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Overview |
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Group |
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Quick Info
Windows NT
| Yes
| Win95
| Yes
| Win32s
| No
| Import Library
| -
| Header File
| winnt.h
| Unicode
| No
| Platform Notes
| None
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Int64ShrlMod32
The Int64ShrlMod32 function performs a right logical shift operation on an unsigned 64-bit
integer value. The function provides improved shifting code for right logical shifts
where the shift count is in the range 0  31.
DWORDLONG Int64ShrlMod32(
DWORDLONG Value,
| // specifies unsigned 64-bit integer to shift right logically
| DWORD ShiftCount
| // specifies a shift count in the range 0 31
| );
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Parameters
Value
Specifies the unsigned 64-bit integer to be shifted.
ShiftCount
Specifies a shift count in the range 0 31.
Return Values
The return value is the unsigned 64-bit integer result of the right logical
shift operation.
Remarks
The shift count is the number of bit positions that the value's bits move.
In a right logical shift operation on an unsigned value, the value's bits move
to the right, and vacated bits on the left side of the value are set to zero.
A compiler can generate optimal code for a right logical shift operation when
the shift count is a constant. However, if the shift count is a variable whose
range of values is unknown, the compiler must assume the worst case, leading to
non-optimal code: code that calls a subroutine, or code that is inline but
branches. By restricting the shift count to the range 0 31, the Int64ShrlMod32 function lets the compiler generate optimal or near-optimal code.
Please note that the Int64ShrlMod32 function's Value parameter and return value are 64-bit values, not LARGE_INTEGER structures.
See Also
Int64ShllMod32, Int64ShraMod32
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