Setjem Setjem wrote: > Hi, I'am trying to write a backend for my own target system. The target has > two pointer registers but only one of them can be used to read data from > memory and the other one to write data into memory. What will happen if a frame pointer is needed? Is GCC supposed to work with such a limited hardware at all? > How could i tell the compiler to use the correct register for the respective > operation? > > I have tried to copy the address into the correct register in the > define_expand "mov<mode>", but this seems to confuse the compiler and not > working always. I also tried to describe it in the target hook > TARGET_LEGITIMATE_ADDRESS_P, but there i have no idea how to find out which > operation is performed (write/read). > > Thanks in advance. > > best regards, Andreas
