mirror of
https://github.com/isar/libmdbx.git
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0f8b2ff399
Related to https://github.com/leo-yuriev/libmdbx/issues/62 Change-Id: I5fee861582987cc11a648a3365b19c28e493317d
361 lines
10 KiB
C++
361 lines
10 KiB
C++
/*
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* Copyright 2017-2019 Leonid Yuriev <leo@yuriev.ru>
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* and other libmdbx authors: please see AUTHORS file.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted only as authorized by the OpenLDAP
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* Public License.
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*
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* A copy of this license is available in the file LICENSE in the
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* top-level directory of the distribution or, alternatively, at
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* <http://www.OpenLDAP.org/license.html>.
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*/
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#pragma once
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#include "base.h"
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#if !defined(__BYTE_ORDER__) || !defined(__ORDER_LITTLE_ENDIAN__) || \
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!defined(__ORDER_BIG_ENDIAN__)
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#error __BYTE_ORDER__ should be defined.
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#endif
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#if __BYTE_ORDER__ != __ORDER_LITTLE_ENDIAN__ && \
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__BYTE_ORDER__ != __ORDER_BIG_ENDIAN__
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#error Unsupported byte order.
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#endif
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#if __GNUC_PREREQ(4, 4) || defined(__clang__)
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#ifndef bswap64
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#define bswap64(v) __builtin_bswap64(v)
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#endif
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#ifndef bswap32
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#define bswap32(v) __builtin_bswap32(v)
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#endif
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#if (__GNUC_PREREQ(4, 8) || __has_builtin(__builtin_bswap16)) && \
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!defined(bswap16)
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#define bswap16(v) __builtin_bswap16(v)
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#endif
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#elif defined(_MSC_VER)
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#if _MSC_FULL_VER < 190024215
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#pragma message( \
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"It is recommended to use Visual Studio 2015 (MSC 19.0) or newer.")
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#endif
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#define bswap64(v) _byteswap_uint64(v)
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#define bswap32(v) _byteswap_ulong(v)
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#define bswap16(v) _byteswap_ushort(v)
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#define rot64(v, s) _rotr64(v, s)
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#define rot32(v, s) _rotr(v, s)
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#if defined(_M_ARM64) || defined(_M_X64) || defined(_M_IA64)
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#pragma intrinsic(_umul128)
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#define mul_64x64_128(a, b, ph) _umul128(a, b, ph)
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#pragma intrinsic(__umulh)
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#define mul_64x64_high(a, b) __umulh(a, b)
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#endif
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#if defined(_M_IX86)
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#pragma intrinsic(__emulu)
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#define mul_32x32_64(a, b) __emulu(a, b)
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#elif defined(_M_ARM)
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#define mul_32x32_64(a, b) _arm_umull(a, b)
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#endif
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#endif /* compiler */
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#ifndef bswap64
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#ifdef __bswap_64
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#define bswap64(v) __bswap_64(v)
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#else
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static __inline uint64_t bswap64(uint64_t v) {
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return v << 56 | v >> 56 | ((v << 40) & UINT64_C(0x00ff000000000000)) |
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((v << 24) & UINT64_C(0x0000ff0000000000)) |
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((v << 8) & UINT64_C(0x000000ff00000000)) |
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((v >> 8) & UINT64_C(0x00000000ff0000000)) |
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((v >> 24) & UINT64_C(0x0000000000ff0000)) |
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((v >> 40) & UINT64_C(0x000000000000ff00));
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}
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#endif
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#endif /* bswap64 */
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#ifndef bswap32
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#ifdef __bswap_32
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#define bswap32(v) __bswap_32(v)
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#else
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static __inline uint32_t bswap32(uint32_t v) {
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return v << 24 | v >> 24 | ((v << 8) & UINT32_C(0x00ff0000)) |
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((v >> 8) & UINT32_C(0x0000ff00));
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}
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#endif
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#endif /* bswap32 */
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#ifndef bswap16
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#ifdef __bswap_16
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#define bswap16(v) __bswap_16(v)
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#else
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static __inline uint16_t bswap16(uint16_t v) { return v << 8 | v >> 8; }
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#endif
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#endif /* bswap16 */
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#define is_byteorder_le() (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__)
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#define is_byteorder_be() (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
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#ifndef htole16
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#define htobe16(v) bswap16(v)
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#define htole16(v) (v)
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#define be16toh(v) bswap16(v)
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#define le16toh(v) (v)
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#else
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#define htobe16(v) (v)
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#define htole16(v) bswap16(v)
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#define be16toh(v) (v)
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#define le16toh(v) bswap16(v)
