From: Denis Vlasenko <vda@ilport.com.ua>
To: <cutaway@bellsouth.net>, <linux-kernel@vger.kernel.org>
Subject: Re: 387 emulator hack - mutant AAD trick - any objections?
Date: Fri, 27 May 2005 12:35:41 +0300
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On Friday 27 May 2005 10:44, cutaway@bellsouth.net wrote:
> Brain fade...example should be:
> 
> 1) Start with AX = 0x0023
> 2) Execute AAM instruction
> 3) Now AX = 0x0305 (unpacked BCD)
> 4) Execute base 16 AAD instruction
> 5) Now AX = 0x0035 (packed BCD)

Intel syntax:

shl ah,4
or al,ah
mov ah,0  (if needed)

No need to use AAD16, it is 
a) doesnt work on some obscure ancient NEC x86 clones IIRC
b) is microcoded (slow)
--
vda

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