I updated my answer on SO, with a deftype-based one that gives me an additional 30% boost.
On Tue, Feb 19, 2013 at 6:38 PM, Geo <ggrigor...@gmail.com> wrote: > What about the call to .equals? > > > On Tuesday, February 19, 2013 12:20:28 PM UTC-5, Marko Topolnik wrote: >> >> The difference between String[] and Object[] is that a member of the >> former doesn't need a checked cast to String, but the latter does need one. >> In the code under consideration, however, nothing specific to String is >> used, so even in the Java code you can freely replace String[] with >> Object[] and everything still works. >> >> If, on the other hand, you needed to invoke say *substring*, you'd see a >> small penalty due to the checked cast operation. >> >> On Tuesday, February 19, 2013 5:52:31 PM UTC+1, Andy Fingerhut wrote: >>> >>> ^objects is a Clojure synonym for ^"[Ljava.lang.Object;". Note that >>> there are such synonyms for only a few Java types, not everything, e.g. >>> there is no ^strings. >>> >>> What you are hinting is that a1 and a2 are Java arrays of objects. I >>> think this might speed up (aget a1 i) expressions, since it is known that >>> a1 is an array of objects, but I'm not sure about that. I believe "under >>> the hood" in the JVM all arrays of Objects are treated the same, regardless >>> of whether those Objects are String, Integer, java.awt.Color, etc. >>> >>> Andy >>> >>> On Feb 19, 2013, at 8:46 AM, Geo wrote: >>> >>> One thing I don't get is that switching the type hints from >>> >>> [#^"[Ljava.lang.String;" a1 #^"[Ljava.lang.String;" a2] >>> >>> to [^objects a1 ^objects a2] didn't seem to have any negative impact on >>> performance. Can anyone explain why hinting ^objects is just as good as >>> specifying that it's an array of Strings? What are you hinting with >>> ^objects that Clojure doesn't already know? >>> >>> -- > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- On Clojure http://clj-me.cgrand.net/ Clojure Programming http://clojurebook.com Training, Consulting & Contracting http://lambdanext.eu/ -- -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
