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/*****************************************************************************
Copyright (c) 1994, 2009, Innobase Oy. All Rights Reserved.
This program is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*****************************************************************************/
/**************************************************************//**
@file include/ut0byte.ic
Utilities for byte operations
Created 5/30/1994 Heikki Tuuri
*******************************************************************/
/*******************************************************//**
Creates a 64-bit integer out of two 32-bit integers.
@return created dulint */
UNIV_INLINE
ib_uint64_t
ut_ull_create(
/*==========*/
ulint high, /*!< in: high-order 32 bits */
ulint low) /*!< in: low-order 32 bits */
{
ut_ad(high <= ULINT32_MASK);
ut_ad(low <= ULINT32_MASK);
return(((ib_uint64_t) high) << 32 | low);
}
/********************************************************//**
Rounds a 64-bit integer downward to a multiple of a power of 2.
@return rounded value */
UNIV_INLINE
ib_uint64_t
ut_uint64_align_down(
/*=================*/
ib_uint64_t n, /*!< in: number to be rounded */
ulint align_no) /*!< in: align by this number
which must be a power of 2 */
{
ut_ad(align_no > 0);
ut_ad(ut_is_2pow(align_no));
return(n & ~((ib_uint64_t) align_no - 1));
}
/********************************************************//**
Rounds ib_uint64_t upward to a multiple of a power of 2.
@return rounded value */
UNIV_INLINE
ib_uint64_t
ut_uint64_align_up(
/*===============*/
ib_uint64_t n, /*!< in: number to be rounded */
ulint align_no) /*!< in: align by this number
which must be a power of 2 */
{
ib_uint64_t align_1 = (ib_uint64_t) align_no - 1;
ut_ad(align_no > 0);
ut_ad(ut_is_2pow(align_no));
return((n + align_1) & ~align_1);
}
/*********************************************************//**
The following function rounds up a pointer to the nearest aligned address.
@return aligned pointer */
UNIV_INLINE
void*
ut_align(
/*=====*/
const void* ptr, /*!< in: pointer */
ulint align_no) /*!< in: align by this number */
{
ut_ad(align_no > 0);
ut_ad(((align_no - 1) & align_no) == 0);
ut_ad(ptr);
ut_ad(sizeof(void*) == sizeof(ulint));
return((void*)((((ulint)ptr) + align_no - 1) & ~(align_no - 1)));
}
/*********************************************************//**
The following function rounds down a pointer to the nearest
aligned address.
@return aligned pointer */
UNIV_INLINE
void*
ut_align_down(
/*==========*/
const void* ptr, /*!< in: pointer */
ulint align_no) /*!< in: align by this number */
{
ut_ad(align_no > 0);
ut_ad(((align_no - 1) & align_no) == 0);
ut_ad(ptr);
ut_ad(sizeof(void*) == sizeof(ulint));
return((void*)((((ulint)ptr)) & ~(align_no - 1)));
}
/*********************************************************//**
The following function computes the offset of a pointer from the nearest
aligned address.
@return distance from aligned pointer */
UNIV_INLINE
ulint
ut_align_offset(
/*============*/
const void* ptr, /*!< in: pointer */
ulint align_no) /*!< in: align by this number */
{
ut_ad(align_no > 0);
ut_ad(((align_no - 1) & align_no) == 0);
ut_ad(ptr);
ut_ad(sizeof(void*) == sizeof(ulint));
return(((ulint)ptr) & (align_no - 1));
}
/*****************************************************************//**
Gets the nth bit of a ulint.
@return TRUE if nth bit is 1; 0th bit is defined to be the least significant */
UNIV_INLINE
ibool
ut_bit_get_nth(
/*===========*/
ulint a, /*!< in: ulint */
ulint n) /*!< in: nth bit requested */
{
ut_ad(n < 8 * sizeof(ulint));
#if TRUE != 1
# error "TRUE != 1"
#endif
return(1 & (a >> n));
}
/*****************************************************************//**
Sets the nth bit of a ulint.
@return the ulint with the bit set as requested */
UNIV_INLINE
ulint
ut_bit_set_nth(
/*===========*/
ulint a, /*!< in: ulint */
ulint n, /*!< in: nth bit requested */
ibool val) /*!< in: value for the bit to set */
{
ut_ad(n < 8 * sizeof(ulint));
#if TRUE != 1
# error "TRUE != 1"
#endif
if (val) {
return(((ulint) 1 << n) | a);
} else {
return(~((ulint) 1 << n) & a);
}
}
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