You probably mean "xorwf ..." for the 3rd statement in the first
example.


----- Original Message -----
From: "Jon Baker" <jon@HAYSEED.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, March 14, 2002 7:28 PM
Subject: [PIC]: xor trick


> I'm sure everybody knows the xor trick to swap W and a F register:
> xorwf reg,f
> xorwf reg,w
> xorlw reg,f
>
> to swap two file registers without using a temp register and without
> destroying to contents of W
> you can swap F1 with W, F2 with W and F1 with W which uses 9 instructions.
> Can the same
> be done in fewer instructions?
>
> Jon Baker
>
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