mirror of https://github.com/tongzx/nt5src
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
58 lines
1.1 KiB
58 lines
1.1 KiB
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
|