> Just for me, if the code is backward compatible, it should be no problem to > support enhanced architecture chips. Or did I miss something? What are > drawbacks of supporting these devices?
The enhanced devices use 14-bit instructions but address more memory banks -- and for this they use different mechanisms: regular 14-bit devices have data bank bits in STATUS, the enhanced devices do not use any bank bits from STATUS but introduce a 16-bit-like register for data bank selection. This breaks implicit compiler assumptions, as SDCC occasionally "optimizes" BANKSEL directives (which typically expand to 2 bit set/clear instructions on STATUS) to a single bit set/clear instruction when the other bit is known to remain constant. As the "support'" of the enhanced devices is thus pretty broken, I would have removed it entirely in order not to raise false hopes -- that's pretty much it. Raphael ------------------------------------------------------------------------------ The demand for IT networking professionals continues to grow, and the demand for specialized networking skills is growing even more rapidly. Take a complimentary Learning@Cisco Self-Assessment and learn about Cisco certifications, training, and career opportunities. http://p.sf.net/sfu/cisco-dev2dev _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
