Dobes <bdo...@udel.edu> writes: > I am working on a port to an architecture with some strict rules. The > restriction that I am unable to figure out how to enforce is a base register > that is allowed in the destination operand, but not in a source operand. > For example, this would be allowed "add 4($1), $8, $9", but this would not > be allowed "add $8, 4($1), $9" because $1 can only be used a base register > for the destination operand. Is there any way to get that kind of > information in GO_IF_LEGITIMATE_ADDRESS or can you think of some other way > to handle this? Anyone know of a port with something similar that I could > look at? Thanks.
This kind of restriction would normally be handled via appropriate use of register classes in the define_insn patterns. You will also want to make sure that BASE_REG_CLASS and REGNO_OK_FOR_BASE_P are definedly correctly. Ian
