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Re: [Qemu-ppc] [Qemu-devel] [PATCH] PPC: Introduce 32bit only cmp ops

From: Aurelien Jarno
Subject: Re: [Qemu-ppc] [Qemu-devel] [PATCH] PPC: Introduce 32bit only cmp ops
Date: Wed, 8 May 2013 13:16:53 +0200
User-agent: Mutt/1.5.21 (2010-09-15)

On Wed, May 08, 2013 at 12:34:26PM +0200, Torbjorn Granlund wrote:
> Aurelien Jarno <address@hidden> 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
address@hidden                 http://www.aurel32.net

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