ON 20070624@11:16:48 PM at page:
http://www.piclist.com/microchip/math/mul/16x8-d.htm#39257.3471064815
James Newton[JMN-EFP-786] published post 39257.3471064815

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The modification suggested by Jordi Agust causes the multiply routine to fail if the AA register set is zero. The zero flag would only be valid if the increment above it was used. In the case of AA being zero, the zero flag is still set from the previous line "addwf   CC+2,f", meaning CC+0 will get incremented, returning a non-zero result.
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ON 20070626@10:47:43 AM at page:
http://www.piclist.com/microchip/math/mul/16x8-d.htm#39258.3709375
James Newton[JMN-EFP-786] published post 39258.3709375

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The problem is worse than the previous comment suggested. Only AA+1 (the LSByte) has to be zero for the routine to fail, which is a much bigger problem than if the whole AA register were zero
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