flat assembler
Message board for the users of flat assembler.

Index > Main > x64 is not truly a 64bit procesor

Goto page Previous  1, 2
Author
Thread Post new topic Reply to topic
revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17478
Location: In your JS exploiting you and your system
revolution
JohnFound wrote:
Well, my definition: The bit-ness of the CPU is equal to the maximal bit-ness of the source data for "and" instruction. (available on all known CPUs). Very Happy
So you are also choosing the ALU width. I agree.
Post 17 Sep 2012, 00:26
View user's profile Send private message Visit poster's website Reply with quote
Feryno



Joined: 23 Mar 2005
Posts: 454
Location: Czech republic, Slovak republic
Feryno
nop wrote:
x64 is not truly a 64bit procesor Sad

yes and I'm guessing the feature expansion for full 64 bit will be here:
EFER.LMA=1, CS.L=1, CS.D=1
currently the D bit must be 0 (partial 64 bit mode mixed with 32 bits old age
heritage)

from manuals:
Quote:

If CS.L = 1 and IA-32e mode is active, the only valid setting is CS.D = 0. This setting indicates a default
operand size of 32 bits and a default address size of 64 bits. The CS.L = 1 and CS.D = 1 bit combination is
reserved for future use and a #GP fault will be generated on an attempt to use a code segment with these
bits set in IA-32e mode
Post 17 Sep 2012, 08:33
View user's profile Send private message Visit poster's website ICQ Number Reply with quote
nop



Joined: 01 Sep 2008
Posts: 165
Location: right here left there
nop
i did not start this silly tread Evil or Very Mad Evil or Very Mad Evil or Very Mad some mod did it for fun Evil or Very Mad i suspect revolution and he cut out this coment
revolution wrote:
The x86 encoding mechanism for immediate values only allows 32-bit signed values with ADD in 64-bit mode.
he knows the true answer but he just likes to argue Razz
Post 17 Sep 2012, 15:40
View user's profile Send private message Reply with quote
revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 17478
Location: In your JS exploiting you and your system
revolution
nop wrote:
i did not start this silly tread Evil or Very Mad Evil or Very Mad Evil or Very Mad some mod did it for fun Evil or Very Mad i suspect revolution and he cut out this coment
revolution wrote:
The x86 encoding mechanism for immediate values only allows 32-bit signed values with ADD in 64-bit mode.
he knows the true answer but he ...
It might have been me but the 'he' thing confused me. Are you sure I am a 'he'?
nop wrote:
... just likes to argue Razz
No I don't Wink
Post 17 Sep 2012, 15:51
View user's profile Send private message Visit poster's website Reply with quote
cod3b453



Joined: 25 Aug 2004
Posts: 619
cod3b453
I would say the size of the GPRs; ALUs are obviously tied to this but the likes of carry/upper and lower product/remainder don't exist in every architecture.
Post 17 Sep 2012, 17:35
View user's profile Send private message Reply with quote
nop



Joined: 01 Sep 2008
Posts: 165
Location: right here left there
nop
the starter of this silly thred who also invented the silly title shud define what he or she or it means by the silly term bit-ness Razz
Post 19 Sep 2012, 16:24
View user's profile Send private message Reply with quote
nop



Joined: 01 Sep 2008
Posts: 165
Location: right here left there
nop
revolution wrote:
nop wrote:
i did not start this silly tread Evil or Very Mad Evil or Very Mad Evil or Very Mad some mod did it for fun Evil or Very Mad i suspect revolution and he cut out this coment
revolution wrote:
The x86 encoding mechanism for immediate values only allows 32-bit signed values with ADD in 64-bit mode.
It might have been me
@revolution i am still waiting for you to please fix this thread with its silly title that you started but you made it look like it was me and it makes me angry Evil or Very Mad
Post 04 Oct 2012, 16:56
View user's profile Send private message Reply with quote
Display posts from previous:
Post new topic Reply to topic

Jump to:  
Goto page Previous  1, 2

< Last Thread | Next Thread >
Forum Rules:
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Copyright © 1999-2020, Tomasz Grysztar. Also on YouTube, Twitter.

Website powered by rwasa.