From: Richard Henderson <rth@twiddle.net>
To: Bug 600589 <600589@bugs.launchpad.net>
Cc: Vic3Dexe <vic3dexe@gmail.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [Bug 600589] [NEW] xchg r8,rax treated as nop
Date: Thu, 01 Jul 2010 09:17:10 -0700 [thread overview]
Message-ID: <4C2CBF86.4060100@twiddle.net> (raw)
In-Reply-To: <20100701120434.6052.96178.malonedeb@potassium.ubuntu.com>
On 07/01/2010 05:04 AM, Vic3Dexe wrote:
> Public bug reported:
>
> xchg r8,rax (49h 90h) executed as nop (90h) in long mode, in other words
> REX not used.
>
> qemu 0.12.4, host Win 7 x64, running qemu-system-x86_64.exe.
>
> ** Affects: qemu
> Importance: Undecided
> Status: New
>
Verified. Test case for x86_64-linux-user:
.globl main
.type main, @function
main:
movl $0, %r8d
movl $1, %eax
xchgq %r8, %rax
ret
Expected result is exit status 0.
r~
next prev parent reply other threads:[~2010-07-01 16:36 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-01 12:04 [Qemu-devel] [Bug 600589] [NEW] xchg r8,rax treated as nop Vic3Dexe
2010-07-01 16:17 ` Richard Henderson [this message]
2010-07-01 16:42 ` [Qemu-devel] [PATCH] target-i386: Fix xchg rax,r8 Richard Henderson
2010-07-01 21:52 ` Aurelien Jarno
2010-07-01 16:43 ` [Qemu-devel] [Bug 600589] [NEW] xchg r8,rax treated as nop malc
2010-07-02 19:13 ` vic3dexe
2010-07-02 20:08 ` Richard Henderson
2010-07-06 13:00 ` [Qemu-devel] [Bug 600589] " Jes Sorensen
2011-02-20 17:13 ` Aurelien Jarno
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