Re: [Qemu-devel] Bug report about x86 'bt' insn

[malc]

On Sat, 6 Nov 2010, Nathan Froyd wrote:

> On Sat, Nov 06, 2010 at 07:24:39PM +0100, Torbjorn Granlund wrote:
> > malc <address@hidden> writes:
> > 
> >   ZF is undefined according to AMD's 24594.pdf page 69.
> >   
> > Ah, you're right.  It seems that all existing x86 implementations leave
> > ZF alone, though.  (I am not arguing that qeum is broken, the bug is in
> > my code.)
> 
> FWIW, the Intel manuals (253666, June 2010) state that the ZF flag is
> unaffected, not just undefined.

(3-94 Vol. 2A BT it Test)

Flags Affected
The CF flag contains the value of the selected bit. The OF, SF, ZF, AF, 
and PF flags are undefined.

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