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Piyush P Kurur
Glasgow Haskell Compiler
Commits
eec2317e
Commit
eec2317e
authored
6 years ago
by
Peter Trommler
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Efficient pdep implementation
parent
c9884bcb
Branches
improve-pext-pdep
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libraries/ghc-prim/cbits/pdep.c
+90
-17
90 additions, 17 deletions
libraries/ghc-prim/cbits/pdep.c
with
90 additions
and
17 deletions
libraries/ghc-prim/cbits/pdep.c
+
90
−
17
View file @
eec2317e
...
...
@@ -4,40 +4,113 @@
StgWord64
hs_pdep64
(
StgWord64
src
,
StgWord64
mask
)
{
uint64_t
result
=
0
;
uint64_t
m0
,
mk
,
mp
,
mv
,
t
;
uint64_t
array
[
6
];
while
(
1
)
{
// Mask out all but the lowest bit
const
uint64_t
lowest
=
(
-
mask
&
mask
);
m0
=
mask
;
mk
=
~
mask
<<
1
;
if
(
lowest
==
0
)
{
break
;
}
const
uint64_t
lsb
=
(
uint64_t
)((
int64_t
)(
src
<<
63
)
>>
63
);
result
|=
lsb
&
lowest
;
mask
&=
~
lowest
;
src
>>=
1
;
for
(
int
i
=
0
;
i
<
6
;
i
++
)
{
mp
=
mk
^
(
mk
<<
1
);
mp
=
mp
^
(
mp
<<
2
);
mp
=
mp
^
(
mp
<<
4
);
mp
=
mp
^
(
mp
<<
8
);
mp
=
mp
^
(
mp
<<
16
);
mp
=
mp
^
(
mp
<<
32
);
mv
=
mp
&
mask
;
array
[
i
]
=
mv
;
mask
=
(
mask
^
mv
)
|
(
mv
>>
(
1
<<
i
));
mk
=
mk
&
~
mp
;
}
return
result
;
for
(
int
i
=
5
;
i
>=
0
;
i
--
)
{
mv
=
array
[
i
];
t
=
src
<<
(
1
<<
i
);
src
=
(
src
&
~
mv
)
|
(
t
&
mv
);
}
return
src
&
m0
;
}
StgWord
hs_pdep32
(
StgWord
src
,
StgWord
mask
)
{
return
hs_pdep64
(
src
,
mask
);
uint32_t
m0
,
mk
,
mp
,
mv
,
t
;
uint32_t
array
[
5
];
m0
=
mask
;
mk
=
~
mask
<<
1
;
for
(
int
i
=
0
;
i
<
5
;
i
++
)
{
mp
=
mk
^
(
mk
<<
1
);
mp
=
mp
^
(
mp
<<
2
);
mp
=
mp
^
(
mp
<<
4
);
mp
=
mp
^
(
mp
<<
8
);
mp
=
mp
^
(
mp
<<
16
);
mv
=
mp
&
mask
;
array
[
i
]
=
mv
;
mask
=
(
mask
^
mv
)
|
(
mv
>>
(
1
<<
i
));
mk
=
mk
&
~
mp
;
}
for
(
int
i
=
4
;
i
>=
0
;
i
--
)
{
mv
=
array
[
i
];
t
=
src
<<
(
1
<<
i
);
src
=
(
src
&
~
mv
)
|
(
t
&
mv
);
}
return
src
&
m0
;
}
StgWord
hs_pdep16
(
StgWord
src
,
StgWord
mask
)
{
return
hs_pdep64
(
src
,
mask
);
uint16_t
m0
,
mk
,
mp
,
mv
,
t
;
uint16_t
array
[
4
];
m0
=
mask
;
mk
=
~
mask
<<
1
;
for
(
int
i
=
0
;
i
<
4
;
i
++
)
{
mp
=
mk
^
(
mk
<<
1
);
mp
=
mp
^
(
mp
<<
2
);
mp
=
mp
^
(
mp
<<
4
);
mp
=
mp
^
(
mp
<<
8
);
mv
=
mp
&
mask
;
array
[
i
]
=
mv
;
mask
=
(
mask
^
mv
)
|
(
mv
>>
(
1
<<
i
));
mk
=
mk
&
~
mp
;
}
for
(
int
i
=
3
;
i
>=
0
;
i
--
)
{
mv
=
array
[
i
];
t
=
src
<<
(
1
<<
i
);
src
=
(
src
&
~
mv
)
|
(
t
&
mv
);
}
return
src
&
m0
;
}
StgWord
hs_pdep8
(
StgWord
src
,
StgWord
mask
)
{
return
hs_pdep64
(
src
,
mask
);
uint8_t
m0
,
mk
,
mp
,
mv
,
t
;
uint8_t
array
[
3
];
m0
=
mask
;
mk
=
~
mask
<<
1
;
for
(
int
i
=
0
;
i
<
3
;
i
++
)
{
mp
=
mk
^
(
mk
<<
1
);
mp
=
mp
^
(
mp
<<
2
);
mp
=
mp
^
(
mp
<<
4
);
mv
=
mp
&
mask
;
array
[
i
]
=
mv
;
mask
=
(
mask
^
mv
)
|
(
mv
>>
(
1
<<
i
));
mk
=
mk
&
~
mp
;
}
for
(
int
i
=
2
;
i
>=
0
;
i
--
)
{
mv
=
array
[
i
];
t
=
src
<<
(
1
<<
i
);
src
=
(
src
&
~
mv
)
|
(
t
&
mv
);
}
return
src
&
m0
;
}
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