Hello All (& Ian) The Go language has functions which can give more than one result.
In my MELT experience, most multiple-results function calls have only two results. Giving 3 results is very rare, and giving more than 3 results is really exceptionnal (probably as exceptionnal as functions with more than 6 arguments). >From what I learned from the Go tutorial at the GCC summit, The Go language >also have several idioms with two results. >From what I know of the AMD64 ABI, (but I might be false), functions are only >supposed to return one result in a register (rax...). I would imagine that most (& perhaps all) GCC target architectures have at least two available registers to return values. So I would imagine that defining a (e.g. Go specific) binary convention where a dual-result functions gives the secondary result in another register (eg rbx on AMD64) would make sense, and be quite quick, and be reasonably easy to implement. However, I don't know much about GCC backends. Does the Go language define a specific ABI convention for returning two values from a function thru registers? If yes, how does GCC implement it? Or is it some future work? Cheers. -- Basile STARYNKEVITCH http://starynkevitch.net/Basile/ email: basile<at>starynkevitch<dot>net mobile: +33 6 8501 2359 8, rue de la Faiencerie, 92340 Bourg La Reine, France *** opinions {are only mine, sont seulement les miennes} ***
