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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 21:55:26 +0300 (MSK) |
User-agent: |
Alpine 2.00 (LNX 1167 2008-08-23) |
On Sat, 6 Nov 2010, 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.)
>
> I apologize for the false alarm!
Well, it's not as false as one would imagine, since QEMU sets lazy
eflags evaluation function to SAR[BWL] in BT case which is not so
good from performance standpoint.
--
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 <=
- 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, 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