics */
static inline uint32_t bitset_ffs(bitset_t b)
{
return __builtin_ffsl(b);
}
/* Load-exclusive with memory ordering */
static inline bitset_t bitset_monitor(bitset_t *bs, int mo)
{
return monitor32(bs, mo);
}
#elif ATOM_BITSET_SIZE <= 64
static inline bitset_t bitset_mask(uint32_t bit)
{
return 1ULL << bit;
}
/* Return first-bit-set with StdC ffs() semantics */
static inline uint32_t bitset_ffs(bitset_t b)
{
return __builtin_ffsll(b);
}
/* Load-exclusive with memory ordering */
static inline bitset_t bitset_monitor(bitset_t *bs, int mo)
{
return monitor64(bs, mo);
}
#elif ATOM_BITSET_SIZE <= 128
static inline bitset_t bitset_mask(uint32_t bit)
{
if (bit < 64)
return 1ULL << bit;
else
return (unsigned __int128)(1ULL << (bit - 64)) << 64;
}
/* 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;
}
/* Load-exclusive with memory ordering */
static inline bitset_t bitset_monitor(bitset_t *bs, int mo)
{
return monitor128(bs, mo);
}
#else
#error Unsupported size of bit sets (ATOM_BITSET_SIZE)
#endif
/* Atomic load with memory ordering */
static inline bitset_t atom_bitset_load(bitset_t *bs, int mo)
{
#ifdef LOCKFREE16
return __lockfree_load_16(bs, mo);
#else
return __atomic_load_n(bs, mo);
#endif
}
/* Atomic bit set with memory ordering */
static inline void atom_bitset_set(bitset_t *bs, uint32_t bit, int mo)
{
#ifdef LOCKFREE16
(void)__lockfree_fetch_or_16(bs, bitset_mask(bit), mo);
#else
(void)__atomic_fetch_or(bs, bitset_mask(bit), mo);
#endif
}
/* Atomic bit clear with memory ordering */
static inline void atom_bitset_clr(bitset_t *bs, uint32_t bit, int mo)
{
#ifdef LOCKFREE16
(void)__lockfree_fetch_and_16(bs, ~bitset_mask(bit), mo);
#else
(void)__atomic_fetch_and(bs, ~bitset_mask(bit), mo);
#endif
}
/* Atomic exchange with memory ordering */
static inline bitset_t atom_bitset_xchg(bitset_t *bs, bitset_t neu, int mo)
{
#ifdef LOCKFREE16
return __lockfree_exchange_16(bs, neu, mo);
#else
return __atomic_exchange_n(bs, neu, mo);
#endif
}
/* Atomic compare&exchange with memory ordering */
static inline bitset_t atom_bitset_cmpxchg(bitset_t *bs, bitset_t *old,
bitset_t neu, bool weak,
int mo_success, int mo_failure)
{
#ifdef LOCKFREE16
return __lockfree_compare_exchange_16(
bs, old, neu, weak, mo_success, mo_failure);
#else
return __atomic_compare_exchange_n(
bs, old, neu, weak, mo_success, mo_failure);
#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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