From: Aurelien Jarno <aurelien@aurel32.net>
To: Torbjorn Granlund <tg@gmplib.org>
Cc: qemu-devel@nongnu.org, qemu-ppc@nongnu.org,
Alexander Graf <agraf@suse.de>,
Richard Henderson <rth@twiddle.net>
Subject: Re: [Qemu-devel] [PATCH] PPC: Introduce 32bit only cmp ops
Date: Wed, 8 May 2013 13:16:53 +0200 [thread overview]
Message-ID: <20130508111652.GM4613@ohm.aurel32.net> (raw)
In-Reply-To: <861u9hoj4d.fsf@shell.gmplib.org>
On Wed, May 08, 2013 at 12:34:26PM +0200, Torbjorn Granlund wrote:
> Aurelien Jarno <aurelien@aurel32.net> writes:
>
> You have to declare the L bit as invalid, so that trying to execute a
> 64-bit cmp* instruction on a 32-bit CPU causes an invalid instruction
> exception.
>
> Don't people read what I write?
>
Quoting the "IBM PowerPC Microprocessor Family: The Programming
Environments Manual for 32 and 64-bit Microprocessors":
| Note: In 32-bit implementations, if L = 1 the instruction form is invalid.
--
Aurelien Jarno GPG: 1024D/F1BCDB73
aurelien@aurel32.net http://www.aurel32.net
prev parent reply other threads:[~2013-05-08 11:17 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-08 10:06 [Qemu-devel] [PATCH] PPC: Fix cmp on 32bit only targets Alexander Graf
2013-05-08 10:06 ` [Qemu-devel] [PATCH] PPC: Add 32bit instruction flag Alexander Graf
2013-05-08 10:06 ` [Qemu-devel] [PATCH] PPC: Introduce 32bit only cmp ops Alexander Graf
2013-05-08 10:29 ` Aurelien Jarno
2013-05-08 10:33 ` Alexander Graf
2013-05-08 10:34 ` Torbjorn Granlund
2013-05-08 10:38 ` Alexander Graf
2013-05-08 11:16 ` Aurelien Jarno [this message]
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