Hi, I am working on a new port to a target which supports pre-dec and post-inc addressing modes. I was told that the auto-increment/decrement optimizations aren't all that good in GCC. But AVR has it working. I would like to know everything about implementing pre-dec/post-inc in a machine description. I looked over AVR backend but I did not understand some things like: 'p' and 'r' are codes introduced to mean that operands should be pre-dec or post-inc ___________________________________________________________ ;; p POST_INC or PRE_DEC address as a pointer (X, Y, Z) ;; r POST_INC or PRE_DEC address as a register (r26, r28, r30) ___________________________________________________________ but they seem to be never used. Please help. Regards. Florent
