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