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