Jean Christophe Beyler <jean.christophe.bey...@gmail.com> writes: > I have been also been looking into how to generate a function call for > certain operations. I've looked at various other targets for a similar > problem/solution but have not seen anything. On my target > architecture, we have certain optimized versions of the multiplication > for example. > > I wanted to replace certain mutliplications with a function call. The > solution I found was to do perform a FAIL on the define_expand of the > multiplication for these cases. This forces the compiler to generate a > function call to __multdi3. > > I then go in the define_expand of the function call and check the > symbol_ref to see what function is called. I can then modify the call > at that point. > > My question is: is this a good approach or is there another solution > that you would use?
I think that what you describe will work. I would probably generate a call to a builtin function in the define_expand. Look for the way targets use init_builtins and expand_builtin. Normally expand_builtin expands to some target-specific RTL, but it can expand to a function call too. Ian
