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107 lines
3.4 KiB
C
107 lines
3.4 KiB
C
/*****************************************************************************
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Copyright (c) 1994, 2016, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2019, 2020, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/******************************************************************//**
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@file include/ut0byte.h
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Utilities for byte operations
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Created 1/20/1994 Heikki Tuuri
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***********************************************************************/
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#ifndef ut0byte_h
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#define ut0byte_h
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#include "univ.i"
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/*******************************************************//**
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Creates a 64-bit integer out of two 32-bit integers.
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@return created integer */
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UNIV_INLINE
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ib_uint64_t
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ut_ull_create(
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/*==========*/
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ulint high, /*!< in: high-order 32 bits */
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ulint low) /*!< in: low-order 32 bits */
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MY_ATTRIBUTE((const));
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/********************************************************//**
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Rounds a 64-bit integer downward to a multiple of a power of 2.
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@return rounded value */
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UNIV_INLINE
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ib_uint64_t
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ut_uint64_align_down(
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/*=================*/
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ib_uint64_t n, /*!< in: number to be rounded */
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ulint align_no); /*!< in: align by this number
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which must be a power of 2 */
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/********************************************************//**
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Rounds ib_uint64_t upward to a multiple of a power of 2.
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@return rounded value */
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UNIV_INLINE
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ib_uint64_t
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ut_uint64_align_up(
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/*===============*/
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ib_uint64_t n, /*!< in: number to be rounded */
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ulint align_no); /*!< in: align by this number
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which must be a power of 2 */
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/** Round down a pointer to the nearest aligned address.
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@param ptr pointer
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@param alignment a power of 2
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@return aligned pointer */
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static inline void *ut_align_down(void *ptr, size_t alignment)
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{
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ut_ad(alignment > 0);
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ut_ad(ut_is_2pow(alignment));
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ut_ad(ptr);
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static_assert(sizeof ptr == sizeof(size_t), "compatibility");
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return reinterpret_cast<void*>(reinterpret_cast<size_t>(ptr) &
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~(alignment - 1));
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}
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static inline const void *ut_align_down(const void *ptr, size_t alignment)
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{
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return ut_align_down(const_cast<void*>(ptr), alignment);
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}
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/** Compute the offset of a pointer from the nearest aligned address.
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@param ptr pointer
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@param alignment a power of 2
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@return distance from aligned pointer */
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inline size_t ut_align_offset(const void *ptr, size_t alignment)
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{
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ut_ad(alignment > 0);
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ut_ad(ut_is_2pow(alignment));
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ut_ad(ptr);
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return reinterpret_cast<size_t>(ptr) & (alignment - 1);
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}
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/*****************************************************************//**
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Gets the nth bit of a ulint.
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@return TRUE if nth bit is 1; 0th bit is defined to be the least significant */
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UNIV_INLINE
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ibool
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ut_bit_get_nth(
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/*===========*/
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ulint a, /*!< in: ulint */
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ulint n); /*!< in: nth bit requested */
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#include "ut0byte.inl"
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#endif
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