On 03/09/2011 06:11, Philipp Klaus Krause wrote: > > Would you be interested in seeing support for some so-called > undocumented Z80 instructions in sdcc? This would be available via a > command-line switch, that would allow sdcc to generate the following: > > adc a, ir > add a, ir > and a, ir > cp a, ir > inc ir > ld ir, ir' > ld ir, n > ld ir, r > ld r, ir > or a, ir > sbc a, ir > sub a, ir > xor a, ir > > Where ir/ir' is iyh or iyl, and r is a, b, c, d or e, and n is an 8-bit > immediate. > > For targets that support them this could result in slightly smaller and > faster code since it allows more flexible use of iy. > > AFAIK most softcore implementation of the Z80 officially support them, > and they just work on most other implementations as well, even where > this is not documented. >
- My personal opinion is that Z80 undocumented instructions must not be used and supported, since no one can certify their behaviour. Claude ------------------------------------------------------------------------------ Special Offer -- Download ArcSight Logger for FREE! Finally, a world-class log management solution at an even better price-free! And you'll get a free "Love Thy Logs" t-shirt when you download Logger. Secure your free ArcSight Logger TODAY! http://p.sf.net/sfu/arcsisghtdev2dev _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
