Leaked source code of windows server 2003
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page ,132 title 87ftol - truncate TOS to 32-bit integer;*** ;87ftol.asm - truncate TOS to 32-bit integer;; Copyright (c) 1985-2001, Microsoft Corporation. All rights reserved.;;Purpose:;;Revision History:;; 07/16/85 Greg Whitten; save BX and CX for sloppy code generator; 10/15/86 Greg Whitten; in-line instructions rather than call _fpmath; 08/24/87 Barry McCord; expand the functionality of _ftol to handle; unsigned long by using "fistp qword ptr"; 11/24/87 Barry McCord; added _loadds under ifdef DLL;; 08/26/88 Bill Johnston; 386 version;;*******************************************************************************
.xlist include cruntime.inc.list
CODESEG
public _ftol_ftol proc
local oldcw:word local newcw:word local intval:qword
fstcw [oldcw] ; get control word fwait ; synchronize
mov ax, [oldcw] ; round mode saved or ah, 0ch ; set chop rounding mode mov [newcw], ax ; back to memory
fldcw [newcw] ; reset rounding fistp qword ptr [intval] ; store chopped integer fldcw [oldcw] ; restore rounding
mov eax, dword ptr [intval] mov edx, dword ptr [intval+4]
ret_ftol endp
end
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