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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 22:22:22 +0300 (MSK) |
User-agent: |
Alpine 2.00 (LNX 1167 2008-08-23) |
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.
--
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 <=
- Re: [Qemu-devel] Bug report about x86 'bt' insn, malc, 2010/11/06
- Re: [Qemu-devel] Bug report about x86 'bt' insn, Torbjorn Granlund, 2010/11/10
- 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