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wine
wine-winehq
Commits
2371906a
Commit
2371906a
authored
Apr 22, 2023
by
Alexandre Julliard
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ntdll: Reimplement RtlNumberOfSetBits() to check 32 bits at a time.
parent
504f9d3c
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1 changed file
with
17 additions
and
43 deletions
+17
-43
rtlbitmap.c
dlls/ntdll/rtlbitmap.c
+17
-43
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dlls/ntdll/rtlbitmap.c
View file @
2371906a
...
...
@@ -37,14 +37,6 @@
WINE_DEFAULT_DEBUG_CHANNEL
(
ntdll
);
/* Bits set from LSB to MSB; used as mask for runs < 8 bits */
static
const
BYTE
NTDLL_maskBits
[
8
]
=
{
0
,
1
,
3
,
7
,
15
,
31
,
63
,
127
};
/* Number of set bits for each value of a nibble; used for counting */
static
const
BYTE
NTDLL_nibbleBitCount
[
16
]
=
{
0
,
1
,
1
,
2
,
1
,
2
,
2
,
3
,
1
,
2
,
2
,
3
,
2
,
3
,
3
,
4
};
/* First set bit in a nibble; used for determining least significant bit */
static
const
BYTE
NTDLL_leastSignificant
[
16
]
=
{
0
,
0
,
1
,
0
,
2
,
0
,
1
,
0
,
3
,
0
,
1
,
0
,
2
,
0
,
1
,
0
...
...
@@ -60,6 +52,17 @@ static inline ULONG maskbits( ULONG idx )
return
~
0u
<<
(
idx
&
31
);
}
static
ULONG
popcount
(
ULONG
val
)
{
#if defined(__MINGW32__)
return
__builtin_popcount
(
val
);
#else
val
-=
val
>>
1
&
0x55555555
;
val
=
(
val
&
0x33333333
)
+
(
val
>>
2
&
0x33333333
);
return
((
val
+
(
val
>>
4
))
&
0x0f0f0f0f
)
*
0x01010101
>>
24
;
#endif
}
/*************************************************************************
* RtlInitializeBitMap [NTDLL.@]
*
...
...
@@ -352,45 +355,16 @@ ULONG WINAPI RtlFindClearBitsAndSet(PRTL_BITMAP lpBits, ULONG ulCount, ULONG ulH
/*************************************************************************
* RtlNumberOfSetBits [NTDLL.@]
*
* Find the number of set bits in a bitmap.
*
* PARAMS
* lpBits [I] Bitmap pointer
*
* RETURNS
* The number of set bits.
*/
ULONG
WINAPI
RtlNumberOfSetBits
(
PCRTL_BITMAP
lpBits
)
ULONG
WINAPI
RtlNumberOfSetBits
(
const
RTL_BITMAP
*
bitmap
)
{
ULONG
ulS
et
=
0
;
ULONG
i
,
r
et
=
0
;
TRACE
(
"(%p)
\n
"
,
lpBits
);
if
(
lpBits
)
{
LPBYTE
lpOut
=
(
BYTE
*
)
lpBits
->
Buffer
;
ULONG
ulCount
,
ulRemainder
;
BYTE
bMasked
;
ulCount
=
lpBits
->
SizeOfBitMap
>>
3
;
ulRemainder
=
lpBits
->
SizeOfBitMap
&
0x7
;
while
(
ulCount
--
)
{
ulSet
+=
NTDLL_nibbleBitCount
[
*
lpOut
>>
4
];
ulSet
+=
NTDLL_nibbleBitCount
[
*
lpOut
&
0xf
];
lpOut
++
;
}
for
(
i
=
0
;
i
<
bitmap
->
SizeOfBitMap
/
32
;
i
++
)
ret
+=
popcount
(
bitmap
->
Buffer
[
i
]
);
if
(
bitmap
->
SizeOfBitMap
&
31
)
ret
+=
popcount
(
bitmap
->
Buffer
[
i
]
&
~
maskbits
(
bitmap
->
SizeOfBitMap
));
if
(
ulRemainder
)
{
bMasked
=
*
lpOut
&
NTDLL_maskBits
[
ulRemainder
];
ulSet
+=
NTDLL_nibbleBitCount
[
bMasked
>>
4
];
ulSet
+=
NTDLL_nibbleBitCount
[
bMasked
&
0xf
];
}
}
return
ulSet
;
TRACE
(
"%p -> %lu
\n
"
,
bitmap
,
ret
);
return
ret
;
}
/*************************************************************************
...
...
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