roy rosen <roy.1ro...@gmail.com> writes: >> You build a RECORD_TYPE holding the fields you want to return. You >> define the appropriate builtin functions to return that record type. > > How is that done? using define_insn? How do I tell it to return a struct? > Is there an example I can look at?
A RECORD_TYPE is what gcc generates when you define a struct in your source code. For an example of a backend building a struct, see, e.g., ix86_build_builtin_va_list_abi. When you define your builtin functions in TARGET_INIT_BUILTINS you specify the argument types and the return type, typically by building a FUNCTION_TYPE and passing it to add_builtin_function. To define a builtin which returns a struct, just arrange for the return type of the FUNCTION_TYPE that you pass to add_builtin_function be the RECORD_TYPE that you built. Ian