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#endif
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#endif /* htole16 */
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#ifndef htole32
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#define htobe32(v) bswap32(v)
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#define htole32(v) (v)
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#define be32toh(v) bswap32(v)
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#define le32toh(v) (v)
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#else
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#define htobe32(v) (v)
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#define htole32(v) bswap32(v)
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#define be32toh(v) (v)
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#define le32toh(v) bswap32(v)
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#endif
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#endif /* htole32 */
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#ifndef htole64
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#define htobe64(v) bswap64(v)
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#define htole64(v) (v)
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#define be64toh(v) bswap64(v)
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#define le64toh(v) (v)
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#else
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#define htobe64(v) (v)
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#define htole64(v) bswap_64(v)
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#define be64toh(v) (v)
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#define le64toh(v) bswap_64(v)
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#endif
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#endif /* htole64 */
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namespace unaligned {
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template <typename T> static __inline T load(const void *ptr) {
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#if defined(_MSC_VER) && \
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(defined(_M_ARM64) || defined(_M_X64) || defined(_M_IA64))
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return *(const T __unaligned *)ptr;
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#elif MDBX_UNALIGNED_OK
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return *(const T *)ptr;
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#else
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T local;
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#if defined(__GNUC__) || defined(__clang__)
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__builtin_memcpy(&local, (const T *)ptr, sizeof(T));
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#else
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memcpy(&local, (const T *)ptr, sizeof(T));
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#endif /* __GNUC__ || __clang__ */
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return local;
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#endif /* MDBX_UNALIGNED_OK */
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}
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template <typename T> static __inline void store(void *ptr, const T &value) {
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#if defined(_MSC_VER) && \
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(defined(_M_ARM64) || defined(_M_X64) || defined(_M_IA64))
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*((T __unaligned *)ptr) = value;
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#elif MDBX_UNALIGNED_OK
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*(volatile T *)ptr = value;
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#else
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#if defined(__GNUC__) || defined(__clang__)
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__builtin_memcpy(ptr, &value, sizeof(T));
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#else
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memcpy(ptr, &value, sizeof(T));
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#endif /* __GNUC__ || __clang__ */
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#endif /* MDBX_UNALIGNED_OK */
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}
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} /* namespace unaligned */
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//-----------------------------------------------------------------------------
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#ifndef rot64
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static __inline uint64_t rot64(uint64_t v, unsigned s) {
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return (v >> s) | (v << (64 - s));
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}
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#endif /* rot64 */
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static __inline bool is_power2(size_t x) { return (x & (x - 1)) == 0; }
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#undef roundup2
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static __inline size_t roundup2(size_t value, size_t granularity) {
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assert(is_power2(granularity));
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return (value + granularity - 1) & ~(granularity - 1);
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}
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//-----------------------------------------------------------------------------
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static __inline void memory_barrier(void) {
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#if __has_extension(c_atomic) || __has_extension(cxx_atomic)
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__c11_atomic_thread_fence(__ATOMIC_SEQ_CST);
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#elif defined(__ATOMIC_SEQ_CST)
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__atomic_thread_fence(__ATOMIC_SEQ_CST);
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#elif defined(__clang__) || defined(__GNUC__)
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__sync_synchronize();
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#elif defined(_MSC_VER)
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MemoryBarrier();
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#elif defined(__INTEL_COMPILER) /* LY: Intel Compiler may mimic GCC and MSC */
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#if defined(__ia64__) || defined(__ia64) || defined(_M_IA64)
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__mf();
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#elif defined(__ia32__)
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_mm_mfence();
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#else
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#error "Unknown target for Intel Compiler, please report to us."
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#endif
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#elif defined(__SUNPRO_C) || defined(__sun) || defined(sun)
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__machine_rw_barrier();
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#elif (defined(_HPUX_SOURCE) || defined(__hpux) || defined(__HP_aCC)) && \
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(defined(HP_IA64) || defined(__ia64))
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_Asm_mf();
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#elif defined(_AIX) || defined(__ppc__) || defined(__powerpc__) || \
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defined(__ppc64__) || defined(__powerpc64__)
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__lwsync();
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#else
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#error "Could not guess the kind of compiler, please report to us."
