From:	"Salvador Eduardo Tropea (SET)" <salvador AT inti DOT edu DOT ar>
To:	Sengan DOT Short AT durham DOT ac DOT uk, djgpp AT delorie DOT com
Subject:	Re: Assembly
Date:	Thu, 20 Jun 1996 17:32:31 +0300 (GMT)
Message-ID:	<9606201732.aa02162@ailin.inti.edu.ar>

Hi all, here SET from Argentine:

>> > > The code is "shrd edx, eax, 16".  I don't know that much
>> 
>> I believe he's trying the upper 16 bits of one register into the lower
>> 16 bits (having the rest of the bits shifting along with it)
>> of the second register..   I think this is a 386 instruction...

>Yes, it is. I'm not convinced that gas supports all 386/486 instructions.
>Am I right on this score? (the info pages don't provide a listing of those
>it copes with AFAIK)

I don't know if GAS suports SHRD but you can put the values inside the code:

from the i486 manual:

---------------------------------
SHLD = Shift Left Double  TTT=100
SHRD = Shift Right Double TTT=101
---------------------------------

register with immediate  [00001111][10TTT100][11 reg2 reg1][imm 8 bits] 
(takes 2 cycles)

In a 32 bits segment is:
000 = EAX
010 = EDX
 
I supose that reg1 is the first (I could be wrong) then the sequence is:
[00001111][10101100][11010000][00010000]
   0x0F     0xAC       0xD0      0x10

then i supose that you can put:

        .db 0x0F,0xAC,0xD0,0x10

instead of "shrd edx,eax,16"

bye SET

********************************************************************************
Salvador Eduardo Tropea (SET) - salvador AT inti DOT edu DOT ar
Work: INTI (National Institute of Industrial Technology) Sector: ICE 
(Electronic Control & Instrumentation)
Post (Home): Curapaligue 2124 - Caseros (1678)- Buenos Aires - Argentina 

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