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_decimal
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libmpdec
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bits.h
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pythoncapi
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cpython
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Modules
/
_decimal
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libmpdec
/
bits.h
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/*
* Copyright (c) 2008-2016 Stefan Krah. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef
BITS_H
#define
BITS_H
#include
"mpdecimal.h"
#include
<stdio.h>
/* Check if n is a power of 2. */
static
inline
int
ispower2
(
mpd_size_t
n
)
{
return
n
!=
0
&&
(
n
&
(
n
-
1
))
==
0
;
}
#if
defined(
ANSI
)
/*
* Return the most significant bit position of n from 0 to 31 (63).
* Assumptions: n != 0.
*/
static
inline
int
mpd_bsr
(
mpd_size_t
n
)
{
int
pos
=
0
;
mpd_size_t
tmp
;
#ifdef
CONFIG_64
tmp
=
n
>>
32
;
if
(
tmp
!=
0
) {
n
=
tmp
;
pos
+=
32
; }
#endif
tmp
=
n
>>
16
;
if
(
tmp
!=
0
) {
n
=
tmp
;
pos
+=
16
; }
tmp
=
n
>>
8
;
if
(
tmp
!=
0
) {
n
=
tmp
;
pos
+=
8
; }
tmp
=
n
>>
4
;
if
(
tmp
!=
0
) {
n
=
tmp
;
pos
+=
4
; }
tmp
=
n
>>
2
;
if
(
tmp
!=
0
) {
n
=
tmp
;
pos
+=
2
; }
tmp
=
n
>>
1
;
if
(
tmp
!=
0
) {
n
=
tmp
;
pos
+=
1
; }
return
pos
+
(
int
)
n
-
1
;
}
/*
* Return the least significant bit position of n from 0 to 31 (63).
* Assumptions: n != 0.
*/
static
inline
int
mpd_bsf
(
mpd_size_t
n
)
{
int
pos
;
#ifdef
CONFIG_64
pos
=
63
;
if
(
n
&
0x00000000FFFFFFFFULL
) {
pos
-=
32
; }
else
{
n
>>=
32
; }
if
(
n
&
0x000000000000FFFFULL
) {
pos
-=
16
; }
else
{
n
>>=
16
; }
if
(
n
&
0x00000000000000FFULL
) {
pos
-=
8
; }
else
{
n
>>=
8
; }
if
(
n
&
0x000000000000000FULL
) {
pos
-=
4
; }
else
{
n
>>=
4
; }
if
(
n
&
0x0000000000000003ULL
) {
pos
-=
2
; }
else
{
n
>>=
2
; }
if
(
n
&
0x0000000000000001ULL
) {
pos
-=
1
; }
#else
pos
=
31
;
if
(
n
&
0x000000000000FFFFUL
) {
pos
-=
16
; }
else
{
n
>>=
16
; }
if
(
n
&
0x00000000000000FFUL
) {
pos
-=
8
; }
else
{
n
>>=
8
; }
if
(
n
&
0x000000000000000FUL
) {
pos
-=
4
; }
else
{
n
>>=
4
; }
if
(
n
&
0x0000000000000003UL
) {
pos
-=
2
; }
else
{
n
>>=
2
; }
if
(
n
&
0x0000000000000001UL
) {
pos
-=
1
; }
#endif
return
pos
;
}
/* END ANSI */
#elif
defined(
ASM
)
/*
* Bit scan reverse. Assumptions: a != 0.
*/
static
inline
int
mpd_bsr
(
mpd_size_t
a
)
{
mpd_size_t
retval
;
__asm__ (
#ifdef
CONFIG_64
"bsrq %1, %0\n\t"
#else
"bsr %1, %0\n\t"
#endif
:
"=r"
(
retval
)
:
"r"
(
a
)
:
"cc"
);
return
(
int
)
retval
;
}
/*
* Bit scan forward. Assumptions: a != 0.
*/
static
inline
int
mpd_bsf
(
mpd_size_t
a
)
{
mpd_size_t
retval
;
__asm__ (
#ifdef
CONFIG_64
"bsfq %1, %0\n\t"
#else
"bsf %1, %0\n\t"
#endif
:
"=r"
(
retval
)
:
"r"
(
a
)
:
"cc"
);
return
(
int
)
retval
;
}
/* END ASM */
#elif
defined(
MASM
)
#include
<intrin.h>
/*
* Bit scan reverse. Assumptions: a != 0.
*/
static
inline
int
__cdecl
mpd_bsr
(
mpd_size_t
a
)
{
unsigned long
retval
;
#ifdef
CONFIG_64
_BitScanReverse64
(
&
retval
,
a
);
#else
_BitScanReverse
(
&
retval
,
a
);
#endif
return
(
int
)
retval
;
}
/*
* Bit scan forward. Assumptions: a != 0.
*/
static
inline
int
__cdecl
mpd_bsf
(
mpd_size_t
a
)
{
unsigned long
retval
;
#ifdef
CONFIG_64
_BitScanForward64
(
&
retval
,
a
);
#else
_BitScanForward
(
&
retval
,
a
);
#endif
return
(
int
)
retval
;
}
/* END MASM (_MSC_VER) */
#else
#error
"missing preprocessor definitions"
#endif
/* BSR/BSF */
#endif
/* BITS_H */
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