RtlExtendedMagicDivide(3w)
NAME
RtlExtendedMagicDivide (NTDLL.@)
SYNOPSIS
#define RtlExtendedMagicDivide ( A )
DESCRIPTION
Allows replacing a division by a longlong constant with a multiplication by the inverse constant.
RETURNS
(dividend * inverse_divisor) >> (64 + shift).
NOTES
If the divisor of a division is constant, the constants inverse_divisor
and shift must be chosen such that inverse_divisor = 2^(64 + shift) /
divisor. Then we have RtlExtendedMagicDivide(dividend,inverse_divisor,shift) == dividend * inverse_divisor / 2^(64 + shift) == dividend /
divisor.
The Parameter inverse_divisor although defined as LONGLONG is used as
ULONGLONG.
IMPLEMENTATION
Defined in "winternl.h".
- Implemented in "build/buildd-wine-unstable_1.1.32-1+b1-amd64-KnxYu0/wine-unstable-1.1.32/build32/dlls/ntdll/large_int.c".