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mingw-w64-crt
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intrincs
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bitscanrev64.c
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#include
<intrin.h>
unsigned
char
_BitScanReverse64
(
unsigned
long
*
Index
,
unsigned
__int64
Mask
)
{
unsigned
__int64 n
;
__asm__ __volatile__
(
"bsrq %0,%1"
:
"+r"
(
Mask
),
"=rm"
(
n
)
:
:
"memory"
);
*
Index
=
(
unsigned
long
)
n
;
return
(
Mask
!=
0
);
}