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 |
); |
The return value is the unsigned 64-bit integer result of the right logical shift operation.
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.
Int64ShllMod32, Int64ShraMod32
file: /Techref/os/win/api/win32/func/src/f49_17.htm, 2KB, , updated: 2000/4/7 11:19, local time: 2024/11/4 11:21,
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