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#endif
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}
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static __inline void cpu_relax() {
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#if defined(__ia32__)
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_mm_pause();
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#elif defined(_WIN32) || defined(_WIN64) || defined(_WINDOWS) || \
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defined(YieldProcessor)
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YieldProcessor();
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#else
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/* nope */
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#endif
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}
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//-----------------------------------------------------------------------------
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struct simple_checksum {
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uint64_t value;
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simple_checksum() : value(0) {}
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void push(const uint32_t &data) {
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value += data * UINT64_C(9386433910765580089) + 1;
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value ^= value >> 41;
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value *= UINT64_C(0xBD9CACC22C6E9571);
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}
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void push(const uint64_t &data) {
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push((uint32_t)data);
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push((uint32_t)(data >> 32));
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}
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void push(const bool data) {
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push(data ? UINT32_C(0x780E) : UINT32_C(0xFA18E));
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}
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void push(const void *ptr, size_t bytes) {
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const uint8_t *data = (const uint8_t *)ptr;
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for (size_t i = 0; i < bytes; ++i)
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push((uint32_t)data[i]);
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}
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void push(const double &data) { push(&data, sizeof(double)); }
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void push(const char *cstr) { push(cstr, strlen(cstr)); }
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void push(const std::string &str) { push(str.data(), str.size()); }
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void push(unsigned salt, const MDBX_val &val) {
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push(unsigned(val.iov_len));
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push(salt);
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push(val.iov_base, val.iov_len);
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}
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#if defined(_WIN32) || defined(_WIN64) || defined(_WINDOWS)
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void push(const HANDLE &handle) { push(&handle, sizeof(handle)); }
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#endif /* _WINDOWS */
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};
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std::string data2hex(const void *ptr, size_t bytes, simple_checksum &checksum);
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bool hex2data(const char *hex_begin, const char *hex_end, void *ptr,
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size_t bytes, simple_checksum &checksum);
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bool is_samedata(const MDBX_val *a, const MDBX_val *b);
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std::string format(const char *fmt, ...);
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uint64_t entropy_ticks(void);
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uint64_t entropy_white(void);
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static inline uint64_t bleach64(uint64_t v) {
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// Tommy Ettinger, https://www.blogger.com/profile/04953541827437796598
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// http://mostlymangling.blogspot.com/2019/01/better-stronger-mixer-and-test-procedure.html
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v ^= rot64(v, 25) ^ rot64(v, 50);
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v *= UINT64_C(0xA24BAED4963EE407);
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v ^= rot64(v, 24) ^ rot64(v, 49);
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v *= UINT64_C(0x9FB21C651E98DF25);
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return v ^ v >> 28;
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}
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static inline uint32_t bleach32(uint32_t x) {
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// https://github.com/skeeto/hash-prospector
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// exact bias: 0.17353355999581582
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x ^= x >> 16;
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x *= UINT32_C(0x7feb352d);
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x ^= 0x3027C563 ^ (x >> 15);
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x *= UINT32_C(0x846ca68b);
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x ^= x >> 16;
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return x;
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}
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static inline uint64_t prng64_map1_careless(uint64_t state) {
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return state * UINT64_C(6364136223846793005) + 1;
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}
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static inline uint64_t prng64_map2_careless(uint64_t state) {
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return (state + UINT64_C(1442695040888963407)) *
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UINT64_C(6364136223846793005);
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}
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static inline uint64_t prng64_map1_white(uint64_t state) {
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return bleach64(prng64_map1_careless(state));
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}
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static inline uint64_t prng64_map2_white(uint64_t state) {
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return bleach64(prng64_map2_careless(state));
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}
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static inline uint64_t prng64_careless(uint64_t &state) {
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state = prng64_map1_careless(state);
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return state;
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}
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static inline double u64_to_double1(uint64_t v) {
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union {
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uint64_t u64;
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double d;
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} casting;
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casting.u64 = UINT64_C(0x3ff) << 52 | (v >> 12);
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assert(casting.d >= 1.0 && casting.d < 2.0);
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return casting.d - 1.0;
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}
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uint64_t prng64_white(uint64_t &state);
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uint32_t prng32(uint64_t &state);
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void prng_fill(uint64_t &state, void *ptr, size_t bytes);
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void prng_seed(uint64_t seed);
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uint32_t prng32(void);
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uint64_t prng64(void);
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void prng_fill(void *ptr, size_t bytes);
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bool flipcoin();
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bool flipcoin_x2();
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bool jitter(unsigned probability_percent);
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void jitter_delay(bool extra = false);
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