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.TH RtlExtendedMagicDivide 3w "Oct 2012" "Wine API" "Wine API"

.SH NAME
\fBRtlExtendedMagicDivide\fR (NTDLL.@)
.SH SYNOPSIS
#define  RtlExtendedMagicDivide
 (
A )

.SH DESCRIPTION
.PP
Allows replacing a division by a longlong constant with a multiplication by the inverse constant. 

.SH RETURNS
.PP
(dividend * inverse_divisor) >> (\fB64\fR + shift). 

.SH NOTES
.PP
If the divisor of a division is constant, the constants inverse_divisor and shift must be chosen such that inverse_divisor = 2^(\fB64\fR + shift) / divisor. Then we have RtlExtendedMagicDivide(dividend,inverse_divisor,shift) == dividend * inverse_divisor / 2^(\fB64\fR + shift) == dividend / divisor. 
.PP
The Parameter inverse_divisor although defined as \fBLONGLONG\fR is used as \fBULONGLONG\fR. 

.SH IMPLEMENTATION
.PP
Declared in \fB"winternl.h"\fR. 
.PP
Implemented in \fB"dlls/ntdll/large_int.c"\fR.