Jim, First, thanks a lot for your comments. > It current sources, you want to define a > $target/constraints.md file that has a (define_contraint "I" ...) pattern. I have been looking at other targets, and they seem to use the CONST_OK_FOR_LETTER_P macro for this purpose. Is the define_constraint equivalent to what the macro CONST_OK_FOR _LETTER_P used to stand for? I am trying to understand is define_constraint replaces this macro's functionality. Your comment confirms my suspicion: > Most gcc internals stuff like this is not well documented. > You just try it, and if it works fine, if > it doesn't, then change it. -Omar
