The following shows you which device families include which instructions.
PIC Microcontroller Instruction Set Comparison Matrix
http://www.piclist.com/techref/membe...RA4/PICISM.HTM
Mpasm Assembler User Guide
http://ww1.microchip.com/downloads/e...Doc/33014K.pdf
And this gives you a way to perform 8 and 16 bit compares, as well as an example of 16 bit subtraction, using assembly (in case you need it for ASM interrupts).
http://www.piclist.com/tecHREF/microchip/compcon.htm
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