On Sep 8, 2010, at 05:39, robin wrote:
> From: "Tony Harminc"
> Sent: Wednesday, 8 September 2010 9:20 AM
>
>> It's also how "classic" (base & displacement) addressing arithmetic,
>> which we all know deals only with unsigned values, can subtract.
>
> Classic base-displacement atithmetic is always addition,
> never subtraction.
Ahem.
LH R1,=H'-4096'
USING -4096,R1
LA R2,*
LA R3,-4(,R2)
What does R3 now address?
This caused a great deal of debate on this list several years
ago. Very few contributors got it right.
-- gil
