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Re: [Qemu-ppc] [Qemu-devel] [PATCH] PPC: Introduce 32bit only cmp ops
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From: |
Aurelien Jarno |
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Subject: |
Re: [Qemu-ppc] [Qemu-devel] [PATCH] PPC: Introduce 32bit only cmp ops |
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Date: |
Wed, 8 May 2013 13:16:53 +0200 |
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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