Re: [Sbcl-help] Reduce compiler macro ?

[Rupert S. <rsw...@gm...>]

Jeffrey Cunningham <je...@jk...> writes:
> On 07/30/2012 12:47 PM, Rupert Swarbrick wrote:
>>
>> Ah, OK, I think I understand. Presumably it would be possible for SBCL
>> to notice that (reduce f seq) calls f with only two arguments and thus
>> replace (reduce #'f seq) with the two-argument version? (I'm not
>> necessarily arguing that this optimisation is easy to implement / worth
>> implementing - I just want to check it makes sense)
>>
>> Rupert
>>
>
> But then the test for the 2-argument case would involve additional
> overhead affecting both cases. So it wouldn't be as fast as '+' alone
> and would slow down the > 2 case as well.
>
> Jeff

But you would be checking for it when you compiled the form (reduce #'+
seq), not when #'+ was called, no?

Rupert