From: malc <av1474@comtv.ru>
To: Torbjorn Granlund <tg@gmplib.org>
Cc: qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] Bug report about x86 'bt' insn
Date: Sat, 6 Nov 2010 21:55:26 +0300 (MSK) [thread overview]
Message-ID: <alpine.LNX.2.00.1011062154060.1773@linmac> (raw)
In-Reply-To: <86wroqmhso.fsf@shell.gmplib.org>
On Sat, 6 Nov 2010, Torbjorn Granlund wrote:
> malc <av1474@comtv.ru> 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:av1474@comtv.ru
next prev parent reply other threads:[~2010-11-06 18:55 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-06 14:42 [Qemu-devel] Bug report about x86 'bt' insn Torbjorn Granlund
2010-11-06 17:16 ` malc
2010-11-06 18:24 ` Torbjorn Granlund
2010-11-06 18:55 ` malc [this message]
2010-11-06 18:59 ` Nathan Froyd
2010-11-06 19:22 ` malc
2010-11-06 19:25 ` malc
2010-11-10 14:15 ` Torbjorn Granlund
2010-11-10 14:19 ` malc
2010-11-10 14:38 ` Torbjorn Granlund
2010-11-10 15:08 ` malc
2010-11-10 15:45 ` malc
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