On 27.03.2013 22:28, Masur Jonathan wrote: > Hello, > it really sounds incredible SDCC can do this automatically ! > What if you call a function that itself call a function that will affect > the bank switching ? Can SDCC detect such cases and do all the > bank-switching automatically ?
Well, sdcc does not do real interprocedural optimization. So unless the function is inlined, sdcc will assume that the state of BBR is unknown after the call. This could result in a write to BBR that is not necessary (but the function body might be in a different .rel file, so sdcc cannot know if the called function might change BBR; the only safe way is to assume that the state of BBR is unknown after the call). > This really sounds incredible. If SDCC can do all this, it's one more > reason to port it to the 6502 ! > > PS : What about interrupts that touches bank-switching ? You should either not access banked memory in the handler, or put code to save and restore BBR upon interrupts in your crt0.rel. Philipp ------------------------------------------------------------------------------ Own the Future-Intel® Level Up Game Demo Contest 2013 Rise to greatness in Intel's independent game demo contest. Compete for recognition, cash, and the chance to get your game on Steam. $5K grand prize plus 10 genre and skill prizes. Submit your demo by 6/6/13. http://p.sf.net/sfu/intel_levelupd2d _______________________________________________ Sdcc-user mailing list Sdcc-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/sdcc-user
