lkml.org 
[lkml]   [2000]   [Nov]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: Where is it written?
Date
Followup to:  <20001112132328.C2366@athlon.random>
By author: Andrea Arcangeli <andrea@suse.de>
In newsgroup: linux.dev.kernel
>
> I think it doesn't worth to break binary compatilibity at this late stage.
>
> > design such.) One issue: ideally you want to use 64-bit regs on AMD
> > Hammer for long longs, but then you leave out all legacy x68s. :(
>
> We can't in compatibilty mode because the rex regs are available _only_ in
> 64bit mode and even assuming the hardware would support that I would not
> recommend that since as you said that binary would not run anymore on any other
> x86 so causing pain. Recompiling a program with native x86-64 gcc 64bit (that
> uses the 64bit ABI) is the right way to go in that case (64bit mode uses 1
> 64bit register for long long as all other 64bit architectures of course).
>

Well, you *could* run REX32, but REX32 is not x86 (x86 code doesn't
run in REX32 mode, and REX32 code doesn't run on an x86.)

-hpa
--
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:45    [W:0.080 / U:0.236 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site