Source code of Windows XP (NT5)
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page ,132;---------------------------Module-Header-------------------------------;; Module Name: MULDIV32;; Copyright (c) 1987 Microsoft Corporation;-----------------------------------------------------------------------;
?WIN = 0?PLM = 1?NODATA = 0
.xlist include cmacros.inc .list
ifndef SEGNAME SEGNAME equ <_TEXT>endif
createSeg %SEGNAME, CodeSeg, word, public, CODE
sBegin CodeSeg .386 assumes cs,CodeSeg assumes ds,nothing assumes es,nothing
;---------------------------Public-Routine------------------------------;; muldiv32;; multiples two 32 bit values and then divides the result by a third; 32 bit value with full 64 bit presision;; lResult = (lNumber * lNumerator) / lDenominator;; Entry:; lNumber = number to multiply by nNumerator; lNumerator = number to multiply by nNumber; lDenominator = number to divide the multiplication result by.; ; Returns:; EAX and DX:AX = result of multiplication and division.; Error Returns:; none; Registers Preserved:; DS,ES,ESI,EDI;-----------------------------------------------------------------------; assumes ds,nothing assumes es,nothing
cProc muldiv32,<PUBLIC,FAR,PASCAL>,<>; ParmD ulNumber; ParmD ulNumerator; ParmD ulDenominatorcBegin pop edx ; return addr pop ebx ; ulDenominator pop ecx ; ulNumerator pop eax ; ulNumber push edx ; put back return addr
imul ecx ; edx:eax = (lNumber * lNumerator) idiv ebx ; eax = (lNumber * lNumerator) / lDenominator
shld edx,eax,16 ; move HIWORD(eax) to dxcEnd
sEnd CodeSeg
end
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