FreeBSD kernel libkern code
lshrdi3.c
Go to the documentation of this file.
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/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1992, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This software was developed by the Computer Systems Engineering group
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* at Lawrence Berkeley Laboratory under DARPA contract BG 91-66 and
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* contributed to Berkeley.
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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 provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID
(
"$FreeBSD$"
);
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#include <
libkern/quad.h
>
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/*
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* Shift an (unsigned) quad value right (logical shift right).
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*/
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quad_t
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__lshrdi3
(quad_t a,
qshift_t
shift)
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{
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union
uu
aa;
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aa.
q
= a;
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if
(shift >=
LONG_BITS
) {
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aa.
ul
[
L
] = shift >=
QUAD_BITS
? 0 :
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aa.
ul
[
H
] >> (shift -
LONG_BITS
);
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aa.
ul
[
H
] = 0;
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}
else
if
(shift > 0) {
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aa.
ul
[
L
] = (aa.
ul
[
L
] >> shift) |
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(aa.
ul
[
H
] << (
LONG_BITS
- shift));
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aa.
ul
[
H
] >>= shift;
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}
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return
(aa.
q
);
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}
__FBSDID
__FBSDID("$FreeBSD$")
__lshrdi3
quad_t __lshrdi3(quad_t a, qshift_t shift)
Definition:
lshrdi3.c:45
quad.h
QUAD_BITS
#define QUAD_BITS
Definition:
quad.h:85
LONG_BITS
#define LONG_BITS
Definition:
quad.h:86
L
#define L
Definition:
quad.h:78
H
#define H
Definition:
quad.h:77
qshift_t
unsigned int qshift_t
Definition:
quad.h:102
uu
Definition:
quad.h:67
uu::q
quad_t q
Definition:
quad.h:68
uu::ul
u_long ul[2]
Definition:
quad.h:71
libkern
lshrdi3.c
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