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90 lines
2.8 KiB
C++
90 lines
2.8 KiB
C++
/*****************************************************************************
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Copyright (c) 1994, 2013, 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.ic
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Utilities for byte operations
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Created 5/30/1994 Heikki Tuuri
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*******************************************************************/
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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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{
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ut_ad(high <= ULINT32_MASK);
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ut_ad(low <= ULINT32_MASK);
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return(((ib_uint64_t) high) << 32 | low);
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}
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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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ut_ad(align_no > 0);
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ut_ad(ut_is_2pow(align_no));
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return(n & ~((ib_uint64_t) align_no - 1));
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}
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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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{
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ib_uint64_t align_1 = (ib_uint64_t) align_no - 1;
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ut_ad(align_no > 0);
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ut_ad(ut_is_2pow(align_no));
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return((n + align_1) & ~align_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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{
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ut_ad(n < 8 * sizeof(ulint));
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return(1 & (a >> n));
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}
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