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Re: [Qemu-devel] Bug report about x86 'bt' insn
From: |
malc |
Subject: |
Re: [Qemu-devel] Bug report about x86 'bt' insn |
Date: |
Sat, 6 Nov 2010 22:25:16 +0300 (MSK) |
User-agent: |
Alpine 2.00 (LNX 1167 2008-08-23) |
On Sat, 6 Nov 2010, malc wrote:
> 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.
>
And this one was March 2009 (conveniently having the same file name
253666), the September 2010 issue reads differently:
Flags Affected
The CF flag contains the value of the selected bit. The ZF flag is
unaffected. The OF, SF, AF, and PF flags are undefined.
--
mailto:address@hidden
- [Qemu-devel] Bug report about x86 'bt' insn, Torbjorn Granlund, 2010/11/06
- Re: [Qemu-devel] Bug report about x86 'bt' insn, malc, 2010/11/06
- Re: [Qemu-devel] Bug report about x86 'bt' insn, Torbjorn Granlund, 2010/11/06
- Re: [Qemu-devel] Bug report about x86 'bt' insn, malc, 2010/11/06
- Re: [Qemu-devel] Bug report about x86 'bt' insn, Nathan Froyd, 2010/11/06
- Re: [Qemu-devel] Bug report about x86 'bt' insn, malc, 2010/11/06
- Re: [Qemu-devel] Bug report about x86 'bt' insn,
malc <=
- Re: [Qemu-devel] Bug report about x86 'bt' insn, Torbjorn Granlund, 2010/11/10
- Re: [Qemu-devel] Bug report about x86 'bt' insn, malc, 2010/11/10
- Re: [Qemu-devel] Bug report about x86 'bt' insn, Torbjorn Granlund, 2010/11/10
- Re: [Qemu-devel] Bug report about x86 'bt' insn, malc, 2010/11/10
- Re: [Qemu-devel] Bug report about x86 'bt' insn, malc, 2010/11/10