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From: apn@gilbbs.UUCP (Alex Novikis)
Newsgroups: net.micro.pc
Subject: Re: 8087 opcodes needed
Message-ID: <144@gilbbs.UUCP>
Date: Mon, 7-Apr-86 01:49:10 EST
Article-I.D.: gilbbs.144
Posted: Mon Apr  7 01:49:10 1986
Date-Received: Wed, 9-Apr-86 23:39:50 EST
References: <292@cernvax.UUCP>
Organization: Gil's Place, Santa Rosa CA
Lines: 77
Summary: 8087: FLD and FSTP

In article <292@cernvax.UUCP>, mnl@cernvax.UUCP (mnl) writes:
> subject: 8087 opcodes needed
> Newsgroups: net.micro.pc
> 
> I'm trying to write a pair of routines to convert 64-bit floating
> point (which is what our Modula-2 compiler uses) to and from 32-bit
> floating point.  Unfortunately, I can't seem to find any list of
> 8087 opcodes, and Masm doesn't seem to know about the 8087. What I
> need are the opcodes for:
> 
> 	FLD     ;32-bit and 64-bit, i.e. DWORD and QWORD
> 	FSTP    ;       as above
> 
> Thanks in advance
> -- 
> mnl@cernvax.bitnet or ...!seismo!mcvax!cernvax!mnl
> "This function is occasionally useful as the arguement to a function
> which requires a function as an arguement."  Guy Steele, Jr.


    Here are the macros for FLD and FSTP...


codemacro       FLD     src:Mb
        segfix  src
        db      0d9h
        modrm   0,src
endm

codemacro       FLD     src:Mw
        segfix  src
        db      0ddh
        modrm   0,src
endm

codemacro       FLD     src:Db(0,7)
        db      0d9h
        dbit    5(18h),3(src(0))
endm

codemacro       FSTP    dst:Mb
        segfix  dst
        db      0d9h
        modrm   3,dst
endm

codemacro       FSTP    dst:Mw
        segfix  dst
        db      0ddh
        modrm   3,dst
endm

codemacro       FSTP    dst:Db(0,7)
        db      0ddh
        dbit    5(1bh),3(dst(0))
endm




---------------------------------------------------------------


Hope these may be of some use..,


-- 
==============================================

    Alex Paul Novickis		(707) 575 8672
    Fulcrum Computers, Inc.	1635 Ditty Ave. Santa Rosa, CA 95401-2636

    {ihnp4, dual}!ptsfa!gilbbs!apn

"Almost doesn't count...      but it almost does"

DISCLAIMER:  The opinions contained herein may not be of anyone that I know.