To: djgpp AT delorie DOT com
Subject: Re: 32 bit registers
Message-ID: <19961226.230751.4975.5.chambersb@juno.com>
References: <59cs4f$58k AT nr1 DOT ottawa DOT istar DOT net> <19961224 DOT 142048 DOT 4751 DOT 1 DOT chambersb AT juno DOT com>
From: chambersb AT juno DOT com (Benjamin D Chambers)
Date: Thu, 26 Dec 1996 02:03:31 EST


On Wed, 25 Dec 1996 18:27:46 -0700 Jens Vaasjo
<jvaasjo AT gpu DOT srv DOT ualberta DOT ca> writes:
>Benjamin D Chambers wrote:
>> 
>> Thanx to everyone who suggested methods of swapping words in a 
>dword...
>> The catch is, I didn't really need to know :)
>> My original question was if there were a way to load a word into the 
>high
>> word of a register.
>> 
>> Thanx anyways, though, just proves charity lives on :)
>> 
>> ..Chambers
>
>I think u just load it into the low word and shll (shift left it).
>let say u wanted to put 5 in the high byte of ecx.
>
>asm("movl $5,%cx\n
>     shll $16,%ecx\n
>    "
>    :
>    :
>    :"ecx","cc"
>    );
>
>
>Jens.
>
Perhaps I didn't make myself clear:
I already know every trick mentioned :)
I am asking about loading a word DIRECTLY into the high word.
As in, no shifts, no and's, no or's, nothing.
Just a simple move.
I already knew everything everyone said - what I wanted to know was
whether the high word could be targeted directly.

Sorry for the redundency, some people seem to think I still need to know
a nifty trick involving two or three op's.


Thanx anyways, though.

...Chambers